Siemens Simatic S7-300 User manual

Contents
Preface 1
Guide to the S7-300
documentation 2
Installation order 3
S7-300 modules 4
Configuration 5
Installation 6
Wiring 7
Addressing 8
Commissioning 9
Maintenance 10
Testing functions, Diagnostics
and Fault Elimination 11
Appendix 12
Glossary 13
Index
SIMATIC
S7-300
Programmable Controller
Hardware and Installation
Manual
This manual is part of the documentation
package with order number:
6ES7398-8FA10-8BA0
Edition 09/2002
A5E00105492-02

Copyright © Siemens AG 2001-2002 All rights reserved
The 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
Bereich Automation and Drives
Geschaeftsgebiet Industrial Automation Systems
Postfach 4848, D- 90327 Nuernberg
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 this manual are reviewed regularly and any necessary
corrections included in subsequent editions. Suggestions for
improvement are welcomed.
©Siemens AG 2001-2002
Technical data subject to change.
Siemens Aktiengesellschaft A5E00105492-02
Safety Guidelines
This manual contains notices intended to ensure personal safety, as well as to protect the products and
connected equipment against damage. These notices are highlighted by the symbols shown below and
graded according to severity by the following texts:
!Danger
indicates that death, severe personal injury or substantial property damage will result if proper
precautions are not taken.
!Warning
indicates that death, severe personal injury or substantial property damage can result if proper
precautions are not taken.
!Caution
indicates that minor personal injury can result if proper precautions are not taken.
Caution
indicates that property damage can result if proper precautions are not taken.
Note
draws your attention to particularly important information on the product, handling the product, or to a
particular part of the documentation.
Qualified Personnel
Only qualified personnel should be allowed to install and work on this equipment. Qualified persons are
defined as persons who are authorized to commission, to ground and to tag circuits, equipment, and
systems in accordance with established safety practices and standards.
Correct Usage
Note the following:
!Warning
This device and its components may only be used for the applications described in the catalog or the
technical description, and only in connection with devices or components from other manufacturers
which have been 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
SIMATIC®, SIMATIC HMI® and SIMATIC NET® are registered trademarks of SIEMENS AG.
Third parties using for their own purposes any other names in this document which refer to trademarks might
infringe upon the rights of the trademark owners.

S7-300 Programmable Controller Hardware and Installation
A5E00105492-02 iii
Contents
1Preface.............................................................................................................................1-1
2 Guide to the S7-300 documentation.............................................................................2-1
3 Installation Order............................................................................................................3-1
4 S7-300 modules ..............................................................................................................4-1
5 Configuring .....................................................................................................................5-1
5.1 Summary of the Content...................................................................................5-1
5.2 Basic Principles of Planning..............................................................................5-2
5.3 Component dimensions ....................................................................................5-4
5.4 Arranging modules on a single rack..................................................................5-7
5.5 Arranging modules on multiple racks................................................................5-9
5.6 Selection and installation of cabinets..............................................................5-12
5.7 Example: Selecting a cabinet..........................................................................5-14
5.8 Electrical assembly, protective measures and grounding...............................5-16
5.8.1 Grounding concept and overall structure........................................................5-16
5.8.2 Installing an S7-300 with grounded reference potential..................................5-17
5.8.3 Installing an S7-300 with ungrounded reference potential
(not CPU 312 IFM or CPU 31xC)....................................................................5-20
5.8.4 Isolated or non-isolated modules?..................................................................5-23
5.8.5 Grounding........................................................................................................5-26
5.8.6 Overview: Grounding ......................................................................................5-28
5.9 Selecting the load power supply unit ..............................................................5-31
5.10 Planning subnets.............................................................................................5-34
5.10.1 Extending and networking subnets.................................................................5-34
5.10.2 Basic Principles of MPI, DP and PtP Subnets................................................5-35
5.10.3 Interfaces.........................................................................................................5-39
5.10.4 Network components ......................................................................................5-41
5.10.5 Cable length....................................................................................................5-45
5.10.6 Sample networks.............................................................................................5-46
6 Installation.......................................................................................................................6-1
6.1 Installing an S7-300 ..........................................................................................6-1
6.2 Installing the rail ................................................................................................6-3
6.3 Installing modules on the rail.............................................................................6-7
6.4 Label the modules.............................................................................................6-9
7 Wiring...............................................................................................................................7-1
7.1 Wiring................................................................................................................7-1
7.2 connecting the protective conductor to the rail .................................................7-4
7.3 Adjusting the power supply module to mains voltage.......................................7-5
7.4 Wiring the power supply module and the CPU.................................................7-6

