09_CP342-5-DP-Master

Automation and Drives

CP342-5 DP as PROFIBUS DP master

SITRAIN IK-PBSYS / DP Master CP342-5 DP

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Co n t en t s

03/2007 © Siemens AG 2007 - Subject to change without prior notice

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Differences Differences between between the CP342-5 CP342-5 and the integral integral DP interface interface ............ .................. ............ ............ ............ ............ ............ ........... ....... ..

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Basic procedure procedure

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Configuring Configuring with STEP 7

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Properties Properties of CP 342-5 DP: General General .......... ............... ........... ........... .......... .......... .......... ........... ............ ........... ........... ........... .......... .......... .......... .......... ........... ......... ...

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Characterist Characteristics ics of the PROFIBUS PROFIBUS DP network network ........... ................. ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... ........... .......... .....

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Propert Properties ies of CP 342-5 342-5 DP: DP: Address Addresses es

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Properties Properties of CP 342-5 DP: DPM operating operating mode ........... ................ .......... .......... .......... .......... ........... ............ ........... .......... .......... .......... .......... ........ ...

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Properties Properties of CP 342-5 DP: Options Options ........... ................ ........... ............ .......... .......... ........... .......... .......... .......... ........... ........... .......... .......... .......... .......... ........... ......... ... CP 342-5 342-5 DP DP (master (master statio station n without without slaves) slaves) ........... ................ .......... .......... ........... ............ ........... .......... .......... ........... ........... .......... .......... ........... .......... ....

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Data exchange: exchange: DP master master and CPU (1) ........... ................ ........... ............ .......... .......... ........... .......... .......... .......... ........... ........... .......... .......... .......... .......... ........ ...

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Data exchan exchange: ge: DP master master and CPU CPU (2) ........... ................. ........... .......... .......... .......... ........... ........... .......... ........... ........... .......... ........... ........... .......... ........... ......

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Data exchange: exchange: DP master master and CPU (3)

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Data areas areas on the ET 200M 200M ........... ................ ........... ............ ........... .......... .......... .......... ........... ........... .......... .......... ........... ............ ............ ........... .......... .......... .......... ......... .... Data areas on the the ET 200S ........... ................ ........... ............ ........... .......... .......... .......... ........... ........... .......... .......... ........... ............ ............ ........... .......... .......... .......... ......... ....

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Exercise 1: 1: Configu Configure re the the CP342-5 CP342-5 DP as as a DPM .......... ................ ........... .......... .......... .......... ........... ............ ........... .......... .......... .......... .......... ........ ...

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Exercise 2: 2: Configure Configure the ET200M ET200M and ET200S ET200S ........... ................. ........... .......... .......... .......... ........... ........... .......... .......... .......... .......... ........... ........... .....

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Exercise 3: 3: Program Program a data exchange exchange

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SITRAIN trainin training g for Automation and Industrial Solutions

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IK-PBSYS DP master master CP342-5 CP342-5 DP


Differences between the CP342-5 and the integral DP interface


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Differences

In relation to configuring and programming, the CP342-5 is fundamentally different to the DP interfaces integrated in S7 CPUs, the CP443-5 extended and the IM modules of the AS400.

Configuration

The DP master system is set up when the CP is configured and not when the CPU is configured. The IO areas of the DP slaves configured during this process are not IO areas of the CPU, but merely mailboxes of the DP master.

Programming

The CP342-5 does not simulate IO areas. In other words, the CPU does not "see" the IO areas configured for the master system and consequently does not automatically transfer data to the process image areas. This data exchange must be explicitly programmed in the S7 program using the two blocks FC1 "DP_SEND" and FC2 "DP_RECV" from the library SIMATIC_NET_CP.

Data consistency

Using blocks FC1 and FC2 always ensures automatic data consistency, regardless of the number of IO bytes transferred.

Perfor mance p arameters There are no longer any differences in the data volume of the maximum possible baud rate with the later versions of the CP342-5 (see Equipment Manual).

SITRAIN training for Automation and Industrial Solutions

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IK-PBSYS DP master CP342-5 DP


Basic procedure

Configuring CP 342-5 DP


Configuration

Use of library blocks

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1.Configure the DP master system, i.e. specify the DP master and associated DP slaves in the configuration table. 2.Assign the DP master system parameters (IO addresses, groups, etc).

