02 Transmission Media PROFIBUS

Automation and Drives

Transmission media for PROFIBUS Interface for the first station

Interface for the last station Bus termination

+5V

Bus termination

VP (6)

(6) VP + 5 V

390



RxD/TxD-P (3)

220



390

Data line B

 (3) RxD/TxD-P

220

Data line A

 (8) RxD/TxD-N

RxD/TxD-N (8)

390

390



 (5) DGND

DGND (5)

A

B

A

B

Station 1 .............. Station 32 SITRAIN IK-PBSYS / Transmission Media

Page 1

Contents

07/2007 © Siemens AG 2007 2007 - All reightsreserved reightsreserved

Page

Electrica Electricall network, network, introdu introduction ction

........... ................ .......... ........... ........... .......... .......... .......... ........... ............ ............ ............ ........... .......... ........... ........... .......... .......... ........ ...

2

Cables Cables for the electrica electricall PROFIBUS PROFIBUS network network ........... ................. ........... ........... ........... ........... ........... .......... ........... ........... .......... .......... ........... ........... ........ ...

3

Structur Structure e of a segmen segmentt in in the electric electrical al network network ........... ................ ........... ............ ........... .......... ........... ............ ........... .......... .......... ........... ........... ......... ....

4

Use Use of “Fas “FastC tCon onne nect ct - Tech Techno nolo logy gy““

.... ...... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... ....

5

Principa Principall outlay outlay for the interfac interfaces es used with RS 485 ........... ................ .......... .......... .......... ........... ............ ............ ............ ............ ........... ........... ........

6

Terminat Terminating ing resistor resistor for the electric electrical al PROFIBUS PROFIBUS DP ............ ................. .......... ........... ........... .......... ........... ............ ........... ........... ........... .......... .....

7

Resistor Resistor for termina terminating ting PROFIBUS PROFIBUS

........... ................ ........... ............ ........... ........... ........... .......... ........... ........... .......... ........... ........... .......... ........... ........... ........ ..... ..

8

Topolo Topology gy of an electric electrical al PROFI PROFIBUS BUS system system with with repeat repeaters ers ........... ................ .......... ........... .......... .......... ........... .......... .......... ........... ......... ... Configu Configurati ration on options options with repeat repeaters ers .......... ................ ........... .......... .......... .......... ........... ........... .......... .......... .......... ........... ........... .......... ........... ........... .......... ........ ...

9 10

DP/DP coupler coupler

11

........... ................ .......... ........... ............ ........... .......... .......... .......... .......... .......... ........... ........... .......... .......... .......... ........... .......... .......... ............ ............ ........... .......... ....... ..

Diagnost Diagnostic ic repeate repeaterr

.......... ............... .......... .......... ........... ............ ............ ........... .......... ........... ............ ........... .......... .......... .......... ........... ............ ........... ........... ........... .......... ......... ....

12

BT200 BT200 test test unit unit for bus cable cables s to RS485 RS485 .......... ................ ............ ........... ........... ........... .......... .......... .......... .......... ........... ............ ........... .......... ........... ........... .....

13

Compone Components nts of an an optica opticall bus bus system system .......... ................ ............ ........... .......... .......... .......... ........... ........... ........... ............ ........... .......... .......... .......... .......... ......... .... Advantages Advantages of the optical bus bus system ........................................................................... ............................................................................................... ....................

14 15

Glass Glass FOC: FOC: Fiber-op Fiber-optic tic cable cable

........... ................ ........... ............ ........... .......... .......... .......... ........... ........... .......... .......... ........... ............ ........... .......... ........... ........... .......... .....

16

........... ................ ........... ............ ........... .......... .......... .......... .......... ........... ........... .......... .......... ........... ........... .......... ........... ........... .......... ......... ....

17

........... ................ .......... .......... .......... ........... ............ ............ ............ ........... .......... .......... .......... ........... ............ ............ ............ ........... ....... ..

18

Line topolog topology y

............ .................. .......... .......... ........... .......... .......... .......... ........... ............ ........... .......... .......... ........... ............ ........... .......... ........... ............ ........... .......... .......... ........... ........ ..

19

Star topolog topology y

.......... ................ ........... .......... .......... .......... ........... ........... .......... .......... .......... ........... ............ .......... .......... ........... .......... .......... .......... .......... ........... ............ ........... .......... .......

