Siemens Simatic S7-300 CPU 31xC, Simatic S7-300 CPU 312C, Simatic S7-300 CPU 314C-2 DP, Simatic S7-300 CPU 313C-2 DP, Simatic S7-300 CPU 314C-2 PtP Installation And Operating Instructions Manual

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SIMATIC

S7-300, CPU 31xC and CPU 31x: Installation

Operating Instructions

Preface

Guide to the S7-300 documentation

Installation Order

S7-300 components

Configuring

Installing

Wiring

Addressing

Commissioning

Maintenance

Debugging functions, diagnostics and troubleshooting

Appendix

This manual is part of the documentation package with the order number: 6ES7398-8FA10-8BA0

Edition 08/2004

A5E00105492-05

Safety Guidelines

This manual contains notices which you should observe to ensure your own personal safety as well as to avoid property damage. The notices referring to your personal safety are highlighted in the manual by a safety alert symbol, notices referring to property damage only have no safety alert symbol.

Danger

indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

Warning

indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

Caution

used with the safety alert symbol indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

Caution

used without safety alert symbol indicates a potentially hazardous situation which, if not avoided, may result in property damage.

Notice

used without the safety alert symbol indicates a potential situation which, if not avoided, may result in an undesirable result or state.

If more than one degree of danger is present, the warning notice representing the highest degree of danger will be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to property damage.

Qualified Personnel

The device/system may only be set up and operated in conjunction with this documentation. Only qualified personnel should be allowed to install and work on the equipment. Qualified persons are defined as persons who are authorized to commission, to earth, and to tag circuits, equipment and systems in accordance with established safety practices and standards.

Intended Use

Please note the following:

Warning

This device and its components may only be used for the applications described in the catalog or technical description, and only in connection with devices or components from other manufacturers approved or recommended by Siemens.

This product can only function correctly and safely if it is transported, stored, set up and installed correctly, and operated and maintained as recommended.

Trademarks

All designations marked with ® are registered trademarks of Siemens AG. Other designations in this documentation might be trademarks which, if used by third parties for their purposes, might infringe upon the rights of the proprietors.

Copyright Siemens AG ,2004.All rights reserved Reproduction, transmission or use of this document or its contents is not permitted without express written authority. Offenders will be liable for damages. All rights, including rights created by patent grant or registration of a utility model or design, are reserved.

Siemens AG Automation and Drives Group P.O. Box 4848, D-90327 Nuremberg (Germany)

Siemens Aktiengesellschaft Order No. A5E00105492-05

Disclaimer of Liability We have checked the contents of this manual for agreement with the hardware and software described. Since deviations cannot be precluded entirely, we cannot guarantee full agreement. However, the data in the manual are reviewed regularly, and any necessary corrections will be included in subsequent editions. Suggestions for improvement are welcomed.

Siemens AG 2004 Technical data subject to change

Preface

Purpose of the manual

This manual contains all the information you need to configure, install, wire, address and commission an S7-300.

In addition, you will become familiar with the tools you can use to diagnose and eliminate errors in hardware and software.

Basic knowledge

To understand this manual, you require a general knowledge of automation engineering. You should also be accustomed to working with STEP 7 basic software. For further information, refer to the Programming with STEP 7 V5.3 manual.

Area of application

Note The special features of the 315F-2 DP and CPU 317F-2 DP CPUs are described in their

Product Information, available on the Internet at http://www.siemens.com/automation/service&support, article ID 17015818.

Order number

CPU designation

CPU 312C 6ES7312-5BD01-0AB0 V2.0.0 01 CPU 313C 6ES7313-5BE01-0AB0 V2.0.0 01 CPU 313C-2 PtP 6ES7313-6BE01-0AB0 V2.0.0 01 CPU 313C-2 DP 6ES7313-6CE01-0AB0 V2.0.0 01 CPU 314C-2 PtP 6ES7314-6BF01-0AB0 V2.0.0 01 CPU 314C-2 DP CPU 312 6ES7312-1AD10-0AB0 V2.0.0 01 CPU 314 6ES7314-1AF10-0AB0 V2.0.0 01 CPU 315-2 DP 6ES7315-2AG10-0AB0 V2.0.0 01 CPU 315-2-PN/DP 6ES7315-2EG10-0AB0 V2.3.0 01 CPU 317-2 DP 6ES7317-2AJ10-0AB0 V2.1.0 01 CPU 317-2 PN/DP

CPU 31xC

6ES7314-6CF01-0AB0 V2.0.0 01

CPU 31x

6ES7317-2EJ10-0AB0 V2.3.0 01

as of version CPU Convention: Firmware Hardware

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

iii

Preface

Approvals

CE label

Note There you can obtain the descriptions of all current modules. For new modules, or modules of a more recent version, we reserve the right to include a

Product Information containing latest information.

The SIMATIC S7-300 product series has the following approvals:

• Underwriters Laboratories, Inc.: UL 508 (Industrial Control Equipment)

• Canadian Standards Association: CSA C22.2 No. 142, (Process Control Equipment)

• Factory Mutual Research: Approval Standard Class Number 3611

The SIMATIC S7-300 product series satisfies the requirements and safety specifications of the following EU Directives:

• EU Directive 73/23/EC "Low-voltage directive"

• EU Directive 89/336/EWE "EMC directive"

C tick mark

Standards

The SIMATIC S7-300 product series is compliant with AS/NZS 2064 (Australia).

The SIMATIC S7-300 product series is compliant with IEC 61131-2.

S7-300, CPU 31xC and CPU 31x: Installation

iv Operating Instructions, Edition 08/2004, A5E00105492-05

Preface

Documentation classification

This manual is part of the S7-300 documentation package.

Name of the manual Description Manual

• 31xC and 31x CPUs, technical data

Reference Manual

• CPU data: CPU 312 IFM – 318-2 DP

YOU ARE READING the Manual

• S7-300, CPU 31xC and CPU 31x: Installation

Installation Manual

• S7-300 Automation System: Installation: CPU 312 IFM – 318-2 DP

System Manual PROFINET System Overview

Programming Manual From PROFIBUS DP to PROFINET I/O Manual

• CPU 31xC: Technological functions

• Examples

Reference Manual

• S7-300 Automation System: Module data

Instruction List

• CPU 312 IFM – 318-2 DP

• CPU 31xC and CPU 31x

Getting Started The following Getting Started editions are available

as a collective volume:

• CPU 31x: Commissioning

• CPU 31xC: Commissioning

• CPU 31xC: Positioning with analog output

• CPU 31xC: Positioning with digital output

• CPU 31xC: Counting

• CPU 31xC: Rules

• CPU 31xC: PtP communication

• CPU 31x-2 PN/DP: Commissioning a

PROFINET I/O subnet

Control and display elements, communication, memory concept, cycle and response times, technical data

Configuration, installation, wiring, addressing, commissioning, maintenance and the test functions, diagnostics and troubleshooting.

Basic information on PROFINET: Network components, data exchange and

communication, PROFINET I/O, Component based Automation, application example of PROFINET I/O and Component based Automation

Guideline for the migration from PROFIBUS DP to PROFINET I/O.

Description of the various technological functions of positioning and counting. PtP communication, rules

The CD contains examples of the technological functions

Descriptions of the functions and technical data of signal modules, power supply modules and interface modules.

List of CPU instruction resources and the relevant execution times. List of executable blocks.

The example used in this Getting Started guides you through the various steps in commissioning required to obtain a fully functional application.

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

Preface

Additional information required:

Name of the manual Description Reference Manual

System software for S7-300/400 system and standard functions

Manual SIMATIC NET: Twisted Pair and Fiber-Optic Networks

Manual Component-based Automation: Configuring systems with

SIMATIC iMap Manual Programming with STEP 7 V5.3 Manual SIMATIC communication

Description of the SFCs, SFBs and OBs. This manual is part of the STEP 7

documentation package. For further information, refer to the STEP 7 Online Help.

Description of Industrial Ethernet networks, network configuration, components, installation guidelines for networked automation systems in buildings, etc.

Description of the engineering software iMAP

Programming with STEP 7

Basics, services, networks, communication functions, connecting PGs/OPs, engineering and configuring in STEP 7.

S7-300 documentation package: Additional documentation

Recycling and Disposal

The devices described in this manual can be recycled, because their components contain a minimum of harmful substances. For environment-friendly recycling and disposal of your old equipment, contact a certified disposal facility for electronic scrap.

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Preface ......................................................................................................................................................iii

1 Guide to the S7-300 documentation ....................................................................................................... 1-1

2 Installation Order .................................................................................................................................... 2-1

3 S7-300 components................................................................................................................................ 3-1

3.1 Example of an S7-300 configuration..........................................................................................3-1

3.2 Overview of the vital modules of an S7-300 .............................................................................. 3-2

4 Configuring ............................................................................................................................................. 4-1

4.1 Overview .................................................................................................................................... 4-1

4.2 Basic engineering principles ...................................................................................................... 4-1

4.3 Component dimensions ............................................................................................................. 4-4

4.4 Required clearances .................................................................................................................. 4-6

4.5 Arrangement of modules on a single rack ................................................................................. 4-7

4.6 Distribution of modules to several racks ....................................................................................4-8

4.7 Selection and installation of cabinets....................................................................................... 4-11

4.8 Example: Selecting a cabinet................................................................................................... 4-14

4.9 Electrical assembly, protective measures and grounding ....................................................... 4-15

4.9.1 Grounding concept and overall structure................................................................................. 4-15

4.9.2 Installing an S7-300 with grounded reference potential .......................................................... 4-16

4.9.3 Configuring an S7-300 with ungrounded reference potential (not CPU 31xC)........................ 4-17

4.9.4 Modules with isolated or common potential?........................................................................... 4-19

4.9.5 Grounding measures ............................................................................................................... 4-21

4.9.6 Overview: Grounding ............................................................................................................... 4-24

4.10 Selecting the Load Power Supply............................................................................................ 4-26

4.11 Planning subnets ..................................................................................................................... 4-28

4.11.1 Overview .................................................................................................................................. 4-28

4.11.2 Configuring MPI and PROFIBUS subnets ............................................................................... 4-30

4.11.2.1 Overview .................................................................................................................................. 4-30

4.11.2.2 Basic principles of MPI and PROFIBUS subnets .................................................................... 4-30

4.11.2.3 Multi-Point Interface (MPI) ....................................................................................................... 4-33

4.11.2.4 PROFIBUS DP interface.......................................................................................................... 4-34

4.11.2.5 Network components of MPI/DP and cable lengths ................................................................ 4-35

4.11.2.6 Cable lengths of MPI and PROFIBUS subnets ....................................................................... 4-40

4.11.3 Configuring PROFINET subnets.............................................................................................. 4-45

4.11.3.1 Overview .................................................................................................................................. 4-45

4.11.3.2 PROFINET nodes .................................................................................................................... 4-45

4.11.3.3 Integration of field bus systems in PROFINET ........................................................................ 4-48

4.11.3.4 PROFINET IO and PROFINET CBA ....................................................................................... 4-49

4.11.3.5 PROFINET cable lengths and network expansion .................................................................. 4-54

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4.11.3.6 Connectors and other components for Ethernet...................................................................... 4-56

4.11.3.7 Example of a PROFINET Subnet ............................................................................................4-57

4.11.3.8 Example of a PROFINET IO system........................................................................................ 4-59

4.11.4 Routed network transitions....................................................................................................... 4-60

4.11.5 Point-to-point (PtP)................................................................................................................... 4-62

4.11.6 Actuator/sensor interface (ASI) ................................................................................................ 4-63

5 Installing .................................................................................................................................................5-1

5.1 Installing an S7-300 ................................................................................................................... 5-1

5.2 Installing the mounting rail ......................................................................................................... 5-3

5.3 Mounting modules onto the rail.................................................................................................. 5-7

5.4 Labeling the modules................................................................................................................. 5-9

6 Wiring ..................................................................................................................................................... 6-1

6.1 Requirements for wiring the S7-300 ..........................................................................................6-1

6.2 Bonding the Protective Conductor to the Mounting Rail ............................................................ 6-3

6.3 Adjusting the Power Supply Module to local Mains Voltage...................................................... 6-4

6.4 Wiring the Power Supply Module and the CPU ......................................................................... 6-5

6.5 Wiring Front Connectors ............................................................................................................ 6-7

6.6 Plugging the front connectors into modules............................................................................. 6-10

6.7 Labeling the module I/O........................................................................................................... 6-11

6.8 Connecting shielded cables to the shielding contact element ................................................. 6-12

6.9 Wiring the MPI / PROFIBUS DP bus connectors..................................................................... 6-15

6.9.1 Wiring the bus connector ......................................................................................................... 6-15

6.9.2 Setting the terminating resistor on the bus connector ............................................................. 6-16

6.10 RJ45 Ethernet connector ......................................................................................................... 6-17

7 Addressing.............................................................................................................................................. 7-1

7.1 Slot-specific addressing of modules .......................................................................................... 7-1

7.2 User-specific addressing of modules.........................................................................................7-3

7.2.1 User-specific addressing of modules ......................................................................................... 7-3

7.2.2 Addressing digital modules ........................................................................................................ 7-3

7.2.3 Addressing analog modules....................................................................................................... 7-5

7.2.4 Addressing the integrated I/Os of CPU 31xC ............................................................................ 7-6

7.3 Consistent data .......................................................................................................................... 7-8

8 Commissioning ....................................................................................................................................... 8-1

8.1 Overview .................................................................................................................................... 8-1

8.2 Commissioning procedure ......................................................................................................... 8-1

8.2.1 Procedure: Commissioning the hardware.................................................................................. 8-1

8.2.2 Procedure: Software commissioning .........................................................................................8-3

8.3 Commissioning check list........................................................................................................... 8-5

8.4 Commissioning the Modules...................................................................................................... 8-7

8.4.1 Inserting/Replacing a Micro Memory Card (MMC)..................................................................... 8-7

8.4.2 Initial power on ........................................................................................................................... 8-9

8.4.3 CPU memory reset by means of mode selector switch ............................................................. 8-9

8.4.4 Formatting the Micro Memory Card (MMC) ............................................................................. 8-12

8.4.5 Connecting the programming device (PG)............................................................................... 8-13

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8.4.5.1 Connecting a PG/PC to the integrated PROFINET interface of the CPU 31x-2 PN/DP ......... 8-13

8.4.5.2 Connecting the PG to a node................................................................................................... 8-14

8.4.5.3 Connecting the PG to several nodes ....................................................................................... 8-15

8.4.5.4 Using the PG for commissioning or maintenance.................................................................... 8-16

8.4.5.5 Connecting a PG to ungrounded MPI nodes (not CPU 31xC) ................................................ 8-17

8.4.6 Starting SIMATIC Manager...................................................................................................... 8-18

8.4.7 Monitoring and modifying I/Os ................................................................................................. 8-19

8.5 Commissioning PROFIBUS DP............................................................................................... 8-23

8.5.1 Commissioning PROFIBUS DP............................................................................................... 8-23

8.5.2 Commissioning the CPU as DP master................................................................................... 8-24