S7 program

You program the user program in the S7-CPU : 1.Exchange of data between the DP master and CPU. Blocks FC1 "DP_SEND" and FC2 "DP_RECV" are used for this purpose. 2.Functional processing of IO data from DP slaves in the S7 program. 3.Detection of slave faults by programmed diagnostic routines, i.e. in contrast to the integrated inter face, faults are not automatically detected OB86) if a slave fails. For this purpose, another block FC3 "DP_DIAG" in the S7 program must be used.

Library

The functions described here (blocks of type FC) plus the STEP 7 basic package and the loadable option NCM S7 for PROFIBUS are all supplied as a library. Instructions on how to use these blocks can be found below.


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Configuring with STEP 7


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Properties

You open the properties dialog of the CP 342-5 by double clicking on the CP module.

"General" tab

The "General" tab specifies the type and location of the module as well as information relevant to the network in the case of modules with interfaces, e.g. the node address. You will also find information in this tab sheet regarding the STEP 7 project in which the relevant module is integrated.

Short descript ion, order number/firmware, name The short description, the information below it and the order number/firmware are identical to the data in the "Hardware catalog" window. The "Name" field contains the short description of the module that you can change according to your information. When you change the description, the new description is displayed in SIMATIC Manager. Interface

You configure the PROFIBUS address and the assignment to a PROFIBUS subnet of the CP in this field. You can edit the properties of the subnet by clicking on theProperties button (see following page).

Backplane bus

AS300 modules have an independent MPI address for ONLINE access. This can be adjusted in the MPI address field. The default setting is the next higher value from the CPU MPI address. If this station is operated on an MPI network on which the default address setting has already been assigned ( second CPU), then the default value must be changed on this tab.


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Properties of CP 342-5 DP: General


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Interface

Click on the Properties button on the General tab to enter settings for the subnet.

Network s ettings

You can change the PROFIBUS address and select the PROFIBUS subnet to which the interface of the node is connected.

Subnet

This field specifies the PROFIBUS subnet via which the node is networked. Select either an existing (previously configured subnet), or

New...

click the "New" button if you want to create another PROFIBUS subnet.

Delete

If you want to delete a subnet, select it and click on the Delete button. The subnet is deleted but not the nodes. You can connect the nodes of a previous subnet to another subnet.

Address

If you assign the subnet before you configure the bus address, you will automatically avoid duplicate address assignments because STEP7 will now "know" the addresses already used on the assigned subnet. The transmission rate set and the "highest address“ are displayed for information purposes (can be changed by clicking the "Properties" button).

Properties

Click on the Properties button if you want to display or edit the properties of the selected subnet. Apart from the bus address itself, the main properties of a subnet includes the baud rate, the profile and other data required to calculate internal bus parameters.


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Characteristics of the PROFIBUS DP network Network configuration Copper or fiber optic cables


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Network s ettings

You can change the PROFIBUS address and select the PROFIBUS subnet to which the interface of the node is connected.

Subnet

This field specifies the PROFIBUS subnet via which the node is networked. Select either an existing (previously configured subnet), or

New...

click the New button if you want to create another PROFIBUS subnet.

Delete

If you want to delete a subnet, select it and click on the Delete button. The subnet is deleted but not the nodes. You can connect the nodes of a previous subnet to another subnet.

Address

If you assign the subnet before you configure the bus address, you will automatically avoid duplicate address assignments because STEP7 will now "know" the addresses already used on the assigned subnet. The transmission rate set and the "highest address“ are displayed for information purposes (can be changed by clicking the "Properties" button).

Properties

Click on the Properties button if you want to display or edit the properties of the selected subnet. Apart from the bus address itself, the main properties of a subnet include the baud rate, the profile and information about other network components, such as cable lengths, optical element, etc. which are required to calculate internal bus parameters.