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S7-300 Programmable Controller Hardware and Installation
iv A5E00105492-02
7.5 Wiring front connectors .....................................................................................7-8
7.6 Inserting front connectors into modules..........................................................7-11
7.7 Labeling the module I/Os ................................................................................7-12
7.8 Connecting shielded cables to the shielding contact element ........................7-13
7.9 Wiring the bus connector ................................................................................7-16
8 Addressing......................................................................................................................8-1
8.1 Addressing ........................................................................................................8-1
8.2 Slot-defined addressing of modules..................................................................8-1
8.3 Introduction........................................................................................................8-1
8.4 User-defined addressing of modules ................................................................8-3
8.5 Addressing signal modules ...............................................................................8-4
8.6 Addressing the integrated I/O of the CPU.........................................................8-8
8.7 Consistent data ...............................................................................................8-11
9 Commissioning...............................................................................................................9-1
9.1 In this Chapter...................................................................................................9-1
9.2 Commissioning procedure ................................................................................9-1
9.3 The commissioning checklist ............................................................................9-4
9.4 Insert the back-up battery or rechargeable battery...........................................9-6
9.5 Inserting or replacing a Memory Card or Micro Memory Card..........................9-7
9.6 Commissioning the modules...........................................................................9-10
9.6.1 Connecting the PG..........................................................................................9-10
9.6.2 Initial power on................................................................................................9-13
9.6.3 Resetting CPU memory ..................................................................................9-15
9.6.4 Starting SIMATIC Manager.............................................................................9-20
9.6.5 Monitoring and controlling I/Os .......................................................................9-21
9.7 Commissioning PROFIBUS DP......................................................................9-26
9.7.1 Commissioning the CPU as DP master..........................................................9-27
9.7.2 Commissioning the CPU as DP slave.............................................................9-30
9.7.3 Direct data exchange ......................................................................................9-36
10 Maintenance..................................................................................................................10-1
10.1 In this Chapter.................................................................................................10-1
10.2 Operating System back-up..............................................................................10-2
10.3 Updating the Operating System......................................................................10-3
10.4 Module replacement........................................................................................10-5
10.5 Replacing the back-up battery or rechargeable battery (CPUs with MC only)10-9
10.6 Digital output module AC 120/230 V: Replacing the fuses...........................10-12
11 Testing functions, Diagnostics and Fault Elimination..............................................11-1
11.1 In this Chapter.................................................................................................11-1
11.2 Overview: Testing functions............................................................................11-1
11.3 Overview: Diagnostics.....................................................................................11-4
11.4 Diagnostic options with STEP 7......................................................................11-6
11.5 Diagnostics with LEDs ....................................................................................11-7
11.6 Diagnostics of DP CPUs ...............................................................................11-12
11.6.1 Diagnostics of DP CPUs operating as DP master........................................11-12
11.6.2 Interrupts on the DP master..........................................................................11-22
12 Appendix .......................................................................................................................12-1
12.1 Assembly.........................................................................................................12-1
12.1.1 General rules and regulations for S7-300 operation.......................................12-1
12.2 Protection against electromagnetic interference.............................................12-3

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S7-300 Programmable Controller Hardware and Installation
A5E00105492-02 v
12.2.1 Basic points for system installations conforming with EMC requirements......12-3
12.2.2 Five basic rules for insuring EMC ...................................................................12-5
12.2.3 EMC compatible installation of PLC................................................................12-7
12.2.4 Examples of an EMC compatible installation..................................................12-9
12.2.5 Outdoor cable routing....................................................................................12-17
12.3 Lightning and surge voltage protection.........................................................12-18
12.3.1 In the following sections ...............................................................................12-18
12.3.2 Rules for the transition point between lightning protection zones 1..............12-21
12.3.3 Rules for the transition points between lightning protection zones
1 <-> 2 and higher.........................................................................................12-23
12.3.4 Sample of a surge protection circuit for networked S7-300 PLCs................12-26
12.3.5 1 How to protect digital output modules against inductive surge voltage.....12-28
12.4 Safety of electronic control equipment..........................................................12-30
13 Glossary ........................................................................................................................13-1
Index

