Siemens SIMATIC Step 7 Programmer's Handbook

Siemens SIMATIC Step 7 Programmer's Handbook

http:/ /www.pl cdev.com/ book/export/html /373


This handbook is a collection of programming overviews, notes, helps, cheat sheets and whatever that can help you (and me) program a Siemens PLC.

If you have experience e xperience with Siemens Siemens then please contribute contribute..

Siemens Website Quick Links This is a listing of tutorials and manuals found on the Siemens automation website that will get you started on the SIMATIC SIMATIC Step Step 7 software for S7-300 S7-300 and S7-400 systems. From From a new ne w users perspective I’ve only heard disparaging comments about finding the right information on the Siemens’ website. I have to agree. Its information overload at it’s best. There’s a lot of different stuff there thrown together and found in different spots with with very long URL addresses to add to the confusio c onfusion. n. Have no fear. We’re here to help. So we’ll look at the essentials for your journey. journey. The software if you haven’t got it yet Getting a sense for the product line Where to start with the manuals Online training material Downloadable Downloadable Flash Flash tutorials t utorials Of course the best type of training of training is the hands on type but if that’s not a n option then you’ll need to start star t digging in.

Who’s got the Software? Software?



If you are just learning and can’t easily get the software then there are two options. 1. Order the demo CD which will will give give you a free fre e 30-day trial period. 2. Downl Download oad a free working copy of Step 7 Lite. Lite . There are differenc differences es between the regular regular version version of Step 7 and Step 7 Lite but for learning lea rning purposes you can go along way way with the free Lite L ite version.

First Things First The first thing I like to do with a new product is get get an a n overview of everything. Getting used to part numbers and product produc t groupings can go a long way with your comfort level. le vel. The best thing for this is the sales catalog (ST 70 – 2005). You can also order a hard copy.

Where to Start? Manuals, manuals, everyw everywhere! here! Once you install the Step 7 software there will will be a directory under the SIMATIC SIMATIC folder called ca lled Documentation that includes the most important important manuals. Hard copies can be ordered with number 6ES7810-4CA08-8BW1. 6ES7810-4CA08-8B W1. Here’s Here ’s how I would digest them. 1. Working with STEP 7 - This is a basic introduction to Step 7 which walks through an example of controlling engines. engines. While it’s not the complete picture it does ease you very well into the learning curve of the t he Step 7 software. 2. Programming with STEP 7 Manual - Here’s the fuller fuller manual for the t he programming programming interfa interface ce which is also the same as the online help accessed acc essed by pressed the F1 key. 3. Configuring Hardware and Communication Connections STEP 7 Manual - Everything Everyt hing to do with the Hardware Configurator. Configurator. 4. Statement List, List, Ladder Logic, Logic, and Function Block Diagram Reference Manuals - These manuals contain both the user’s user’ s guide guide and a nd the reference re ference description of the programming programming language language or representation repre sentation type. You only re quire one language language type for programming programming an S7-300/S7-400, S7-300/S7-400, but you can mix the languages languages within within a project, project, if required. If you’re more comfortable with Ladder Logic or Function Block Block Diag Diagram ram then start there but sooner or later you’ll have to become familiar with State Statement ment List. 5. System Software for S7-300 and S7-400 System and Standard Functions Reference Manual The S7 CPUs have integrated system functions and organization organization blocks included with their the ir operating system, which you can use when programming. This manual provides you with an overview of the system functions, functions, organization blocks, and loadable standard functions available in S7, S7, and detailed det ailed interface descriptions for their use in your programs. programs.

Training Material There’s There ’s gold gold in that website if you just do a little digging! digging! If you’re having ha ving a tough go with the manuals manua ls then you should definitely definitely download the training tr aining material material.. There’s a lot lot more screen shots and even a picture of a balding pudgy guy guy to point things out to you. What more could you want?

Flash Tutorials If you’re not the manual type (and even if you are) check out the Siemens Step 7 Flash tutorials. tutorials. These are very professionally professionally done with a nice sounding narrator narrat or to take t ake you through all the basics of the t he Step 7 software and hardware.

What's Next? Of all the starting starti ng places places to dig for more info I find the support section the best especially e specially if if you have a part number number or key word you can search on. Clicking on the Product Support link will will bring up up a tree tr ee on

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If you are just learning and can’t easily get the software then there are two options. 1. Order the demo CD which will will give give you a free fre e 30-day trial period. 2. Downl Download oad a free working copy of Step 7 Lite. Lite . There are differenc differences es between the regular regular version version of Step 7 and Step 7 Lite but for learning lea rning purposes you can go along way way with the free Lite L ite version.

First Things First The first thing I like to do with a new product is get get an a n overview of everything. Getting used to part numbers and product produc t groupings can go a long way with your comfort level. le vel. The best thing for this is the sales catalog (ST 70 – 2005). You can also order a hard copy.

Where to Start? Manuals, manuals, everyw everywhere! here! Once you install the Step 7 software there will will be a directory under the SIMATIC SIMATIC folder called ca lled Documentation that includes the most important important manuals. Hard copies can be ordered with number 6ES7810-4CA08-8BW1. 6ES7810-4CA08-8B W1. Here’s Here ’s how I would digest them. 1. Working with STEP 7 - This is a basic introduction to Step 7 which walks through an example of controlling engines. engines. While it’s not the complete picture it does ease you very well into the learning curve of the t he Step 7 software. 2. Programming with STEP 7 Manual - Here’s the fuller fuller manual for the t he programming programming interfa interface ce which is also the same as the online help accessed acc essed by pressed the F1 key. 3. Configuring Hardware and Communication Connections STEP 7 Manual - Everything Everyt hing to do with the Hardware Configurator. Configurator. 4. Statement List, List, Ladder Logic, Logic, and Function Block Diagram Reference Manuals - These manuals contain both the user’s user’ s guide guide and a nd the reference re ference description of the programming programming language language or representation repre sentation type. You only re quire one language language type for programming programming an S7-300/S7-400, S7-300/S7-400, but you can mix the languages languages within within a project, project, if required. If you’re more comfortable with Ladder Logic or Function Block Block Diag Diagram ram then start there but sooner or later you’ll have to become familiar with State Statement ment List. 5. System Software for S7-300 and S7-400 System and Standard Functions Reference Manual The S7 CPUs have integrated system functions and organization organization blocks included with their the ir operating system, which you can use when programming. This manual provides you with an overview of the system functions, functions, organization blocks, and loadable standard functions available in S7, S7, and detailed det ailed interface descriptions for their use in your programs. programs.

Training Material There’s There ’s gold gold in that website if you just do a little digging! digging! If you’re having ha ving a tough go with the manuals manua ls then you should definitely definitely download the training tr aining material material.. There’s a lot lot more screen shots and even a picture of a balding pudgy guy guy to point things out to you. What more could you want?

Flash Tutorials If you’re not the manual type (and even if you are) check out the Siemens Step 7 Flash tutorials. tutorials. These are very professionally professionally done with a nice sounding narrator narrat or to take t ake you through all the basics of the t he Step 7 software and hardware.

What's Next? Of all the starting starti ng places places to dig for more info I find the support section the best especially e specially if if you have a part number number or key word you can search on. Clicking on the Product Support link will will bring up up a tree tr ee on

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the left hand side that can be expanded down to the product of your affection. affec tion. Good luck luck and happy hunting.

Review of Siemens SIMATIC Step S tep 7 Lite Programming Softwar Sof twaree “Great taste. Less filling.”

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When one hears the words “Lite” and software you tend to think of software that’s not really usable. Depending on your needs this may not be the case with the Siemens Siemens STEP 7 Lite package. The four major limitations in STEP 7 Lite verses the more advanced STEP 7 package are: 1. Support Support limited limited to the t he SIMATIC SIMATIC S7-300 PLC, the C7 all-in-one PLC and HMI, and the intelligent CPUs of the ET200 distributed I/O family. So no programming for the S7-200 or S7-400 PLC series. 2. No networking whatsoever. Remote Re mote I/O racks rac ks (IM modules) modules) are supported but there’s nothing for Profibus DP DP even e ven if you have a DP port on your CPU. 3. No support for multi-projects or HMI integration. 4. No communication communication processo proce ssors rs (CP) or function modules (FM) supported. If you’re interested in more details then refer to our chart of differences of differences between the Step 7 program packages.. So there are packages ar e quite a few major limitations limitations with the Step 7 Lite software which may end your further re ading of this review. On the other hand, the current availability of a free downl download oad of the SI SIMATI MATIC C Step 7 Lite software makes it awfully tempting to take ta ke a look at it. If your only use use of Siemens PLCs are an a n S7-300, S7-300, C7 or ET200 in a stand alone application a pplication with with no special needs ne eds (CP or FM) then I could c ould highl highly y recommend the Lite package. It has the same level of programming programming functionality functionality as the regular Step Step 7 packages plus some nifty nifty interface interfac e enhancements enhance ments to make it easier on the eyes and on the brain. It is possibl possiblee (though not easy) to c onvert any software c reated reate d in the STEP STEP 7 Lite to STEP STEP 7 and a nd visa visa versa keeping kee ping in mind mind the limitations of the Lite version. Since Since the packages bear a lot of similarities similarities it it will also be easy for the student to transfer tr ansfer any learning on the Lite package pac kage over to STEP STEP 7.

First Impressions Impressions For a user of the regular STEP STEP 7 software softwa re the first thing to notice is there is no SIMAT SIMATIC IC Manager. That’s because t he Lite version doesn’t support multi-projects multi-projects or net working. working. The The STEP STEP 7 Lite software opens right right up to the editor screen.

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The overall aim of the Lite package packa ge was to make the interface interfa ce easier ea sier for new users. I think they’ve done that while while making it friendlier friendlier for everyone involved. involved. The added graphics and color c olor are a welcome addition. Another nice friendly feature is the ext ended hover help on the menus and icons where clicking on the tool tip expands it into more help text. On that note all the pop up dialogs are clearer c learer then its STEP STEP 7 counterpart. c ounterpart. One of the major differences can c an be seen see n on the left hand ha nd side window. window. Pretty much everything e verything the programmer programmer needs nee ds for maintaining the project is neatly organized organized here. There’s even a convenient thumb tack to pin it or make it automatically a utomatically slide slide in and out when needed. On the right right hand side is the old familiar tree structure of commands and blocks. It’s missing missing the quick little reference refere nce help window on the bott om which which has been be en replaced replace d by just hovering your your mouse over the command to get a fuller title (the F1 key works just just the same too). The FC and FB blocks have been moved from here to a more logical logical place in the project window on on the left le ft hand side.