20

Bus cable cable and connect connection ions s for PROFIBUS PROFIBUS PA ........... ................. ............ ............ ............ ........... .......... .......... .......... ........... ........... ........... ........... ......... ....

21

Basic Basic PROFIBUSPROFIBUS-PA PA compon component ents: s: Coupler Coupler and and Link Link ........... ................ .......... .......... .......... .......... ........... ........... .......... ........... ........... .......... ........ ...

22

Glass Glass FOCs: FOCs: Various Various types types Optical Optical Link Link Modul Modul (OLM/ (OLM/ S4)

SITRAIN Trainin Training g for Automation and Industrial Solutions

Page 1

IK-PBSYS Transmission Media


Electrical network, introduction

Explosion proof area

Drive

PROFIBUS cable Connecting cable

SITRAIN IK-PBSYS / Transmission Media

Electrical network

Page 2

07/2007 © Siemens AG 2007 2007 - All reightsreserved reightsreserved

The electrical network uses a shielded twisted-pair cable. cable . The RS 485 interface uses voltage differences. It is therefore more insensitive to disturbances than a voltage or current interface. In PROFIBUS, the nodes are connected to the bus with a bus terminal or bus connector (up connector (up to 32 nodes per segment). The individual segments are connected through repeaters. repeaters . The transmission rate can be adjusted in steps from 9.6 kbit/s to 1.5 Mbit/s. Mbit/s. For extremely time-critical PROFIBUS DP applications, the transmission rates 3 and 6 as well as 12 Mbit/s to IEC 61158/ EN 50170 can also be used. The maximum segment length depends of the transmission rate. rate . The electrical network can be configured as a line ( bus) or tree topology (see diagram above). For failsafe applications using PROFIBUS PA transmission technology to IEC 61158-2 is used. In this case, the transmission rate is 31.25 kbit/s. kbit/s.

Features

• HighHigh-qu quali ality ty bus cable cable • Transmi Transmission ssion metho method d to RS 485 (in (in acc. with with EIA) • Bus topology topology with bus terminals terminals and bus bus connector connector for connecting connecting PROFIBUS nodes • Transmi Transmissio ssion n procedu procedure re to IEC IEC 61158/ 61158/EN EN 50170 50170 for for univers universal al automation automation (PROFIBUS FMS/DP) FMS/DP) as well as IEC 61158-2 61158-2 for intrinsically safe applications (PROFIBUS PA) • The network components components (DP/PA (DP/PA coupler coupler or DP/PA link) convert convert the the DP transmission technique from RS 485 (bit coding by means of voltage difference signals) to IEC 61158-2 (bit coding by means of current signals) • Simple, system-wide installation and groundin grounding g concept concept • Easy Easy inst install allati ation on..

SITRAIN Trainin Training g for Automation and Industrial Solutions

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Cables for the electrical PROFIBUS network Data cable A: Green core Data cable B: Red core

Structure

Shielded twisted-pair cable

Loop resistance

135 ... 165 ohms

Wave impedance

110 ohm / km

Core diameter

0.64 mm

Core cross-section

> 0.34 mm²

Capacitance per unit length

< 30 pF / m


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07/2007 © Siemens AG 2007 - All reightsreserved

FC standard cable 6XV1 830-0EH10 The 6XV1 830 0EH10 bus cable is the standard FastConnect bus cable for PROFIBUS networks. It complies with the requirements of EN 50170, cable type A, with solid copper cores (AWG 22). The combination of twisted cores, foil shield and braided shield makes it especially suitable for installation in industrial environments subjected to electromagnetic interference. The design also guarantees additional stability of the electrical and mechanical data in the installed state. The cable design permits the use of the FastConnect (FC) stripping tool for fast connection of the cable. With the help of the FastConnect stripping tool it is possible to strip the outer shield and cable shield of the new FastConnect bus cables to the correct length in a single step. In this way, the new bus connectors ( except 6ES7 972-0BA30-0XA0) can be connected easily and quickly to the bus cable. Features

The shield material contains special substances which makes the bus cable: • • • •

Application

Non-flammable Self-extinguishing in the event of a fire Resistant to mineral oils and grease Made of non-halogen-free shield material.

The bus cable has been designed for permanent installation in buildings (in-house wiring).

