Siemens Simatic S7-300 User manual

s
Contents
Preface 1
Guide to the S7-300
Documentation 2
Installation Order 3
S7-300 Modules 4
Configuring 5
Installation 6
Wiring 7
Addressing 8
Commissioning 9
Maintenance 10
Testing functions and
Diagnostics 11
Appendix 12
Glossary 13
Index
SIMATIC
S7-300 Automation System,
Hardware and Installation:
CPU 312IFM - 318-2 DP
Installation Manual
This manual is part of the documentation
package with the order number:
6ES7398-8FA10-8BA0
Edition 06/2003
A5E00203919-01

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.
Notice
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.
Copyright © Siemens AG 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
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.
Bereich Automation and Drives
Geschaeftsgebiet Industrial Automation Systems
Postfach 4848, D- 90327 Nuernberg
©Siemens AG 2003
Technical data subject to change.
Siemens Aktiengesellschaft A5E00203919-01

S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01 iii
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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 .........................................................................5-15
5.8 Electrical assembly, protective measures and grounding...............................5-17
5.8.1 Grounding concept and overall structure ........................................................5-17
5.8.2 Installing the S7-300 with grounded reference potential
(except for CPU 312 IFM) ...............................................................................5-19
5.8.3 Isolated or non-isolated modules ....................................................................5-22
5.8.4 Grounding measures.......................................................................................5-25
5.8.5 Overview: Grounding.......................................................................................5-28
5.9 Selecting the Load Power Supply ...................................................................5-30
5.10 Planning Subnets ............................................................................................5-32
5.10.1 Extending and networking subnets .................................................................5-32
5.10.2 Basic principles of MPI and DP subnets .........................................................5-34
5.10.3 Interfaces.........................................................................................................5-37
5.10.4 Network Components......................................................................................5-39
5.10.5 Cable length ....................................................................................................5-42
5.10.6 Sample networks.............................................................................................5-44
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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

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
iv A5E00203919-01
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7.1 Wiring ................................................................................................................7-1
7.2 Connecting the Protective Conductor to the Rail..............................................7-4
7.3 Adjusting the Power Supply Module to the Mains Voltage ...............................7-5
7.4 Wiring the power supply module and the CPU .................................................7-6
7.5 Wiring Front Connectors ...................................................................................7-8
7.6 Inserting Front Connectors into Modules ........................................................7-12
7.7 Labeling the Module I/O ..................................................................................7-13
7.8 Connecting shielded cables to the shielding contact element ........................7-14
7.9 Wiring the Bus Connector ...............................................................................7-17
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8.1 Addressing.........................................................................................................8-1
8.2 Slot-defined addressing of modules..................................................................8-1
8.3 User-defined addressing of modules ................................................................8-3
8.4 Addressing Signal Modules...............................................................................8-3
8.5 Addressing the Integrated I/O of the CPU.........................................................8-6
8.6 Consistent Data.................................................................................................8-7
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9.1 In this Chapter...................................................................................................9-1
9.2 Commissioning procedure.................................................................................9-1
9.3 Commissioning Checklist..................................................................................9-4
9.4 Insert the back-up battery or rechargeable battery...........................................9-5
9.5 Inserting and replacing a memory card.............................................................9-7
9.6 Commissioning the modules.............................................................................9-8
9.6.1 Connecting the PG............................................................................................9-8
9.6.2 Initial power on. ...............................................................................................9-12
9.6.3 Memory reset by means of the CPU mode selector switch ............................9-13
9.6.4 Starting SIMATIC Manager .............................................................................9-17
9.6.5 Monitoring and controlling I/Os........................................................................9-18
9.7 Commissioning PROFIBUS DP ......................................................................9-23
9.7.1 Commissioning PROFIBUS DP ......................................................................9-23
9.7.2 Commissioning the CPU as DP master ..........................................................9-24
9.7.3 Commissioning the CPU as DP slave.............................................................9-27
9.7.4 Direct Data Exchange .....................................................................................9-33
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10.1 In this Chapter.................................................................................................10-1
10.2 Backup of the CPU operating system .............................................................10-1
10.3 Updating the Operating System......................................................................10-3
10.4 Module replacement........................................................................................10-4
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 ...........................10-11