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Properties of CP 342-5 DP: Addresses

The "CPLADDR " parameter of DP_SEND must be entered in Hex: CPLAADR:=w#16#130

The "CPLADDR " parameter of DP_RECV must be entered in Hex: CPLAADR:=w#16#130


Addresses tab

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This value is passed as parameter CPLADDR to blocks FC1 "DP_SEND" and FC2 "DP_RECV" in the S7 program. It specifies the address which can be used to access the CP342-5 via the backplane bus. This address is dependent on the CP slot and is calculated in exactly the same way, for example, as the address of an analog module: CPLADDR:= [(STPL - 4) * 16] + 256 This formula is automatically applied when the box System selection is checked. When this box is unchecked, any address value can be input, but it should be outside the PII and PIO areas.

Example


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Properties of CP 342-5 DP: DPM operating mode


Operating modes

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The CP342-5 can be operated in three different modes. - No DP

The CP342-5 is used only for the FDL protoc ol, i.e. it is neither a DP master nor a DP slave (default setting). Via the FDL protocol, for example, it can exchange data with an S5 control.

- DP master The CP generally operates in this mode. The module is the DP master, i.e. the entire DP master system is configured on this CP. - DP slave

The CP342-5 is operated as a DP slave. It is then coupled to a master system as a "configured station". If the CP must also be capable of using the STEP7 ONLINE access, the box Module is active node on PROFIBUS subnet must be checked.

DP delay ti me

The start of the next DP cycle in each case is delayed by the value configured here. Within this time period, the CP can exchange data via the S7 protocol (STEP7 online) and/or the FDL protocol. The DP data exchange is "braked" by this delay period.


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Properties of CP 342-5 DP: Options


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Module replacement without PG With this option, you can specify that the CP configuration data should be stored in the CPU. When the CP is replaced, its configuration data are automatically downloaded from the CPU when the CP is started up. Select this option to specify fail-safe long-term data storage in the CPU rather than in the EEPROM of the CP. However, note that even on the CPU, fail-safe long-term storage is only ensured to the extent that the CPU is protected against power failure with a battery backup or an S7 Memory Card. Supplementary note about downl oading configuri ng data Whenever you change this option, you must always download the configuration data for the complete S7 station and not just the configuration data for the CP whose parameters you have modified here! Multiplex OP connections / assign internal CPU connection resource In order to connect TD/OPs or HMI devices, you can optimize the connection resources in the S7-300 CPU by enabling up to 16 of these units to communicate on a single CPU connection resource (multiplex operation). If you choose not to use this option, the number of TD/OPs or HMI devices which can be operated will depend on the number of available connection resources of the CPU used (see also CPU connection resources). The option is deactivated in the default setting. A CPU connection resource is therefore only reserved for multiplex mode where necessary.


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CP 342-5 DP (master station without slaves)

DP master mode


Result

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The master station is preconfigured and comprises a CPU 315-2 DP (without configured DP function) and a CP342-5 as the DP master.

Updating DP data areas Programmed FC block calls in the user program of the CPU are used to start transfer of the DP data areas to the PROFIBUS CP and to monitor successful execution. The position of the DP data area is specified in the call parameters of the FC blocks. FC blocks

The following blocks are made available for the S7 program in librarySIMATIC_ NET_CP: - FC1 "DP_SEND" This block transfers the entire DP output area from the CPU to the DP master (CP). - FC2 "DP_RECV" This block transfers the entire DP input area from the DP master (CP) to the CPU. - FC3 " DP_DIAG" This block enables the DP master to scan the diagnostic data of DP slaves. - FC4 " DP_CTRL" This block manages check functions for the distributed I/Os, such as Sync, Freeze, activate/deactivate slave, etc.

CPU cyc le

A possible processing sequence for the DP FC function blocks in combination with organization and program blocks in the CPU cycle is shown in the diagram above. The example shows a case in which, at the beginning of ever y CPU cycle, process data are read in and following execution of the user programs, the created output data are output to the process I/O. An independent diagnostic program is provided for DP slave monitoring.


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Data exchange: DP master and CPU (1) Slot

2 CPU 314

PII

4 32DI

PIQ

0

0

. . .

. . .