SITRAIN Training for Automation and Industrial Solutions

Page 3



Structure of a segment in the electrical network Segment range 9.6-19.2-93.75 187.5 500 1500 12000

kbit/s kbit/s kbit/s kbit/s kbit/s

1200m 1000m 400m 200m 100m

without repeater : max. 1000 m on 9.6 kbit/s max. 32 nodes with repeaeter : max. 1000 m on 9.6 kbit/s max. 31 nodes per segment max. 9 repeater in line, max. 127 nodes

twisted, shielded pair

Busconnector SITRAIN IK-PBSYS / Transmission Media

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Twisted-pair cable

The electrical PROFIBUS network uses a shielded twisted-pair cable. The RS 485 interface uses voltage difference signals.

Noise immunity

This interface is especially insensitive to disturbances.

Connection method In PROFIBUS, the nodes are connected to the bus with a bus connector or bus terminal. 32 nodes

Up to 32 interfaces can be connected per bus segment.

Segment length

The maximum segment length depends on the transmission rate.

Transmission rate

The transmission rate can be adjusted in steps from 9.6 kbit/s to 1.5 Mbit/s. For extremely time-critical DP applications and short distances, the additional transmission rates of 3.6 and 12 Mbit/s can be used.

Repeaters

Individual segments are connected via repeaters. The 12 Mbit repeater permits cascading of 10 segments.


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Use of “FastConnect - Technology“ 1. Measure

2. Strip

3. Remove

4. Insert cores into the colored sockets of the connector

6. Tighten cable strain relief

5. Push sockets down

A: Green core B: Red core


Page 5


Preventing errors through FastConnect Correct physical installation of the bus system is a prerequisite for smooth operation of the system. Since badly assembled connectors often result in downtimes, it is important to take great care during installation. The FastConnect connection method for PROFIBUS supports and speeds up this work significantly. Easy-to-use tools, bus cables and connectors permit correct assembly within minutes: • FastConnect stripping tool (6GK1 905-6AA..) • FastConnect standard bus cable (6XV1 830-0E...) • FastConnect bus connector with insulation displacement (6ES7 972-0B .50) Procedure

1.Measure the cable length by comparing the cable with the measuring template. 2.Insert the measured cable end into the stripping tool. Use the index finger of the left hand to determine how deep to insert the cable. Insert the cable in the stripping tool as far as the stop. Turn the stripping tool four times in the clockwise direction to strip the cable. 3.Pull the stripping tool from the end of the cable while closed. Bits of the cable will remain in the tool. When the tool is opened, the bits can be removed. If the white filling was not removed during stripping, remove it with your hand. Pierce the protective foil between the cores with a screwdriver to remove it more easily. Remove the protective foil of the cores.


Page 5



Principal outlay for the interfaces used with RS 485 Interface for the first station

Interface for the last station Bus termination

+5V

Bus termination

VP (6)

(6) VP + 5 V

390



RxD/TxD-P (3)

220



390

Data line B

 (3) RxD/TxD-P

220

Data line A

 (8) RxD/TxD-N

RxD/TxD-N (8)

390

390



 (5) DGND

DGND (5)

A

B

A

B

Station 1 .............. Station 32


Bus termination

Page 6


This slide shows the wiring and bus termination for a PROFIBUS system with cable type A. This is the preferred installation and termination method for all PROFIBUS networks. The termination for the network is usually located at the beginning and end of the segment. It must be ensured that the terminating resistors are always supplied with power. It is recommended to connect one bus termination to the master and the other one to the last slave of the segment.

Note:

When using repeaters it is meaningful to install one bus termination at the output and the other one at the last station of the bus segment or at the input of the next repeater.

Note:

The stations to which the terminating resistor is connected must always be supplied with power since the bus connector draws power from the station to which it is connected.