The Left Side Bar – CPU Overview and Project Window The top portion introduces a CPU C PU box with with easy ea sy access acce ss to controls, diagnostics diagnostics (Ctrl+D) and setup of the CPU CP U. That’s not something I feel is necessary to t o be there t here all a ll the time so I minimized minimized it. Too bad there’s no apparent appare nt way to just get rid of it all together. together. The Project Window below it it is great. Everything’s is here from hardware t o documentation. Something Something that just thrilled me is the tabs below that separate the offline and online online versions of the program. On the regul re gular ar STEP 7 software there ther e is often a confusio c onfusion n between when you are offline or online. online. STEP STEP 7 Lite minimizes minimizes that confusion confusion by also provided clearly c learly differentiated color schemes for when you have a block open online. online. And if that wasn’t all, the symbols beside the hardware and each eac h block instantly tell you of differences between bet ween the offline and online online versions of your program. You can just hover the mouse over the symbol to get more detail. deta il. It’s also nice to have a ll the blocks clearly color coded and nicely arranged. You can drag and drop then anywhere in the list. There’s even a new feature of “Category” “ Category” which is simply simply an organizational organizational label inserted between be tween blocks. In this screen I’ve inserted the category “Engine Data” and “Special Data”. This could be really helpful for logically grouping blocks in larger projects. I also like the new way wa y of creating cre ating blocks. blocks. From the pull down menu select Insert | Block … and this t his nifty nifty dialog box pops up with all the selections on it. Even the OB selection has a nice drop down box of all the OBs available with its symbolic name.

The Hardware Manager The great greatest est change of all is the overhauled hardware manager. The layout is great great and a nd is to be expected without the need to factor in networking. Just drag and drop your hardware on the picture and away you go. There’s even a nice hardware comparison feature clearly showing any differences between the t he offline and online online setups.

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http://www.plcdev.com/book/export/html/373

The Editor Much of the editor is like its big sister STEP 7. One noticeable pa rt that’s “missing in action” is the detail view that gives quick access to info, cross reference, address info, etc. One part I like is a slight revamp of the declaration table. Instead of the tree like structure it’s one simple table with a column indicating its declaration. That means no ha ving to dig through the tree just to see all the declaration variables.

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Conclusion Other then what we’ve all ready listed there are no other major differences. The symbol table, monitor/modify (a.k.a. VAT), and the reference data are all very similar to STEP 7. Overall, if you can live with the limitations, the STEP 7 Lite version is a great little package. Hopefully some of the better implementations will find there way into the STEP 7 software.

P.S. One little caveat is that it kept crashing on my plenty beef y enough Windows XP Home computer. Save often, arrgh!

Step 7 Connecting, Downloading and Uploading These are general guidelines for connecting, downloading and uploading from an S7-300 or S7-400 PLC. The following procedures were created using Siemens SIMATIC STEP 7 version 5.4 software. To start, open the SIMATIC Manager.

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Now follow the links below.

Connecting to the S7 PLC The Programming Cables There are three major types of programming cables: 1. The CP5512 card in a PCMCIA slot.

2. The PC Adapter using a serial or USB connection

3. An Ethernet cable

The CP5512 card and the PC Adapter can communicate on either an MPI or PROFIBUS port. Note

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that PROFIBUS is labeled as DP on the Siemens connection ports. These ca bles can piggyback on existing connectors. Be aware that the PC Adapter draws its power to work from the connection port so check the power LED for proper operation. The CP5512 card draws its power from the computer. For Ethernet (TCP/IP) use a standard Ethernet cable from the computer to a CPU with an Ethernet port, a CP 343/443 module or a network switch all ready attached to the PLC network.

Checking Communications With the programming cable plugged in, you can check for proper operation by clicking on the Accessible Nodes icon.

If communications are successful, you'll see a window pop up similar to the one below. If so, then close the Accessible Nodes window and proceed to the download or upload section.

If communication fails then you will receive a message like below.

This indicates that the cable is not in the right computer port or the cable is not plugged in properly.

Setting the PG/PC Interface In order to start communication to the PLC you will need to match the "PG Interface" setting with the programming cable and protocol. To do this, select t he menu Options > Set PG/PC Interface .

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The following dialog box will open up displaying all the different interfaces (i.e. communication drivers).

Each cable has its own interface. For Ethernet select the TCP/IP interface for your computers network card. Be careful not to select your wireless Ethernet connection. To get it working quickly it is best to select the interface with the Auto designation. This will discover working settings and use them automatically.

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For the PC Adapter click on the Properties button and make sure the Station Parameters Address is a unique network address. It should not conflict with existing PLC and slave devices on the network. Also, check under the Local Connection tab and make sure connection selection matches the port the cable is connected into. Once the proper interface is selected and the properties are set then click OK and use the Accessible Nodes window to check for successful communications. It should work. If not double-check the connection and cable. With the CP5512 and PC Adapter c ables, you should use the MPI port, as this is the default connection for Siemens. If this doesn't work then I don't know what to tell you.

Downloading First, in order to enable the download menu commands, you must select the Block folder in the project's station you wish to download.

There are three methods of downloading. 1. Partial download of selected blocks 2. Full download of all blocks and system data 3. Complete deletion of online PLC blocks and then downloading of all blocks and system data

Partial Download Partial downloads are used in existing projects where only one or more blocks will be downloaded. To perform this type of download select the block(s) you wish to download and then select the PLC > Download menu item or the download button

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Holding down the Ctrl key or the Shift key allows more then one block to be selected at a time. Be careful though as the order of download will occur in the order that the blocks were selected. This may mean that an error will occur if a block is called before it is downloaded. The CPU will need to be in Stop mode before downloading the System Data Block (SDB) as this is equivalent to a hardware configuration download. This is usually not necessary in a PLC that has all ready had its hardware configured. If you do download the system data, the following messages will prompt you through the transitions.

If the CPU is in Run mode then you will be prompted to Stop the CPU. The software will do the Run to Stop transition when you click OK.

After downloading the SDB you will be prompted to Run the CPU again.

Clicking Yes will automatically put the CPU back into run mode.

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Full Download To download all the blocks at once make sure you are in the Block folder and select the Edit > Select All menu item. Click on the Download icon . You will be prompted to overwrite any existing blocks and if you want to load the system data (see above).

Clearing the CPU Memory and then Downloading The partial and full download methods above will overwrite existing blocks but will not any blocks from memory. In order to completely delete the existing program in the CP U and download a new project select the Blocks folder and then use the PLC > Download User Program to Memory Card menu item.

The following dialog box will pop up prompting you about the deletion of all the blocks and project data in the PLC. Click Yes to perform the operation.

After this, follow the normal download procedure.

Uploading There are two methods for uploading. The first is when you have the original project and you want to preserve the symbols and comments. The second method, when you don't have the original project, will upload everything from the CPU but will have no associated documentation (i.e. symbols and comments).

Uploading to an Existing Project With the existing project open, select the View > Online menu item.

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This is the same as the Online button on the icon bar.

This will open up another window called the Online Partner. It shows the e xisting blocks inside the CPU. The Online version is indicated by the highlighted title bar.

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There is a connection between these two versions so that uploading from the online partner makes sure to preserve all the symbols and comments. Be careful. After uploading, make sure t o close the online partner and do all work from the offline version. To upload individual blocks, select them in the Online view and choose the PLC > Upload to PG menu item. For a full upload, select the Block folder and do the same.

Upload without an Existing Project Follow these steps when you do not have the original project but wish to upload the program for backup purposes. With an existing project open or a new blank project select the PLC > Upload Station to PG… menu selection.

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In the next screen, fill in the slot the CPU is in (this is always 2 for S7-300) and the node address of the communication port on the CPU. In the case below we are talking to a CPU over MPI with node address 10.

After clicking OK, the whole contents of the PLC including all blocks and hardware configuration will be uploaded into a new station in the project.

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While this project contains no documentation, it can be used as a ba ckup to download later if needed.

Step 7 Lite, Step 7 and Step 7 Professional Differences STEP 7 Lite

STEP 7

STEP 7 Professional

Configuring

PLCs

S7-300/C7

S7-300/ S7-400/C7/WinAC

Digital, analog I/O, IFM centralized only

Digital, analog I/O, IFM, FM, CP centralized and distributed (DP)

Networking/communications

No

Time-driven, cyclic data transmission between automation components; MPI, PROFIBUS or Industrial Ethernet

Distributed I/O

No

Yes

Alarm configuring (display->HMI)

No

Yes

Yes, in CPU only

Yes, in CPU and direct on PG/PC (updating of PLC operating system possible)

Program, symbols

Program, symbols, hardware configuration

Modules

Write/read to/from MMC

Export/import

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Included

Included - S7-DOCPRO option for standardcompliant documentation of the S7 project

Multi-language documentation of projects

Yes

Yes

Multi-user engineering

No

Yes

Documentation function

Programming

Languages

LAD/FBD/STL

LAD/FBD/STL and STL sources

As Step 7 + S7-Graph (sequencer)/S7-SCL (textual high-level language)

Structured/symbolic programming

Yes/Yes

Yes/Yes

Check/establish program consistency

Yes/Yes

Yes/Yes

Standard libraries/user libraries

Yes/No

Yes/Yes

Online access

MPI

MPI, Profibus, Option: Industrial Ethernet

Test functions

Monitor, control, force

Monitor, control, force, single step (debug)

Program, hardware configuration

Program

System diagnostics

System diagnostics, r eport system fault, integrated process fault diagnostics in S7-Graph

Online functions

Comparison function offline/online

Diagnostics

Optional packages

Optional programming languages

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None

S7-Graph, S7-SCL,

S7-HiGraph, CFC

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S7-HiGraph, CFC

Options for simulation, documentation, diagnostics and remote maintenance

S7-PLCSIM, S7-Teleservice

S7-PLCSIM, S7-Teleservice, S7-DOCPRO, S7-Pdiag

S7-Teleservice, S7-DOCPRO, S7-Pdiag (S7-PLCSIM is all ready included in package)

The Case of the Missing SIMATIC Step 7 Documentation “We had documentation at one time.” Sound familiar? Have you suddenly found changes that have been made in the PLC but not in the offline program? Nobody knows what happened. Unfortunately this is an all too common phenomena with the Siemens SIMATIC Step 7 software. The problems stem from the flexibility of the software both for downloading and editing the online program. If the person is not familiar with the software it’s very ea sy to get confused if the changes are being made on the computer or in the controller. How to solve this problem? Let’s first of all review some basic terminology. After that is a step by step best pract ice when editing programs. Finally, we’ll highlight the pitfalls and the indicators that tell you whether you are offline or online. This procedure applies to SIMATIC Step 7 version 5.4.