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01 v
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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 Reading Slave Diagnostic Data.....................................................................11-15
11.6.3 Interrupts on the DP Master..........................................................................11-21
11.6.4 Structure of the slave diagnostic data when the CPU is used as an
intelligent slave..............................................................................................11-22
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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
12.2.1 Basic Points for System Installations Conforming with EMC Requirements...12-3
12.2.2 Five Basic Rules for Ensuring EMC................................................................12-5
12.2.3 EMC Compatible Installation of PLC...............................................................12-7
12.2.4 Examples of an EMC Compatible Installation.................................................12-8
12.2.5 Shielding of Cables .......................................................................................12-11
12.2.6 Equipotential bonding....................................................................................12-12
12.2.7 Cable Routing inside Buildings......................................................................12-14
12.2.8 Outdoor cable routing....................................................................................12-16
12.3 Lightning and Surge Voltage Protection........................................................12-17
12.3.1 In the following sections ... ............................................................................12-17
12.3.2 Lightning Protection Zone Concept...............................................................12-17
12.3.3 Rules for the Transition Point between Lightning Protection
Zones 0 <-> 1................................................................................................12-19
12.3.4 Rules for the Transition Points between Lightning Protection
Zones 1 <-> 2 and Higher .............................................................................12-21
12.3.5 Sample of a Surge Protection Circuit for Networked S7-300 PLCs..............12-24
12.3.6 1 How to Protect Digital Output Modules against Inductive Surge Voltage..12-26
12.4 Safety of electronic control equipment..........................................................12-28
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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
vi A5E00203919-01
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1-1 Information Landscape of an S7-300...........................................................1-3
1-2 Additional Documentation ............................................................................1-4
1-3 SIMATIC Technical Support.........................................................................1-5
3-1 Installing an S7 system..................................................................................3-1
4-1 Example configuration: S7-300 components.................................................4-1
5-1 Horizontal and vertical installation .................................................................5-3
5-2 Shielding contact element..............................................................................5-5
5-3 Clearance.......................................................................................................5-6
5-4 Maximum configuration on one rack..............................................................5-8
5-5 Full assembly using racks............................................................................5-11
5-6 Power loss dissipated ..................................................................................5-16
5-7 S7-300 configuration with grounded reference potential
(CPU 313 – 318-2 DP)...............................................................................5-20
5-8 S7-300 configuration with floating reference potential
(CPU 313 – 318-2 DP)...............................................................................5-21
5-9 Configuration with isolated modules............................................................5-23
5-10 Configuration with non-isolated modules.....................................................5-24
5-11 Grounding concept for the S7-300 with CPU 312 IFM ................................5-28
5-12 Grounding concept for the S7-300 with CPU 31 x.......................................5-29
5-13 Example: S7-300 with load power supply from PS 307...............................5-31
5-14 Example of an MPI subnet...........................................................................5-44
5-15 Example: Maximum distance in the MPI subnet..........................................5-45
5-16 Example of a PROFIBUS subnet.................................................................5-46
5-17 Example: CPU 314C-2 DP as MPI and PROFIBUS nodes.........................5-47
5-18 Example of PG access across network boundaries (routing)......................5-48
5-19 Installing the terminating resistors in an MPI subnet .................................5-49
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 ..............................................7-10
7-5 Slide the labeled strips into the front panel..................................................7-13
7-6 Shielding contact element underneath two signal modules.........................7-15
7-7 Connecting 2-wire cables to the shielding contact element.........................7-16
7-8 Bus connector: Enabled and disabled terminating resistor..........................7-18
8-1 S7-300 slots and the associated module start addresses.............................8-2
8-2 Addresses of the I/O of digital modules.........................................................8-4
8-3 I/O Addresses of a digital module in Slot 4....................................................8-5
8-4 I/O addresses of an analog module in Slot 4.................................................8-6
9-1 Insert a back-up battery into CPUs 313/314..................................................9-6
9-2 Insert the memory card into the CPU.............................................................9-7
9-3 Connecting a PG to an S7-300......................................................................9-8
9-4 Connecting a PG to multiple S7 devices........................................................9-9
9-5 Connecting a PG to a subnet.......................................................................9-10
9-6 PG connected to an ungrounded S7-300 ....................................................9-11
9-7 Operation of mode selector switch for memory reset..................................9-14
9-8 Using the mode selector switch for a cold start (CPU 318-2 DP only) ......9-15
9-9 Transfer memory in the CPUs 31x-2 DP acting as DP slave ......................9-29
9-10 Direct data exchange with CPUs 31x-2 DP.................................................9-34
10-1 Unlocking the front connector and removing the module ............................10-5