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S7-300 Programmable Controller Hardware and Installation
vi A5E00105492-02
Figures
1-1 Documentation S7-300 .....................................................................................1-2
1-2 Additional Documentation.................................................................................1-3
1-3 SIMATIC Technical Support..............................................................................1-4
3-1 Installing an S7 system .....................................................................................3-1
4-1 Modules in an S7-300 .......................................................................................4-1
5-1 Horizontal and vertical installation.....................................................................5-3
5-2 Shielding terminal module.................................................................................5-5
5-3 Clearance..........................................................................................................5-6
5-4 Rack with eight signal modules.........................................................................5-8
5-5 Full assembly using racks...............................................................................5-11
5-6 Power loss dissipated .....................................................................................5-15
5-7 S7-300 configuration with grounded reference potential
(CPU 313 – 318-2 DP)....................................................................................5-18
5-8 CPU with grounded reference potential (as supplied) ....................................5-19
5-9 S7-300 configuration with floating reference potential
(CPU 313 – 318-2 DP)....................................................................................5-21
5-10 Creating a floating reference potential on a CPU ...........................................5-22
5-11 Configuration with isolated modules ...............................................................5-24
5-12 Configuration with non-isolated modules........................................................5-25
5-13 Grounding concept for the S7-300 with CPU 31xC ........................................5-29
5-14 Grounding concept for the S7-300 (excluding CPU 31xC).............................5-30
5-15 Example: S7-300 with load power supply unit from PS 307...........................5-33
5-16 Example of an MPI subnet..............................................................................5-47
5-17 Example: Maximum distances in the MPI subnet...........................................5-48
5-18 Example of a PROFIBUS subnet....................................................................5-49
5-19 Example: CPU 314C-2 DP as MPI and PROFIBUS nodes............................5-50
5-20 Example of PG access across network boundaries (routing).........................5-51
5-21 Installing the terminating resistors in an MPI subnet ......................................5-52
6-1 Holes for mounting the 2 m rail.........................................................................6-4
6-2 Free space required for an S7-300 installation.................................................6-6
6-3 Inserting slot numbers in modules ..................................................................6-10
7-1 connecting the protective conductor to the rail .................................................7-4
7-2 Setting the mains voltage selector switch for the PS 307.................................7-5
7-3 Wiring the power supply module and the CPU.................................................7-7
7-4 Move the front connector into wiring position....................................................7-9
7-5 Slide the labelled strips into the front panel....................................................7-12
7-6 Shielding contact element underneath two signal modules............................7-14
7-7 Connecting 2-wire cables to the shielding contact element............................7-15
7-8 Bus connector: Enabled and disabled terminating resistor.............................7-17
8-1 S7-300 slots and the associated module start addresses ................................8-2
8-2 Addresses of the I/O of digital modules ............................................................8-5
8-3 I/O Addresses of a digital module in Slot 4.......................................................8-6
8-4 I/O addresses of an analog module in Slot 4....................................................8-7
9-1 Insert a back-up battery into CPUs 313/314.....................................................9-7
9-2 Insert the memory card into the CPU................................................................9-8
9-3 Insert the micro memory card into the CPU......................................................9-9
9-4 Connecting a PG to an S7-300.......................................................................9-10
9-5 Connecting a PG to multiple S7-300 PLCs.....................................................9-11
9-6 Connecting a PG to a subnet..........................................................................9-12
9-7 PG connected to an ungrounded S7-300 .......................................................9-13