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Terminating resistor for the electrical PROFIBUS DP CPU with PROFIBUS DP interface Terminating resistor required

N

N

N

N

N= PROFIBUS DP nodes

CPU with PROFIBUS DP interface Terminating resistor required

Terminating resistor required

N

N


N

N

Page 7

N

N= PROFIBUS DP nodes


Terminating resistor Switch on the terminating resistor of the first and last station of a segment. For bus connectors of the older type, this is done by opening the cover of the bus connector and setting the switch to ON (see diagram). For newer bus connectors, set the red toggle which is located outside the connector to the ON position. Termination principle PROFIBUS is only terminated correctly if the power supply of the node into which the terminating resistor has been inserted has been switched on. If this is not convenient, PROFIBUS can also be connected over an active RS485 terminating resistor (6ES7972-0DA00-0AA0). In this case, the terminating resistor is supplied permanently with a separate voltage from the other I/O components or a voltage that is connected up-circuit from the I/O. Termination of the bus system allows the nodes (e.g. ET 200L) to be connected or disconnected freely without causing errors.


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Resistor for terminating PROFIBUS

PROFIBUS connection


Page 8


Cable termination with/without PROFIBUS terminator All segments must be terminated at their ends regardless of the transmission rate. For this purpose, the existing cable termination consisting of a resistor combination must be switched on in the corresponding connection elements. Additional cable segments are not permitted following an activated resistor combination. A cable termination is only active if it is connected to a supply voltage. For this purpose, the corresponding data terminal or RS485 repeater must be supplied with power. Alternatively, the PROFIBUS terminator can be used as a permanent cable termination. PROFIBUS terminator The PROFIBUS terminator is an active bus termination. The main advantage is that nodes on the bus can be switched off, removed or replaced without negatively affecting the data communication. This applies especially to the nodes at the two ends of the bus cable where up to now the terminating resistors had to be connected and supplied. The PROFIBUS terminator can be mounted onto a standard mounting rail.


Page 8



Topology of an electrical PROFIBUS system with repeaters OP270

PG attached via tap line for maintenance purposes OP270

OP270

Terminating resistor activated


RS 485 repeater

Page 9


You will require an RS 485 repeater if: • More than 32 stations (including the repeater) are connected to the bus • Bus segments on the bus are to be operated ungrounded or • The maximum cable length of a segment is exceeded The diagram above shows how several segments have been combined into a network by means of repeaters. The RS 485 repeaters support all transmission rates from 9.6 kbits/s to 12 Mbits/s.

Configuration

The following boundary conditions must be considered when configuring an electrical network with RS 485 repeaters: • The maximum segment length for the transmission rate must be observed • The maximum number of bus couplings (nodes, RS 485 repeaters, OLM) on a segment is limited to 32. Additional restrictions may apply if the transmission rate of 1.5 Mbit/s is used. • The maximum number of nodes on a network is limited to 127. • No more than 9 RS 485 repeaters may be installed between two nodes • Each repeater reduces the number of possible nodes in the network by one.


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Configuration options with repeaters terminating resistor at segment 1 is ON

Terminating resistor activated! Example 1

terminating resistor at segment 2 is ON

terminating resistor at segment 1 is ON

Terminating resistor activated!

Example 2

terminating resistor at segment 2 is OFF


Examples

Page 10


The two configurations in the diagrams above show two examples of possible topologies with repeaters. Please note that the terminating resistance at the beginning and end of a bus segment is switched on i.e. the switch position must be set to ON. Transmission rate

Max. segment length

Max. network size with 9 repeaters

9.6 kbit/s

1,200 m

12,000 m

19.2 kbit/s

1,200 m

12,000 m

45.45 kbit/s

1,200 m

12,000 m

93.75 kbit/s

1,200 m

12,000 m

187.5 kbit/s

1,000 m

10,000 m

500 kbit/s

400 m

4,000 m

1,500 kbit/s

200 m

2,000 m

3,000 kbit/s

100 m

1,000 m

6,000 kbit/s

100 m

1,000 m

12,000 kbit/s

100 m

1,000 m


Page 10



DP/DP coupler

PROFIBUS DP (Net 1) 1,5 MBit/s possible bus addresses: 1-122

ET200 PB(1)=3 Slave

Drive PB(1)=4 Slave

PROFIBUS DP (Net 2) 12 MBit/s possible bus addresses: 1-122

ET200 PB(1)=5 Slave


ET200 PB(„)=3 Slave

Drive PB(2)=4 Slave

ET200 PB(2)=5 Slave

Page 11


Task of the DP/DP coupler The DP/DP coupler can be used to transfer data between two PROFIBUS DP networks by means of internal copying. Field of application The PROFIBUS DP/DP coupler is used to connect two PROFIBUS DP networks with each other. This is done by transmitting byte data (0–244 bytes) from the DP master of the first network to the DP master of another network and vice versa. The principle is the same as conventional hard-wiring of inputs and outputs. The coupler uses two independent DP interfaces with which it connects the two DP networks. The DP/DP coupler is a slave on each DP network. Data transmission between the two DP networks is implemented by internal copying in the coupler. Design:

The DP/DP coupler has a compact 40 mm housing and can be mounted on a standard rail. It is recommended that the couplers are installed vertically next to each other. The coupler is connected to the PROFIBUS DP networks via an integrated 9-pin Sub-D connector.