Terminology Offline program – The program that is stored on the ha rd disk of the computer. This will contain the documentation. It’s very important to keep a pristine copy of the offline program as the associated documentation is not stored in the PLC. Online program – This is the program resident in the P LC. Download – The act of taking the offline program on the computer and downloading it into the PLC. Upload – Taking the program in the PLC and bringing it up to the computer. Doing this without having the associated offline program open will cause a loss of documentation.

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Save – Stores the open block onto the hard drive. It’s important to realize that an edited block can be downloaded to the PLC without saving it offline. Note that this only saves the opened block and not any others that are concurrently open.

These may seem like simple terms but it’s important to understand how they’re used in the Siemens environment. Here are some other terms that may come up. PG/PC – This is Siemens way of referring to a PC or laptop running the SIMATIC software. Nodes – Refers to any programmable device (in our case a P LC) in the network which will have its own unique address.

Best Practice The best practice is to make sure you are working from an offline file. There really isn’t any reason to be working on the program inside the PLC. Of course, this assumes that you have a good working copy to begin with. The “golden” copy of the program should live somewhere on a network server or have a dedicated place on one computer or laptop. I’ve even heard of some companies using USB memory sticks to store the latest and greatest which is great but a n original copy should still live on a computer that is backed up. 1. Open the offline file from the File pull down menu and select Open or use the Open Project icon on the toolbar. In the dialog box select the project under the User Project tab. Click OK. You may have to select Browse to find it in the directory structure. Note if the Manager was closed with a project open then it will open back up to that project automatically. 2. Expand the project tree down to the program files and select the Blocks folder. Good practice dictates that all blocks should be opened from here. 3. Once changes have been made: 1. Save the block to the hard disk by clicking the Save icon (or menu item File | Save) 2. Download the block by cli cking the Download icon (or menu item PLC | Download). If the block all ready exists in the PLC then it will confirm that you want to

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overwrite it1. Click Yes. 3. Note that downloading from here only sends that one block to the PLC. It does not download the entire program. 4. To monitor the block make sure to open it using steps 1 through 3 and then press the Monitor icon (or menu item Debug | Monitor). The window’s title bar will highlight a lovely shade of blue to indicate a connection to the CPU. It’s important to note here that you are still working with the program on the computer and not the PLC. If the procedure in step 3 has not been followed then discrepancies can occur between what you are monitoring in the PLC and what is displayed in the SIMATIC software. That’s it. Following these simple steps will save a lot of headaches.

The Pitfalls and Warning Signs So where do some people get lost? Here are some common mistakes and their warning signs. If you get any of these dialog boxes then you should really back out and start over because you’re on the road to losing your documentation.

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These dialog boxes are telling you that it cannot find the documentation for the local parameters and symbols. More then likely it will also not show any network comments or titles. The result of opening the block looks like this

This is an example void of documentation. Notice the local parameters all say TEMP. There are no comments or titles. There are no symbols so it’s all in direct addressing. The properly documented copy looks like this...

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Pitfall #1 – Using Accessible Nodes to Open Blocks

The Display Accessible Nodes selection under the PLC menu is a handy way to see what is connected to the network but it should never be used to open blocks. Opening blocks from here uploads it straight from the PLC and produces the warnings dialog boxes shown above.

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Pitfall #2 – Viewing Online from SIMATIC manager

Once a project is open and a connection to a PLC is established then selecting the Online button (menu View | Online) brings up a similar project tree showing the contents inside the PLC. The window title bar is highlighted in blue to indicate its online status. Working from this window presents less of a danger for losing documentation but it is confusing and could lead to problems. For instance if a block is renamed offline and then the old one is opened online then it will have no associated documentation. The proper way to view a block online is to open the block and select the Establish Connection to Configured CPU icon . Just make sure what you are viewing has been downloaded to the PLC.

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Pitfall #3 – Opening the Online Partner

If an offline block is open then selecting the Open Offline/Online Partner icon (menu item File | Open Online) will switch it to the online version of the block for editing. Essentially this puts you in the same place as pitfall #2.

Conclusion Programming with SIMATIC Step 7 is different enough from other types of PLCs to throw off the casual user. Always working from the offline copy will make it less likely to screw up. Opening up a block from the accessible nodes window is always a no-no. Likewise, opening a block from a window that has a highlighted blue title bar will also cause potential problems. Be sure and read all dialog boxes especially the ones we’ve shown in the article. Avoid the pitfalls and keep that documentation. Mystery solved.

Footnote: (1) Siemens dialog boxes have an option that says, “Do not display this message again.” This is handy for some annoying pop ups but it is really not a good idea to turn off important ones like warnings for overwriting blocks. These warnings are especially crucial if you are working on real machinery. If

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more then one person is using the software then you can re set these messages to display again by going to the SIMATIC Manager and select the menu Options | Customize. Click the General tab and press the Activate button. If it’s grayed out then all messages are set to display.

S7 Library Functions I couldn't find a complete listing of all the function blocks in the standard Siemens S7 Libraries so I made one myself. It helps me get a better overview of what is available. The complete listing is also available as an Excel spreadsheet so you can sort or adjust to your needs.

System Function Blocks

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Number Name

Family

Description

SFB 0

CTU

IEC_TC

Count Up

SFB 1

CTD

IEC_TC

Count Down

SFB 2

CTUD

IEC_TC

Count Up/Down

SFB 3

TP

IEC_TC

Generate a Pulse

SFB 4

TON

IEC_TC

Generate an On Delay

SFB 5

TOF

IEC_TC

Generate an Off Delay

SFB 8

USEND

COM_FUNC Uncoordinated Sending of Data

SFB 9

URCV

COM_FUNC Uncoordinated Receiving of Data

SFB 12

BSEND

COM_FUNC Sending Segmented Data

SFB 13

BRCV

COM_FUNC Receiving Segmented Data

SFB 14

GET

COM_FUNC Read Data from a Remote CPU

SFB 15

PUT

COM_FUNC Write Data to a Remote CPU

SFB 16

PRINT

COM_FUNC Send Data to Printer

SFB 19

START

COM_FUNC Initiate a Warm or Cold Restart on a Remote Device

SFB 20

STOP

COM_FUNC Changing a Remote Device to the STOP State

SFB 21

RESUME

COM_FUNC Initiate a Hot Restart on a Remote Device

SFB 22

STATUS

COM_FUNC Query the Status of a Remote Partner

SFB 23

USTATUS

COM_FUNC Receive the Status of a Remote Device

SFB 29

HS_COUNT COUNTERS Counter (high-speed counter, integrated function) (only exist on the CPU 312 IFM and CPU 314 IFM)

SFB 30

FREQ_MES COUNTERS Frequency Meter (frequency meter, integrated function (only exist on the CPU 312 IFM and CPU 314 IFM)

SFB 31

NOTIFY_8P COM_FUNC Generating block related messages without acknowledgement indication

SFB 32

DRUM

TIMERS

Implement a Sequencer

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8


SFB 33

ALARM

COM_FUNC Generate Block-Related Messages with Acknowledgment Display

SFB 34

ALARM_8

COM_FUNC Generate Block-Related Messages without Values for 8 Signals

SFB 35

ALARM_8P COM_FUNC Generate Block-Related Messages with Values for 8 Signals

SFB 36

NOTIFY

COM_FUNC Generate Block-Related Messages without Acknowledgment Display

SFB 37

AR_SEND

COM_FUNC Send Archive Data

SFB 38

HSC_A_B

COUNTERS Counter A/B (integrated function) (only exist on the CPU 314 IFM)

SFB 39

POS

ICONT

Position (integrated function) (only exist on the CPU 314 IFM)

SFB 41

CONT_C

ICONT

Continuous Control (only exist on the CPU 314 IFM)

SFB 42

CONT_S

ICONT

Step Control (only exist on the CPU 314 IFM)

SFB 43

PULSEGEN ICONT

Pulse Generation (only exist on the CPU 314 IFM)

SFB 44

ANALOG

TEC_FUNC

Positioning with Analog Output (only exist on the S7-300C CPUs)

SFB 46

DIGITAL

TEC_FUNC

Positioning with Digital Output (only exist on the S7-300C CPUs)

SFB 47

COUNT

TEC_FUNC

Controlling the Counter (only exist on the S7-300C CPUs)

SFB 48

FREQUENC TEC_FUNC

Controlling the Frequency Measurement (only exist on the S7-300C CPUs)

SFB 49

PULSE

TEC_FUNC

Controlling Pulse Width Modulation (only exist on the S7-300C CPUs)

SFB 52

RDREC

DP

Reading a Data Record

SFB 53

WRREC

DP

Writing a Data Record

SFB 54

RALRM

DP

Receiving an Interrupt

SFB 60

SEND_PTP

TEC_FUNC

Sending Data (ASCII, 3964(R)) (only exist on the S7-300C CPUs)

SFB 61

RECV_PTP

TEC_FUNC

Receiving Data (ASCII, 3964(R)) (only exist on the S7-300C CPUs)

SFB 62

RES_RECV TEC_FUNC

Deleting the Receive Buffer (ASCII, 3964(R)) (only exist on the S7-300C CPUs)

SFB 63

SEND_RK

TEC_FUNC

Sending Data (RK 512) (only exist on the S7-300C CPUs)

SFB 64

FETCH_RK TEC_FUNC

Fetching Data (RK 512) (only exist on the S7-300C CPUs)

SFB 65

SERVE_RK TEC_FUNC

Receiving and Providing Data (RK 512) (only exist on the S7-300C CPUs)