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S7-300 Programmable Controller Hardware and Installation
A5E00105492-02 vii
9-8 Using the mode selector switch to reset the memory.....................................9-16
9-9 Using the mode selector switch for a cold start (CPU 318-2 DP only) ...........9-18
9-10 Intermediate memory in CPU 31x-2 DP/31xC-2 DP as DP slave...................9-33
9-11 Direct Data Exchange with CPUs 31x-2 DP/31xC-2 DP.................................9-37
10-1 Unlocking the front connector and removing the module ...............................10-6
10-2 Removing the front connector coding pin .......................................................10-7
10-3 Installing a new module...................................................................................10-7
10-4 Inserting the front connector ...........................................................................10-8
10-5 Replacing the back-up battery in CPU 313/314............................................10-10
10-6 Location of fuses in the digital output module 120/230 VAC........................10-13
11-1 Principle of Forcing with S7-300 CPUs (all CPUs except 318-2 DP) .............11-3
11-2 Diagnostics with CPU 31x-2..........................................................................11-12
11-3 Diagnostic addresses for DP masters and DP slaves ..................................11-13
11-4 Diagnostic address for the receiving station with direct data exchange.......11-16
11-5 Diagnostic addresses for DP masters and DP slaves ..................................11-20
11-6 Structure of slave diagnostic data.................................................................11-24
11-7 Structure of the ID-specific diagnostics for CPU 31x-2.................................11-27
11-8 Structure of the module status......................................................................11-28
11-9 Structure of the interrupt status.....................................................................11-29
11-10 Bytes y+4 to y+7 for a diagnostic interrupt
(operating status change by intelligent slave)...............................................11-30
11-11 Bytes y+4 to y+7 for the diagnostic interrupt (SFB 75).................................11-31
12-1 Possible paths of electromagnetic interference..............................................12-3
12-2 Example of an EMC compatible cabinet installation.......................................12-9
12-3 Example of EMC compatible wall-mounting .................................................12-11
12-4 Mounting cable shielding...............................................................................12-13
12-5 Equipotential bonding....................................................................................12-14
12-6 Lightning protection zones of a building........................................................12-20
12-7 Sample circuit for networked S7-300 PLCs..................................................12-26
12-8 EMERGENCY-OFF relay contact in the output circuit..................................12-28
12-9 Circuit for coils operated with DC voltage.....................................................12-29
12-10 Circuit for coils operated with AC voltage.....................................................12-29

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S7-300 Programmable Controller Hardware and Installation
viii A5E00105492-02
Tables
2-1 Influence of the ambient conditions on the automation system (AS)................2-1
2-2 Electrical isolation..............................................................................................2-1
2-3 Communication between sensors/actuators and the automation system ........2-2
2-4 Use of centralized and decentralized peripherals.............................................2-2
2-5 Configuration consisting of the central processing unit (CPU) and
expansion modules (EMs).................................................................................2-2
2-6 CPU performance .............................................................................................2-3
2-7 Communication .................................................................................................2-3
2-8 Software............................................................................................................2-3
2-9 Supplementary features....................................................................................2-4
4-1 Components of an S7-300:...............................................................................4-2
5-1 rails - overview ..................................................................................................5-4
5-2 Module width.....................................................................................................5-4
5-3 Shielding terminals - overview ..........................................................................5-6
5-4 Interface modules - Overview ...........................................................................5-9
5-5 Types of cabinet..............................................................................................5-13
5-6 Choice of cabinets...........................................................................................5-15
5-7 VDE specifications for the installation of a PLC system .................................5-17
5-8 Protective grounding measures ......................................................................5-26
5-9 Connection of the load voltage reference potential.........................................5-28
5-10 Characteristics of load power supply units......................................................5-31
5-11 Nodes on the subnet.......................................................................................5-37
5-12 MPI/PROFIBUS DP addresses.......................................................................5-37
5-13 MPI addresses of CPs/FMs in an S7-300.......................................................5-38
5-14 The following devices may be connected.......................................................5-41
5-15 Available bus cables .......................................................................................5-41
5-16 Marginal conditions for wiring interior bus cables...........................................5-42
5-17 Bus connector .................................................................................................5-43
5-18 RS 485 repeater..............................................................................................5-43
5-19 PG patch cord .................................................................................................5-44
5-20 Permitted cable lengths in an MPI subnet segment........................................5-45
5-21 Permitted cable lengths in a PROFIBUS subnet segment .............................5-45
5-22 Stub cable lengths per segment......................................................................5-46
6-1 Module accessories ..........................................................................................6-2
6-2 Installation tools and materials..........................................................................6-3
6-3 Mounting holes for rails.....................................................................................6-5
6-4 Slot numbers for S7 modules............................................................................6-9
7-1 Wiring accessories............................................................................................7-1
7-2 Conditions for connecting the PS and CPU......................................................7-2
7-3 Wiring conditions for front connectors...............................................................7-3
7-4 Assignment of front connectors to modules......................................................7-8
7-5 Wiring the front connector...............................................................................7-10
7-6 Assigning the labeling strips to modules.........................................................7-12
7-7 Assigning the shielding diameter to shielding terminals .................................7-13
8-1 Integrate inputs and outputs on the CPU 312 IFM............................................8-8
8-2 Integrate inputs and outputs on the CPU 314 IFM............................................8-8
8-3 Integrated inputs and outputs on the CPU 312C..............................................8-9
8-4 Integrated inputs and outputs on the CPU 313C..............................................8-9
8-5 Integrated inputs and outputs on the CPU 313C-2 PtP/DP............................8-10
8-6 Integrated inputs and outputs on the CPU 314C-2 PtP/DP............................8-10
9-1 Recommended commissioning procedure - part I: Hardware ..........................9-2