8.5.3 Commissioning the CPU as DP Slave..................................................................................... 8-27

8.5.4 Direct data exchange ............................................................................................................... 8-33

8.6 Commissioning PROFINET IO ................................................................................................ 8-34

8.6.1 Requirements........................................................................................................................... 8-34

8.6.2 Configuring and commissioning the PROFINET IO system .................................................... 8-35

9 Maintenance ........................................................................................................................................... 9-1

9.1 Overview .................................................................................................................................... 9-1

9.2 Backup of firmware to Micro Memory Card (MMC) ................................................................... 9-1

9.3 Updating the firmware from MMC..............................................................................................9-3

9.4 Online (via networks) update of CPU FW V2.2.0 or higher. ...................................................... 9-4

9.5 Backup of project data to a Micro Memory Card (MMC) ........................................................... 9-5

9.6 Module installation / removal ..................................................................................................... 9-6

9.7 Digital output module AC 120/230 V: Changing fuses ............................................................ 9-11

10 Debugging functions, diagnostics and troubleshooting......................................................................... 10-1

10.1 Overview .................................................................................................................................. 10-1

10.2 Overview: Debugging functions ............................................................................................... 10-1

10.3 Overview: Diagnostics ............................................................................................................. 10-4

10.4 Diagnostic Options with STEP 7.............................................................................................. 10-7

10.5 Network Infrastructure Diagnostics (SNMP) ............................................................................ 10-8

10.6 Diagnostics using status and error LEDs................................................................................. 10-9

10.6.1 Introduction .............................................................................................................................. 10-9

10.6.2 Status and error displays of all CPUs .................................................................................... 10-10

10.6.3 Evaluating the SF LED in case of software errors ................................................................. 10-11

10.6.4 Evaluating the SF LED in case of hardware errors................................................................ 10-13

10.6.5 Status and Error Indicators: CPUs with DP Interface ............................................................ 10-14

10.6.6 Status displays: CPUs with PN Interface............................................................................... 10-16

10.7 Diagnostics of DP CPUs ........................................................................................................ 10-18

10.7.1 Diagnostics of DP CPUs operating as DP Master ................................................................. 10-18

10.7.2 Reading out slave diagnostic data......................................................................................... 10-21

10.7.3 Interrupts on the DP Master................................................................................................... 10-25

10.7.4 Structure of slave diagnostic data when the CPU is operated as Intelligent Slave............... 10-27

10.8 Diagnostics of PN CPUs ........................................................................................................ 10-34

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

Table of contents

A Appendix.................................................................................................................................................A-1

A.1 General Rules and Regulations for S7-300 Operation ..............................................................A-1

A.2 Protection against electromagnetic interference........................................................................ A-3

A.2.1 Basic Points for EMC-compliant system installations ................................................................A-3

A.2.2 Five basic rules for securing EMC .............................................................................................A-5

A.2.2.1 1. Basic rule for ensuring EMC ..................................................................................................A-5

A.2.2.2 2. Basic rule for ensuring EMC ..................................................................................................A-5

A.2.2.3 3. Basic rule for ensuring EMC ..................................................................................................A-6

A.2.2.4 4. Basic rule for ensuring EMC ..................................................................................................A-6

A.2.2.5 5. Basic rule for ensuring EMC ..................................................................................................A-7

A.2.3 EMC-compliant installation of PLCs...........................................................................................A-7

A.2.4 Examples of an EMC-compliant installation: Cabinet installation.............................................. A-9

A.2.5 Examples of an EMC-compliant installation: Wall mounting....................................................A-10

A.2.6 Cable shielding.........................................................................................................................A-12

A.2.7 Equipotential bonding...............................................................................................................A-14

A.2.8 Cable routing inside buildings ..................................................................................................A-16

A.2.9 Outdoor routing of cables.........................................................................................................A-18

A.3 Lightning and Surge Voltage Protection ..................................................................................A-18

A.3.1 Overview ..................................................................................................................................A-18

A.3.2 Lightning protection zone concept ...........................................................................................A-19

A.3.3 Rules for the transition point between lightning protection zones 0 <-> 1 ...............................A-21

A.3.4 Rules for the transition point between lightning protection zones 1 <-> 2 and higher.............A-22

A.3.5 Example: Surge protection circuit for networked S7-300 PLCs...............................................A-26

A.3.6 How to Protect Digital Output Modules against Inductive Surge Voltage................................A-28

A.4 Safety of Electronic Control Equipment ...................................................................................A-30

Glossary ..................................................................................................................................... Glossary-1

Index................................................................................................................................................ Index-1

S7-300, CPU 31xC and CPU 31x: Installation

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Table of contents

Tables

Table 1-1

Ambient influence on the automation system (AS).................................................................... 1-1

Table 1-2 Galvanic isolation....................................................................................................................... 1-1

Table 1-3 Communication between sensors/actuators and the PLC......................................................... 1-2

Table 1-4 The use of local and distributed I/O ........................................................................................... 1-2

Table 1-5 Configuration consisting of the Central Unit (CU) and Expansion Modules (EMs) ................... 1-2

Table 1-6 CPU performance ...................................................................................................................... 1-3

Table 1-7 Communication .......................................................................................................................... 1-3

Table 1-8 Software..................................................................................................................................... 1-3

Table 1-9 Supplementary features............................................................................................................. 1-4

Table 3-1 S7-300 components:.................................................................................................................. 3-2

Table 4-1 Mounting rails - Overview .......................................................................................................... 4-4

Table 4-2 Module width.............................................................................................................................. 4-4

Table 4-3 Shielding terminals - Overview ..................................................................................................4-5

Table 4-4 Interface modules - Overview ....................................................................................................4-8

Table 4-5 Cabinet types ........................................................................................................................... 4-13

Table 4-6 Cabinet selection ..................................................................................................................... 4-15

Table 4-7 VDE specifications for the installation of a PLC system .......................................................... 4-16

Table 4-8 Measures for protective grounding .......................................................................................... 4-22

Table 4-9 Connecting the load voltage reference potential ..................................................................... 4-23

Table 4-10 Connecting the load voltage reference potential ..................................................................... 4-24

Table 4-11 Connecting the load voltage reference potential ..................................................................... 4-25

Table 4-12 Features of load power supply units ........................................................................................ 4-26

Table 4-13 Subnet nodes........................................................................................................................... 4-31

Table 4-14 MPI/PROFIBUS DP addresses................................................................................................ 4-31

Table 4-15 MPI addresses of CPs/FMs in an S7-300 system ................................................................... 4-32

Table 4-16 Operating modes for CPUs with two DP interfaces................................................................. 4-34

Table 4-17 Permissible cable length of a segment on the MPI subnet...................................................... 4-35

Table 4-18 Permissible cable length of a segment on the PROFIBUS subnet.......................................... 4-35

Table 4-19 Lengths of stub cables per segment........................................................................................ 4-36

Table 4-20 PG patch cord .......................................................................................................................... 4-36

Table 4-21 Available bus cables ................................................................................................................ 4-37

Table 4-22 Properties of PROFIBUS cables.............................................................................................. 4-37

Table 4-23 Marginal conditions for wiring interior bus cables.................................................................... 4-38

Table 4-24 Bus connector .......................................................................................................................... 4-38

Table 4-25 Data for twisted-pair patch cables............................................................................................ 4-55

Table 5-1 Module accessories ................................................................................................................... 5-2

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Table 5-2 Installation tools and materials................................................................................................... 5-3

Table 5-3 Mounting holes for rails.............................................................................................................. 5-5

Table 5-4 Slot numbers for S7 modules.....................................................................................................5-9

Table 6-1 Wiring accessories..................................................................................................................... 6-1

Table 6-2 Tools and material for wiring...................................................................................................... 6-1

Table 6-3 Wiring conditions for PS and CPU ............................................................................................. 6-2

Table 6-4 Wiring conditions for front connectors........................................................................................ 6-2

Table 6-5 Assignment of front connectors to modules............................................................................... 6-7

Table 6-6 Wiring front connectors .............................................................................................................. 6-9

Table 6-7 Inserting the front connector .................................................................................................... 6-10

Table 6-8 Labeling strip assignment to modules...................................................................................... 6-11

Table 6-9 Shielding diameter assignment to shielding terminals............................................................. 6-12

Table 7-1 Integrated I/Os of CPU 312C .....................................................................................................7-6

Table 7-2 Integrated I/Os of CPU 313C .....................................................................................................7-6

Table 7-3 Integrated I/Os of CPU 313C-2 PtP/DP..................................................................................... 7-7

Table 7-4 Integrated I/Os of CPU 314C-2 PtP/DP..................................................................................... 7-7

Table 8-1 Recommended commissioning procedure: Hardware............................................................... 8-2

Table 8-2 Recommended commissioning procedure - Part II: Software ................................................... 8-4

Table 8-3 Possible reasons of a CPU request to reset memory................................................................ 8-9

Table 8-4 Procedure for CPU memory reset............................................................................................ 8-10

Table 8-5 Internal CPU events on memory reset..................................................................................... 8-11

Table 8-6 Software requirements............................................................................................................. 8-23

Table 8-7 DP address areas of the CPUs................................................................................................ 8-23

Table 8-8 Event recognition by CPUs 31x-2 DP/31xC-2 DP operating as DP master ............................ 8-25

Table 8-9 Event recognition by CPUs 31x-2 DP/31xC-2 DP as DP slave............................................... 8-28

Table 8-10 Configuration example for the address areas of transfer memory........................................... 8-30

Table 8-11 PROFINET IO address areas of the CPUs.............................................................................. 8-35

Table 8-12 CPU startup for operation as IO controller............................................................................... 8-39

Table 8-13 Event detection by the CPU 31x-2 PN/DP operating as IO controller ..................................... 8-39

Table 9-1 Firmware backup to MMC..........................................................................................................9-2

Table 9-2 Updating the firmware from MMC.............................................................................................. 9-3

Table 10-1 The differences between forcing and modifying variables....................................................... 10-4

Table 10-2 Status and error displays ....................................................................................................... 10-10

Table 10-3 Evaluation of the SF LED (software error) ............................................................................. 10-11

Table 10-4 Evaluation of the SF LED (Hardware error)........................................................................... 10-13

Table 10-5 BUSF, BUSF1 and BUSF2 LEDs .......................................................................................... 10-14

Table 10-6 BUSF LED is lit ...................................................................................................................... 10-14

Table 10-7 BUSF LED flashes ................................................................................................................. 10-15

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Table 10-8 BF2/ BUSF LED is lit.............................................................................................................. 10-17

Table 10-9 BF2/ BUSF LED flashes on a PROFINET IO controller ........................................................ 10-17

Table 10-10 Event detection of CPU 31x#2 operating as DP master ........................................................ 10-20

Table 10-11 Evaluating RUN to STOP transitions of the DP slave in the DP master................................ 10-20

Table 10-12 Reading out diagnostic data in the master system, using STEP 5 and STEP 7 ................... 10-21

Table 10-13 Event recognition of CPUs 31x-2 operating in DP slave mode ............................................. 10-24

Table 10-14 Evaluating RUN#STOP transitions in the DP Master/DP Slave............................................. 10-25

Table 10-15 Structure of Station Status 1 (Byte 0) .................................................................................... 10-28

Table 10-16 Structure of Station Status 2 (Byte 1) .................................................................................... 10-28

Table 10-17 Structure of Station Status 3 (Byte 2) .................................................................................... 10-29

Table 10-18 Structure of the Master PROFIBUS address (byte 3)............................................................ 10-29

Table 10-19 Structure of the manufacturer ID (byte 4 and 5).................................................................... 10-29

Table A-1 System startup after specific events .......................................................................................... A-1

Table A-2 Mains voltage............................................................................................................................. A-2

Table A-3 Protection against external electrical interference..................................................................... A-2

Table A-4 Protection against external electrical interference..................................................................... A-2

Table A-5 Coupling mechanisms................................................................................................................A-4

Table A-1 Key to example 1 ..................................................................................................................... A-10

Table A-2 Cable routing inside buildings..................................................................................................A-16

Table A-3 High#voltage protection of cables with the help of surge protection equipment ......................A-21

Table A-4 Surge-protection components for lightning protection zones 1 <-> 2...................................... A-24

Table A-5 Surge-protection components for lightning protection zones 2 <-> 3...................................... A-25

Table A-6 Example of a circuit conforming to lightning protection requirements (legend to previous figure)

.................................................................................................................................................A-27

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S7-300, CPU 31xC and CPU 31x: Installation

xiv Operating Instructions, Edition 08/2004, A5E00105492-05

Guide to the S7-300 documentation

Overview

This guide leads you through the S7-300 documentation.

Selecting and configuring

Table 1-1 Ambient influence on the PLC

Information on.. is available in ... What provisions do I have to make for PLC installation

space?

How do environmental conditions influence the PLC? S7-300, CPU 31xC and CPU 31x Manual: Installation:

Table 1-2 Galvanic isolation

Information on.. is available in ... Which modules can I use if electrical isolation is required

between sensors/actuators?

Under what conditions do I have to isolate the modules electrically?

How do I wire it?

Under which conditions do I have to isolate stations electrically?

How do I wire it?

S7-300, CPU 31xC and CPU 31x Manual: Installation: Configuring - Component dimensions

S7-300, CPU 31xC and CPU 31x Manual: Installation: Mounting - Installing the mounting rail

Appendix

S7-300, CPU 31xC and CPU 31x Operating Instructions: Installation: Configuring – Electrical assembly, protective measures and grounding

Module data Manual S7-300, CPU 31xC and CPU 31x operating instructions:

Installation: Configuring – Electrical assembly, protective measures and grounding

CPU 31xC and CPU 31x operating instructions: Installation: Wiring

S7-300, CPU 31xC and CPU 31x operating instructions: Installation – Configuring – Configuring subnets

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

1-1

Guide to the S7-300 documentation

Table 1-3 Communication between sensors/actuators and the PLC

Information on.. is available in ... Which module is suitable for my sensor/actuator? For CPU: CPU 31xC and CPU 31x Manual, Technical Data

For signal modules: Reference manual of your signal module

How many sensors/actuators can I connect to the module? For CPU: CPU 31xC and CPU 31x Manual, technical data

of signal modules: Reference manual of your signal module

To connect my sensors/actuators to the PLC, how do I wire the front connector?

When do I need expansion modules (EM) and how do I connect them?

How to mount modules on racks / mounting rails S7-300, CPU 31xC and CPU 31x operating instructions:

S7-300, CPU 31xC and CPU 31x operating instructions: Installation: Wiring – Wiring the front connector

S7-300, CPU 31xC and CPU 31x operating instructions: Installation: Configuring – Distribution of modules to several racks

Installation: Assembly – Installing modules on the mounting rail

Table 1-4 The use of local and distributed I/O

Information on.. is available in ... Which range of modules do I want to use? For local I/O and expansion devices: Module Data reference

manual For distributed I/O and PROFIBUS DP: Manual of the

relevant I/O device

Table 1-5 Configuration consisting of the Central Unit (CU) and Expansion Modules (EMs)

Information on.. is available in ... Which rack / mounting rail is most suitable for my

application? Which interface modules (IM) do I need to connect the EMs

to the CU?