SFB 75

SALRM

DP

Send interrupt to DP master

SFB 81

RD_DPAR

IO_FUNCT

Read Predefined Parameter

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System Function Calls

28

8

Number Name

Family

Description

SFC 0

SET_CLK

CLK_FUNC

Set System Clock

SFC 1

READ_CLK

CLK_FUNC

Read System Clock

SFC 2

SET_RTM

CLK_FUNC

Set Run-time Meter

SFC 3

CTRL_RTM

CLK_FUNC

Start/Stop Run-time Meter

SFC 4

READ_RTM

CLK_FUNC

Read Run-time Meter

SFC 5

GADR_LGC

IO_FUNCT

Query Logical Address of a Channel

SFC 6

RD_SINFO

DB_FUNCT

Read OB Start Information

SFC 7

DP_PRAL

DP

Trigger a Hardware Interrupt on the DP Master

SFC 9

EN_MSG

COM_FUNC Enable Block-Related, Symbol-Related and Group Status Messages

SFC 10

DIS_MSG

COM_FUNC Disable Block-Related, Symbol-Related and Group Status Messages

SFC 11

DPSYC_FR

DP

Synchronize Groups of DP Slaves

SFC 12

D_ACT_DP

DP

Deactivation and activation of DP slaves

SFC 13

DPNRM_DG DIAGNSTC

Read Diagnostic Data of a DP Slave (Slave Diagnostics)

SFC 14

DPRD_DAT

DP

Read Consistent Data of a Standard DP Slave

SFC 15

DPWR_DAT DP

Write Consistent Data to a DP Standard Slave

SFC 17

ALARM_SQ

PMC_FUNC Generate Acknowledgeable Block-Related Messages

SFC 18

ALARM_S

PMC_FUNC Generate Permanently Acknowledged Block-Related Messages

SFC 19

ALARM_SC

PMC_FUNC Query the Acknowledgment Status of the last ALARM_SQ Entering State Message

SFC 20

BLKMOV

MOVE

Copy Variables

SFC 21

FILL

MOVE

Initialize a Memory Area

SFC 22

CREAT_DB

DB_FUNCT

Create Data Block

SFC 23

DEL_DB

DB_FUNCT

Delete Data Block

SFC 24

TEST_DB

DB_FUNCT

Test Data Block

SFC 25

COMPRESS

DB_FUNCT Compress the User Memory

SFC 26

UPDAT_PI

IO_FUNCT

Update the Process Image Update Table

SFC 27

UPDAT_PO

IO_FUNCT

Update the Process Image Output Table

SFC 28

SET_TINT

PGM_CNTL Set Time-of-Day Interrupt

SFC 29

CAN_TINT

PGM_CNTL Cancel Time-of-Day Interrupt

SFC 30

ACT_TINT

PGM_CNTL Activate Time-of-Day Interrupt

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8


SFC 31

QRY_TINT

PGM_CNTL Query Time-of-Day Interrupt

SFC 32

SRT_DINT

PGM_CNTL Start Time-Delay Interrupt

SFC 33

CAN_DINT

PGM_CNTL Cancel Time-Delay Interrupt

SFC 34

QRY_DINT

PGM_CNTL Query Time-Delay Interrupt

SFC 35

MP_ALM

PGM_CNTL Trigger Multicomputing Interrupt

SFC 36

MSK_FLT

DIAGNSTC

Mask Synchronous Errors

SFC 37

DMSK_FLT

DIAGNSTC

Unmask Synchronous Errors

SFC 38

READ_ERR

DIAGNSTC

Read Error Register

SFC 39

DIS_IRT

IRT_FUNC

Disable New Interrupts and Asynchronous Errors

SFC 40

EN_IRT

IRT_FUNC

Enable New Interrupts and Asynchronous Errors

SFC 41

DIS_AIRT

IRT_FUNC

Delay Higher Priority Interrupts and Asynchronous Errors

SFC 42

EN_AIRT

IRT_FUNC

Enable Higher Priority Interrupts and Asynchronous Errors

SFC 43

RE_TRIGR

PGM_CNTL Re-trigger Cycle Time Monitoring

SFC 44

REPL_VAL

DIAGNSTC

SFC 46

STP

PGM_CNTL Change the CPU to STOP

SFC 47

WAIT

PGM_CNTL Delay Execution of the User Program

SFC 48

SNC_RTCB

CLK_FUNC

Synchronize Slave Clocks

SFC 49

LGC_GADR

IO_FUNCT

Query the Module Slot Belonging to a Logical Address

SFC 50

RD_LGADR

IO_FUNCT

Query all Logical Addresses of a Module

SFC 51

RDSYSST

DIAGNSTC

Read a System Status List or Partial List

SFC 52

WR_USMSG

DIAGNSTC

Write a User-Defined Diagnostic Event to the Diagnostic Buffer

SFC 54

RD_PARM

IO_FUNCT

Read Defined P arameters

SFC 55

WR_PARM

IO_FUNCT

Write Dynamic Parameters

SFC 56

WR_DPARM IO_FUNCT

Write Default Parameters

SFC 57

PARM_MOD IO_FUNCT

Assign Parameters to a Module

SFC 58

WR_REC

IO_FUNCT

Write a Data Record

SFC 59

RD_REC

IO_FUNCT

Read a Data Record

SFC 60

GD_SND

COM_FUNC Send a GD Packet

SFC 61

GD_RCV

COM_FUNC Fetch a Received GD Packet

SFC 62

CONTROL

COM_FUNC Query the Status of a Connection Belonging to a Communication SFB Instance

SFC 63

AB_CALL

PLASTICS

Assembly Code Block (only exists for CPU 614)

SFC 64

TIME_TCK

CLK_FUNC

Read the System Time

Transfer Substitute Value to Accumulator 1

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SFC 65

X_SEND

COM_FUNC Send Data to a Communication Partner outside the Local S7 Station

SFC 66

X_RCV

COM_FUNC Receive Data from a Communication Partner outside the Local S7 Station

SFC 67

X_GET

COM_FUNC Read Data from a Communication Partner outside the Local S7 Station

SFC 68

X_PUT

COM_FUNC Write Data to a Communication Partner outside the Local S7 Station

SFC 69

X_ABORT

COM_FUNC Abort an Existing Connection to a Communication Partner outside the Local S7 Station

SFC 70

GEO_LOG

IO_FUNCT

Determine Start Address of a Module

SFC 71

LOG_GEO

IO_FUNCT

Determine the Slot Belonging to a Logical Address

SFC 72

I_GET

COM_FUNC Read Data from a Communication Partner within the Local S7 Station

SFC 73

I_PUT

COM_FUNC Write Data to a Communication Partner within the Local S7 Station

SFC 74

I_ABORT

COM_FUNC Abort an Existing Connection to a Communication Partner within the Local S7 Station

SFC 78

OB_RT

DIAGNSTC

Determine OB program runtime

SFC 79

SET

BIT_LOGC

Set a Range of Outputs

SFC 80

RSET

BIT_LOGC

Reset a Range of Outputs

SFC 81

UBLKMOV

MOVE

Uninterruptible Block Move

SFC 82

CREA_DBL

DB_CTRL

Create a Data Block in the Load Memory

SFC 83

READ_DBL

DB_CTRL

Read from a Data Block in Load Memory

SFC 84

WRIT_DBL

DB_CTRL

Write from a Data Block in Load Memory

SFC 85

CREA_DB

DB_FUNCT

Create a Data Block

SFC 87

C_DIAG

COM_FUNC Diagnosis of the Actual Connection Status

SFC 90

H_CTRL

HF_FUNCT

Control Operation in H Systems

SFC 100 SET_CLKS

CLK_FUNC Setting the Time-of-Day and the TOD Status

SFC 101 RTM

CLK_FUNC

Handling runtime meters

SFC 102 RD_DPARA

IO_FUNCT

Redefined Parameters

SFC 103 DP_TOPOL

DP

Identifying the bus topology in a DP master system

SFC 104 CIR

PGM_CNTL Controlling CiR

SFC 105 READ_SI

PMC_FUNC Reading Dynamic System Resources

SFC 106 DEL_SI

PMC_FUNC Deleting Dynamic System Resources

SFC 107 ALARM_DQ PMC_FUNC Generating Always Acknowledgeable and Block-Related Messages

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8

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SFC 108 ALARM_D

PMC_FUNC Generating Always Acknowledgeable and Block-Related Messages

SFC 112 PN_IN

PROFIne2

Update inputs in the user program interface of PROFInet components

SFC 113 PN_OUT

PROFIne2

Update outputs in the user program interface of PROFInet components

SFC 114 PN_DP

PROFIne2

Update DP interconnections

SFC 126 SYNC_PI

IO_FUNCT

Update process image partition input table in synchronous cycle

SFC 127 SYNC_PO

IO_FUNCT

Update process image partition output table in synchronous cycle

S5-S7 Converting Blocks

31

8

Number Name

Family

Description

FC 61

GP_FPGP

S5_CNVRT Change fixed point number to floating point number

FC 62

GP_GPFP

S5_CNVRT Change floating point number to fixed point number

FC 63

GP_ADD

S5_CNVRT Add floating point numbers

FC 64

GP_SUB

S5_CNVRT Subtract floating point numbers

FC 65

GP_MUL

S5_CNVRT Multiply floating point number

FC 66

GP_DIV

S5_CNVRT Divide floating point numbers

FC 67

GP_VGL

S5_CNVRT Compare floating point numbers

FC 68

RAD_GP

S5_CNVRT Extract root of floating point numbers

FC 69

MLD_TG

S5_CNVRT Clock generator

FC 70

MLD_TGZ

S5_CNVRT Clock generator (timing element)

FC 71

MLD_EZW

S5_CNVRT Message of first value with single flashing light, wordwise, A

FC 72

MLD_EDW

S5_CNVRT Message of first value with double flashing light, wordwise, A

FC 73

MLD_SAMW S5_CNVRT Collected message, wordwise (sound alert)

FC 74

MLD_SAM

S5_CNVRT Collected message, bitwise

FC 75

MLD_EZ

S5_CNVRT Message of first value with single flashing light, bitwise, A

FC 78

MLD_EDWK S5_CNVRT Message of first value with double flashing light, wordwise, A+M

FC 79

MLD_EZK

S5_CNVRT Message of first value with single flashing light, bitwise, A+M

FC 80

MLD_EDK

S5_CNVRT Message of first value with double flashing light, bitwise, A+M

FC 81

COD_B4

S5_CNVRT Change BCD number to 16 bit dual number

FC 82

COD_16

S5_CNVRT Change 16 bit dual number to BCD number

FC 83

MUL_16

S5_CNVRT Multiply 16 bit dual numbers

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8


FC 84

DIV_16

S5_CNVRT Divide 16 bit dual numbers

FC 85

ADD_32

S5_CNVRT Add 32 bit dual numbers

FC 86

SUB_32

S5_CNVRT Subtract 32 bit dual numbers

FC 87

MUL_32

S5_CNVRT Multiply 32 bit dual numbers

FC 88

DIV_32

S5_CNVRT Divide 32 bit dual numbers

FC 89

RAD_16

S5_CNVRT Extract roots of 16 bit dual numbers

FC 90

REG_SCHB

S5_CNVRT Bi-directional shift register, bitwise

FC 91

REG_SCHW

S5_CNVRT Bi-directional shift register, wordwise

FC 92

REG_FIFO

S5_CNVRT Buffer memory (FIFO)