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S7-300 Programmable Controller Hardware and Installation
A5E00105492-02 ix
9-2 Recommended commissioning procedure - part II: software ...........................9-3
9-3 Possible causes for the CPU memory reset request......................................9-15
9-4 Procedure for resetting the CPU memory.......................................................9-16
9-5 Operations in the CPU during a memory reset...............................................9-19
9-6 Software requirements....................................................................................9-26
9-7 DP address areas of the CPUs.......................................................................9-26
9-8 Event recognition by CPUs 31x-2 DP/31xC-2 DP as the DP master .............9-29
9-9 Event recognition for CPUs 31x-2 DP/31xC-2 DP as the DP slave................9-32
9-10 Configuration example for the address areas in intermediate memory..........9-33
10-1 Backing up the operating system to MC or MMC ...........................................10-3
10-2 Updating the operating system with MC/MMC................................................10-4
11-1 The differences between forcing and controlling variables.............................11-3
11-2 Status and error displays ................................................................................11-7
11-3 Evaluation of the SF LED (software error)......................................................11-8
11-4 Evaluation of the SF LED (hardware error).....................................................11-9
11-5 The BUSF, BUSF1 and BUSF2 LEDs ..........................................................11-10
11-6 The BUSF LED lights up...............................................................................11-10
11-7 The BUSF LED flashes.................................................................................11-11
11-8 Event recognition by CPUs 31x-2 as the DP master....................................11-14
11-9 Evaluation in the DP master of RUN to STOP transitions
by the DP slave.............................................................................................11-15
11-10 Reading the diagnostic information using STEP 5 and STEP 7
in the masters system...................................................................................11-17
11-11 Event recognition by CPUs 31x-2 acting as the DP slave............................11-21
11-12 Evaluation of RUN to STOP transitions in the DP master/DP slave.............11-22
11-13 Structure of station status 1 (byte 0).............................................................11-25
11-14 Structure of station status 2 (byte 1).............................................................11-25
11-15 Structure of station status 3 (byte 2).............................................................11-26
11-16 Structure of the master PROFIBUS address (byte 3)...................................11-26
11-17 Structure of the vendor ID (byte 4, 5)............................................................11-26
12-1 Starting the system after specific events ........................................................12-1
12-2 Mains voltage..................................................................................................12-2
12-3 Protection against external electrical interference..........................................12-2
12-4 Protection against external electrical interference..........................................12-2
12-5 Coupling mechanisms.....................................................................................12-4
12-6 Key to example 1 ..........................................................................................12-10
12-7 Routing cables inside buildings.....................................................................12-15
12-8 High-voltage protection of cables with surge voltage
protection components..................................................................................12-21
12-9 Surge voltage protection components for lightning
protection zones 1 <-> 2 ...............................................................................12-24
12-10 Surge voltage protection components for lightning
protection zones 2 <-> 3 ...............................................................................12-25
12-11 Example of a lightning-protected structure (key to figure above) .................12-27

Contents
S7-300 Programmable Controller Hardware and Installation
xA5E00105492-02

S7-300 Programmable Controller Hardware and Installation
A5E00105492-02 1-1
Preface 1
Purpose of this manual
To get you started, this manual contains the information you will need to plan,
assemble, wire up, address and commission a S7-300.
You will then get to know the tools you can use to diagnose and eliminate errors in
hardware and software.
Basic knowledge required
To understand this manual you will require a general knowledge of automation
technology, backed up by a knowledge of the STEP 7 basic software. You may find
it useful to read the Programming with STEP 7 V5.1 manual first.
Scope of the Manual
This manual applies to S7-300 PLCs, assembled with one of the CPUs described
in the CPU Data Reference Manual.
Approvals
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
CE mark
The SIMATIC S7-300 product series conforms to the requirements and safety
specifications of following EU directives:
•EU directive 73/23/EWE "Low-voltage directive"
•EU directive 89/336/EEC "EMC directive“
C tick mark
The SIMATIC S7-300 product series is compliant with AS/NZS 2064 (Australia).