What is the right power supply (PS) for my application? S7-300, CPU 31xC and CPU 31x operating instructions:

S7-300, CPU 31xC and CPU 31x operating instructions: Installation: Configuring

S7-300, CPU 31xC and CPU 31x operating instructions: Installation: Configuring – Distribution of modules to several racks

Installation: Configuring

S7-300, CPU 31xC and CPU 31x: Installation

1-2 Operating Instructions, Edition 08/2004, A5E00105492-05

Guide to the S7-300 documentation

Table 1-6 CPU performance

Information on.. is available in ... Which memory concept is best suited to my application? CPU 31xC and CPU 31x Manual, Technical Data How do I insert and remove Micro Memory Cards? S7-300, CPU 31xC and CPU 31x operating instructions:

Installation: Commissioning – Commissioning modules –

Removing / inserting a Micro Memory Card (MMC) Which CPU meets my demands on performance? S7-300 instruction list: CPU 31xC and CPU 31x Length of the CPU response / execution times CPU 31xC and CPU 31x Manual, Technical Data Which technological functions are implemented? Technological Functions Manual How can I use these technological functions? Technological Functions Manual

Table 1-7 Communication

Information on.. is available in ... Which principles do I have to take into account? Communication with SIMATIC Manual

PROFINET System Manual, System Description Options and resources of the CPU CPU 31xC and CPU 31x Manual, Technical Data How to use communication processors (CPs) to optimize

communication Which type of communication network is best suited to my

application? How to network the various components S7-300, CPU 31xC and CPU 31x operating instructions:

What to take into account when configuring PROFInet networks

CP Manual

S7-300, CPU 31xC and CPU 31x operating instructions:

Installation: Configuring – Configuring subnets

SIMATIC NET Manual, Twisted-Pair and Fiber Optic

Networks (6GK1970-1BA10-0AA0) – Network Configuration

PROFINET System Manual, System Description –

Installation and Commissioning

Table 1-8 Software

Information on.. is available in ... Software requirements of my S7-300 system CPU 31xC and CPU 31x Manual, Technical Data –

Technical Data

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

1-3

Guide to the S7-300 documentation

Table 1-9 Supplementary features

Information on.. is available in ... How to implement operating and monitoring functions

(Human Machine Interface)

How to integrate process control modules For PCS7: The relevant Manual Options of redundant and fail-safe systems S7-400H Manual – Redundant Systems

Information to be observed when migrating from PROFIBUS DP to PROFINET IO

For text-based displays: The relevant Manual For Operator Panels: The relevant Manual For WinCC: The relevant Manual

Fail-Safe Systems Manual Programming Manual: From PROFIBUS DP to PROFINET

S7-300, CPU 31xC and CPU 31x: Installation

1-4 Operating Instructions, Edition 08/2004, A5E00105492-05

Installation Order

We will start by showing you the sequence of steps you have to follow to install your system. Then we will go on to explain the basic rules that you should follow, and how you can modify an existing system.

Installation procedure

Configuring

Do you want to

set up a subnet?

Mounting

Wiring

YES

Networking

Addressing

Installation completed,

continue with commissioning

Basic rules for trouble-free operation of the S7 system

In view of the many and versatile applications, we can only provide basic rules for the electrical and mechanical installation in this section.

You have to at least keep to these basic rules in order to obtain a fully functional SIMATICS7 system.

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

2-1

Installation Order

Modifying the existing S7 system structure

To modify the configuration of an existing system, proceed as described earlier.

Reference

Note When adding a new signal module, always refer to the relevant module information.

Also refer to the description of the various modules in the manual:

Automation Systems, Module Data Reference Manual

SIMATIC S7-300

S7-300, CPU 31xC and CPU 31x: Installation

2-2 Operating Instructions, Edition 08/2004, A5E00105492-05

S7-300 components

3.1 Example of an S7-300 configuration

123

BUSF

DC5V

FRCE

RUN

STOP

BUSF

DC5V

FRCE

RUN

STOP

The figure illustrates the following

(1) Power supply (PS) module (2) Central processing unit (CPU)

(3) Signal module (SM) (4) PROFIBUS bus cable (5) Cable for connecting a programming device (PG)

You use a programming device (PG) to program the S7300 PLC. Use the PG cable to interconnect the PG with the CPU.

To commission or program a CPU with PROFINET interface, you may also use an Ethernet cable to interconnect the PG with the PROFINET connector of the CPU. Please note that you need to adjust the Ethernet interface on your PG.

Several S7-300 CPUs communicate with one another and with other SIMATIC S7 PLCs via the PROFIBUS cable. Several S7-300 are connected via the PROFIBUS bus cable.

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

the following S7-300 components

The example in the figure shows a CPU 31xC with integrated I/O.

3-1

S7-300 components

SIEMENS

3.2 Overview of the vital modules of an S7-300

You can choose from a number of modules for installing and commissioning the S7-300. The most important modules and their functions are shown below.

Table 3-1 S7-300 components:

Component Function Illustration Mounting rail

Accessories:

• Shielding terminal

Power supply (PS) module The PS converts the line voltage

S7-300 racks

(120/230 VAC) into a 24 VDC operating voltage, and supplies the S7-300 and its 24 VDC load circuits.

CPU Accessories:

• Front connectors (CPU 31xC only)

The CPU executes the user program, supplies 5 V to the S7-300 backplane bus, and communicates with other nodes of an MPI network via the MPI interface.

Additional features of specific CPUs:

• DP master or DP slave on a PROFIBUS subnet

• Technological functions

• PtP communication

• Ethernet communication via

integrated PROFINET interface

SIEMENS

A CPU 31xC, for example

A CPU 312, 314, or 315-2 DP, for example

A CPU 317, for example

S7-300, CPU 31xC and CPU 31x: Installation

3-2 Operating Instructions, Edition 08/2004, A5E00105492-05

S7-300 components

3.2 Overview of the vital modules of an S7-300

Component Function Illustration Signal modules (SM)

• Digital input modules

• Digital output modules

• Digital I/O modules,

• Analog input modules

• Analog output modules

• Analog I/O modules

Accessories:

• Front connectors

Function modules (FM) Accessories:

• Front connectors

The SM matches different process signal levels to the S7-300.

The FM performs time-critical and memory-intensive process signal processing tasks.

Positioning or controlling, for example

Communication processor (CP) Accessories: Connecting cable

SIMATIC TOP connect Accessories:

• Front connector module with ribbon cable terminals

Interface module (IM) Accessories:

• Connecting cable

PROFIBUS cable with bus connector Interconnect the nodes of an MPI or

The CP relieves the CPU of communication tasks.

Example: CP 342-5 DP for connecting to PROFIBUS DP

Wiring of digital modules

The IM interconnects the various rows in an S7-300

PROFIBUS subnet

PG cable Connects a PG/PC to a CPU

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

3-3

S7-300 components

3.2 Overview of the vital modules of an S7-300

Component Function Illustration RS 485 repeater The repeater is used to amplify the

signals and to couple segments of an MPI or PROFIBUS subnet.

Switch A switch is used to interconnect the

Twisted-pair cables with RJ45 connectors.

Ethernet nodes.

Interconects devices with Ethernet interface (a switch with a CPU 317-2 PN/DP, for example)

Programming device (PG) or PC with the STEP 7 software package

You need a PG to configure, set parameters, program and test your S7-300

S7-300, CPU 31xC and CPU 31x: Installation

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Configuring

4.1 Overview

There, you can find all the necessary information

• for the mechanical configuration of an S7-300,

• for the electrical configuration of an S7-300,

• that has to be observed in networking.

Reference

• For further information, refer to the (6ES7398-8EA00-8AA0), or

• the

4.2 Basic engineering principles

SIMATIC NET Twisted-Pair and Fiber-Optic Networks

(6GK1970-1BA10-0AA0)

Communication with SIMATIC

Manual

manual

Important information for engineering

Warning Open equipment

S7-300 modules are open equipment. That is, the S7-300 must be installed in a cubicle, cabinet or electrical control room which can only be accessed using a key or tool. Only trained or authorized personnel are allowed access to such cubicles, cabinets or electrical operating rooms.

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

4-1

Configuring

4.2 Basic engineering principles

Caution Operation of an S7-300 in plants or systems is defined by special set of rules and

regulations, based on the relevant field of application. Observe the safety and accident prevention regulations for specific applications, for example, the machine protection directives. This chapter and the appendix provide an overview of the most important rules you need to observe when integrating an S7-300 into a plant or a system.

General rules and regulations on S7-300 operatio

Central unit (CU) and expansion module (EM)

An S7-300 PLC consists of a central unit (CU) and of one or multiple expansion modules. The rack containing the CPU is the central unit (CU). Racks equipped with modules and

connected to the CU form the expansion modules (EMs) of the system.

Use of an expansion module (EM)

You can use EMs if the CU runs out of slots for your application. When using EMs, you might require further power supply modules in addition to the extra

racks and interface modules (IM). When using interface modules you must ensure compatibility of the partner stations.

Racks

The rack for your S7-300 is a mounting rail. You can use this rail to mount all modules of your S7-300 system.

S7-300, CPU 31xC and CPU 31x: Installation

4-2 Operating Instructions, Edition 08/2004, A5E00105492-05

Configuring

DC5V

FRCE

RUN

STOP

4.2 Basic engineering principles

Horizontal and vertical installation

You can mount an S7-300 either vertically or horizontally. The following ambient air temperatures are permitted:

• Vertical assembly: 0 °C to 40 °C

• Horizontal assembly: 0 °C to 60 °C

Always install the CPU and power supply modules on the left or at the bottom.

DC5V

FRCE

RUN

STOP

CPU

DC5

FRCE

RUN

STOP

The figure illustrates the following (1) the vertical installation of an S7-300 (2) the horizontal installation of an S7-300 (3) the mounting rail

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

4-3

Configuring

4.3 Component dimensions

Length of the mounting rails

Table 4-1 Mounting rails - Overview

Mounting rail length Usable length for modules Order number 160 mm 120 mm 6ES7 390-1AB60-0AA0

482.6 mm 450 mm 6ES7 390-1AE80-0AA0 530 mm 480 mm 6ES7 390-1AF30-0AA0 830 mm 780 mm 6ES7 390-1AJ30-0AA0 2000 mm cut to length as required 6ES7 390-1BC00-0AA0

In contrast to other rails, the 2 m mounting rail is not equipped with any fixing holes. These must be drilled, allowing optimal adaptation of the 2 m rail to your application.

Dimensions of modules

Table 4-2 Module width

Module Width Power supply module PS 307, 2 A 50 mm Power supply module PS 307, 5 A 80 mm Power supply module PS 307, 10 A 200 mm CPU For information on assembly dimensions,

refer to the Technical Data in

CPU 31x Manual, Technical Data

Analog I/O modules 40 mm Digital I/O modules 40 mm Simulator module SM 374 40 mm Interface modules IM 360 and IM 365 40 mm Interface module IM 361 80 mm

CPU 31xC and

• Module height: 125 mm

• Module height with shielding contact element: 185 mm

• Maximum assembly depth: 130 mm

• Maximum assembly depth of a CPU with an inserted DP connector with angled cable

feed: 140 mm

• Maximum assembly depth with open front panel (CPU): 180 mm Dimensions of other modules such as CPs, FMs etc. are found in the relevant manuals.

S7-300, CPU 31xC and CPU 31x: Installation

4-4 Operating Instructions, Edition 08/2004, A5E00105492-05

Configuring

4.3 Component dimensions

Shielding contact element

The direct contact between the shielding contact element and the mounting rail makes it easy for you to connect all shielded cables of your S7 modules to ground.

CPU

The figure illustrates the following (1) Shielding terminals (2) The bracket.

Mount the bracket (order no. 6ES5 390-5AA0-0AA0) to the rail using the two screw bolts. If you use a shielding contact element, the specified dimensions are measured from the base of the element.

• Width of the shielding contact element: 80 mm

• Mountable shielding terminals per shielding contact element max. 4

Table 4-3 Shielding terminals - Overview

Cable with shielding diameter Shielding terminal order no. Cable with 2 mm to 6 mm shielding diameter 6ES7 390–5AB00–0AA0 Cable with 3 mm to 8 mm shielding diameter 6ES7 390–5BA00–0AA0 Cable with 4 mm to 13 mm shielding diameter 6ES7 390–5CA00–0AA0

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

4-5

Configuring

4.4 Required clearances

You must maintain the clearance shown in the figure in order to provide sufficient space for installing the modules, and to allow the dissipation of heat generated by the modules.

The S7-300 assembly on multiple racks shown in the figure below shows the clearance between racks and adjacent components, cable ducts, cabinet walls etc.

For example, when routing your module wiring through cable duct, the minimum clearance between the bottom of the shielding contact element and the cable duct is 40 mm.

PP

PP

PP

&38





PPD

PP

The figure illustrates the following (1) Wiring with cable duct (2) Minimum clearance between the cable duct and the bottom edge of the shielding contact

element is 40 mm

S7-300, CPU 31xC and CPU 31x: Installation

4-6 Operating Instructions, Edition 08/2004, A5E00105492-05

Configuring

4.5 Arrangement of modules on a single rack

Reasons for using one or multiple racks

The number of racks you need will depend on your application.

Reasons for using a single rack: Reasons for distributing modules between

several racks

• Compact, space-saving use of all your modules

• Local use of all modules

• Fewer signals to be processed

• More signals to be processed

• Insufficient number of slots

Note If you opt for the installation on a single rack, insert a dummy module to the right of the CPU

(order no.: 6ES7 370-0AA01-0AA0). This gives you the option of adding a second rack for your application, simply by replacing the dummy module with an interface module, and without having to reinstall and rewire the first rack.

Rules: Layout of modules on a single module rack

The following rules apply to module installations on a single rack:

• No more than eight modules (SM, FM, CP) may be installed to the right of the CPU.

• The accumulated power consumption of modules mounted on a rack may not exceed

1.2 A on the S7-300 backplane bus.

Reference

For further information, refer to the technical data, for example, in the

Specifications Reference Manual

Example

The figure below shows a layout with eight signal modules in an S7-300 assembly.

or in the

Reference Manual

S7-300 Module

for your CPU.

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

CPU

SM1

SM2

SM3

SM4

SM5

SM6

SM7

SM8

4-7

Configuring

4.6 Distribution of modules to several racks

Exceptions

With CPU 312 and CPU 312C, only a single-row configuration on a rack is possible.

Using interface modules

If you are planning an assembly in multiple racks, then you will need interface modules (IM). Interface modules route the backplane bus of an S7-300 to the next rack.

The CPU is always located on rack 0.