FC 93

REG_LIFO

S5_CNVRT Stack register (LIFO)

FC 94

DB_COPY1

S5_CNVRT Copy data block, direct assignment of parameters

FC 95

DB_COPY2

S5_CNVRT Copy data block, indirect assignment of parameterization

FC 96

RETTEN

S5_CNVRT Save scratchpad memory

FC 97

LADEN

S5_CNVRT Load scratchpad memory

FC 98

COD_B8

S5_CNVRT Change BCD number to 32 bit dual number

FC 99

COD_32

S5_CNVRT Change 32 bit dual number to BCD number

FC 100

AE_460_1

S5_CNVRT Read analog value

FC 101

AE_460_2


FC 102

AE_463_1


FC 103

AE_463_2


FC 104

AE_464_1


FC 105

AE_464_2


FC 106

AE_466_1


FC 107

AE_466_2


FC 108

RLG_AA1

S5_CNVRT Output analog value

FC 109

RLG_AA2

S5_CNVRT Output analog value

FC 110

PER_ET1

S5_CNVRT Read and Write for extended periphery (direct assignment of parameters)

FC 111

PER_ET2

S5_CNVRT Read and Write for extended periphery (indirect assignment of parameters)

FC 112

SINUS

S5_CNVRT Sine (x)

FC 113

COSINUS

S5_CNVRT Cosine (x)

FC 114

TANGENS

S5_CNVRT Tangent (x)

FC 115

COTANG

S5_CNVRT Cotangent (x)

FC 116

ARCSIN

S5_CNVRT Arc sine (x)

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FC 117

ARCCOS

S5_CNVRT Arc cosine (x)

FC 118

ARCTAN

S5_CNVRT Arc tangent (x)

FC 119

ARCCOT

S5_CNVRT Arc cotangens (x)

FC 120

LN_X

S5_CNVRT Natural logarithm ln (x)

FC 121

LG_X

S5_CNVRT Decade logarithm Iog (x)

FC 122

B_LOG_X

S5_CNVRT General logarithm log (x) to basis b

FC 123

E_H_N

S5_CNVRT e to the power of n

FC 124

ZEHN_H_N

S5_CNVRT 10 to the power of n

FC 125

A2_H_A1

S5_CNVRT AKKU 2 to the power of AKKU 1

IEC Function Blocks Number Name

33

8

Family Description

FC 1

AD_DT_TM IEC

Point Math Add duration to a time

FC 2

CONCAT

Combine two STRING variables

FC 3

D_TOD_DT IEC

Combine DATE and TIME_OF_DAY to DT

FC 4

DELETE

IEC

Delete in a STRING variable

FC 5

DI_STRNG

IEC

Data type conversion DINT to STRING

FC 6

DT_DATE

IEC

Extract the DATE from DT

FC 7

DT_DAY

IEC

Extract the day of the week from DT

FC 8

DT_TOD

IEC

Extract the TIME_OF_DAY from DT

FC 9

EQ_DT

IEC

Compare DT for equal

FC 10

EQ_STRNG IEC

Compare STRING for equal

FC 11

FIND

IEC

Find in a STRING variable

FC 12

GE_DT

IEC

Compare DT for greater than or equal

FC 13

GE_STRNG IEC

Compare STRING for greater than or equal

FC 14

GT_DT

Compare DT for greater than

FC 15

GT_STRNG IEC

Compare STRING for greater than

FC 16

I_STRNG

IEC

Data type conversion INT to STRING

FC 17

INSERT

IEC

Insert in a STRING variable

FC 18

LE_DT

IEC

Compare DT for smaller than or equal

FC 19

LE_STRNG IEC

Compare STRING for smaller than or equal

FC 20

LEFT

IEC

Left part of a STRING variable

FC 21

LEN

IEC

Length of a STRING variable

FC 22

LIMIT

IEC

Point Math Limit

IEC

IEC

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FC 23

LT_DT

IEC

Compare DT for smaller than

FC 24

LT_STRNG

IEC

Compare STRING for smaller than

FC 25

MAX

IEC

Point Math Select maximum

FC 26

MID

IEC

Middle part of a STRING variable

FC 27

MIN

IEC

Point Math Select minimum

FC 28

NE_DT

IEC

Compare DT for unequal

FC 29

NE_STRNG IEC

Compare STRING for unequal

FC 30

R_STRNG

IEC

Data type conversion REAL to STRING

FC 31

REPLACE

IEC

Replace in a STRING variable

FC 32

RIGHT

IEC

Right part of a STRING variable

FC 33

S5TI_TIM

IEC

Data type conversion S5TIME to TIME

FC 34

SB_DT_DT

IEC

Point Math Subtract two time values

FC 35

SB_DT_TM

IEC

Point Math Subtract duration from a time

FC 36

SEL

IEC

Point Math Binary selection

FC 37

STRNG_DI

IEC

Data type conversion STRING to DINT

FC 38

STRNG_I

IEC

Data type conversion STRING to INT

FC 39

STRNG_R

IEC

Data type conversion STRING to REAL

FC 40

TIM_S5TI

IEC

Data type conversion TIME to S5TIME

PID Control Blocks Number Name

Family

Description

FB 41

CONT_C

ICONT

Continuous Control

FB 42

CONT_S

ICONT

Step Control

FB 43

PULSEGEN ICONT

FB 58

TCONT_CP CONTROL Temperature Continuous Controller

FB 59

TCONT_S

Pulse Generation

CONTROL Temperature Step Controller

Communication Blocks

34

8

Number Name

Family

Description

FB 2

IDENTIFY

CP_300

For checking device properties

FB 3

READ

CP_300

Reads data from a data area of the communication partner specified by a name or index depending on the assignment of parameters for the job.

FB 4

REPORT

CP_300

Allows unconfirmed transmission of variables by an FMS server.

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8


FB 5

STATUS

CP_300

allows status information to be requested from the communications partner on the specified FMS connection.

FB 6

WRITE

CP_300

Transfers data from a specified local data area to a data area on the communication partner.

FB 8

USEND

CP_300

Uncoordinated Sending of Data

FB 9

URCV

CP_300

Uncoordinated Receiving of Data

FB 12

BSEND

CP_300

Sending Segmented Data

FB 13

BRCV

CP_300

Receiving Segmented Data

FB 14

GET

CP_300

Read Data from a Remote CPU

FB 15

PUT

CP_300

Write Data to a Remote CPU

FB 20

GETIO

IO_FUNCT Read All Inputs of a DP Standard Slave/PROFINET IO Device

FB 21

SETIO

IO_FUNCT Write All Outputs of a DP Standard Slave/PROFINET IO Device

FB 22

GETIO_PART

IO_FUNCT Read a Part of the Inputs of a DP Standard Slave/PROFINET IO Device

FB 23

SETIO_PART

IO_FUNCT Write a Part of the Outputs of a DP Standard Slave/PROFINET IO Device

FB 55

IP_CONFIG

CP_300

Transfers a configuration data block (CONF_DB) containing connection data for an Ethernet CP.

FB 63

TSEND

COMM

Sending Data via TCP native and ISO on TCP

FB 64

TRCV

COMM

Receiving Data via TCP native and ISO on TCP

FB 65

TCON

COMM

Establishing a Connection using TCP native and ISO on TCP

FB 66

TDISCON

COMM

Terminating a Connection using TCP native and ISO on TCP

FB 67

TUSEND

COMM

Sending Data via UDP

FB 68

TURCV

COMM

Receiving Data via UDP

FC 1

DP_SEND

CP_300

transfers data to the PROFIBUS CP

FC 2

DP_RECV

CP_300

receives data on PROFIBUS

FC 3

DP_DIAG

CP_300

used to request diagnostic information

FC 4

DP_CTRL

CP_300

transfers control jobs to the PROFIBUS CP

FC 5

AG_SEND

CP_300

data by means of a configured connection to the communication partner (<= 240 bytes).

FC 6

AG_RECV

CP_300

data by means of a configured connection from the communication partner (<= 240 bytes, not email).

FC 7

AG_LOCK

CP_300

the external data access by means of FETCH/WRITE (not for UDP, email).

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FC 8

AG_UNLOCK

CP_300

the external data access by means of FETCH/WRITE (not for UDP, email).

FC 10

AG_CNTRL

CP_300

allows you to diagnose connections. When necessary, you can reinitialize connection establishment using the FC.

FC 11

PNIO_SEND

CP_300

used for data transfer in the CP modes PROFINET IO controller or PROFINET IO device.

FC 12

PNIO_RECV

CP_300

used to receive data in the CP modes P ROFINET IO controller or PROFINET IO device.

FC 40

FTP_CONNECT CP_300

Establish an FTP connection

FC 41

FTP_STORE

Store a file on the FTP server

FC 42

FTP_RETRIEVE CP_300

Retrieve a file from the FTP server

FC 43

FTP_DELETE

CP_300

Delete a file on the FTP server

FC 44

FTP_QUIT

CP_300

Enable an FTP connection

FC 50

AG_LSEND

CP_300

data by means of a configured connection to the communication partner.

FC 60

AG_LRECV

CP_300

data by means of a configured connection from the communication partner (not email).