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01 vii
10-2 Removing the front connector coding pin ....................................................10-6
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...........................................10-9
10-6 Location of fuses in the digital output module 120/230 VAC.....................10-12
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 node with direct data exchange.......11-15
11-5 Diagnostic addresses for DP masters and DP slaves...............................11-18
11-6 Structure of slave diagnostic data..............................................................11-22
11-7 Structure of the ID-specific diagnostics for CPU 31x-2..............................11-25
11-8 Structure of the module status...................................................................11-26
11-9 Structure of the interrupt status..................................................................11-27
11-10 Bytes y+4 to y+7 for a diagnostic interrupt (operating status
change by intelligent slave)......................................................................11-28
12-1 Possible paths of electromagnetic interference...........................................12-3
12-2 Example of an EMC compatible cabinet installation....................................12-8
12-3 Example of EMC compatible wall-mounting ..............................................12-10
12-4 Mounting cable shielding............................................................................12-12
12-5 Equipotential bonding.................................................................................12-13
12-6 Lightning protection zones of a building.....................................................12-18
12-7 Sample circuit for networked S7-300 PLCs...............................................12-24
12-8 EMERGENCY-OFF relay contact in the output circuit...............................12-26
12-9 Circuit for coils operated with DC voltage..................................................12-27
12-10 Circuit for coils operated with AC voltage ................................................12-27


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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
viii A5E00203919-01
7DEOHV
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...............................................................................2-3
5-1 Components of an S7-300: ..........................................................................4-2
4-1 Rails - overview............................................................................................5-4
4-2 Module width................................................................................................5-4
4-3 Shielding terminals - overview .....................................................................5-5
4-4 Interface modules - Overview ......................................................................5-9
4-5 Types of cabinet.........................................................................................5-14
4-6 Choice of cabinets......................................................................................5-16
4-7 VDE specifications for the installation of a PLC system ............................5-18
4-8 Protective grounding measures .................................................................5-25
4-9 Connection of the load voltage reference potential....................................5-27
4-10 Connection of the load voltage reference potential....................................5-28
4-11 Connection of the load voltage reference potential....................................5-29
4-12 Characteristics of load power supply units.................................................5-30
4-13 Nodes on the subnet..................................................................................5-34
4-14 MPI/PROFIBUS DP addresses..................................................................5-35
4-15 MPI addresses of CPs/FMs in an S7-300..................................................5-36
4-16 The following devices may be connected ..................................................5-38
4-17 Available bus cables...................................................................................5-39
4-18 Marginal conditions for wiring interior bus cables ......................................5-40
4-19 Bus connector ............................................................................................5-40
4-20 RS 485 repeater.........................................................................................5-41
4-21 PG patch cord ............................................................................................5-42
4-22 Permitted cable lengths in an MPI subnet segment...................................5-42
4-23 Permitted cable lengths in a PROFIBUS subnet segment.........................5-43
4-24 Stub cable lengths per segment.................................................................5-43
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 Wiring accessories.......................................................................................7-7
7-5 Assignment of front connectors to modules.................................................7-8
7-6 Assignment of front connectors to modules...............................................7-10
7-7 Wiring the front connector..........................................................................7-10
7-8 Assigning the labeling strips to modules....................................................7-13
7-9 Assigning the shielding diameter to shielding terminals ............................7-14
8-1 Integrate inputs and outputs on the CPU 312 IFM.......................................8-6
8-2 Integrate inputs and outputs on the CPU 314 IFM.......................................8-7
9-1 Recommended commissioning procedure - part I: Hardware .....................9-2
9-2 Recommended commissioning procedure - part II: software ......................9-3