Table 4-4 Interface modules - Overview

Properties Two or more rows Cost-effective 2-row configuration Send IM in rack 0 IM 360

order no..: 6ES7 360-3AA01-0AA0

Receiver IM in racks 1 to 3 IM 361

order no..: 6ES7 361-3CA01-0AA0

Maximum number of expansion modules

Length of connecting cables 1 m (6ES7 368-3BB01-0AA0)

Remarks - Rack 1 can only receive signal modules;

3 1

2.5 m (6ES7 368-3BC51-0AA0) 5 m (6ES7 368-3BF01-0AA0) 10 m (6ES7 368-3CB01-0AA0)

IM 365 order no..: 6ES7 365-0AB00-0AA0

IM 365 (hard-wired to send IM 365)

1 m (hard-wired)

the accumulated current load is limited to

1.2 A, whereby the maximum for rack 1 is

0.8 A These restrictions do not apply to operation

with interface modules IM 360/IM 361

S7-300, CPU 31xC and CPU 31x: Installation

4-8 Operating Instructions, Edition 08/2004, A5E00105492-05

Configuring

4.6 Distribution of modules to several racks

Rules: arrangement of the modules on several racks

Please note the following points if you wish to arrange your modules on multiple racks:

• The IM always uses slot 3 (slot 1: power supply module; slot 2: CPU, slot 3: Interface module)

• It is always on the left before the first signal module.

• No more than 8 modules (SM, FM, CP) are permitted per rack.

• The number of modules (SM, FM, CP) is limited by the permitted current consumption on

the S7-300 backplane bus. The accumulated power consumption may not exceed 1.2 A per row.

Note For information on the power consumption of the various modules, refer to the

Specifications Reference Manual.

Module

Rules: Interference-proof interfacing

Special shielding and grounding measures are not required if you interconnect the CU and EM using suitable interface modules (Send IM and Receive IM).

However, you must ensure

• a low impedance interconnection of all racks,

• that the racks of a grounded assembly are grounded in a star pattern,

• that the contact springs on the racks are clean and not bent, thus ensuring that

interference currents are properly discharged to ground.

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

4-9

Configuring

4.6 Distribution of modules to several racks

Example: Full assembly using four racks

The figure shows the arrangement of modules in an S7-300 assembly on 4 racks.

SM4

SM5

SM6

SM7

SM8

SM3

SM2

SM1

SM3

SM2

SM1

SM3

SM2

SM1

CPU

SM1

SM2

SM3

SM4

SM5

SM6

SM7

SM8

The figure illustrates the following (1) Rack 0 (central unit) (2) Rack 1 (expansion module) (3) Rack 2 (expansion module) (4) Rack 3 (expansion module) (5) The connecting cable 368 (6) Restriction for CPU 31xC. When this CPU is used, do not insert SM 8 into Rack 4.

S7-300, CPU 31xC and CPU 31x: Installation

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Configuring

4.7 Selection and installation of cabinets

Reasons for installing an S7-300 in a cabinet

Your S7-300 should be installed in a cabinet,

• if you plan a larger system,

• if you are using your S7-300 systems in an environment subject to interference or

contamination, and

• to meet UL/CSA requirements for cabinet installation.

Selecting and dimensioning cabinets

Take the following criteria into account:

• ambient conditions at the cabinet's place of installation

• the specified mounting clearance for racks (mounting rails)

• accumulated power loss of all components in the cabinet.

The ambient conditions (temperature, humidity, dust, chemical influence, explosion hazard) at the cabinet's place of installation determine the degree of protection (IP xx) required for the cabinet.

Reference for degrees of protection

For further information on the degrees of protection, refer to IEC 529 and DIN 40050.

The power dissipation capability of cabinets

The power dissipation capability of a cabinet depends on its type, ambient temperature and on the internal arrangement of devices.

Reference for power loss

For detailed information on power dissipation, refer to the Siemens catalogs NV21 and ET1.

Specification of cabinet dimensions

Note the following specifications when you determine the dimensions of a cabinet for your S7-300 installation:

• Space required for racks (mounting rails)

• Minimum clearance between the racks and cabinet walls

• Minimum clearance between the racks

• Space required for cable ducts or fan assemblies

• Position of the stays

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

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Configuring

4.7 Selection and installation of cabinets

Warning Modules may get damaged if exposed to excess ambient temperatures.

Reference for ambient temperatures

For information on permitted ambient temperatures, refer to the

Module data

Reference Manual.

S7-300 Automation System,

S7-300, CPU 31xC and CPU 31x: Installation

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Configuring

4.7 Selection and installation of cabinets

Overview of typical cabinet types

The table below gives you an overview of commonly used cabinet types. It shows you the applied principle of heat dissipation, the calculated maximum power loss and the degree of protection.

Table 4-5 Cabinet types

Open cabinets Closed cabinets Enclosed ventilation by

means of natural convection

Increased enclosed ventilation

Natural convection Forced convection with

rack fan, improvement of natural convection

Forced convection with heat exchanger, internal and external auxiliary ventilation

Mainly inherent heat dissipation, with a small portion across the cabinet wall.

Degree of protection IP 20

Typical power dissipation under following marginal conditions:

• Cabinet size: 600 mm x 600 mm x 2,200 mm

• Difference between the outer and inner temperature of the cabinet is 20 °C (for other temperature differences refer to

the temperature charts of the cabinet manufacturer)

up to 700 W up to 2,700 W (with

Higher heat dissipation with increased air movement.

Degree of protection IP 20

fine filter up to 1,400 W)

Heat dissipation only across the cabinet wall; only low power losses permitted. In most cases, the heat accumulates at the top of the cabinet interior.

Degree of protection IP 54

up to 260 W up to 360 W up to 1,700 W

Heat dissipation only across the cabinet wall. Forced convection of the interior air improves heat dissipation and prevents heat accumulation.

Degree of protection IP 54

Heat dissipation by heat exchange between heated internal air and cool external air. The increased surface of the pleated profile of the heat exchanger wall and forced convection of internal and external air provide good heat dissipation.

Degree of protection IP 54

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

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Configuring

4.8 Example: Selecting a cabinet

Introduction

The sample below clearly shows the maximum permitted ambient temperature at a specific power loss for different cabinet designs.

Installation

The following device configuration should be installed in a cabinet:

• Central unit, 150 W

• Expansion modules, each with 150 W

• Load power supply under full load, 200 W

This results in an accumulated power loss of 650 W.

Power loss dissipated

The diagram in the figure below shows guide values for the permitted ambient temperature of a cabinet with the dimensions 600 mm x 600 mm x 2,000 mm, based on the accumulated power loss. These values only apply if you maintain the specified assembly and clearance dimensions for racks (rails).

Ambient temperature in °C

200

400 600 800 1000 1200

Power loss in W

1400

Trend shows you the following cabinet type (1) Closed cabinet with heat exchanger (heat exchanger size 11/6

(920 mm x 460 mm x 111 mm) (2) Cabinet with through-ventilation by natural convection (3) Closed cabinet with natural convection and forced convection by equipment fans

S7-300, CPU 31xC and CPU 31x: Installation

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Configuring

4.9 Electrical assembly, protective measures and grounding

Result

The figure below shows the resultant ambient temperatures, based on an accumulated power loss of 650 W:

Table 4-6 Cabinet selection

Cabinet design Maximum permitted ambient

temperature

Closed with natural convection and forced convection (trend

3) Open with through-ventilation (trend 2) approx. 38 °C Closed with heat exchanger (trend 1) approx. 45 °C

Cabinet types suitable for horizontal installation of the S7-300:

• open, with closed ventilation

• closed, with heat exchanger

Operation not possible

4.9 Electrical assembly, protective measures and grounding

4.9.1 Grounding concept and overall structure

This section contains information about the overall configuration of an S7-300 connected to a grounded TN-S network:

• Circuit-breaking devices, short-circuit and overload protection to VDE 0100 and VDE 0113

• Load power supplies and load circuits

• Grounding concept

Definition: Grounded mains

Note An S7-300 can be used in many different ways, so we can only describe the basic rules

for the electrical installation in this document. Those basic rules are a must in order to achieve a fully functional S7-300 system.

In a grounded mains network, the neutral conductor is always bonded to ground. A shortcircuit to ground of a live conductor, or of a grounded part of the system, trips the protective devices.

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

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Configuring

4.9 Electrical assembly, protective measures and grounding

Specified components and protective measures

A number of components and protective measures are prescribed for plant installations. The type of components and the degree of compulsion pertaining to the protective measures will depend on the VDE specification applicable to your particular plant.

The table below shows components and protective measures.

Table 4-7 VDE specifications for the installation of a PLC system

Compare ... 1) VDE 0100 VDE 0113 Disconnect devices for control

systems, signal generators and final control elements

Short-circuit / overload protection:

In groups for signal generators and final control elements

Load power supply for AC load circuits with more than five electromagnetic devices

(1) ...Part 460:

Master switch

(2) ...Part 725:

Single-pole fusing of circuits

(3) Galvanic isolation by

transformer recommended

... Part 1: Load disconnect switch

... Part 1:

• With grounded secondary power circuit: single-pole fusing

• Otherwise: fusing of all poles

Electrical isolation by transformer mandatory

1) This column refers to the indexes of the figure in the chapter Overview: Grounding.

Reference

For further information on protective measures, refer to the Appendix.

4.9.2 Installing an S7-300 with grounded reference potential

Introduction

During installation of an S7-300 with grounded reference potential interference current is discharged to the ground conductor / to earth. A grounding slide contact is used for this except with CPU 31xC.

Note Your CPU is supplied with grounded reference potential. Therefore, if you wish to install an

S7-300 with grounded reference potential, you do not need to modify your CPU!

S7-300, CPU 31xC and CPU 31x: Installation

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4.9 Electrical assembly, protective measures and grounding

Grounded reference potential of the CPU 31x

The figure shows an S7-300 configuration with grounded reference potential (factory state.)

L+

10M

<100 nF

The figure illustrates the following (1) Grounding slide contact in grounded state (2) Ground of the internal CPU circuitry (3) The mounting rail

Note Do not pull out the grounding slide contact when you install an S7-300 with grounded

reference potential.

4.9.3 Configuring an S7-300 with ungrounded reference potential (not CPU 31xC)

Introduction

During installation of an S7-300 with ungrounded reference potential interference currents are discharged to the ground conductor / to ground via an RC combination integrated in the CPU.

Note An S7-300 with a CPU 31xC cannot be configured ungrounded.

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4.9 Electrical assembly, protective measures and grounding

Application

In large systems, the S7-300 may require a configuration with grounded reference potential due to ground-fault monitoring. This is the case, for example, in chemical industry and power stations.

Ungrounded reference potential of the CPU 31x

The figure shows an S7-300 configuration with floating potential

L+

10M

<100 nF

The figure illustrates the following (1) How to implement an ungrounded reference potential in your CPU: Use a screwdriver with

3.5 mm blade width to push the grounding slide contact forwards in the direction of the arrow

until it snaps into place. (2) Ground of the internal CPU circuitry (3) The mounting rail.

Note You should set up the ungrounded reference potential before you mount the device on the

rail. If you have already installed and wired up the CPU, you may have to disconnect the MPI interface before you pull out the grounding slide contact.

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4.9 Electrical assembly, protective measures and grounding

4.9.4 Modules with isolated or common potential?

Isolated modules

Isolated modules are installed with galvanic isolation between the reference potentials of the control circuit (M

Field of application

Use isolated modules for:

• All AC load circuits

• DC load circuits with separate reference potential

Examples: – DC load circuits containing sensors which are connected to different reference

potentials (for example, if grounded sensors are located at a considerable distance from the control system and equipotential bonding is not possible)

– DC load circuits with grounded positive pole (L+) (battery circuits.)

) and load circuit (M

internal

external

Isolated modules and grounding concept

You can always use isolated modules, irrespective of the grounding state of the control system's reference potential.

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4.9 Electrical assembly, protective measures and grounding

Example: Assembly with CPU 31xC and isolated modules

The figure below shows an example of such a configuration: A CPU 31xC with isolated modules. The CPU 31xC (1) is automatically grounded.

Common grounding line in the cabinet

L+

external

24 V DC load power supply

Common potential modules

In a configuration containing modules with common potential, the reference potentials of the control circuit (M

S7-300 CPU

L+

) and analog circuit (M

internal

µP

) are not galvanically isolated.

analog

230 V AC load power supply

internal

Data M

internal

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4.9 Electrical assembly, protective measures and grounding

Example: Installing an S7-300 with common potential modules

When using an SM 334 AI 4/AO 2 analog I/O module, connect one of the grounding terminals M

The figure below shows an example of such a configuration: An S7-300 with common potential modules

to the CPU's chassis ground.

analog

L+

external

24 V DC load power supply

Common grounding line in the cabinet

L+

S7-300 CPU

1 mm

4AI/2AO

interna

Data M

interna

analog

4.9.5 Grounding measures

Bonding to ground

Low-impedance connections to ground reduce the risk of electric shock as a result of a short-circuit or system fault. Low-impedance connections (large surface, large-surface contact) reduce the effects of interference on the system or the emission of interference signals. An effective shielding of cables and devices is also a significant contribution.

Warning All protection class 1 devices, and all larger metal parts, must be bonded to protective

ground. That is the only way to safely protect operators from electrical shock. This also discharges any interference transmitted from external power supply cables, signal cables or cables to the I/O devices.

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4.9 Electrical assembly, protective measures and grounding

Measures for protective grounding

The table below shows an overview of the most important measures for protective grounding.

Table 4-8 Measures for protective grounding

Device Measures Cabinet / mounting frame Connection to central ground (equipotential busbar, for example)

using cables with protective conductor quality

Rack / mounting rail Connection to central ground, using cables with a minimum cross-

section of 10 mm

interconnected with larger metallic parts. Module None I/O Device Grounding via grounding-type plug Sensors and final control

elements

Grounding in accordance with regulations applying to the system

, if the rails are not installed in the cabinet and not

Rule: Connect the cable shielding to ground

You should always connect both ends of the cable shielding to ground / system ground. This is the only way to achieve an effective interference suppression in the higher frequency range.

Attenuation is restricted to the lower frequency range if you connect only one end of the shielding (that is, at the start or end of the cable) to ground. One-sided shielding connections could be more favorable in situations

• not allowing the installation of an equipotential bonding conductor,

• where analog signals (some mA or A) are transferred,

• or if foil shielding is used (static shielding).

Note Potential differences between two grounding points might cause an equipotential current

flow across shielding connected at both ends. In this case, you should install an additional equipotential bonding conductor.

Caution Always avoid the flow of operating current to ground.

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4.9 Electrical assembly, protective measures and grounding

Rule: Load circuit grounding

You should always ground the load circuits. This common reference potential (ground) ensures proper functioning.

Note (not valid for CPU 31xC): If you want to locate a fault to ground, provide your load power supply (terminal L or M) or

the isolating transformer with a removable connection to the protective conductor (see

Overview: Grounding

section 4).

Connecting the load voltage reference potential

A complex system containing many output modules requires an additional load voltage for switching the final control elements.

The table below shows how to connect the load voltage reference potential M various configurations.