5

7

32D O PQB

CP342-5 DP master

4,5,6,7

PIB 0,1,2,3

DP IB

DP QB

0

0

. . . 2160

. . . 2160

127

127

Slave poll list

U I 8.0 UN I 1.3 = Q 8.5 L

IW 10


I/O areas

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ADR

I

4 8

2-5 0

Q

0


Unlike a CP with an integrated DP master interface or a CP443-5, the CP342-5 does not make any I/O areas available to the CPU. This means that the IO areas programmed with HW Config here have nothing to do with the IO address space on the CPU, in other words, they are "invisible" to the CPU. These address areas are presented as IO areas within the HW configuration merely to represent the functional aspect of the data exchange between the DP master and the DP slaves. The areas which access these I/Os from the viewpoint of STEP7 are not configured until the S7 program is created and cannot be identified in the DP master system configuration. Accordingly, no data are exchanged between the process images PII/PIO and the CPU. This data exchange must be programmed explicitly. The two blocks FC1 "DPSEND" and FC2 "DP-RECV" are provided for this purpose.

Advantages

There are some functional advantages to using these two functions: 1. Data are always transferred consistently, i.e. in one block, between the CPU and the DP master 2. In addition to process images, data blocks or bit memories can also be used as data areas on the CPU.


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4

2 CPU 314

PII

32DI

PIO

0

0

. . .

. . .

5

7

32D O PQB

CP342-5 DP master

4,5,6,7 PIB FC 2: DP-RECV 0,1,2,3

DP IB

DP QB

0

0

. . . 2160

. . . 2160

127

127

Slave poll list

U I 8.0 UN I 1.3 = Q 8.5 L

EW 10


ADR

I

4 8

2-5 0

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Q

0


Transfer of input signals of all DP slaves from DP master to CPU The input signals of the DP slaves are stored in the I area of the CP342-5. Block FC2 "DP-RECV" in the S7 program is used to transfer them from this area to the CPU. If FC2 is called cyclically in OB1, the data transfers are automatically synchronized with the S7 program. Alternatively, the data can be read to the CPU within a specific time frame by OB35. The destination area is specified in ANY format at parameterRECV of FC2. The source area always begins at address 0 in the I area of the CP342-5. The length is defined by parameter RECV. Rules

The following rules must be applied: 1.The CP always begins reading the data at the 1st byte (byte 0). 2.The data are always read out as a contiguous block i.e. if there are gaps between the assigned I bytes of the individual slaves, these bytes are still transferred to the CPU and written to the destination area (I byte 1 in our example). 3.If you add the I address configured in HW Config as an OFFSET to the start address of the destination area (parameter RECV of FC2), you obtain the input address to be used in the S7 program.

Example for ET200M

Values programmed in the hardware configuration: - EW 2 (1st analog channel) and EW 4 (second analog channel) - Parameter RECV on FC2 : P#E8.0 Byte 6:  


2 + 8 = 10 : EW10 for the 1st analog channel 4 + 8 = 12 : EW12 for the 2nd analog channel

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2 CPU 314

PII

4 32DI

PIQ

0

0

. . .

. . .

5

7

32D O PQB

CP342-5 DP master

4,5,6,7 PIB FC 1: DP-SEND 0,1,2,3

DP IB

DP QB

0

0

. . . 2160

. . . 2160

127

127

Slave poll list

U I 8.0 UN I 1.3 = Q 8.5 L

IW 10


ADR

I

4 8

2-5 0

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Q

0


Transfer of output signals of all DP slaves from CPU to DP master The output signals of the DP slaves must be transferred to the O area of the CP342-5 from the CPU. This is done using function FC1 "DP-SEND". If FC1 is called cyclically in OB1, the data transfers are automatically synchronized with the S7 program. Alternatively, the data can be written within a specific time frame by OB35. The destination area is specified in ANY format at parameterSEND of FC1. The destination area always begins at address 0 in the O area of the CP342-5. The length is defined by parameter SEND. The following rules must be applied: 1.Data are always written to the CP starting at byte 0. 2.The data are always transferred as a contiguous block i.e. if there are gaps between the assigned O bytes of the individual slaves, these bytes are still transferred from the CPU and written to the destination area (O byte 1 in our example). 3.If you add the I address configured in HW Config as an OFFSET to the start address of the destination area (parameter RECV of FC2), you obtain the input address to be used in the S7 program. Example for ET200S Value programmed in the hardware configuration: QB 0 - Parameter RECV on FC1 : P#Q8.0 Byte 1  0 + 8 = 8 : QB8


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Data areas on the ET 200M


ET200M

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The addresses set here (2 to 5) have no connection whatsoever to the address areas on the CPU, i.e. they are not used as address areas in the S7 program. They merely represent the source and destination areas for data exchanges with the CPU. However, the address value itself can also be used as an offset to the start value of the address for the source or destination area of the DP-SEND/DP-RECV blocks.


