Siemens SIMATIC S5-115F User manual

SIMATIC S5
S5-115F
Programmable Controller
Manual
Volume 1/2
EWA 4NEB 811 6148-02

STEP ® and SIMATIC ® are registered trademarks of Siemens AG.
Copyright © Siemens AG 1991
Subject to change without prior notice.
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.
EWA 4NEB 811 6148-02

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Index
Appendices
Rules Governing the Use of the S5-115F
Technical Specifications
Communications Capabilities
Analog Value Processing
Addressing
System Startup
Installation Guidelines
Technical Description
System Overview
Introduction
Preface
Reliability, Availability and Safety of Electronic Control Systems
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EWA 4NEB 811 6148-02

Contents
Page
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xiii
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xv
1 System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 1
1.1 Areas of Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 1
1.2 Regulations for Applications Requiring Official Approval . . . . . . . . . . . . . 1- 1
1.3 System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 2
1.3.1 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 2
1.3.2 Central Processing Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 3
1.3.3 Input and Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 3
1.3.4 Intelligent Input/Output Modules and
Communications Processors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 4
1.4 Expansion Capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 4
1.4.1 Centralized Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 4
1.4.2 Distributed Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 4
1.5 Communications Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 5
1.6 Operator-Process Communication, Process Visualization,
and Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 6
1.7 Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 6
1.8 Redundancy Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 7
1.8.1 Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 7
1.8.2 Operating System - Additional Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 8
1.8.3 Control Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 8
1.8.4 Programmer Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1- 8
2 Technical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2- 1
2.1 Modular Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2- 1
2.2 Principle of Operation of the Programmable Controller . . . . . . . . . . . . . . 2- 3
2.2.1 Functional Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2- 3
2.2.2 Program Scanning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2- 5
2.2.3 Central Processing Unit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2- 9
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2.3 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2- 12
2.3.1 Backup Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2- 12
2.3.2 Memory Submodules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2- 12
2.3.3 Programmers (PG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2- 13
2.3.4 Printers (PT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2- 13
3 Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 1
3.1 Mounting Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 1
3.1.1 Central Controller (CC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 1
3.1.2 Expansion Units (EU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 4
3.2 Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 12
3.2.1 Installing the Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 12
3.2.2 Dimension Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 15
3.2.3 Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 18
3.2.4 Interconnecting the Two Subunits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 19
3.2.5 Centralized Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 21
3.2.6 Distributed Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 22
3.3 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 27
3.3.1 Connecting the PS 951F Power Supply Module . . . . . . . . . . . . . . . . . . . . . . .3 - 27
3.3.2 Connecting Digital Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 28
3.3.3 Connecting Analog Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 28
3.3.4 Front Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 29
3.3.5 Simulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 31
3.4 General Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 31
3.4.1 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 31
3.4.2 Electrical Installation with Field Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 34
3.4.3 Connecting Nonfloating and Floating Modules . . . . . . . . . . . . . . . . . . . . . .3- 39
3.5 Installing Programmable Controllers in Conformity with EMC . . . . . . . . . 3- 41
3.6 Wiring Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 42
3.6.1 Wiring Cables Inside and Outside a Cabinet . . . . . . . . . . . . . . . . . . . . . . . . .3- 42
3.6.2 Running Cables Outside Buildings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 43
3.7 Equipotential Bonding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 44
3.8 Shielding Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 45
3.9 Special Measures for Interference-Free Operation . . . . . . . . . . . . . . . . . . .3- 46
3.10 Checklist for the Installation of Programmable Controllers
in Conformity with EMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3- 49
4 System Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4- 1
4.1 Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4- 1
4.1.1 Controls on the Power Supply Module and Central Processing Unit . . . . 4 - 1
4.1.2 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4- 4
4.1.3 CPU Operation in ”RUN” and ”STOP” Modes . . . . . . . . . . . . . . . . . . . . . . .4- 6
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4.1.4 Cold Restart and Warm Restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4- 8