FC 62

C_CNTRL

CP_300

Query a connection status for S7-300

CP_300

TI-S7 Converting B locks Number Name

36

8

Family

Description

FB 80

LEAD_LAG CONVERT Lead/Lag Algorithm

FB 81

DCAT

TIMERS

Discrete Control Alarm Timer

FB 82

MCAT

TIMERS

Motor Control Alarm Timer

FB 83

IMC

COMPARE Index Matrix Compare

FB 84

SMC

COMPARE Scan Matrix Compare

FB 85

DRUM

TIMERS

Event Maskable Drum

FB 86

PACK

MOVE

Pack Data

FC 80

TONR

TIMERS

Software Timer On Delay—Retentive

FC 81

IBLKMOV

MOVE

Indirect Block Move

FC 82

RSET

BIT_LOGC Reset Range of Outputs

FC 83

SET

BIT_LOGC Set Range of Outputs

FC 84

ATT

TABLE

Add to Table

FC 85

FIFO

TABLE

First In/First Out Unload Table

FC 86

TBL_FIND

TABLE

Table Find

FC 87

LIFO

TABLE

Last In/First Out Unload Table

2/13/2011 8



FC 88

TBL

TABLE

Table

FC 89

TBL_WRD

TABLE

Move Table to Word

FC 90

WSR

SHIFT

Word Shift Register

FC 91

WRD_TBL

TABLE

Word to Table

FC 92

SHRB

SHIFT

Bit Shift Register

FC 93

SEG

CONVERT Seven Segment Decoder

FC 94

ATH

CONVERT ASCII to Hex

FC 95

HTA

CONVERT Hex to ASCII

FC 96

ENCO

CONVERT Encode Binary Position

FC 97

DECO

CONVERT Decode Binary Position

FC 98

BCDCPL

CONVERT Ten’s Complement

FC 99

BITSUM

CONVERT Sum Number of Bits

FC 100

RSETI

BIT_LOGC Reset Range of Immediate Outputs

FC 101

SETI

BIT_LOGC Set Range of Immediate Outputs

FC 102

DEV

MATH_FP

Standard Deviation

FC 103

CDT

TABLE

Correlated Data Table

FC 104

TBL_TBL

TABLE

Table to Table

FC 105

SCALE

CONVERT Scaling Values

FC 106

UNSCALE

CONVERT Unscaling Values

Miscellaneous Blocks

3

8

Number Name

Family

Description

FB 60

SET_SW

TIMEFUNC supports the summertime/wintertime changeover in CPUs that do not have the time status. For this purpose it sets the CPU clock to the current time and according to the changeover rules in the Control DB.

FB 61

SET_SW_S

TIMEFUNC supports the summertime/wintertime changeover in CPUs that do have the time status. For this purpose it sets the time status to the current time and according to the changeover rules in the Control DB.

FB 62

TIMESTMP TIMEFUNC transfers the time-stamped messages of an IM153-2 into its instance DB.

FC 60

LOC_TIME TIMEFUNC reads the time status or time of the CPU and calculates the local time. It is therefore only useful on CPUs with time status.

FC 61

BT_LT

TIMEFUNC calculates the local time from the base time given at the input.

FC 62

LT_BT

TIMEFUNC calculates the base time from the local time given at the input.

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FC 63

S_LTINT


TIMEFUNC sets the required time interrupt to the preset time. This time is given in local time.

Siemens Technical Terms Otherwise known as Siemens speak. Here's a list of Siemens specific abbreviations and their meanings.

Term

Description

Explanation

C7

Combo PLC/HMI system

A PLC and screen in one package

CFC

Continuous Function Chart

Optional programming language

CP

Communication Processor

Modules used for special communication protocols

DB

Data Block

Memory storage areas for user data

FB

Function Block

A function with it's own data block

FBD

Function Block Diagram

Standard programming language

FC

Function Call

Called progammed blocks

FM

Function Module

Modules with special functions (e.g. positioning)

GSD

Generic Station Description Files used for Profibus descriptions

HiGraph


IM

Interface Module

Modules to connect remote racks

LAD

Ladder Logic Diagram

Standard programming language

M7

Programmable modules

A module with processing capabilities

MMC

Micro Memory Card

Compact plug-in memory card

MPI

Multi Point Interface

Standard communication protocol

OB

Organization Block

Blocks for user programs based on different operating system events.

OP

Operator Panel

Simple display with or without buttons

PCS

Process Control System

Software for the entire process chain

PG

Programming Terminal

Dedicated Siemens device - basically a PC

PPI

Point to Point Interface

Serial RS-232 communication

Profibus DP

Profibus Decentral Peripherals

Networking protocol used for factory automation

Profibus PA

Profibus Process Automation

Networking protocol used for process automation

S7 SCL

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SIMATIC Step 7 product line Structured Control Language


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SFB

System Function Block

Integrated FB for CPU information

SFC

System Function Call

Integrated FC for CPU information

SM

Signal Module

Standard Input/Output modules

STL

Statement List

Text based programming language

TP

Touch Panel

Touch screen display

UDT

User-Definded Data Type

Special data structures defined by the user

VAT

Variable Access Table

Tables used to monitor/modify values in the PLC

Step 7 Elementary Data Types Type and Description

Example in STL

1 Boolean text

TRUE/FALSE

TRUE

BYTE (Byte)

8 Hexadecimal number

B#16#0 to B#16#FF

L B#16#10 L byte#16#10

2#0 to 2#1111_1111_1111_1111

L 2#0001_0000_0000_0000

Hexadecimal number

W#16#0 to W#16#FFFF

L W#16#1000 L word#16#1000

BCD

C#0 to C#999

L C#998

Decimal number unsigned

B#(0,0) to B#(255,255)

L B#(10,20) L byte#(10,20)

DWORD (Double word)

8

Range and Number Notation (lowest to highest values)

BOOL (Bit)

WORD (Word)

39

Size Format in Options Bits

16 Binary number

32 Binary number

2#0 to 2#1111_1111_1111_1111_ 1111_1111_1111_1111

L 2#1000_0001_0001_1000_ 1011_1011_0111_1111

Hexadecimal number

W#16#0000_0000 to W#16#FFFF_FFFF

L DW#16#00A2_1234 L dword#16#00A2_1234

Decimal number unsigned

B#(0,0,0,0) to B#(255,255,255,255)

L B#(1, 14, 100, 120) L byte#(1,14,100,120)

INT (Integer)

16 Decimal number signed

-32768 to 32767

L 101

DINT (Double integer)

32 Decimal number signed

L#-2147483648 to L#2147483647

L L#101

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REAL (Floating-point number)

32 IEEE Upper limit +/-3.402823e+38 Floating-point Lower limit +/-1.175495e-38 number

L 1.234567e+13

S5TIME (SIMATIC time)

16 S7 time in S5T#0H_0M_0S_10MS to steps of 10ms S5T#2H_46M_30S_0MS and (default) S5T#0H_0M_0S_0MS

L S5T#0H_1M_0S_0MS L S5TIME#0H_1H_1M_0S_0MS

TIME (IEC time)

32 IEC time in T#24D_20H_31M_23S_648MS L T#0D_1H_1M_0S_0MS steps of 1 ms, to L TIME#0D_1H_1M_0S_0MS integer signed T#24D_20H_31M_23S_647MS

DATE (IEC date)

16 IEC date in D#1990-1-1 to steps of 1 day D#2168-12-31

L D#1996-3-15 L DATE#1996-3-15

TIME _OF_DAY (Time)

32 Time in steps of 1 ms

TOD#0:0:0.0 to TOD#23:59:59.999

L TOD#1:10:3.3 L TIME_OF_DAY#1:10:3.3

A', 'B' etc.

L 'E'

CHAR (Character)

8 ASCII characters

S5TIME NOTES

Underscores in time and date a re optional It is not required to specify all time units (for example: T#5h10s is valid) Maximum time value = 9,990 seconds or 2H_46M_30S S5TIME Format

Time base Binary Code 10 ms

00

100 ms

01

1s

10

10 s

11

Symbol Table Allowed Addresses and Data 40

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Types English German Description Mnemonics Mnemonics

Data Type

Address Range

I/O Signals

I

E

Input bit

BOOL

0 to 65535.7

IB

EB

Input byte

BYTE, CHAR

0 to 65535

IW

EW

Input word

WORD, INT, S5TIME, DATE

0 to 65534

ID

ED

Input double word

DWORD, DINT, REAL, TOD, TIME

0 to 65532

Q

A

Output bit

BOOL

0 to 65535.7

QB

AB

Output byte

BYTE, CHAR

0 to 65535

QW

AW

Output word


0 to 65534

QD

AD

Output double word


0 to 65532

Marker Memory

M

M

Memory bit

BOOL

0 to 65535.7

MB

MB

Memory byte

BYTE, CHAR

0 to 65535

MW

MW

Memory word


0 to 65534

MD

MD

Memory double word


0 to 65532

Peripheral I/O

PIB

PEB

Peripheral input byte

BYTE, CHAR

0 to 65535

PIW

PEW

Peripheral input word


0 to 65534

PID

PED

Peripheral input double word


0 to 65532

PQB

PAB

Peripheral output byte

BYTE, CHAR

0 to 65535

PQW

PAW

Peripheral output word


0 to 65534

PQD

PAD

Peripheral output double word


0 to 65532

Timers and Counters

41

8

T

T

Timer

TIMER

0 to 65535

C

Z

Counter

COUNTER

0 to 65535

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Logic Blocks

FB

FB

Function block

FB

0 to 65535

OB

OB

Organization block

OB

1 to 65535

FC

FC

Function

FC

0 to 65535

SFB

SFB

System function block

SFB

0 to 65535

SFC

SFC

System function

SFC

0 to 65535

DB

Data block

DB, FB, SFB, UDT

1 to 65535

User-defined data type

UDT

0 to 65535

Data Blocks

DB

User-defined data types

UDT

UDT

Siemens S7 Indirect Addressing by Automation Training The following is provided by Automation Training from their excellent Siemens Step 7 training manual. This is a really nice explanation of a difficult but important subject. Chec k out their website for hands-on and online training classes.

Introduction The most common form of addressing used in the Siemens S7 PLCs is direct and symbolic. When a direct addressed is referenced by an instruction there is no question as to the location in memory. The following are examples of direct addressing:

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Inputs:

I4.0, IB4, IW4 , ID4

Outputs:

Q124.0, QB124, QW124, QD124

Markers:

M11.0, MB10, MW10, MD10

Timers:

T34

Counters:

C23

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Local:

L0.0, LB1, LW2, LD4

Data Block:

DB5.DBX2.0, DB5.DBW6, DBD8

By using the methods of indirect addressing the address used by an instruction can be varied to point to any number of locations. In this case, a memory location stores a “ pointer” to another memory location. While this may increase the difficulty of troubleshooting, its advantage is to greatly reduce the number of networks and instructions needed to control a proc ess. It is also a method that must be understood to use some of the library and system function calls provided by Siemens.

The POINTER and ANY Data Types A POINTER data type is used to format a number to be accepted as an address rather then a value. A pointer is always preceded by a P# symbol. The pointer address may be in three different formats.