Preface
S7-300 Programmable Controller Hardware and Installation
1-2 A5E00105492-02
Standards
The SIMATIC S7-300 product series is compliant with the requirements and criteria
for IEC 61131-2.
Documentation required
This manual is part of the documentation package for the S7-300.
Reference Manual
Examples
“CPU Data CPU 312 IFM to 318-2 DP”
“CPU data CPU 31xC and CPU 31x”
Manual
“CPU 31xC: Technological Functions”
Description of the individual
technological functions:
- Positioning
- Counting
- Point-to-Point-Connection
- Control
The CD contains examples of the technological
functions.
Installation Manual
Automation System S7-300: “Installation”
Configuration, installation, wiring, network and
commissioning descriptions of a S7-300
Description of the operation, the functions and the
technical data of the CPU
Reference Manual
Automation Systems S7-300, M7-300:
“Module Data”
Functions descriptions and the technical data of the
signal modules, power supply modules and the
interface modules
Instruction List
“CPU 312 IFM to 318-2 DP”
“CPU 31xC and CPU 31x”
List of stored instructions of the CPUs and their
execution times.
List of executable blocks
(OBs/SFCs/SFBs) and and their execution times.
Getting Started
Getting Starteds take you through each commissioning
step up to a functioning application by running through
a concrete example.
You are reading this manual
“CPU 31xC: Positioning with Analog Output”
“CPU 31xC: Positioning with Digital Outputs”
“CPU 31xC: Count”
“CPU 31xC: Point-to-Point-Connection”
“CPU 31xC: Control”
“CPU 31xC: Commission”
“CPU 31x: Commission”
Figure 1-1 Documentation S7-300

Preface
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02 1-3
You also require the following manuals in addition to this documentation package:
Manual
“Integrated functions CPU 312 IFM/314 IFM”
Manual
Reference manual “system software for
S7-300/400 system and standard functions”
Reference manual Description of the SFCs, SFBs and OBs and CPUs.
You can also find the description in the STEP 7 Online
Help
Description of the technological functions of the
IFM.
CPUs
312 IFM/314
Figure 1-2 Additional Documentation
Recycling and Disposal
The CPU is recycleable due to its non-toxic materials. Please contact a company
certified in the disposal of electronic scrap for environmentally safe recycling and
disposal of your old device.
Further Support
If you have any technical questions, please get in touch with your Siemens
representative or agent responsible.
http://www.siemens.com/automation/partner
Training Centers
Siemens offers a number of training courses to familiarize you with the SIMATIC
S7 automation system. Please contact your regional training center or our central
training center in D 90327 Nuremberg, Germany for details:
Telephone: [phone].
Internet: http://www.sitrain.com

Preface
S7-300 Programmable Controller Hardware and Installation
1-4 A5E00105492-02
A&D Technical Support
Worldwide, available 24 hours a day:
Beijing
Nuernberg
Johnson City
Figure 1-3 A&D Technical Support
Worldwide (Nuernberg)
Technical Support
24 hours a day, 365 days a year
Phone: [phone]
Fax: [phone]
E-Mail: adsupport@
siemens.com
GMT: +1:00
Europe / Africa (Nuernberg)
Authorization
Local time: Mon.-Fri. 8:00 to 17:00
Phone: [phone]
Fax: [phone]
E-Mail: adsupport@
siemens.com
GMT: +1:00
United States (Johnson City)
Technical Support and
Authorization
Local time: Mon.-Fri. 8:00 to 17:00
Phone: [phone]
Fax: [phone]
E-Mail: isd-callcenter@
sea.siemens.com
GMT: -5:00
Asia / Australia (Beijing)
Technical Support and
Authorization
Local time: Mon.-Fri. 8:30 to 17:30
Phone: [phone]
Fax: [phone]
E-Mail: adsupport.asia@
siemens.com
GMT: +8:00
The languages of the SIMATIC Hotlines and the authorization hotline are generally German and English.