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01 ix
9-3 Possible causes for the CPU memory reset request .................................9-13
9-4 Procedure for resetting the CPU memory..................................................9-14
9-5 Operations in the CPU during a memory reset..........................................9-16
9-6 Software requirements...............................................................................9-23
9-7 DP address areas of the CPUs..................................................................9-23
9-8 Event recognition by CPUs 31x-2 DP acting as the DP master ................9-25
9-9 Event recognition by CPUs 31x-2 DP acting as DP slave.........................9-28
9-10 Configuration example for the address areas in transfer memory.............9-30
10-1 Backup of the operating system on MC.....................................................10-2
10-2 Updating the operating system with MC/MMC...........................................10-3
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..........................................................................11-11
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........................................................................................11-14
11-10 Reading the diagnostic information using STEP 5 and
STEP 7 in the masters system.................................................................11-16
11-11 Event recognition by CPUs 31x-2 acting as the DP slave.......................11-19
11-12 Evaluation of RUN to STOP transitions in the DP master/DP slave........11-20
11-13 Structure of station status 1 (byte 0)........................................................11-23
11-14 Structure of station status 2 (byte 1)........................................................11-23
11-15 Structure of station status 3 (byte 2)........................................................11-24
11-16 Structure of the master PROFIBUS address (byte 3)..............................11-24
11-17 Structure of the vendor ID (byte 4, 5).......................................................11-24
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........................................................................................12-9
12-7 Routing cables inside buildings................................................................12-14
12-8 High-voltage protection of cables with surge voltage protection
components..............................................................................................12-20
12-9 Surge voltage protection components for lightning protection
zones 1 <-> 2 ...........................................................................................12-22
12-10 Surge voltage protection components for lightning protection
zones 2 <-> 3 ...........................................................................................12-23
12-11 Example of a lightning-protected structure (key to figure above) ............12-25

&RQWHQWV
S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
xA5E00203919-01


S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01 1-1
3UHIDFH 
3XUSRVHRIWKLVPDQXDO
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.
%DVLFNQRZOHGJHUHTXLUHG
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.
6FRSHRIWKH DQXDO
This manual is valid for CPUs with the following hardware and software versions:
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)LUPZDUH +DUGZDUH
CPU 312 IFM 6ES7 312-5AC02-0AB0
6ES6 312-5AC82-0AB0 1.0.0 01
CPU 313 6ES7 312-1AD03-0AB0 1.0.0 01
CPU 314 6ES7 314-1AE04-0AB0
6ES7 314-1AE84-0AB0 1.0.0 01
CPU 314 IFM 6ES7 314-5AE03-0AB0
6ES7 314-5AE83-0AB0 1.0.0 01
CPU 314 IFM 6ES7 314-5AE10-0AB0 1.0.0 01
CPU 315 6ES7 315-1AF03-0AB0 1.0.0 01
CPU 315-2 DP 6ES7 315-2AF03-0AB0
6ES7 315-2AF83-0AB0 1.0.0
CPU 316-2 DP 6ES7 316-2AG00-0AB0 1.0.0 01
CPU 318-2 DP 6ES7 318-2AJ00-0AB0 3.0.0 03

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
1-2 A5E00203919-01
$SSURYDOV
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
&(PDUN
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“
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The SIMATIC S7-300 product series is compliant with AS/NZS 2064 (Australia).
6WDQGDUGV
The SIMATIC S7-300 product series is compliant with the requirements and criteria
for IEC 61131-2.