Table 4-9 Connecting the load voltage reference potential

Installation common potential modules isolated modules Note

grounded Connect M

the CPU

ungrounded Connect M

the CPU

external

with M on

Connect or do not connect M

to the grounding

external

busbar Connect or do not connect

to the grounding

external

busbar

for the

external

Ungrounded installation with CPU 31xC is not possible

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4.9 Electrical assembly, protective measures and grounding

4.9.6 Overview: Grounding

CPU 31xC

The figure below shows you the complete assembly of an S7-300 with CPU 31xC with a power supply from TN-S mains. Apart from powering the CPU, the PS 307 also supplies the load current for the 24 VDC modules. Note: The layout of the power connections does not correspond with their physical arrangement; it was merely selected to give you a clear overview.

L1 L2

N PE

Low-voltage distribution e.g. TN-S system (3 x 400 V)

Cabinet

Profile rail

L+

Common grounding line in the cabinet

Load circuit 24 to 230 V AC for AC modules

Load circuit 5 to 60 V DC non-isolated DC modules

CPU

µP

Signal modules

Table 4-10 Connecting the load voltage reference potential

The figure illustrates the following

The main switch

(1)

The short-circuit / overload protection

(2)

The load current supply (galvanic isolation)

(3)

This connection is made automatically for the CPU 31xC

(4)

S7-300, CPU 31xC and CPU 31x: Installation

Load circuit 5 to 60 V DC for isolated DC modules

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4.9 Electrical assembly, protective measures and grounding

All CPUs except CPU 31xC

The figure below shows you the complete assembly of an S7-300 with TN-S mains supply (does not apply to CPU 31xC). Apart from powering the CPU, the PS 307 also supplies the load current for the 24 VDC modules.

Note: The layout of the power connections does not correspond with their physical arrangement; it was merely selected to give you a clear overview.

L1 L2

N PE

Low-voltage distribution e.g. TN-S system (3 x 400 V)

Cabinet

Profile rail

L+

Common grounding line in the cabinet

Load circuit 24 to 230 V AC for AC modules

Load circuit

5 to 60 V DC for non-isolated DC modules

CPU

µP

Signal modules

Table 4-11 Connecting the load voltage reference potential

The figure illustrates the following (1) The main switch (2) The short-circuit / overload protection (3) The load current supply (galvanic isolation) (4) The removable connection to the grounding conductor, for ground fault localization (5) The grounding slide contact of the CPU (not CPU 31xC)

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

Load circuit 5 to 60 V DC for isolated DC modules

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Configuring

4.10 Selecting the load power supply

Task of the load power supply

The load power supply feeds the input and output circuits (load circuits), and the sensors and actuators.

Features of load power supply units

You will have to adapt the load power supply unit to your specific application. The table below shows a comparison of the various load power supply units and their features to help you make your choice:

Table 4-12 Features of load power supply units

Necessary for ... Feature of the load power

Modules requiring voltage supplies ≤ 60 VDC or ≤ 25 VAC.

24 VDC load circuits

24 VDC load circuits 48 VDC load circuits 60 VDC load circuits

Load power supply requirements

Only an extra-low voltage of ≤ 60 VDC which is safely isolated from mains may be used as load voltage. Safe isolation from mains can be achieved, for example, in accordance with VDE 0100 Part 410 / HD 384-4-41 / IEC 364-4-41 (as functional extra-low voltage with safe isolation) or VDE 0805 / EN 60950 / IEC 950 (as safety extra-low voltage SELV) or VDE 0106 Part 101.

Load current determination

The required load current is determined by the accumulated load current of all sensors and actuators connected to the outputs.

Remarks

supply Safety isolation This is a common feature of the

Siemens power supply series PS 307 and SITOP power series 6EP1.

Output voltage tolerances:

20.4 V to 28.8 V

40.8 V to 57.6 V 51 V to 72 V

A short-circuit induces a surge current at the DC outputs which is 2 to 3 times higher than the rated output current, until the clocked electronic short-circuit protection comes into effect. Make allowances for this increased short-circuit current when selecting your load power supply unit. Uncontrolled load power supplies usually provide this excess current. With controlled load power supplies, and particularly for low output power up to 20 A, always ensure that the supply can handle this excess current.

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4.10 Selecting the load power supply

Example: S7-300 with load power supply from PS 307

The figure below shows the overall S7-300 configuration (load power supply unit and grounding concept), with TN-S mains supply. The PS 307 supplies the CPU and the load current circuit of the 24 VDC modules.

Note The layout of the power connections does not correspond with their physical arrangement; it

was merely selected to give you a clear overview.

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S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

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Configuring

4.11 Planning subnets

4.11.1 Overview

Subnets

Subnets available in SIMATIC for the various automation levels (process, cell, field and actuator/sensor level ):

• Multi-Point Interface (MPI)

• PROFIBUS

• PROFINET (Industrial Ethernet)

• Point-to-point communication (PtP)

• Actuator/Sensor Interface (ASI)

Multi Point Interface (MPI)

Availability: For all CPUs described in this document. MPI is a small area subnet containing a small number of nodes at the field/cell level. It is a

multipoint-capable interface in SIMATIC S7/M7 and C7, designed as PG interface, for networking a small number of CPUs, or for low volume data exchange with PGs.

MPI always retains the last configuration of the transmission rate, node number and highest MPI address, even after CPU memory reset, power failure or deletion of the CPU parameter configuration.

It is advisable to use the PROFIBUS DP network components for your MPI network configuration. The same configuration rules apply in this case. Exception: OWG modules are not allowed in the MPI network.

PROFIBUS

Availability: CPUs with the "DP" name suffix are equipped with a PROFIBUS interface (CPU 315-2 DP, for example).

PROFIBUS represents the network at the cell and field level in the SIMATIC open, multivendor communication system.

PROFIBUS is available in two versions:

1. PROFIBUS DP field bus for high-speed cyclic data exchange, and PROFIBUS-PA for intrinsically safe applications (requires DP/PA coupler).

2. The cell level as PROFIBUS (FDL or PROFIBUS FMS) for high-speed data exchange with communication partners at the same authorization level (can only be implemented via CP).

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4.11 Planning subnets

PROFINET (Industrial Ethernet)

Availability: CPUs with a "PN" name suffix are equipped a second interface, namely the PROFINET interface (CPU 317-2 PN/DP, for example) A PROFINET interface, or communication processors, can be used to implement Industrial Ethernet in an S7-300 CPU system.

Industrial Ethernet, in an open multivendor communication system, represents the SIMATIC network at the process and cell level. PROFINET CPUs, however, also support real-time communication at the field level. This structure also supports S7 communication. Industrial Ethernet is suitable for high-speed and high-volume data exchange, and for remote network operations via gateway.

PROFINET is available in two versions:

• PROFINET IO and

• PROFINET CBA.

PROFINET IO is a communications concept for the implementation of modular distributed applications. PROFINET IO allows you to create automation solutions you are familiar with from PROFIBUS.

PROFINET CBA Component-Based automation) is an automation concept for the implementation of applications with distributed intelligence. PROFINET CBA lets you create distributed automation solutions, based on default components and partial solutions. This concept satisfies demands for a higher degree of modularity in the field of mechanical and systems engineering by extensive distribution of intelligent processes.

Component-Based automation is designed for the integration of complete technological modules as standardized components into large systems.

PtP communication (PtP)

Availability: CPUs with "PtP" name suffix are equipped with a second interface, namely the PtP interface (CPU 314C-2 PtP, for example)

PtP does not represent a subnet in the common sense, because it is used to interconnect only two stations.

If a PtP interface is not available, you require PtP Communication Processors (CP).

Actuator/Sensor Interface (ASI)

Implementation by means of communication processors (CP). The ASI, or actuator/sensor interface, represents a subnet system on the lowest process

level for automation systems. It is designed especially for networking digital sensors and actuators. The maximum data volume is 4 bits per slave station.

S7-300 CPUs require communication processor for the ASI connection.

Reference

For further information on communication, refer to the manual.

Communication with SIMATIC

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4.11.2 Configuring MPI and PROFIBUS subnets

4.11.2.1 Overview

The next section contains all the information you require to configure MPI, PtP and PROFIBUS subnets:

Contents

• MPI, PtP and PROFIBUS subnets

• Multi-Point Interface

• PROFIBUS DP

• MPI and PROFIBUS network components

• Example of networks - MPI

4.11.2.2 Basic principles of MPI and PROFIBUS subnets

Convention: device = node

All devices you interconnect on the MPI or PROFIBUS network are referred to as nodes.

Segment

A segment is a bus line between two terminating resistors. A segment may contain up to 32 nodes. It is also limited with respect to the permitted line length, which is determined by the transmission rate.

Transmission rate

Maximum transmission rates:

• MPI:

– CPU 315-2 PN/DP and CPU 317: 12 Mbps – All other CPUs: 187.5 kbps

• PROFIBUS DP: 12 Mbps

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4.11 Planning subnets

Number of nodes

Maximum number of nodes per subnet:

Table 4-13 Subnet nodes

Parameters MPI PROFIBUS DP Number 127 126 1 Addresses 0 to 126 0 to 125 Note Default: 32 addresses

Reserved addresses:

• Address 0 for PG

• Address 1 for OP

Note the CPU-specific maximum specifications in the relevant CPU manual.

of those:

• 1 master (reserved)

• 1 PG connection (address 0 reserved)

• 124 slaves or other masters

MPI/PROFIBUS DP addresses

You need to assign an address to all nodes in order to enable intercommunication:

• On the MPI network: an MPI address

• On the PROFIBUS DP network: a PROFIBUS DP address

You can use the PG to set the MPI/PROFIBUS addresses for each one of the nodes (some of the PROFIBUS DP slaves are equipped with a selector switch for this purpose).

Default MPI/PROFIBUS DP addresses

The table below shows you the default setting of the MPI/PROFIBUS DP addresses, and the factory setting of the highest MPI/PROFIBUS DP addresses for the nodes.

Table 4-14 MPI/PROFIBUS DP addresses

Node (device) Default

MPI/PROFIBUS DP

address PG 0 32 126 OP 1 32 126 CPU 2 32 126

Default highest MPI address

Rules: Assignment of MPI /PROFIBUS DP addresses

Note the following rules before assigning MPI/PROFIBUS addresses:

• All MPI/PROFIBUS subnet addresses must be unique.

Default highest PROFIBUS DP address

• Highest MPI/PROFIBUS address ≥ physical MPI/PROFIBUS address, and must be identical for each node. (Exception: connecting a PG to multiple nodes; refer to the next chapter).

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BUSF DC5V FRCE RUN STOP

4.11 Planning subnets

Differences in the MPI addresses of CPs/FMs in an S7300 system

Table 4-15 MPI addresses of CPs/FMs in an S7-300 system

Options Example

Example: A system containing an S7-300 CPU and 2

CPs. You have two options of assigning MPI

addresses to CPs/FMs installed in a system:

1st option: The CPU accepts the MPI addresses you set for the CPs in STEP 7.

2nd option: The CPU automatically assigns MPI addresses to the CPs in its system, based on the following syntax: MPI addr. CPU; MPI addr.+1; MPI addr.+2.

(Default) Special feature: CPU 315-2 PN/DP and CPU

317

BUSF DC5V FRCE RUN STOP

CPU

CPU CP CP MPI addr. MPI

addr.+x

MPI addr. MPI

addr.+1

When the central rack of an S7-300 contains FM/CPs with their own MPI address, the CPU forms its own communication bus via the backplane bus for these FM/CPs and separates it from the other subnets.

The MPI address of those FM/CPs is thus no longer relevant for the nodes on other subnets. The MPI address of the CPU is used to communicate with these FMs/CPs.

MPI add.+y

MPI addr.+2

Recommended MPI address settings

Reserve MPI address "0" for a service PG, or "1" for a service OP, for temporary connections of these devices to the subnet. You should therefore assign different MPI addresses to PGs/OPs operating on the MPI subnet.

Recommended MPI address of the CPU for replacement or service operations: Reserve MPI address "2" for the CPU. This prevents duplication of MPI addresses after you

connect a CPU with default settings to the MPI subnet (for example, when replacing a CPU). That is, you should assign an MPI address > "2" to CPUs on the MPI subnet.

Recommended PROFIBUS address settings

Reserve PROFIBUS address "0" for a service PG that you can subsequently connect briefly to the PROFIBUS subnet as required. You should therefore assign unique PROFIBUS addresses to PGs integrated in the PROFIBUS subnet.

PROFIBUS DP: Electrical cables or fiber-optic cables?

Use fiber optic cables on a field bus with greater length, rather than copper conductors, in order to be independent on the transmission rate, and to exclude external interference.

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Equipotential bonding

For information on what to take into account with respect to equipotential bonding in your network configuration, refer to the corresponding chapter in the appendix.

Reference

For further information, refer to the Communication section in

Manual, Technical Data

CPU 31xC and CPU 31x

4.11.2.3 Multi-Point Interface (MPI)

Availability

All CPUs described in this manual are equipped with an MPI interface X1. A CPU equipped with an MPI/DP interface is configured and supplied as MPI. To use the DP

interface, set DP interface mode in STEP 7.

Properties

The MPI (Multi-Point Interface) represents the CPU interface for PG/OP connections, or for communication in an MPI subnet.

The typical (default) transmission rate for all CPUs is 187.5 kbps. You can also set 19.2 kbps for communication with an S7-200. The 315-2 PN/DP and 317 CPUs support transmission rates up to 12 Mbps.

The CPU automatically broadcasts its bus configuration via the MPI interface (the transmission rate, for example). A PG, for example, can thus receive the correct parameters and automatically connect to a MPI subnet.

Note You may only connect PGs to an MPI subnet which is in RUN.

Other stations (for example, OP, TP, ...) should not be connected to the MPI subnet while the system is in RUN. Otherwise, transferred data might be corrupted as a result of interference, or global data packages may be lost.

Devices capable of MPI communication

• PG/PC

• OP/TP

• S7-300 / S7-400 with MPI

• S7-200 (19.2 kbps only)

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4.11.2.4 PROFIBUS DP interface

Availability

CPUs with “DP“ name suffix are equipped at least with a DP X2 interface. The 315-2 PN/DP and 317 CPUs are equipped with an MPI/DP X1 interface. A CPU with

MPI/DP interface is supplied with default MPI configuration. You need to set DP mode in STEP 7 if you want to use the DP interface.

Operating modes for CPUs with two DP interfaces

Table 4-16 Operating modes for CPUs with two DP interfaces

MPI/DP interface (X1) PROFIBUS DP interface (X2)

• MPI

• DP master

• DP slave

simultaneous operation of the DP slave on both interfaces is excluded

• not configured

• DP master

• DP slave 1

Properties

The PROFIBUS DP interface is mainly used to connect distributed I/O. PROFIBUS DP allows you to create large subnets, for example.

The PROFIBUS DP interface can be set for operation in master or slave mode, and supports transmission rates up to 12 Mbps.

The CPU broadcasts its bus parameters (transmission rate, for example) via the PROFIBUS DP interface when master mode is set. A PG, for example, can thus receive the correct parameters and automatically connect to a PROFIBUS subnet. You can disable this bus parameter broadcast in you configuration.

Note (for DP interface in slave mode only) When you disable the Commissioning / Debug mode / Routing check box in the DP interface

properties dialog in STEP 7, all user-specific transmission rate settings will be ignored, and the transmission rate of the master is automatically set instead. This disables the routing function at this interface.