Preface
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02 1-5
Service & Support on the Internet
In addition to our documentation, we offer our Know-how online on the internet at:
http://www.siemens.com/automation/service&support
where you will find the following:
•The newsletter, which constantly provides you with up-to-date information on
your products.
•The right documents via our Search function in Service & Support.
•A forum, where users and experts from all over the world exchange their
experiences.
•Your local representative for Automation & Drives via our representatives
database.
•Information on field service, repairs, spare parts and more under "Services".

Preface
S7-300 Programmable Controller Hardware and Installation
1-6 A5E00105492-02

S7-300 Programmable Controller Hardware and Installation
A5E00105492-02 2-1
Guide to the S7-300 documentation 2
In this chapter
you will find a guide to the documentation for the S7-300.
Selecting and configuring
Table 2-1 Influence of the ambient conditions on the automation system (AS)
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What provisions do I have to make for PLC
installation space? Chapter Configuring; Mounting dimensions of modules, and Mounting; mounting the rail, in the
Installation Manual
How do environmental conditions influence the
PLC? Appendix of the Installation Manual
Table 2-2 Electrical isolation
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Which modules can I use if electrical isolation is
required between sensors/actuators? Chapter Configuring; Electrical assembly, protective measures and grounding, in the
Installation Manual
Reference Manual Module Data
When do I need to isolate the potential of individual
components?
How do I wire that?
Chapter Configuring; Electrical assembly,
protective measures and grounding, in the
Installation Manual
Chapter Wiring, in the Installation Manual
When do I need to isolate the potential of specific
stations?
How do I wire that?
Chapter Configuring; Configuring a subnet, in the
Installation Manual
Chapter Wiring, in the Installation Manual

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Table 2-3 Communication between sensors/actuators and the automation system
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Which module is suitable for my sensor/actuator? for CPU: CPU Data Reference Manual
for signal modules: Module Data Reference
Manual
How many sensors/actuators can I connect to the
module? for CPU: CPU Data Reference Manual
for signal modules: Module Data Reference
Manual
To connect my sensors/actuators to the PLC, how do
I wire the front connector ? Chapter Wiring; Wiring front connectors, in the Installation Manual
When do I require expansion modules (EM), and how
are they connected? Chapter Configuring, optional expansions and networking, in the Installation Manual
How do I mount modules in racks / on rails? Chapter Mounting; Mounting modules on a rail, in
the Installation Manual
Table 2-4 Use of centralized and decentralized peripherals
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Which range of modules do I want to use? for local I/Os / expansion modules (EMs): Module
Data Reference Manual
for distributed I/Os / PROFIBUS DP: Manual of
the relevant I/O device, e.g. Manual ET 200B
Table 2-5 Configuration consisting of the central processing unit (CPU) and expansion modules (EMs)
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Which rack / rail is best suited to my application? Chapter Configuring, in the Installation Manual
Which Interface modules (IM) do I need to connect
EMs to the CPU? Chapter Configuring, Arranging modules on multiple racks, in the Installation Manual
What is the right power supply (PS) for my
application? Chapter Configuring, in the Installation Manual

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Table 2-6 CPU performance
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Which memory concept is best suited to my
application? CPU Data Reference Manual
How do I insert and remove Micro Memory Cards? Chapter Commissioning; Removing/Installing Micro
Memory Cards, in the Installation Manual
Which CPU meets my requirements on
performance ? Instruction list; CPU Data Reference Manual
How fast is the response / processing time of the
CPU? CPU Data Reference Manual
Which technological functions are implemented? Technological functions Manual
How can I use these technological functions? Technological functions Manual
Table 2-7 Communication
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Which principles do I have to take into account? Communication with SIMATIC Manual
Which options and resources are available on the
CPU ? CPU Data Reference Manual
How do I optimize communication with the help of
communication processors (CPs)? the relevant manual
Which type of communication network is best
suited to my application? Chapter Configuring; Configuring a subnet, in the Installation Manual
Communication with SIMATIC Manual
How do I network the individual components? Chapter Configuring and wiring, in the Installation
Manual
Table 2-8 Software
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Which software do I require for my S7-300 system? Chapter Technical Data; CPU Data Reference
Manual

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Table 2-9 Supplementary features
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How do I implement operator control and
monitoring?
(Human Machine Interface)
for text-based display units: the relevant device
manual
for OPs: the relevant device manual
for WinCC: the relevant device manual
How can I integrate process control modules? for PCS 7: the relevant device manual
What options are offered by redundant and fail-safe
systems? Manual S7-400H - Redundant Systems; Manual Fail-safe Systems