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01 1-3
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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
S7-300 Automation System,
Hardware and Installation:
CPU 312 IFM - 318-2 DP
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
S7-300 Programmable Controller
Module Specifications
Function 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
IM 151-7 CPU, BM 147-1 CPU, BM 147-2 CPU
List of stored instructions of the CPUs and their
execution times.
List of executable blocks (OBs/SFCs/SFBs) 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.
The following Getting Starteds are available
to you:
You are reading this manual
- CPU 31xC:
- CPU 31x:
- CPU 31xC:
- CPU 31xC:
- CPU 31xC:
- CPU 31xC:
- CPU 31xC:
S7-300 Automation System,
Hardware and Installation:
CPU 31xC and CPU 31x
Commission
Commission
Positioning with Analog Output
Positioning with Digital Output
Counting
Point-to-Point Connection
Controlling
Figure 1-1 Information Landscape of an S7-300

3UHIDFH
S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
1-4 A5E00203919-01
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
part of the STEP 7 documentation package
Description of the SFCs, SFBs and OBs of the CPUs.
You can also find the description in the
STEP 7 Online Help.
Description of the technological functions of the
CPUs 312 IFM/314 IFM.
Figure 1-2 Additional Documentation
5HF\FOLQJDQG'LVSRVDO
The units described in this manual are recyclable, due to the low levels of harmful
substances they contain. For correct recycling and disposal of your old unit,
contact a certified disposal facility for electronic scrap.
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If you still have questions about how to use the products described in this manual,
then please contact your local Siemens dealer.
http://www.siemens.com/automation/partner
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We can provide training courses to help you get started with your S7-300 PLC.
Please contact your local Training Center or the Central Training Center in
Nuremberg, D-90327, Germany
Phone [phone]..
http://www.sitrain.com

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01 1-5
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In addition to your local dealer, you can also contact one of three Support Centers:
Johnson City
Johnson City
Nuernberg
Nuernberg
Beijing
Beijing
Figure 1-3 SIMATIC Technical Support
:RUOGZLGH (Nuremberg)
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Local time: 0:00 to 24:00 / 365
days a year
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
GMT: +1:00
(XURSH$IULFD (Nuremberg)
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Local time: Mo.-Fr. 8:00 to 17:00
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
GMT: +1:00
$PHULFD (Johnson City)
7HFKQLFDO6XSSRUWDQG
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Local time: Mo.-Fr. 8:00 to
17:00
Phone: [phone]
Fax: [phone]
E-mail: isd-
[e-mail]
GMT: –5:00
$VLD$XVWUDOLD (Peking)
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Local time: Mo.-Fr. 8:00 to 17:00
Phone: [phone]
Fax: [phone]
E-mail:
[e-mail]
GMT: +8:00
Technical Support and Authorization personnel generally speak both German and English.

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
1-6 A5E00203919-01
6HUYLFH6XSSRUWRQWKH,QWHUQHW
We offer you our complete knowledge base online on the Internet as a supplement
to our documentation.
http://www.siemens.com/automation/service&support
There you can find:
• Up-to-date product information (What's new), FAQs (Frequently Asked
Questions), Downloads, Tips and Tricks.
• Our Newsletter always offers you the latest information on your products.
• The Knowledge Manager finds the documents you require.
• Users and specialists all over the world share their experience in our Forum.
• You can find your local service partner for Automation & Drives in our Partner
Database.
• Information relating to on-site service, repairs, spare parts and lots more is
available to you in the "Service" section.


S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01 2-1
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you will find a guide to the documentation for the S7-300.
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Table 2-1 Influence of the ambient conditions on the automation system (AS)
,QIRUPDWLRQRQ LVDYDLODEOHLQ
What provisions do I have to make for PLC
installation space? Chapter &RQILJXULQJ0RXQWLQJGLPHQVLRQVRI PRGXOHVand 0RXQWLQJPRXQWLQJWKHUDLO, in the
,QVWDOODWLRQ0DQXDO
How do environmental conditions influence the
PLC? $SSHQGL[RIWKH,QVWDOODWLRQ0DQXDO
Table 2-2 Electrical isolation
,QIRUPDWLRQRQ LVDYDLODEOHLQ
Which modules can I use if electrical isolation is
required between sensors/actuators? Chapter &RQILJXULQJ(OHFWULFDODVVHPEO\ SURWHFWLYHPHDVXUHVDQGJURXQGLQJLQWKH
,QVWDOODWLRQ0DQXDO
Reference Manual 0RGXOH'DWD
When do I need to isolate the potential of individual
components?
How do I wire that?
Chapter &RQILJXULQJ(OHFWULFDODVVHPEO\
SURWHFWLYHPHDVXUHVDQGJURXQGLQJLQWKH
,QVWDOODWLRQ0DQXDO
Chapter LULQJLQWKH,QVWDOODWLRQ0DQXDO
When do I need to isolate the potential of specific
stations?
How do I wire that?
Chapter &RQILJXULQJ&RQILJXULQJDVXEQHWLQWKH
,QVWDOODWLRQ0DQXDO
Chapter LULQJLQWKH,QVWDOODWLRQ0DQXDO