Functions:

The DP/DP coupler continuously copies the output data of one network to the input data of the other network (and vice versa).

Parameterization

The PROFIBUS DP addresses are set via two DIP switches on the top of the unit. The system is configured by means of the GSD file with the configuring tool of the connected PROFIBUS DP master.


Page 11



Diagnostic repeater S7-CPU

STEP7 COM PROFIBUS Segment 1 Start determining of topology

Diagnostic distance to slave

distance to disturbance

Segment 2


Introduction

Segment 3

Page 12


During operation, the bus cables are subjected to external influences which can result in damage. This is particularly apparent if they are stressed, e.g. due to trailing cables or strong vibrations. In this case, they should be checked continuously to reduce failures to a minimum.

Diagnostic repeater The diagnostic repeater is used for diagnostics during operation. It is integrated into the PROFIBUS DP network as an RS 485 repeater and also offers powerful functions for cable diagnostics. The diagnostic repeater recognizes the following cable faults: • Open circuit A or B • Line-to-shield short-circuit (signal cables) • Missing bus terminating resistors The diagnostic repeater is configured in STEP 7 as a standard slave with COM PROFIBUS or using a GSD file. Design

• • • • • • •

Connection of 3 segments, two of which have diagnostics capability Connection of up to 62 nodes (31 per segment with diagnostics capability) Installation of up to 9 diagnostic repeaters in series Mounting on an S7-300 DIN rail or standard mounting rail LEDs to indicate 24 V DC, bus activity and line faults per segment Terminal block for external 24 V DC supply voltage 9-pin Sub-D socket for connection to PG, electrically isolated


Page 12



BT200 test unit for bus cables to RS485 Testing the PROFIBUS cable: Cable break/shield break Short circuits between cables or cable and shield Fault localization in the event of data cable break/short-circuit Detection of reflections which cause faults Cable replacement Lengths of the installed cables Checking the accessibility of the slaves: List of accessible slaves Specific addressing of individual slaves Checking the RS 485 interfaces of the masters and slaves: RS 485 driver Supply voltage for cable termination RTS signal Display of the PROFIBUS DP address


Application

Page 13


The PROFIBUS cable can be tested with the BT 200 test unit during the installation phase. The wiring can even be checked when the nodes have been connected. Installation errors are detected quickly and easily. The person installing the system does not require specialist PROFIBUS knowledge. The RS 485 interface of the PROFIBUS DP slaves and masters can be tested with the BT 200 even before the system start-up phase. The slaves which can be addressed over the completely wired bus can also be listed without a master on PROFIBUS DP. In this way, the operating capability of individual bus segments can be checked beforehand. This reduces the start-up time. In the event of a fault, the two test functions mentioned above are very helpful for localizing the fault and therefore minimize plant downtimes.

Functions

Cable break/shield break • Short-circuits between cables or between the cable and the shield • Fault localization in the event of a break or short-circuit in the data cables • Detection of reflections which cause faults • Cable replacement • Lengths of the installed cables Checking the availability of the slaves: • List of available slaves • Specific addressing of individual slaves Checking the RS 485 interface of the master/slave : • RS 485 driver • Supply voltage for cable termination • RTS signal.


Page 13



Components of an optical bus system ET 200M with IM 153-2FO Field device without fiber-optic interface

OBT: Optical Bus Terminal 1: Fiber-optic cable 1 Fiber-optic cable 2 PROFIBUS cable 3 PROFIBUS connecting cable 830-1T 4 PROFIBUS connecting cable 830-2 (1) Terminating resistor switched on SITRAIN IK-PBSYS / Transmission Media

OLM: Optical Link Module

Up to 15 km

Page 14


Characteristics of an optical network • An optical line is permitted to have a maximum of 32 integral optical interfaces in series. • Several lines comprising up to 32 integral optical interfaces can be connected via OBTs (optical repeaters). • For optical networks (line, star, ring) which only consist of OLMs, the number of OLMs is limited to 122. • The number of optical components (integral interfaces, OBTs, OLMs) in the optical PROFIBUS network must be specified in the configuration tool under "Number of OLMs, OBTs”.