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Devices capable of PROFIBUS DP communication

• PG/PC

• OP/TP

• DP slaves

• DP master

• Actuators/Sensors

• S7-300/S7-400 with PROFIBUS DP interface

Reference

Further information on PROFIBUS: http://www.profibus.com

4.11.2.5 Network components of MPI/DP and cable lengths

MPI subnet segment

You can install cables with a length of up to 50 m in an MPI subnet segment. This length of 50 m is the distance between the first and the last node of the segment.

Table 4-17 Permissible cable length of a segment on the MPI subnet

Transmission rate S7-300 CPUs (common

19.2 kbps

187.5 kbps

1.5 Mbps 200 m

3.0 Mbps

6.0 Mbps

12.0 Mbps

Segment on the PROFIBUS subnet

The maximum cable length of a a segment on the PROFIBUS subnet is determined by the set transmission rate.

Table 4-18 Permissible cable length of a segment on the PROFIBUS subnet

Transmission rate Maximum cable length of a segment

9.6 kbps to 187.5 kbps 1000 m 500 kbps 400 m

1.5 Mbps 200 m 3 Mbps to 12 Mbps 100 m

CPU 317 potential MPI) without CPU 317

50 m 1000 m

100 m

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Longer cable lengths via RS 485 repeater

You need to install RS485 repeaters for segments requiring cable lengths longer than the allowed length. For further information, refer to the RS485 Repeater Product Information.

Stub cables

Make allowances for the maximum stub cable length when you connect bus nodes to a bus segment by means of stub cables, for example, a PG via standard PG cable.

For transmission rates up to 3 Mbps, you can use a PROFIBUS bus cable with bus connector as stub cable. For transmission rates higher than 3 Mbps, use the patch cord to connect the PG or PC. You can connect several PG patch cords to the the bus (for order numbers see table 4-20). Other types of stub cables are not permitted.

Length of stub cables

The table below shows the maximum permitted lengths of stub cables per segment:

Table 4-19 Lengths of stub cables per segment

PG patch cord

Transmission rate Max. length of stub

cables per segment

9.6 kbps to 93.75 kbps 96 m 32 32

187.5 kbps 75 m 32 25 500 kbps 30 m 20 10

1.5 Mbps 10 m 6 3 3 Mbps to 12 Mbps

To connect PGs or PCs when operating at rates higher than 3 Mbps, use patch cords with

Number of nodes with stub cable length of ...

1.5 m or 1.6 m 3 m

the order no. 6ES7 901-4BD00-0XA0. In your bus configuration, you can use multiple PG patch cords with this order number. Other types of stub cables are not permitted.

Table 4-20 PG patch cord

Type Order number PG patch cord 6ES7 901-4BD00-0XA0

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PROFIBUS cables

For PROFIBUS DP or MPI networking we offer you the following bus cables for diverse fields of application:

Table 4-21 Available bus cables

Bus cable Order number PROFIBUS cable 6XV1 830-0AH10 PROFIBUS cable, halogen-free 6XV1 830-0CH10 PROFIBUS underground cable 6XV1 830-3AH10 PROFIBUS trailing cable 6XV1 830-3BH10 PROFIBUS cable with PUR sheath for

environments subject to chemical and mechanical stress

PROFIBUS cable with PE sheath for the food and beverages industry

PROFIBUS cable for festooning 6XV1 830-3CH10

6XV1 830-0DH10

6XV1 830-0BH10

Properties of PROFIBUS cables

The PROFIBUS cable is a 2-wire, shielded twisted-pair cable with copper conductors. It is used for hardwired transmission in accordance with US Standard EIA RS485.

The table below lists the characteristics of these bus cables.

Table 4-22 Properties of PROFIBUS cables

Properties Values Wave impedance approx. 135 Ω to 160 Ω (f = 3 MHz to 20 MHz) Loop resistance ≤ 115 Ω/km Effective capacitance 30 nF/km Attenuation 0.9 dB/100 m (f = 200 kHz) Permitted conductor cross-sections 0.3 mm2 to 0.5 mm2 Permitted cable diameter 8 mm ± 0.5 mm

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Installation of bus cables

When you install PROFIBUS cables, you must not

• twist,

• stretch

• or compress them.

When wiring indoor bus cables, also maintain the following marginal conditions (d cable diameter):

Table 4-23 Marginal conditions for wiring interior bus cables

Characteristics Condition Bending radius (one-off) ≥ 80 mm (10 x dA) Bending radius (multiple times) ≥ 160 mm (20 x dA) Permitted temperature range during installation –5 °C to +50 °C Shelf and static operating temperature range –22 °F to +149 °F

Reference

For information on the use of fiber-optic cables for PROFIBUS, refer to the SIMATIC NET, PROFIBUS Networks Manual.

Bus connector RS 485

Table 4-24 Bus connector

Type Order number RS485 bus connector, up to 12 Mbps,

with 90° cable exit, without PG interface, with PG interface

Fast Connect RS485 bus connector, up to 12 Mbps, with 90° cable exit, with insulation displacement technology, without PG interface, with PG interface

RS485 bus connector up to 12 Mbps with 35° cable exit (not for CPU 31xC, 312, 314, and 315-2 DP without PG interface with PG interface

= outer

6ES7 972-0BA11-0XA0 6ES7 972-0BB11-0XA0

6ES7 972-0BA50-0XA0 6ES7 972-0BB50-0XA0

6ES7 972-0BA40-0XA0 6ES7 972-0BB40-0XA0

Fields of application

You need bus connectors to connect the PROFIBUS cable to an MPI or PROFIBUS-DP interface

You do not require a bus connector for:

• DP slaves with degree of protection IP 65 (ET 200X, for example)

• RS 485 repeater.

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4.11 Planning subnets

RS 485 repeater

Type Order number RS 485 repeater 6ES7 972-0AA00-0XA0

Purpose

RS485 repeaters are used to amplify data signals on bus lines and to couple bus segments. You require this RS 485 Repeater in the following situations:

• more than 32 network nodes

• when interconnecting a grounded with an ungrounded segment

• when exceeding the maximum line length in a segment

Longer cable lengths

If you want to implement cable lengths above those permitted in a segment, you must use RS485 repeaters. The maximum cable length possible between two RS 485 repeaters corresponds to the cable length of a segment. Please note that these maximum cable lengths only apply if there is no further node interconnected between the two RS 485 repeaters. You can connect up to nine RS 485 repeaters in series. Please note that you have to add the RS 485 repeater when you determine the number of nodes in your subnet, even if it is not assigned its own MPI/PROFIBUS address.

Reference

• Technical data about the RS 485 repeater can be found in the product information.

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Configuring

BUSF

DC5V

FRCE

RUN

STOP

4.11 Planning subnets

4.11.2.6 Cable lengths of MPI and PROFIBUS subnets

Example: Installation of an MPI subnet

The figure below shows you the block diagram of a MPI subnet.

S7-300

BUSF

DC5V

FRCE

RUN

STOP

CPU

S7-300

CPUPSCPU

S7-300

CPUPSCPU

S7-300

CPUPSCPU

OP 27

MPI-addr. 2

MPI-addr. 1

S7-300

CPUPSCPU

MPI-addr. 13

MPI-addr. 3 MPI-addr. 4

OP 27

S7-300

CPUPSCPU

MPI-addr. 5 MPI-addr. 6

OP 27

S7-300

CPUPSCPU

MPI-addr. 7

PROFIBUS

MPI-addr. 9MPI-addr. 8MPI-addr. 10MPI-addr. 11MPI-addr. 12

MPI-addr. 0

Key to numbers in the figure

(1) Terminating resistor enabled.

(2) S7-300 and OP 27 have subsequently been connected to the MPI subnet using their default

MPI address.

(3) CPU 31xC, 312, 314, 315-2 DP

You can also assign user-specific MPI addresses to the CPs/FMs at these CPUs.

CPU 317-2 DP

CPs and FMs do not have their own MPI address in this CPU.

(4) In addition to the MPI address, the CP also has a PROFIBUS address (7 in this case).

(5) Connected via a stub cable using the default MPI address for commissioning/maintenance

only

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4.11 Planning subnets

Example: Maximum distances in the MPI subnet

The figure below shows you:

• a possible MPI subnet configuration

• maximum distances possible in an MPI subnet

• the principle of "Line extension" using RS 485 repeaters

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Example: Terminating resistor in the MPI subnet

The figure below shows you an example of an MPI subnet and where to enable the terminating resistor.

The figure below illustrates where the terminating resistors must be enabled in an MPI subnet. In this example, the programming device is connected via a stub cable only for the duration of commissioning or maintenance.

S7-300

CPU

ET 200 M

CPU

S7-300

CPU

ET 200 M

CPU

OP 27

S7-300

CPU

ET 200 M

CPU

RS 485Repeater

S7-300

CPU

ET 200 M

CPU

OP 27

Key to numbers in the figure (1) Terminating resistor enabled. (2) PG connected by means of a stub cable for maintenance purposes

Warning Disturbance of data traffic might occur on the bus. A bus segment must always be

terminated at both ends with the terminating resistor. This, for example, is not the case if the last slave with bus connector is off power. The bus connector draws its power from the station, and the terminating resistor is thus disabled. Please make sure that power is always supplied to stations on which the terminating resistor is active. Alternatively, you can also use the PROFIBUS terminator as active bus termination.

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4.11 Planning subnets

Example: Installation of a PROFIBUS subnet

The figure below shows you the basic principles of a PROFIBUS subnet installation.

S7-300

MPI-addr. 3

MPI-addr. 0

CPU

31x-2 DP

CPU

MASTER

PROFIBUS addr. 2

CPU

ET 200M

CPU

ET 200M

CPU

ET 200M

PROFIBUS addr. 3

PROFIBUS addr. 4

CPU

ET 200B ET 200B

S7-300

CPU

ET 200 M

DP-CPU

PROFIBUS addr. 5

CPU

ET 200B

CPU

ET 200M

PROFIBUS addr. 6

S5-95U

CPU

ET 200B

PROFIBUS addr. 7

PROFIBUS

addr. 12

PROFIBUS addr. 11

PROFIBUS addr. 10

PROFIBUS addr. 9

PROFIBUS addr. 8

Key to numbers in the figure

(1) Terminating resistor enabled.

(2) PG connected by means of a stub cable for maintenance purposes

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Example: CPU 314C-2 DP as MPI and PROFIBUSnode

The figure below shows you an assembly with a CPU 314C-2 DP integrated in an MPI subnet and also operated as DP master in a PROFIBUS subnet.

MPI address 0

S7-300

CPU

S5-95U

DP address 7

S7-300

MPI address 2

CPU

MPI address 3

CPU

MPI address 4

OP 27

MPI address 5

S7-300 CPU

with DP interface

as DP master

CPU

DP-CPU

DP address 2

ET200M

DP address 3

ET200M

DP address 4

S5-95U

DP address 6

S5-95U

DP address 5

RS 485 repeater

S7-300

CPU

MPI address 8

MPI address 6

OP 27

MPI address 7

ET200M

DP address 9

ET200M

DP address 8

ET200B

DP address 10 DP address 11

PROFIBUS subnetMPI subnet

Key to numbers in the figure (1) Terminating resistor enabled. (2) PG connected via a stub cable for maintenance or commissioning purposes

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4.11 Planning subnets

4.11.3 Configuring PROFINET subnets

4.11.3.1 Overview

The next section contains all the information you require to configure PROFINET subnets:

Contents

• PROFINET nodes

• Integration of field bus system into PROFINET

• PROFINET IO and PROFINET CBA (Component-Based Automation)

• PROFINET cable lengths

• Ethernet bus cable and connector

• Example of a PROFINET subnet

• Example of a PROFINET IO system

4.11.3.2 PROFINET nodes

Definition: Nodes in the PROFINET environment

Within the context of PROFINET, "node" is the generic term for:

• Automation systems

• Field devices (for example, PLC, PC, hydraulic devices, pneumatic devices)

• Active network components (for example, distributed I/O, valve blocks, drives)

The main characteristics of a node is its integration into PROFINET communication by means of Ethernet or PROFIBUS.

The following device types are distinguished based on their attachment to the bus:

• PROFINET nodes

• PROFIBUS nodes

Definition: PROFINET nodes

A PROFINET node always has at least one Industrial Ethernet port. A PROFINET node can also have a PROFIBUS port, that is, as master with proxy functionality. In exceptional circumstances, a PROFINET node can also have more than one PROFIBUS port (for example the CP 5614).

Definition: PROFIBUS nodes

A PROFIBUS node has at least one or more ports. A PROFIBUS node cannot take part directly in PROFINET communication, but must be

implemented by means of PROFIBUS master with PROFINET port or Industrial Ethernet/PROFIBUS link (IE/PB Link) with proxy functionality.

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Comparison of the terminology in PROFIBUS DP and PROFINET IO

The following schematic shows you the general names of the most important devices in PROFINET IO and PROFIBUS DP. The table below shows the designation of the various components in the PROFINET IO and PROFIBUS DP context.

Figure 4-1 PROFINET and PROFIBUS nodes

Number PROFINET PROFIBUS Comment 1 IO system DP master

system

2 IO controller DP master Node used to address the connected IO

3 IO supervisor PG/PC

Class 2 DP

master 4 Industrial Ethernet PROFIBUS Network infrastructure 5 HMI (Human

Machine Interface)

6 IO device DP slave Distributed field device assigned to one of the IO

HMI Device for operating and monitoring functions.

devices/DP slaves. That is: the IO controller/DP master exchanges

input and output signals with field devices. The IO controller/DP master is often the controller

on which the automation program runs. PG/PC HMI device for commissioning and

diagnostics

controllers/DP masters (for example, remote I/O, valve terminal, frequency converter, switches)

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Slots and Submodules

A PROFINET node can have a modular structure similar to a DP slave. A PROFINET node consists of slots in which the modules/submodules are inserted. The modules/submodules have channels over which the process signals are read in or output.

The following graphic illustrates the situation.

10 11 11 11

Figure 4-2 Module, Submodule, Slot, and Channel

Number Description 10 Interface module 11 Slot with module/submodule 12 Channel

It is always possible for a slot to be divided into subslots that contain submodules.

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4.11.3.3 Integration of field bus systems in PROFINET

Field bus Integration

PROFINET allows you to integrate existing field bus systems (for example, PROFIBUS, ASI, etc.) into PROFINET via proxy. This allows you to set up mixed systems consisting of field bus and Ethernet based subsystems. This makes a continuous technological transition to PROFINET possible.

Interconnection of PROFINET and PROFIBUS

You can connect PROFIBUS devices to the local PROFIBUS interface of a PROFINET device. This allows you to integrate existing PROFIBUS configurations in PROFINET.

The following figure shows the supported network types for PROFINET:

• Industrial Ethernet and

• PROFIBUS.