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Data areas on the ET 200S


Address areas

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The addresses set here (0 to 4) have no connection whatsoever to the address areas on the CPU, i.e. they are not used as address areas in the S7 program. They merely represent the source and destination areas for data exchanges with the CPU. However, the address value itself can also be used as an offset to the start value of the address for the source or destination area of the DP-SEND/DP-RECV blocks.


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Exercise 1 : Configure the CP342-5 DP as a DPM Online diagnosis (cyclical)

DP master mode


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Task description:

Your task is to use the CP342-5 as a DP master instead of the integrated CPU interface. You must use the ET200M (with analog module) and the ET 200S as DP slaves.

Procedure

1.Install the CP342-5 module in the rack of the master station 2.Disconnect the bus cable from the integrated CPU interface (DP master) and connect it to the interface of the CP 3.Use the bus cable to connect up the ET200M (address 4) and theET200S (address 8) as DP slaves (switch over terminating resistors) 4.Switch the ONLINE interface of STEP7 over to MPI 5.Configure the CP342-5 DP as the DP master 6.Use the Save and comp ile function to create new system data blocks and load them to the CPU. 7.Monitor the boot process and correct any errors that might occur 8.Open the properties dialog of the CP342-5 and click on command Execute on the Diagnosis tab 9.In the left-hand window, open the folder PROFIBUS and select Nodes

Result

Even though no DP slave has yet been configured, the stations networked on the bus cable are displayed with their bus address and the active/passive status. This view is updated dynamically if you activate monitoring mode (spectacles symbol).


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Exercise 2 : Configure the ET200M and ET200S


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Task

Your task is to configure the ET 200M and ET 200S as DP slaves on the CP342-5 DP master system.

Procedure

1.Configure the ET 200S with the following parameters as a DP slave on the master system: -

Bus address: 8

-

I address: 0.0 - 0.7 (compress addresses)

-

O address: 0.0 - 0.7 (compress addresses)

2.Configure the ET200M with the following parameters as a DP slave on the master system: -

Bus address: 4

-

Module AI 2x12bit : I address: 2 .. 5

3.Create new system data blocks (Save and compil e) 4.Download the configuration to the PLC 5.Open the properties dialog of the CP342-5 again. Click on commandExecute on the Diagnosis tab. 6.Open the folder DP master in the left-hand window. Result

The two slaves are still displayed as "faulted". The reason for this is that the master does not commence a cyclic data exchange with the two slaves until a data exchange using blocks DP_SEND and DP_RECV is already in progress between the CPU and DP master. This will be programmed in the next exercise.


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Exercise 3 : Program a data exchange 304(dec) = 130(hex)

304(dec) = 130(hex)


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S7 program

Programming the data interface between the S7 program (CPU) and the DP master (CP).

Procedure

1.Unzip project 09_DPM_CP342-5DP.zip 2.Open OB1 in block container "Conveyor belt", add the call for function FC1 "DP_SEND" and assign the block interface parameters 3.In a new final NW, insert the call for block FC2 "DP_RECV" and assign the block interface parameters 4.If necessary, copy the blocks FC105 and OB35 to your S7 program. Check the analog addresses, etc. 5.Download all blocks in the program Conveyor belt to the CPU. 6.Open the properties dialog of the CP342-5 and click on command Execute on the Diagnosis tab 7.Open the folder DP master in the left-hand window.

Result

The two slaves are now displayed as "o.k.". The master system itself is also displayed as functioning correctly: BF LEDs on the DP master and slaves have now gone out. The belt model function and analog value display on the simulator should now work exactly the same as if the CPU interface had been used as the DP master.


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09_CP342-5-DP-Master

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