Format

Example

Memory Storage

P#.

P#8.0 P#124.3

4 Bytes

P#.

P#M50.0 P#I4.0

6 Bytes

P#.

P#DB25.DBX0.0 BYTE 14 P#M0.0 WORD 2 P#I0.0 DWORD 5

10 Bytes

The ANY data type is used to pass a parameter of an unknown or undefined data t ype. Some functions in the library use the ANY data type to work on whole sections of memory. To do this, the last pointer method is used to describe an area. For e xample the address P#DB25.DBX 0.0 Byte 14 points to the first byte of DB25 with a length of 14 bytes.

NOTE: A DINT can be converted to a POINTER by simply shif ting the double word left by 3 bits.

Data Block Instructions When working with indirect addressing it is sometimes needed to first of all open a DB and then begin working on the address without directly referring to any one DB. This is done using the OPN instruction. The OPN instruction can open either a shared data block (DB) or an instance data block (DI).

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OPN

DB

10

//Open DB10 as a shared data block

L

DBW

36

//Load data word 36 of DB10 into ACCU1

T

MW

22

//Transfer the contents of ACCU1 into MW22

OPN

DI

20

//Open DB20 as an instance data block

L

DIB

12

//Load data byte 12 from DB20 into ACCU1

T

DBB

37

//Transfer the contents of ACCU1 to data //byte 37 of the open shared data block DB10

When monitoring in STL the shared DB number is displayed in the DB1 column and the instance DB number is displayed in the DB2 column. Furthermore, there are instructions to confirm that the correct DB number is opened and that it is large enough for the next operation.

L

DBNO

//Loads the number of the opened //shared data block into ACCU1

L

DBLG

//Loads the length of the opened //shared data block into ACCU1

L

DINO

//Loads the number of the opened //instance data block into ACCU1

L

DILG

//Loads the length of the opened //instance data block into ACCU1

Memory Indirect Addressing The first method of indirect addressing is called memory indirect addressing because it allows for a memory location (M, DB or L) to determine or point to another. The memory area identifiers T, C, DB, DI, FB and FC use a word (16-bit) pointer location in integer format. Two examples are as follows:

L

5

//Load ACCU1 with pointer value

T

MW

L

T [MW 2]

//Load ACCU1 with T5 current time value

OPN

DB [#DB_Temp]

//Open DB whose data block number is //from the interface temp parameter //named DB_Temp

2

//Transfer pointer into MW2

The memory area identifiers I, Q, M, L, DB use a double word (32-bit) location using the POINTER data type.

L

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P#0.7


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2


T

MD

//Transfer pointer into MD2

A

I [MD 2]

//Check state of I0.7

=

M [MD 2]

//Assign value of RLO to M0.7

OPN

DB

L

P#2.0

//Load pointer into ACCU1

T

#TempPointer

//Transfer pointer to temp location

L

DBW [#TempPointer]

//Load the value at DB5.DBW2 into ACCU1

L

0

//Load a zero into ACCU1

5

//Open DB5

>D

//Check if the value is greater //then zero

When monitoring memory indirect addressing the INDIRECT column displays the current address the instruction is using. Note that math can be done on the POINTER data t ype using the double math instructions (e.g. P#2.0 + P#5.0 = P#7.0).

L

P#2.0


L

P#5.0

//Load ACCU1 with secondpointer value

+D T

MD

0

//MD0 now contains the value P#7.0

Since the bit position only goes to eight the result of P#8.7 + P#1.1 = P#10.0 and not P#9.8. These methods can be used to offset the address or increase/decrease the pointer in a loop.

The Address Registers Besides the regular accumulators, there are two 32-bit address registers (AR1, AR2) for storing pointers used in register indirect addressing methods. A series of different load and transfer type instructions can be used to work with AR1. A similar set is available for AR2.

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8

STL

Description

LAR1

Loads AR1 with the contents of ACCU1

LAR1 P#M100.0

Loads AR1 with a pointer constant

LAR1 MD24

Loads AR1 with the pointer in MD24

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LAR1 AR2

Loads AR1 with the contents of AR2

TAR1

Transfers the contents AR1 into ACCU1

TAR1 MD28

Transfers the contents in AR1 to a memory location

TAR1 AR2

Transfers the contents in AR1 to AR2

CAR

Exchanges the contents of AR1 with AR2

Addition can be directly accomplished on AR1 and AR2 with the following:

STL

Description

+AR1

Adds the contents of ACCU1 to AR1 and stores the result back into AR1

+AR1 P#100.0

Adds the pointer constant to AR1 and stores the result back into AR1

Area-Internal Register Indirect Addressing The area-internal register indirect addressing method uses one of the address registers plus a pointer to determine the address the instruction is to reference. The format is: address identifier [address register, pointer]

The address identifier can be I, Q, M, L, DI or DB in bit, byte, word or double word form. The address register must be previously loaded with a double word pointer without referenc e to the address identifier. The exact address is determined by adding the address register with the pointer. The example below shows the area-internal method using bit locations.

L

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P#0.7


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LAR1


//Load AR1 with pointer in ACCU1

A

I [AR1, P#0.0]

//Check input I0.7

=

Q [AR1, P#1.1]

//If RLO=1 turn on Q2.0

Area-Crossing Register Indirect Addressing Area-crossing register indirect addressing is similar to the area-internal method except the pointer loaded into the address register references a memory area (e.g. P# M10.0 or P# DBX0.0). This means the address identifier used before t he opening bracket is not needed if referencing a bit otherwise it will be a B for byte, W for word or D for double. The example below shows the area-c rossing method using bit locations.

L

P#I0.7


LAR1 L

//Load AR1 with pointer in ACCU1 P#Q124.0


LAR2


A

[AR1, P#0.0]

//Check input I0.7

=

[AR2, P#1.1]

//If RLO=1 turn on Q125.1

This next example shows area-crossing methods using a word and double word format.

L

P#M0.0


LAR1


L

W [AR1, P#10.0]

//Load the word whose address is //determined by the contents of //AR1 plus 10 bytes (MW10) into ACCU1

OPN

DB

//Open DB5

L

P#DBX 0.0

5


LAR2


L

L#0

//Load zero into ACCU1

T

D [AR2, P#50.0]

//Transfer the value in ACCU1 to the //double word whose exact location is //the address in AR2 plus 50 bytes //(DB5.DBD50)

Exercise #1 1. Comment the lines of STL below to describe what this network does:

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8

A

I

JC

M001

0.0

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L

P#M10.0

JU

M002

M001:

L

P#Q0.0

M002:

LAR1


A

I

0.1

=

[AR1, P#0.1]

2. Enter the code, monitor it and verify your answers.

Exercise #2 (Advanced) 1. Create a DB with an array of 10 real numbers. Populate the array with random values. 2. Create a function that will return the max number in the array and its position. Use the indirect addressing method of your choice.

Siemens S7 Status Word In Siemens PLCs the Status Word is an internal CPU register used to keep track of the state of the instructions as they are being processed. In order to use STL more effectively it is important to understand the Status Word and its functions. Each bit in the Status Word has a specific function to keep track of bit logic (RLO, STA), math (OV, OS), comparison operations (CC0, CC1) and whether the logic should continue, be nested or start new (/FC, OR, BR). Only the first 9 of the 16 bits are used. Bit Positions

8

7

6

5

4

3

2

1

0

BR

CC0

CC1

OV

OS

OR

STA

RLO

/FC

Each instruction may do the following to each bit in the status word.

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8

-

No read or write

*

Read

x

May write "1" or "0"

0

Reset to "0"

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1


Set to "1"

The status word can be seen by displaying the STATUS column while monitoring in STL view. The RLO (bit 1) and the STA (bit 2) are also displayed in the RLO and STA column.

The Most Important Status Word Bits /FC – First Check (bit 0)

If the /FC bit is a 0 then the instruction is considered to be the first instruction being processed. If the /FC is a 1 then the instruction being scanned will use the logic from the previous instruction. Certain instructions like =, S and R will set the /FC bit to 0 thus starting new logic after it. Other instructions like A or O will set the /FC bit to 1 signalling to combine the logic with the next instruction. RLO – Result of Logic Operation (bit 1)

The RLO bit stores the running logic state of the currently processing instructions. Certain bit logic and comparison instruction will turn the RLO to a 1 when the condition is TRUE and write a 0 when t he condition is FALSE. Other instructions read the RLO (=, S, R) to determine how they are to execute. STA – Status (bit 2)

The STA bit reflects the state of the current Boolean address. Help with RLO, STA and /FC

If you are used to ladder logic and struggling to understand the purpose of the RLO and STA it may help to visualize a rung like below. The STA is used to keep track of the sta te of the addresses. The RLO is used to keep track of the state of the rung.

The equivalent STL is shown below.

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It steps through the logic as follows: 1. At the start the First Check bit (/FC) is zero so an And instruction will logically mirror the Status bit (STA) over to the Result of Logic Operation (RLO). In this case the a ddress I0.0 is 1 so the STA is one and the result of the logic (RLO) will be 1. The A instruction writes a 1 to /FC.

2. On the second line, the /FC bit is now 1 indicating that this line needs to use the RLO from the previous line. The address I1.1 is on so the STA = 1. The RLO from the last line is 1 and this is ‘anded’ with the current STA with a result of 1 in the current RLO.

3. The same thing happens on the second line but this time 1 and 0 makes the curre nt RLO = 0.

4. The fourth is the Assign instruction which takes the RLO and writes it out to the corresponding address. In this case the final RLO = 0 so the output will be off. If M0.0 was 1 then the “And” operation will evaluate to true making the RLO = 1 which will then turn on t he output Q1.0.