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
2-2 A5E00203919-01
Table 2-3 Communication between sensors/actuators and the automation system
,QIRUPDWLRQRQ LVDYDLODEOHLQ
Which module is suitable for my sensor/actuator? for CPU: in applicable &38'DWDReference
Manual
for signal modules: 0RGXOH'DWDReference Manual
How many sensors/actuators can I connect to the
module? for CPU: in applicable &38'DWDReference Manual
for signal modules: 0RGXOH'DWDReference Manual
To connect my sensors/actuators to the PLC, how
do I wire the front connector ? Chapter LULQJ LULQJIURQWFRQQHFWRUVLQWKH ,QVWDOODWLRQ0DQXDO
When do I require expansion modules (EM), and
how are they connected? Chapter &RQILJXULQJRSWLRQDOH[SDQVLRQVDQG QHWZRUNLQJLQWKH,QVWDOODWLRQ0DQXDO
How do I mount modules in module racks / on
profile rails? Chapter 0RXQWLQJ0RXQWLQJPRGXOHVRQDUDLOLQ WKH,QVWDOODWLRQ0DQXDO
Table 2-4 Use of centralized and decentralized peripherals
,QIRUPDWLRQRQ LVDYDLODEOHLQ
Which range of modules do I want to use? for local I/O / expansion modules (EMs): 0RGXOH
'DWDReference Manual
for distributed I/Os / PROFIBUS DP: Manual of the
relevant I/O device, e.g. 0DQXDO(7%
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 &RQILJXULQJLQWKH,QVWDOODWLRQ0DQXDO
Which Interface modules (IM) do I need to connect
EMs to the CPU? Chapter &RQILJXULQJ$UUDQJLQJPRGXOHVRQ PXOWLSOHUDFNVLQWKH,QVWDOODWLRQ0DQXDO
What is the right power supply (PS) for my
application? Chapter &RQILJXULQJLQWKH,QVWDOODWLRQ0DQXDO

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01 2-3
Table 2-6 CPU performance
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Which memory concept is best suited for my
application? in applicable &38'DWDReference Manual
How do I insert and remove Micro Memory Cards? Chapter &RPPLVVLRQLQJ5HPRYLQJ,QVWDOOLQJ0LFUR
0HPRU\&DUGVLQWKH,QVWDOODWLRQ0DQXDO
Which CPU meets my requirements on
performance ? ,QVWUXFWLRQOLVW; Reference Manual &38'DWD
How fast is the response / processing time of the
CPU? in applicable &38'DWDReference Manual
Which technological functions are implemented? 7HFKQRORJLFDOIXQFWLRQVManual
How can I use these technological functions? 7HFKQRORJLFDOIXQFWLRQVManual
Table 2-7 Communication
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Which principles do I have to take into account? &RPPXQLFDWLRQZLWK6,0$7,&Manual
Which options and resources are available on the
CPU ? in applicable &38'DWDReference Manual
How do I optimize communication with the help of
communication processors (CPs)? the respective manual
Which type of communication network is best
suited to my application? Chapter &RQILJXULQJ&RQILJXULQJDVXEQHWLQWKH ,QVWDOODWLRQ0DQXDO
&RPPXQLFDWLRQZLWK6,0$7,&Manual
How do I network the individual components? Chapter &RQILJXULQJ and ZLULQJLQWKH,QVWDOODWLRQ
0DQXDO
Table 2-8 Software
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Which software do I require for my S7-300 system? Chapter 7HFKQLFDO6SHFLILFDWLRQ; applicable &38
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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 respective device manual
What options are offered by redundant and fail-safe
systems? Manual 6+5HGXQGDQW6\VWHPV; Manual )DLOVDIH6\VWHPV

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
2-4 A5E00203919-01