Industrial Ethernet

PROFIBUS

Figure 4-3 PROFINET Devices, PROFIBUS Devices, and Proxy

Number Description 1 PROFINET devices 2 PROFINET device with proxy functionality (for more detailed information, see below) 3 PROFIBUS devices

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PROFINET device with proxy functionality = Substitute

The PROFINET device with proxy functionality is the substitute for a PROFIBUS device on Ethernet. The proxy functionality allows a PROFIBUS device to communicate not only with its master but also with all nodes on PROFINET.

You can integrate existing PROFIBUS systems in PROFINET communication, for example with the help of an IE/PB Link or a CPU 31x-2 PN/DP. The IE/PB Link then handles communication over PROFINET as a substitute for the PROFIBUS components.

Currently, you can include DPV0 slaves in PROFINET in this way.

Further Information

For information on the differences and common features of PROFINET IO and PROFIBUS DP and for information on migrating from PROFIBUS DP to PROFIBUS I/O, refer to the

From PROFIBUS DP to PROFINET IO

programming manual.

4.11.3.4 PROFINET IO and PROFINET CBA

What is PROFINET IO?

Within the framework of PROFINET, PROFINET IO is a communication concept for the implementation of modular, distributed applications.

PROFINET IO allows you to create automation solutions familiar from PROFIBUS. PROFINET IO is implemented by the PROFINET standard for the programmable controllers

on the one hand, and on the other hand by the engineering tool STEP 7. This means that you have the same application view in STEP 7 regardless of whether you

configure PROFINET devices or PROFIBUS devices. Programming your user program is essentially the same for PROFINET IO and PROFIBUS DP if you use the expanded blocks and system status lists for PROFINET IO.

Reference

For more detailed information on new and modified blocks, refer to the

to PROFINET IO

programming manual.

User Programs in PROFINET IO and PROFIBUS DP

A comparison of the most important differences and common features in PROFINET IO and PROFIBUS DP that are relevant for the creation of user programs can be found in the programming manual

From PROFIBUS DP to PROFINET IO.

From PROFIBUS DP

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What is PROFINET CBA? (Component based Automation)?

Within the framework of PROFINET, PROFINET CBA is an automation concept for the implementation of applications with distributed intelligence.

PROFINET CBA lets you create distributed automation solutions, based on default components and partial solutions. This concept satisfies demands for a higher degree of modularity in the field of mechanical and systems engineering by extensive distribution of intelligent processes.

Component based Automation allows you to use complete technological modules as standardized components in large systems.

PROFINET CBA is implemented by:

• the PROFINET standard for programmable controllers and

• the SIMATIC iMAP engineering tool.

The components are also created in an engineering tool that can differ from vendor to vendor. Components of SIMATIC devices are generated, for example, with STEP 7.

The following figures illustrate how automation solutions are being transformed as a result of PROFINET CBA.

Conventional Automation Solutions without PROFINET CBA

Program is running on a central PLC

Industrial Ethernet

PROFIBUS

Distributed I/O

Engineering Human-Machine Interface

Mechanical

Electrical/Electronic

Figure 4-4 Existing automation concept with modular plant engineering

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4.11 Planning subnets

Automation Solution with PROFINET CBA

Engineering Human-Machine Interface

Industrial Ethernet

IE/PB-Link

PROFIBUS

Intelligent Field devices

Figure 4-5 New: Modular Concept with Distributed Intelligence

Mechanical + Electrical/Elektronic + User program

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Extent of PROFINET IO and PROFINET CBA

PROFINET IO and CBA are two different views of programmable controllers on Industrial Ethernet.

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Component based Automation divides the entire plant into various functions. These functions are configured and programmed.

PROFINET IO provides you with a picture of the plant that is very similar to the view obtained in PROFIBUS. You continue to configure and program the individual programmable controllers.

Controllers in PROFINET IO and PROFINET CBA

You can also use some PROFINET IO controllers for PROFINET CBA. The following list illustrates which PROFINET devices can adopt the function of a

PROFINET CBA or IO controller:

• Programmable controllers such as the S7-300 CPU 317-2 PN/DP

• CP 343-1 or CP 443-1 Advanced

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The following list illustrates which PROFINET devices can only adopt the function of a PROFINET IO controller:

• PCs attached to PROFINET with a CP (for example CP 1616) and SOFTNET PROFINET (for example CP 1612). With the CP 1616, the user program executes on the CP, with SOFTNET PROFINET, it executes in the CPU of the PC.

• SIMOTION device for particularly strict real-time requirements.

PROFINET devices can only adopt the function of a PROFINET CBA controller, for example PCs with a standard Ethernet interface and the WinLC software.

Proxy in PROFINET IO and PROFINET CBA

Proxies for PROFINET IO and proxies for PROFINET CBA are different. In PROFINET IO, the proxy for PROFINET IO represents each connected PROFIBUS DP

slave as a PROFINET IO device on PROFINET. In PROFINET CBA, the proxy for PROFINET CBA represents each connected PROFIBUS

DP slave as a component on PROFINET. As a result, there are, for example, different IE/PB Links for PROFINET IO and PROFINET

CBA. Currently, you can only use a CPU 317-2 DP/PN as a proxy for PROFINET CBA.

Integrating Components and Devices

In Component based Automation, you integrate the components in an interconnection editor (for example SIMATIC iMap). The components are described in a PCD file.

In PROFINET IO, you integrate the devices in an engineering system (for example STEP 7). The components are described in a GSD file.

Connecting PROFIBUS Devices via an IE/PB Link

Remember that there is a separate proxy functionality for PROFINET I/O and PROFINET CBA. With the IE/PB Link, this means that you must use different devices depending on the system you are using.

Interaction of PROFINET CBA and PROFINET IO

PROFINET IO integrates field devices (IO devices) in PROFINET. The input and output data of the IO devices is processed in the user program. The IO devices with their IO controller themselves can, in turn, be part of a component in a distributed automation structure.

You configure communication between, for example, a CPU as IO controller and the IO devices assigned to it as PROFINET IO in much the same way as a PROFIBUS DP master system in STEP 7. You also create your user program in STEP 7. From this, you generate a component in STEP 7.

You then configure communication between the components conveniently in SIMATIC iMAP.

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Note Update Times for Cyclic Data Exchange

STEP 7 automatically calculates a time within which each PROFINET IO device completes exchange of its user data with the corresponding IO controller: the update time.

Based on the existing hardware configuration and the resulting cyclic data traffic, STEP 7 automatically calculates an update time that you can extend manually.

If other cyclic services (for example PROFINET CBA) need to be taken into account in addition to PROFINET IO: Set a percentage in STEP 7/HW Config that will be reserved for PROFINET IO.

For more detailed information, refer to the STEP 7 online help.

Details on the Possible Uses of the Individual Products

For more information, refer to the documentation of the particular product.

4.11.3.5 PROFINET cable lengths and network expansion

Network expansion options are based on various factors (hardware design used, signal propagation delay, minimum distance between data packets, etc.)

Prefabricated twisted-pair cord cables

Twisted-pair cables can be used in environments with low EMC loads and with transmission lines up to 10 m. They employ the TP cord that is designed significantly thinner and more flexible by using reduced shielding compared to industrial twisted-pair cables. The connectors used in connecting industrial twisted-pair components are standardized RJ45 connectors and sub-D connectors.

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Product range for the RJ45 connection

The following prefabricated twisted-pair cables are available:

Table 4-25 Data for twisted-pair patch cables

Cable designation Application Available

lengths

TP Cord RJ45/RJ45 TP connecting cable with two RJ45

connectors.

TP XP cord RJ45/RJ45 Crossed TP cable with two RJ45

connectors.

TP cord 9/RJ45 TP cable with a 9-pin Sub-D connector

and an RJ45 connector.

TP XP cord 9/RJ45 Cross-over TP patch cable with 9-pin

sub-D connector and RJ45 connector.

TP patch cable 9-45/RJ45

TP XP patch cable 9-45/RJ45

TP XP patch cable 9/9 Cross-over TP patch cable for direct

TP patch cable RJ45/15

TP XP patch cable RJ45/15

TP patch cable with RJ45 connector and sub-D connector, with 45° cable exit (for OSM/ESM only)

Cross-over TP patch cable with RJ45 connector and sub-D connector with 45° cable exit (for OSM/ESM only)

connection of two industrial Ethernet network components with ITP interface, with two 9-pin sub-D connectors

TP patch cable with 15-pin sub-D connector and RJ45 connector.

Cross-over TP patch cable with 15-pin sub-D connector and RJ45 connector

0.5 m

1.0 m

2.0 m

6.0 m

10.0 m

0.5 m

1.0 m

2.0 m

6.0 m

10.0 m

0.5 m

1.0 m

2.0 m

6.0 m

10.0 m

0.5 m

1.0 m

2.0 m

6.0 m

10.0 m

1.0 m 6XV1 850-2NH10

1.0 m 6XV1 850-2PH10

1.0 m 6XV1 850-2RH10

0.5 m

1.0 m

2.0 m

6.0 m

10.0 m

0.5 m

1.0 m

2.0 m

6.0 m

10.0 m

Order number

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Reference

For detailed information on network configuration, refer to the Internet: SIMATIC NET: Twisted Pair and Fiber-Optic Networks (6GK1970-1BA10-0AA0) at http://www.siemens.com/automation/service&support.

4.11.3.6 Connectors and other components for Ethernet

The selection of the bus cable, bus connector and other components for Ethernet (for example, switches, etc.) depends on the intended application.

We offer a range of products covering a variety of applications for the installation of an Ethernet connection.

Reference

•

SIMATIC NET: Twisted-Pair and Fiber-Optic Networks

(6GK1970-1BA10-0AA0)

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4.11.3.7 Example of a PROFINET Subnet

Example: Installation of a PROFINET subnet

The graphic illustrates the combination of corporate level and process control level via industrial Ethernet. PCs in a classical office environment can be used to acquire data of the process automation system.

Subnet 1Subnet 1 Subnet 2Subnet 2

Company network

INDUSTRIAL ETHERNET

Switch 1

Router

CPU

31x-2 PN/DP

Figure 4-7 Example of a PROFINET Subnet

Switch 2

CPU

31x-2 PN/DP

Switch 3

31x-2 PN/DP

(DP SLAVE)

CPU

(DP master)

PROFIBUS

ET200

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Configuring

4.11 Planning subnets

Installation guidelines

PROFINET allows you to set up a high-performance and continuous communication system. You can further increase performance by using the following installation guidelines.

• Interconnect a router between the office network and the PROFINET system. Use the router to define access privileges for your PROFINET system.

• Set up your PROFINET in a star architecture where this is useful (for example: in a switch cabinet).

• Keep the number of switches low. This increases clarity of your PROFINET system architecture.

• Connect your programming device (PG) close to the communication partner (for example: connect the PG and the communication partner to the same switch).

• Modules with PROFINET interfaces may only be operated in LANs where all nodes are equipped with SELV/PELV power supplies or protection systems of equal quality.

• A data transfer device that ensures this safety must be specified for the coupling to the WAN.

Reference

For detailed information on Industrial Ethernet networks or network components, refer to:

• the Internet URL http://www.siemens.com/automation/service&support.

• The STEP 7 Online Help. There you can also find further information on IP address

assignment.

• The Communication with SIMATIC (EWA 4NEB 710 6075-01) manual

• The SIMATIC NET manual: Twisted-Pair and Fiber Optic Networks

(6GK1970-1BA10-0AA0)

S7-300, CPU 31xC and CPU 31x: Installation

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Configuring

4.11 Planning subnets

4.11.3.8 Example of a PROFINET IO system

Extended Functions of PROFINET IO

The figure below shows you the new functions of PROFINET IO

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The figure shows The figure shows the communication path The interconnection of the

company network with field level

The interconnection between the automation system and field level

The IO controller of the CPU 31x-2 PN/DP (1) controls the nodes connected to the Industrial Ethernet and PROFIBUS directly

A CPU can be both IO controller and DP master

From PCs in your company network, you can access devices at the field level Example:

• PC — Switch 1 — Router — Switch 2 — CPU 31x-2 PN/DP (1). You can, of course, also access other areas in Industrial Ethernet from a field PG. Example:

• PG — Switch 3 — Switch 2 — to an IO device of ET 200S (2). At this point, you see the enhanced IO feature between the IO controller and IO device(s)

on Industrial Ethernet:

• The CPU 31x-2 PN/DP (1) is the IO controller for one of the ET 200S (2) IO devices.

• The CPU 31x-2 PN/DP (1) is also the IO controller for the ET 200 (DP slave) (5) via

the IE/PB Link (6).

Here, you can see that a CPU can be both IO controller for an IO device as well as DP master for a DP slave:

• The CPU 31x-2 PN/DP (3) is the IO controller for the other ET 200S (2) IO device. CPU 31x-2 PN/DP (3) — Switch 3 — Switch 2 — ET 200S (2)

• The CPU 31x-2 PN/DP (3) is the DP master for a DP slave (4). The DP slave (4) is assigned locally to the CPU (3) and is not visible on the Industrial Ethernet.

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

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Configuring

4.11 Planning subnets

Requirements

• CPUs as of Firmware 2.3.0 (for example CPU 315-2 PN/DP)

• STEP 7, as of Version 5.3 + Service Pack 1

Reference

For information on PROFINET, refer to:

• the

• in the programming manual

System Description PROFINET

From PROFIBUS DP to PROFINET.

provides a comprehensive overview of the new PROFINET blocks and system status lists.

4.11.4 Routed network transitions

Example: PG access to remote networks (routing)

A CPU with several interfaces can also serve as a router for intercommunication with different subnets. With a PG you can access all modules on local and remote networks.

Requirements:

• STEP 7 Version 5.0 or higher. Note: For STEP 7 requirements with respect to the CPUs used, refer to the technical specifications.

• Assign the PG/PC to a network in your STEP 7 project (SIMATIC Manager, assigning a PG/PC).

• The various networks are interconnected using modules with routing functions.

This manual also

• After you configured all networks in NETPRO, initiated a new compilation for all stations, and then download the configuration to all modules with routing function. This also applies to all changes made in the network.

All routers therefore know all paths to a destination station.

S7-300, CPU 31xC and CPU 31x: Installation

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Configuring

4.11 Planning subnets

Access to remote networks

PG/PC 3

S7-400

CPU

CPU 416

S7-400

CPU 417

CPU

MPI (2)

MPI (1)

S7-300

CPU

31x-2 DP

S7-300

CPU

PG/PC 1

PROFIBUS DP

ET200

CPU

PG/PC 2

Figure 4-8 Access to remote networks

Example 1 To access the CPU 31x-2 DP using PG/PC 1: PG/PC 1 - MPI network (1) - CPU 417 as router - PROFIBUS network (3) - CPU 31x-2 DP Example 2 To access the the S7-300 CPU (on the right in the figure) using PG/PC 2: PG/PC 2 - PROFIBUS network (3)- CPU 31x-2 DP as router - MPI network (2) - S7-300 CPU Example 3 To access the 416 CPU using PG/PC 3: PG/PC 3 - MPI network (2) - CPU 31x-2 DP as router - PROFIBUS network (3)- CPU 417 as

router - MPI network (1) - CPU 416

Note Only for CPUs with DP interface: If these CPUs are operated as I-slaves and you want to use routing functionality, set the

Commissioning / Debug Mode / Routing check box in the DP Interface for DP Slave dialog box in STEP 7.