Page 14



Advantages of the optical bus system •

Electrical isolation of nodes and segments

•

No compensating currents

•

Transmission path is not affected by external electromagnetic interference

•

No lightning protection elements required

•

No noise radiation along the transmission path

•

Low weight

•

Depending on the fiber type, cable lengths of up to a few kilometers can be implemented even for high transmission rates

•

The max. cable length does not depend on the transmission rate

•

The PROFIBUS optical components can be used to implement line, star and ring structures. SITRAIN IK-PBSYS / Transmission Media

Page 15


Fiber-optic cables (FOC) In the case of fiber-optic cables (FOC), data is transmitted through modulation of electromagnetic waves in the visible and invisible light spectrum. High-quality plastic and glass fibers are used for this purpose. The different FOC types can be used to match the solution for interconnecting components to the prevailing operating and environmental conditions. The fiber-optic cables for PROFIBUS are available with plastic, PCF and glass fibers: • Glass fiber-optic cable, 2-fiber cable for optical PROFIBUS networks indoors and outdoors • Plastic fiber-optic cable, duplex or standard cable for indoor applications with cable lengths up to 80 m • Plastic fiber-optic cable, standard cable for indoor applications with cable lengths up to 400 m Type of connection Due to technical reasons, FOCs can only be used to implement point-to-point connections i.e. each sender is only connected to one receiver. Duplex transmission between two nodes therefore requires two fibers (one for each direction of transmission).


Page 15



Glass FOC: Fiber-optic cable

RS 485-Segment

Monomode Glass FOC >15km

Glass FOC: Fiber-optic cable

Multimode Glass FOC 2-3km

PCS/HCS FOC 500m

Plastic FOC <80m

RS 485-Segment


Glass FOC

Page 16


Glass FOCs are used to bridge distances in the km range. For these distances, it is often not possible to install an uninterrupted length of cable. In this case, the FOC path must comprise several segments. The connection points consisting of couplings or splicing components cannot be implemented without attenuation. Furthermore, if the transmission path uses glass FOCs, the following must be taken into consideration: • Attenuation of the splicing points • Attenuation of the coupling points • When calculating the transmission path, a system reserve of at least 3 dB (for a wave length of 860 nm) or of at least 2 dB (for a wave length of 1300 nm) must be maintained. There are different versions of SIMATIC NET glass fiber-optic cables (FOC) which allow optimal adaptation to different application areas.

Application

• The fiber-optic standard cable is a universal cable for use indoors and outdoors • The INDOOR Fiber-Optic cable is a halogen-free, trample-resistant, flameretardant FOC cable for use in buildings • The Flexible Fiber-Optic trailing cable is used for special motion control applications • The SIENOPYR marine duplex fiber-optic cable is a hybrid cable made of 2 fiber-optic cables and 2 additional copper cables for permanent installation on ships and offshore installations.

SIMATIC NET standard fibers For glass FOC, SIMATIC NET uses a fiber with a 62.5 micro millimeter core diameter as standard. Splicing points

Repair splicing points must also be taken into account. Depending on the cables and stresses they are exposed to, one or more repairs should be taken into consideration ( approx. 1 per 500 m). Two splicing points are necessary for each repair since a long cable segment often has to be inserted (depending on the accuracy of the fault localization device).


Page 16



Glass FOCs: Various types 1 Outer jacket black PVC 2 Inner jacket gray PVC 3 Support element (Impregnated glass yarn) 4 Kevlar yarn 5 Fiber

1 Outer jacket 2 Aramid yarn 3 Fleece/strands 4 Dummy Dummyelement element 5 Support element 6 Inner jacket

Standard FO cable

7 Aramid yarn 8 Fiber

Flexible F= Trailing cable

Outer sheath Copolymer FRNC, bright orange Inner sheath Copolymer FRNC, gray Aramid strain relief elements