The Other Status Bits OR (bit 3)

The OR bit is used for combining AND functions before OR functions. OS – Overflow Stored (bit 4)

In the event of an overflow (OV bit 5) the OS bit will store the value even after the OV bit has been reset. The following commands reset the OS bit: JOS (Jump if OS=1), block call instructions, block end

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instructions. OV – Overflow (bit 5)

The OV bit is set by a math instruction with floating point numbers after a fault has occurred (overflow, illegal operation, comparison unordered). The OV bit is reset when the fault is eliminated. CC0, CC1 – Condition Code (bits 6 and 7)

The Condition Code bits provide results for comparison and math instructions. Comparison Instructions

CC 1

CC 0

Meaning

0

0

ACCU 2 = ACCU 1

0

1

ACCU 2 < ACCU 1

1

0

ACCU 2 > ACCU 1

1

1

Unordered (floating point comparison only)

Math Instructions, without Overflow

CC 1

CC 0

Meaning

0

0

Result = 0

0

1

Result < 0

1

0

Result > 0

Integer Math Instructions, with Overflow

1

8

CC 1

CC 0

Meaning

0

0

Negative range overflow in ADD_I and ADD_DI

0

1

Negative range overflow in MUL_I and MUL_DI

1

0

Negative range overflow in ADD_I, ADD_DI, SUB_I, and SUB_DI

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1

1


Division by 0 in DIV_I, DIV_DI, and MOD_DI

Floating Point Math Instructions, with Overflow

CC 1

CC 0

Meaning

0

0

Gradual underflow

0

1

Negative range overflow

1

0

Positive range overflow

1

1

Not a valid floating-point number

Shift and Rotate Instructions

CC 1

CC 0

Meaning

0

0

Bit shifted out = 0

1

0

Bit shifted out = 1

Word Logic Instructions CC 1

CC 0

Meaning

0

0

Result = 0

1

0

Result <> 0

BR – Binary Result (bit 8)

The Binary Result transfers the result of the operations onto the next instruction for reference. When the BR bit is 1 it enables the output of the block (ENO) to be TRUE and thus allow other blocks after it to be processed. The SAVE, JCB and JNB instructions set the BR bit.

Statement List (STL) Cheat Sheets If you are a Siemens PLC user then you've more then likely have run into Statement List (STL) programming. STL corresponds to the Instruction List language defined in the IEC 61131-3

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specification. The programming is done with very simple mnemonics that can be hard to remember if you don't use it very often. These cheat sheets provide a quick reference guide for all the instructions and formatting. They are two pages long but if you can print on the front and back then they make for a nice one sheet reference.

STL Listed Alphabetically Best used when trying to interpret an existing program. Download: PDF (131KB)

STL Listed by Category Best when doing programming. Download: PDF (140KB)

Connecting IFIX SCADA to Siemens S7 using TCP/IP Setting up an S7 connection using TCP/IP The TCP/IP method of communication to the S7-300 and S7-400 PLC's via TCP/IP communication module uses the S7WIN, S7WINSP, S7NT, or S7NTSP protocol.

Software requirements Siemens SIMATIC NET software v6.1 SOFTNET-S7 Industrial Ethernet

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IFIXSCADA v5.x or above Windows XP + SP1

Hardware requirements Standard network card S7-300 with CPU315-2 DP Siemens power supply PS30/5A Siemens CP343-1 TCP The hardware modules occupy the following slots in the Siemens PLC: 1. Siemens power supply 2. S7-300 CPU 315-2 DP 3. Ethernet CP343-1 TCP

Example configuration All wiring should be installed according to Siemens documentation.

Installing the SIMATIC NET software You must log in as an Administrator to install the SIMATIC NET software. Close all other running applications, including any antivirus software you may be running. 1. On the SIMATIC NET flash screen, start the installation by clicking Install SIMATIC NET Software. 2. The PC configuration screen appea rs. Click Next. 3. Select the English language option, then click Next. Click Next again. 4. Click yes to the licensing agreement screen. 5. Enter your Name and Company on the User Registration screen. 6. If you already have SIMATIC NET software installed, this will be the drive selected by default. Clear the Run automatic authorization option, and then click next. The Setup: Configuration screen appears. 7. Select all application options to be installed. (This is necessary if you do not already have STEP7 installed on your machine. If STEP7 v5.2 or higher is already installed, you do not have to select the NCM PC/S7 v5.2 application.) Click Next. 8. The applications you selected are installed. At the prompt, click OK to restart your system. The system restarts and installs the selected applications. Click Finish to restart your system again. The SIMATIC NET software is now installed.

Configuring the SIMATIC NET software This step involves using the Commissioning Wizard to configure the software you installed in the previous step.

Configuring the module When your system restarts after the software has been installed, your system's hardware configuration is scanned. The Commissioning Wizard appears automatically. (You can also access the Commissioning Wizard at Start/Simatic/SIMATIC NET/Settings/Commissioning Wizard.) The number of steps required depends on the number of PC Ethe rnet cards (or modules) detected in

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your PC. The more modules you operate in the computer, the more steps are required. 1. Click Next. An Ethernet Network Card with with the IP addresses settings shown above was found. This is the network card that will be configured for communication with the Siemens PLC. This is put on index 5. Note: The index of the network card can be set with the NCM PC Configuration (hardware configuration). The station index defaults to 5 if you use the Commissioning Wizard. 2. Select the Use the module for productive operation in configured PC station option, and then click next. 3. Clear the SIMATIC NET OPC Server in configured PC Station option and select the Configure more applications option. Then click next. 4. Register the names for your user application: enter VFD1 in the Name text box. This user application is put on index 1. Click Next. Note: The name of the application is the VFD name. This comes later in the IFIX Project Editor under Communication | Ports in the Special options text box. 5. Click Next. This screen appears, confirming you have completed configuring the module: 6. The configuration is saved and the PC station is reconfigured. Your existing configuration data is overwritten. Click OK to confirm at the prompt. This completes the module configuration.

Configuring the project with the PC Station Wizard The next step to configure the project using the PC Station Wizard. 1. Start the PC Station Wizard. 2. Choose Create a new project and configuration. A new project is created. Click Next. 3. Define a new Project name ; this example uses IFIXS7. Specify where the copy of the local PC station settings resides, and then click Next. 4. Select the Edit network and connection configuration option, and then click Finish. NetPro automatically starts, displaying the network configuration. 5. Click the Application box in the PC station, and then c hoose Insert | New Connection. The Insert New Connection dialog box appears. 6. Choose the Unspecified item in the tree. From the Type menu in the Connection area, choose S7 connection. Then click Apply, and then click OK . 7. In the Properties -S7-Connection dialog box, the local IP Address should be the address of the Ethernet card in the PC. This example uses 192.168.0.190. The partner IP Address should be that of the Ethernet CP343 module in the PLC, in this case 192.168.0.148. The Local ID is the connection identifier of this connection (here it is S7-Connection_1). It will be used later on a s the address of the IFIX I/O device. Click Address Details. Note: The Local ID S7-Connection_1 is used later in the IFIX Project Editor under Communication | I/O Devices in the I/O Device Address text box. This name is case-sensitive and cannot not contain any spaces. 8. In the Address Details dialog box, enter the card location of the CPU that the SIMATIC S7 communicates with. Here the card location is 2. Click OK . Note: Some power supplies might occupy 2 slots. If so, the card location of the CPU is one higher at 3.

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9. In the NetPro window the new S7-Connection_1 connection appe ars. Choose Network | Save and Compile. The Save and Compile dialog box appears. 10. Select the Compile and check everything option, and then click OK . 11. After completing the save and compile operation, a message appears in the Ne tPro window. This indicates the warnings and errors present in the configuration. If warnings occur here , then this is to be handled as information only. But if errors occur, the project configuration cannot be loaded. To view errors, choose View |Outputs. 12. Highlight by clicking on the PC Station (TESTXP). Afterwards the connection table disappears in the message window. From the NetPro menu choose PLC | Download | Selected Stations to transfer the project configuration to the PC. Alternat ively, right-click the PC Station and choose Download | Selected Stations. 13. To confirm the overwrite of configuration data and to proceed with the download, click Yes. 14. To confirm stopping the Target Module (Network interface Card), click OK . 15. The configuration should now be successfully loaded. Exit NetP ro and click next, and next again to finish the Commissioning Wizard. If you have errors, see for details.

Defining an access point for the application The next step is to define an access point for the application. 1. The Configuration Console should appear after terminating the Commissioning Wizard. If it doesn't, open the Configuration Console by selecting START / SIMATIC / Simatic Net / Settings / Configuration Console. 2. In the Configuration Console dialog box, right-click the Access Point object, and choose New | New access point. Note: You can choose any name for the Access point, but it cannot c ontain spaces and be longer than 32 characters. 3. In the New access point dialog box, enter your access point name (this example uses IFIXS7). Select the hardware component that will be associated with this access point (TCP/IP -> ASUSTeK/Broadcom 440x in the example). Note: The access point name is used later in IFIXSCADA in the Project Editor under Communication | Boards in the Special Options text box. The access point name is case-sensitive. After creating the a ccess point the Configuration Console should look like this: 4. Close the Configuration Console. This completes the Simatic NET software configuration.

Configuring the S7 driver The IFIX S7 driver needs three names (settings) from the SIMATIC NET software configuration. The following points are needed: SIMATIC NET

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Configuration example

IFIX Info

Access point of the application

IFIXS7

Boards, Special options Field

VFD/Application Name

VFD1

Ports, Special options Field

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Name of the connection (or Local S7-Connection_1 IODevices, Address Field ID)

Using the Express Wizard You use the Express Wizard to configure your communications. 1. In IFIX Explorer, create a new (empty) test project. 2. In the IFIXSCADA Project Editor, choose Communication | Express Wizard. 3. In the wizard: Create a new I/O Servers e.g. IOServer . Create a new I/O Device e.g. IODev. Select external as the type of the I/O Device (PLC): Select the Siemens | S7-300 or S7-400| TCPIP using NE2000 network CARD for Windows NT for NT/W2K/XP/2003 , or the TCPIP using NE2000 network CARD for Windows 95/98 for 95/98/ME option. 4. Define the name of the connection. In this example it is S7-Connection_1 . Note: Do not select the Link I/O Device to an external tag Database option. This completes this section.

Setting the Access Point The next step in the process is to set the access point of the application. 1. Open the Boards dialog box by choosing Communication | Boards. 2. In the Special Opt text box, enter the access point of the application. This example uses IFIXS7.

Setting the VFD name The next step is to set the VFD name. 1. Open the Ports dialog box by choosing Communication | Ports. 2. In the Special Opt text box enter the VFD Name. In this case VFD1.

Checking the name of the S7 connection The next step is to check the name of the S7 connection. 1. Open the I/O Device dialog box by choosing Communication | I/O Devices. 2. In the Address field enter the name of the connection to the PLC. This example uses S7-Connection_1 .

Variable declaration The next step is to declare the variables. 1. Open the Tags Form by choosing Tags | Variable Tags. 2. Create a variable with the following information: Variable Tag Name: TestInteger I/O Device Name: IODev Type: INT Address: DB190,0

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Siemens SIMATIC Step 7 Programmer's Handbook

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