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Configuring

4.11 Planning subnets

Information on routing can be found ...

•

CPU Data Reference Manual

for your CPU

• In the

Communication with SIMATIC

4.11.5 Point-to-point (PtP)

Availability

CPUs with a “PtP“ name suffix are equipped with a PtP X2 interface.

Properties

Using the PtP interface of your CPU, you can connect external devices with serial interface. You can operate such a system at transmission rates up to 19.2 kbps in full duplex mode (RS 422), and up to 38.4 kbps in half duplex mode (RS 485).

Transmission rate

• Half duplex: 38.4 kbps

• Full duplex: 19.2 kbps

Driver

PtP communication drivers installed in those CPUs:

manual.

• ASCII drivers

• 3964(R) Protocol

• RK 512 (only CPU 314C-2 PtP)

Devices capable of PtP communication

Devices equipped with a serial port, for example, barcode readers, printers, etc.

Reference

CPU 31xC: Technological functions

manual

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Configuring

4.11 Planning subnets

4.11.6 Actuator/sensor interface (ASI)

Actuator/Sensor Interface (ASI)

Implementation using communication processors (CP). The ASI, or Actuator/Sensor Interface, represents a subnet system on the lowest process

level for automation systems. It is designed especially for networking digital sensors and actuators. The maximum data volume is 4 bits per slave station.

S7-300 CPUs require communication processor for the ASI connection.

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S7-300, CPU 31xC and CPU 31x: Installation

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Installing

5.1 Installing an S7-300

Here we will explain the steps required for the mechanical assembly of an S7-300.

Open components

Note Note the installation guidelines and notes on safety in this manual when mounting,

commissioning and operating S7-300 systems.

S7-300 modules are "Open Components" according to IEC 61131-2 and EC directive 73/23/EEC (Low-Voltage directive), and to UL/CSA Approval an "open type".

In order to conform with specifications on safe operation relating to mechanical strength, inflammability, stability and touch-protection, the following alternative installation modes are prescribed:

• Installation in a suitable cubicle

• Installation in a suitable cabinet

• Installation in an appropriately equipped and closed operating area

Access to these areas must only be possible with a key or tool. Only trained or authorized personnel is allowed access to these cubicles, cabinets or electrical operating rooms.

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

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Installing

5.1 Installing an S7-300

Accessories included

Installation accessories are included with the module package. The appendix contains a list of accessories and spare parts together with the corresponding order numbers.

Table 5-1 Module accessories

Module Accessories included Explanation

1 x Slot number label For assigning slot numbers CPU Inscription labels for the MPI address and Firmware

Version (all CPUs) for labeling of integrated inputs

and outputs (CPU 31xC only) Tip: Templates for labeling strips

are available on the Internet at http://www.ad.siemens.de/csinfo,

under article ID 11978022. Signal module (SM) Function Module (FM)

Communication module (CP)

Interface module (IM) 1 x Slot number label (only

1 Bus connector For electrical interconnection of

modules

1 Labeling strip For labeling module I/O

Tip: Templates for labeling strips

are available on the Internet at

http://www.ad.siemens.de/csinfo

under article ID 11978022.

1 Bus connector For electrical interconnection of

modules

1 Inscription label (only CP 342-2)

IM 361 and IM 365)

For labeling the AS interface

connector

Tip: Templates for labeling strips

are available on the Internet at

http://www.ad.siemens.de/csinfo

under article ID 11978022.

For assigning slot numbers on

racks 1 to 3

S7-300, CPU 31xC and CPU 31x: Installation

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Installing

5.2 Installing the mounting rail

Tools required and material

To install the S7-300, you require the tools and materials listed in the table below.

Table 5-2 Installation tools and materials

You require ... for ... cutting the 2 m rail to length commonly available tool scribing and drilling holes on the 2 m rail commonly available tool, 6.5 mm diameter drill bit screw-mounting the rail wrench or screwdriver, matching the selected

fixing screws diverse M6 screws (length depends on the place

of installation) with nuts and spring lock washers

screw-fastening the modules on the rail screwdriver with 3.5 mm blade width (cylindrical

design)

pulling out the grounding slide contact to achieve ungrounded state

screwdriver with 3.5 mm blade width (cylindrical design)

5.2 Installing the mounting rail

Mounting rail versions available

• Ready-to-use, four standard lengths (with 4 holes for fixing screws and 1 ground conductor bolt)

• One meter mounting rail May be shortened to any special length. Supplied without holes for fixing screws and without ground conductor bolt.

Requirements

Prepare the 2 m mounting rail for installation.

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Installing

5.2 Installing the mounting rail

Preparing the 2 m mounting rail for installation

1. Cut the 2 m mounting rail to the required length.

2. Mark out:

– four bores for the fixing screws (for dimensions, refer to "Dimensions for fixing holes") – one hole for the protective conductor bolt.

3. If the length of your rail exceeds 830 mm, you must stabilize it by providing additional holes for fixing it with more screws.

Mark out these holes along the groove in the middle section of the rail (see the Figure below). The pitch should be approx. 500 mm.

4. Drill the marked holes, bore diameter = 6.5

5. Mount an M6 bolt for fixing the ground conductor.

+0,2

mm for M6 screws.

Key to numbers in the figure (1) Hole for the ground conductor bolt (2) Groove for drilling additional holes for mounting screws (3) Hole for the mounting screw (4) Additional hole for mounting screw (5) Hole for the mounting screw

S7-300, CPU 31xC and CPU 31x: Installation

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Installing

5.2 Installing the mounting rail

Dimension of the mounting holes

The fixing hole dimensions for the mounting rail are shown in the table below..

Table 5-3 Mounting holes for rails

"Standard" rail 2 m mounting rail

32.5 mm

57.2 mm

Length of rail Dimension a Dimension b 160 mm 10 mm 140 mm

482.6 mm 8.3 mm 466 mm 530 mm 15 mm 500 mm 830 mm 15 mm 800 mm

Fixing screws

To fix the mounting rails you can use the following types of screws:

For ... you can use ... description outer fixing screws

additional fixing screws (only 2 m mounting rail)

32.5 mm

57.2 mm

approx. 500 mm

15 mm

–

cylindrical head screw M6 to ISO 1207/ISO 1580 (DIN 84/DIN 85)

M6 hexagonal head screw to ISO 4017 (DIN 4017)

cylindrical head screw M6 to ISO 1207/ISO 1580 (DIN 84/DIN 85)

approx. 500 mm

15 mm

Choose a suitable screw length for your assembly.

You also need size 6.4 washers to ISO 7092 (DIN 433)

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Installing

SIEMEN S

5.2 Installing the mounting rail

Installing the mounting rail

1. Install the mounting rails so that sufficient space is available for installing modules and to allow heat dissipation (clearance of at least 40 mm above and below the modules. See the figure below).

2. Mark up the mounting holes on the mounting surface. Drill the holes, diameter = 6.5

+0.2

mm.

3. Screw the rail (M6 screws) onto the mounting surface.

Note Always make sure of a low-impedance contact between the rail and a mounting surface,

if the latter is a grounded metal panel or equipment mounting panel. On varnished or anodized metals, for instance, use a suitable contacting agent or contact washers.

The figure below shows the clearance required for the installation of an S7-300.

40 mm

20 mm

40 mm

20 mm

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Installing

5.3 Mounting modules onto the rail

Requirements for module installation

• The configuration of the automation system is completed.

• The mounting rail is installed.

Mounting order of the modules

Hang the modules onto the rail, starting at the left and in the following order:

1. Power supply module

2. CPU

3. SMs, FMs, CPs, IMs

Note Please check before you insert any SM 331 analog input modules whether you have to

reposition the measuring range submodules at the side of the module. For further information, refer to chapter 4, "Analog Modules" in your

Module Data

Reference Manual.

Note When installing an S7-300 system with ungrounded reference potential, make the

relevant settings on the CPU. You ideally do so before you mount any modules onto the rail.

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5-7

Installing

5.3 Mounting modules onto the rail

Installation steps

The various steps in module installation are explained below.

1. Plug the bus connectors into the CPU and SMs / FMs / CPs / IMs. Except for the CPU, each module is supplied with a bus connector.

• Always start at the CPU when you plug in

the bus connectors. Remove the bus connector from the "last" module of the assembly.

• Plug the bus connectors into the other

modules. The "last" module does not receive a bus connector.

CPU

2. Add all modules to the rail in the specified order (1), slide them up to the module on the left (2), then swing them down (3).

3. Screw-tighten the modules.

CPU

5.4 Labeling the modules

Slot numbers Assignment

You should assign a slot number to each one of the mounted modules, thus making it easier to assign the modules in the configuration table in STEP 7. The table below shows the slot number assignment.

Table 5-4 Slot numbers for S7 modules

Slot number Module Comment 1 Power supply (PS) – 2 CPU – 3 Interface module (IM) to the right of the CPU 4 1. Signal module (SM) to the right of the CPU or IM 5 2. Signal module (SM) – 6 3. Signal module (SM) – 7 4. Signal module (SM) – 8 5. Signal module (SM) – 9 6. Signal module (SM) – 10 7. Signal module (SM) – 11 8. Signal module (SM) –

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Installing

5.4 Labeling the modules

Slot numbers Clipping the slot numbers onto the modules

1. Hold the corresponding slot number in front of the relevant module.

2. Insert the pin into the opening on the module (1).

3. Press the slot number into the module (2). The slot number breaks off from the wheel. The figure below illustrates this procedure. The slot number labels are included with the

CPU.

CPU

S7-300, CPU 31xC and CPU 31x: Installation

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Wiring

6.1 Requirements for wiring the S7-300

This chapter

Describes the requirements for wiring the PS, CPU and front connectors.

Accessories required

The following accessories are required for wiring the S7-300.

Table 6-1 Wiring accessories

Accessories Description Front connectors for connecting the sensors / actuators of the

Labeling strips for labeling the module I/Os Shielding contact element, shielding terminals

(matching the shielding diameter)

system to the S7-300

for connecting cable shielding

Tools and material required

Tools and materials required for wiring the S7-300.

Table 6-2 Tools and material for wiring

To ... you need ... Connect the protective conductor to the rail Wrench (size 10)

Adjust the power supply module to mains voltage Screwdriver with a blade width of 4.5 mm Wire the power supply module and the CPU Screwdriver with a 3.5-mm blade, side-cutters,

S7-300, CPU 31xC and CPU 31x: Installation Operating Instructions, Edition 08/2004, A5E00105492-05

Protective conductor cable (crosssection ≥ 10 mm

M6 nut, washer, spring lock washer

stripping tool Flexible cable, for example, sheathed flexible

cable 3 x 1.5 mm Wire end ferrules to DIN 46228

) with M6 cable lug

6-1

Wiring

6.1 Requirements for wiring the S7-300

To ... you need ... Wire the front connector Screwdriver with a 3.5-mm blade, side-cutters,

stripping tool Flexible cables, 0.25 mm

to 0.75/1.5 mm2 Shielded cables as required Wire end ferrules to DIN 46228

Wiring conditions for PS and CPU

Table 6-3 Wiring conditions for PS and CPU

Connectable cables to PS and CPU Solid conductors No Flexible conductors

• without wire end ferrule

• With wire end ferrule

Number of conductors per terminal 1 or 2, up to 1.5 mm2 (total) in a common wire

Diameter of the conductor insulation max. 3.8 mm Stripped length 11 mm Wire end ferrules to DIN 46228

• without insulating collar

• with insulating collar

0.25 mm

to 2.5 mm2

to 1.5 mm2

end ferrule

Design A, 10 mm to 12 mm length Design E, up to 12 mm length

Wiring conditions for front connectors

Table 6-4 Wiring conditions for front connectors

Connectable cables

Solid conductors No No Flexible conductors

• without wire end ferrule

• with wire end ferrule

Number of conductors per terminal

Diameter of the conductor insulation

Stripped length 6 mm 6 mm Wire end ferrules to DIN

46228

• without insulating collar

• with insulating collar

Front connectors 20-pole 40-pole

0.25 mm

to 1.5 mm2

0.25 mm

• Mains feed 1.5 mm

1 or 2, up to 1.5 mm2 (total) in a common wire end ferrule

max. 3.1 mm

1 or 2, up to 0.75 mm2 (total) in a common wire end ferrule

• max. 2.0 mm for 40-pole cables

• max. 3.1 mm for 20-pole cables

Design A, 5 mm to 7 mm length Design E, up to 6 mm length

to 0.75 mm2

S7-300, CPU 31xC and CPU 31x: Installation

6-2 Operating Instructions, Edition 08/2004, A5E00105492-05

Siemens Simatic S7-300 CPU 31xC, Simatic S7-300 CPU 312C, Simatic S7-300 CPU 314C-2 DP, Simatic S7-300 CPU 313C-2 DP, Simatic S7-300 CPU 314C-2 PtP Installation And Operating Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

Table of contents

Guide to the S7-300 documentation

Installation Order

S7-300 components

3.1 Example of an S7-300 configuration

3.2 Overview of the vital modules of an S7-300

Configuring

4.1 Overview

4.2 Basic engineering principles

4.3 Component dimensions

4.4 Required clearances

4.5 Arrangement of modules on a single rack

4.6 Distribution of modules to several racks

4.7 Selection and installation of cabinets

4.8 Example: Selecting a cabinet

4.9 Electrical assembly, protective measures and grounding

4.9.1 Grounding concept and overall structure

4.9.2 Installing an S7-300 with grounded reference potential

4.9.3 Configuring an S7-300 with ungrounded reference potential (not CPU 31xC)

4.9.4 Modules with isolated or common potential?

4.9.5 Grounding measures

4.9.6 Overview: Grounding

4.10 Selecting the load power supply

4.11 Planning subnets

4.11.1 Overview

4.11.2 Configuring MPI and PROFIBUS subnets

4.11.2.1 Overview

4.11.2.2 Basic principles of MPI and PROFIBUS subnets

4.11.2.3 Multi-Point Interface (MPI)

4.11.2.4 PROFIBUS DP interface

4.11.2.5 Network components of MPI/DP and cable lengths

4.11.2.6 Cable lengths of MPI and PROFIBUS subnets

4.11.3 Configuring PROFINET subnets

4.11.3.1 Overview

4.11.3.2 PROFINET nodes

4.11.3.3 Integration of field bus systems in PROFINET

4.11.3.4 PROFINET IO and PROFINET CBA

4.11.3.5 PROFINET cable lengths and network expansion

4.11.3.6 Connectors and other components for Ethernet

4.11.3.7 Example of a PROFINET Subnet

4.11.3.8 Example of a PROFINET IO system

4.11.4 Routed network transitions

4.11.5 Point-to-point (PtP)

4.11.6 Actuator/sensor interface (ASI)

Installing

5.1 Installing an S7-300

5.2 Installing the mounting rail

5.3 Mounting modules onto the rail

5.4 Labeling the modules

Wiring

6.1 Requirements for wiring the S7-300