Standard INDOOR FO cable

FRNC core sleeve

Glass fiber G62.5/125 μm


Page 17


Standard fiber-optic cable 6XV1820-5 The Standard fiber-optic cable comprises two multimode graded-index fibers of type 62.5/125 m. The outer casing is printed with “SIEMENS SIMATIC NET FIBER OPTIC 6XV1 820-5AH10” at intervals of about 50 cm. Meter markings consisting of a vertical line and a 4-digit number make it easier to estimate the length of the installed cable. The cable is sold by the meter (up to 4000 m). It is preassembled with 4 BFOC connectors in lengths of up to 1000 m. It is used to connect optical interfaces which use wavelengths around 850 nm and around 1300 nm. INDOOR fiber-optic cable 6XV1820-7 The INDOOR fiber-optic cable comprises two multimode graded-index fibers of 62.5/125 micromilli meters. The outer shield is printed with “SIEMENS SIMATIC NET INDOOR FIBER OPTIC 6XV1 820- 7AH10 FRNC” at intervals of about 50 cm. Meter markings consisting of a vertical line and a 4-digit number make it easier to estimate the length of the installed cable. It is available preassembled with 4 BFOC connectors in lengths from to 0.5 m to 100 m. It is used to connect optical interfaces which use wavelengths around 850 nm and around 1300 nm. Flexible fiber-optic trailing cable 6XV1820-6 The Flexible fiber-optic trailing cable comprises two multimode graded-index fibers of 62.5/125 μm. Integrated dummy elements ensure that the cross-section of the cable is round. The outer shield is printed with “SIEMENS SIMATIC NET FLEXIBLE FIBER OPTIC 6XV1 820- 6AH10” at intervals of about 50 cm. Meter markings consisting of a vertical line and a 4-digit number make it easier to estimate the length of the installed cable. The cable is highly flexible (100,000 bending cycles with a 150 mm/min bending radius) and is sold by the meter (up to 2000 m). It is available preassembled with 4 BFOC connectors in fixed lengths of up to 650 m.


Page 17



Optical Link Modul (OLM/ S4)


Description

Page 18


The SINEC L2 optical link modules OLM/P3, OLM/P4, OLM/S3, OLM/S4, OLM/S3-1300 and OLM/S4-1300 are intended for use in optical PROFIBUS fieldbus networks. They can be used to convert electrical PROFIBUS interfaces (RS 485 level) into optical PROFIBUS interfaces and vice versa. You can integrate the modules into the existing PROFIBUS fieldbus network by utilizing the advantages of optical transmission. It is also possible to construct complete PROFIBUS fieldbus networks using optical link modules with a line, star or ring topology. To increase the failure safety of the fieldbus network, the modules OLM/P4, OLM/S4 and OLM/S4-1300 permit redundant network configuration. Each module has three or four channels (ports) which are independent of each other. They in turn consist of one sender and receiver component. Tables 1 and 2 show the different connection options for the modules and the maximum ranges for the individual channels.

Operating voltage

The operating voltage is 24 V DC. To increase availability, a redundant operating voltage supply is possible.

Channels

Channel 1 is implemented as a 9-pin Sub-D socket (female), Channel 2 uses a 2pin terminal block with a shield clamp. The fiber-optic cables are connected using BFOC / 2.5 sockets.

Displays

Five multicolored LEDs signal the current operating status and possible faults.


Page 18



Line topology OP270 OP270

Terminating Resistor switched on bus connector 1 Fiber-Optic Cable 2 PROFIBUS Bus Cable 3 PROFIBUS connecting cable 830–1T 4 PROFIBUS connecting cable 830-2


Line topology

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The individual optical link modules are connected to each other in pairs by means of duplex FOCs. At the beginning and end of a line it is sufficient to use optical link modules that have one optical channel, in between it is necessary to use optical link modules with two optical channels. Individual data terminals or complete PROFIBUS segments with up to 31 nodes can be connected to each optical link module via electrical channels with RS 485 interfaces. The advantage of this topology is that it can be used to bridge large distances. Echo functions (operating mode 0) can be used to monitor the individual FOC paths by means of the two connected optical link modules. If an optical link module fails or if a fiber-optic cable breaks, the overall network breaks up into two subnets. Fault-free operation is still possible within these subnets. If individual point-to-point connections must be established, this can be done with two optical link modules with one optical channel each.


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Star topology

starpoint

OP270

Terminating Resistor switched on 1 Fiber Optic 2 PROFIBUS Cable 4 PROFIBUS connecting cable 830-2


Star topology

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Several optical link modules are combined into a single PROFIBUS star hub. Additional optical link modules are connected to this hub via duplex fiber-optic cables. The optical link modules of the star hub are connected to each other over one of the electrical channels. The other electrical channels in this network topology are available for connection of data terminals or RS 485 segments. To construct an active PROFIBUS star hub, optical link modules with one or two optical channels can be used. An optical link module with a single channel is sufficient to connect a data terminal or RS 485 bus segment to the active star hub. The echo function (operating mode 0) of the two connected optical link modules can be used to monitor the FOC path. Even if only one direction of transmission fails, the segmentation function coupled with the monitoring system will safely disconnect the whole connection from the network. In a star topology, only the data terminal on the faulty path is disconnected from the network. Fault-free operation is still possible for the rest of the network. To increase the availability of the whole network, a redundant operating voltage supply for the active PROFIBUS star hub is recommended.


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Bus cable and connections for PROFIBUS PA


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Overview

• Bus cable for fieldbus systems according to IEC 61158-2, e.g. PROFIBUS PA • High interference immunity thanks to double shielding • Different variants for different applications (hazardous areas, non-hazardous areas) • Easy length measurement thanks to printed meter markings

Application

Differently marked cables are available for constructing fieldbus networks to IEC 61 158-2 (e.g. PROFIBUS PA) for different applications (hazardous areas, nonhazardous areas).

Design

• Shielded, twisted-pair cable with circular cross-section • System-wide grounding concept can be implemented using the external shield of the bus cable and the grounding terminals of the SpliTConnect system • Printed meter markings.

Cable types

• FC process cable: Special bus cable to IEC 61158-2 for use in hazardous areas and nonhazardous areas. • Bus segments with the RS 485 and IEC 61158-2 transmission method are interconnected using the segment coupler/link.


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Basic PROFIBUS-PA components: Coupler and Link PROFIBUS DP up to 12 Mbit/s

PROFIBUS DP 45.45 kbit/s

DP/PA link (modular expansion capability, head module with up to 5 couplers)

DP/PA coupler

J J

J

J

PROFIBUS PA 31.25 kbit/s

PROFIBUS PA 31.25 kbit/s

Non-Ex variant: I < 400 mA, up to 31 field devices


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Core statement:

For the transition from PROFIBUS-DP (RS 485) to PROFIBUS-PA (IEC 1158-2), the two network components DP/PA coupler and DP/PA link are available. Their use depends on the demands put on the automation technology.

DP/PA coupler

The DP/PA coupler has the following tasks: • Conversion of the data format from non-isochrone (11 bits/character) to isochrone (8 bits/character) and conversion of the transmission rate from 45.45 kbit/s to 31.25 kbit/s and vice versa. The coupler functions like a "wire"; it is not configured and cannot be detected by the bus nodes. • Power supply for the field devices • Limitation of the supply current by means of barriers (for hazardous applications) There are 2 variants of the DP/PA coupler: A non-Ex variant with an output current of up to 400 mA for supplying up to 31 field devices and a certified Exvariant with an output current of up to 90 mA for supplying up to 8 field devices in Zones 0, 1 and 2.

DP/PA link

The DP/PA link comprises up to 5 DP/PA couplers (Ex-variant) or 2 DP/PA couplers (non-Ex-variant) which are connected as a node through a head module to PROFIBUS-DP. The head module is a slave on the higher-level PROFIBUS DP (up to 12 MBit/s) and a master on the lower-level PA lines. These PA lines together form a logical bus. The sum of all field devices on a DP/PA link is limited to 30. This limitation applies regardless of the DP/PA coupler variant used. Prerequisite: The DP master can consistently transmit up to 244 bytes per slave (e.g. CP 443-5 Extended or IM 467). That is, the sum of all cyclic data is limited to 244 bytes per DP/PA link. Example: 20 transmitters (pressure, temperature) with 5 bytes each plus 5 transmitters (flow) with 15 bytes each plus 5 position controllers with 10 bytes each require together 225 bytes. The DP/PA link is used when there are high demands on the cycle time and for large numbers of signals.


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02 Transmission Media PROFIBUS

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