4.1.5 Battery Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4- 13
4.1.6 Overall Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4- 13
4.1.7 Steps for System Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4- 14
4.2 Working with Input/Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4- 18
4.3 System Startup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4- 18
4.3.1 Safety Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4- 18
4.3.2 Checking a Plant or Controlled System before Startup . . . . . . . . . . . . . . . .4- 19
5 Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 1
5.1 Address Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 1
5.1.1 Digital Module Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 1
5.1.2 Analog Module Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 1
5.2 Slot Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 2
5.3 Handling Process Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 5
5.3.1 Accessing the PII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 6
5.3.2 Accessing the PIQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 7
5.3.3 Direct Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 8
5.4 CPU Address Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 10
5.5 Process Interrupt Generation with the
6ES5 434-7LA12 Digital Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 12
5.5.1 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 12
5.5.2 Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 12
5.5.3 Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 13
5.5.4 Programming Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5- 15
6 Analog Value Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6- 1
6.1 Analog Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6- 1
6.2 460-7LA12 Analog Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6- 2
6.2.1 Connecting Sensors to the 460 Analog Input Module . . . . . . . . . . . . . . . . .6- 2
6.2.2 Startup of the 460 Analog Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . .6- 8
6.3 463-4U... Analog Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6- 11
6.3.1 Connecting Sensors to the 463 Analog Input Module . . . . . . . . . . . . . . . . .6- 11
6.3.2 463 Analog Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6- 14
6.4 Representation of the Digital Input Value . . . . . . . . . . . . . . . . . . . . . . . . . . .6- 16
6.4.1 Digital Representation of a Measured Value
(460 Analog Input Module) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6- 16
6.4.2 Digital Representation of a Measured Value
(463 Analog Input Module) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6- 22
6.5 Wire-break Signalling and Scanning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6- 26
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6.6 Analog Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6- 28
6.6.1 Method of Operation of the Analog Output Modules . . . . . . . . . . . . . . . .6- 28
6.6.2 Analog Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6- 29
6.7 Digital Representation of an Analog Value . . . . . . . . . . . . . . . . . . . . . . . . . .6- 31
6.8 I/O Module Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6- 33
6.9 Analog Value Matching Blocks FB 250 and FB 251 . . . . . . . . . . . . . . . . . . . .6- 37
7 Communications Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7- 1
7.1 Overview of Communications Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . .7- 1
7.2 SINEC L1 Local Area Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7- 1
7.2.1 Nonsafety-Related Connection between an S5-115F Slave and a
Master Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7- 3
7.2.2 Safety-Related Connection of Several S5-115Fs . . . . . . . . . . . . . . . . . . . . . .7- 13
7.2.3 Connecting Several S5-115Fs with S5 PLCs of the U Range . . . . . . . . . . . . 7 - 22
7.2.4 Safety-Related and Fault-Tolerant Networking . . . . . . . . . . . . . . . . . . . . . .7 - 30
7.2.5 The Mailbox Transfer Block FB 253 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7- 32
7.3 Programmers for the S5-115F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7- 32
7.3.1 Programmer Connected to the Serial Interface of the CPU . . . . . . . . . . . . 7 - 32
7.3.2 Programmer Connected to SINEC L1 Master . . . . . . . . . . . . . . . . . . . . . . . . .7- 33
7.4 CP 523 Serial I/O Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7- 34
7.4.1 Settings on the CP 523 Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7- 35
7.4.2 Use of the CP 523 in Print Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7- 37
7.4.3 Use of the CP 523 in Communications Mode . . . . . . . . . . . . . . . . . . . . . . . . .7- 44
7.4.4 Failsafe Characteristics of the CP 523 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7- 47
7.4.5 FB 252 Integral Function Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7- 48
8 Technical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 1
8.1 General Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 1
8.2 Description of the Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 3
8.2.1 Mounting Racks (CRs, ERs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 3
8.2.2 Power Supply Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 6
8.2.3 Central Processing Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 9
8.2.4 Digital Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 10
8.2.5 Digital Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 14
8.2.6 Digital Input/Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 20
8.2.7 Analog Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 26
8.2.8 Analog Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 31
8.2.9 Communications Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 37
8.2.10 Interface Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 38
8.3 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8- 42
viii EWA 4NEB 811 6148-02

Page
9 Reliability, Availability and Safety of Electronic Control Systems. . . . . . . . . . . . . 9- 1
9.1 Reliability of Electronic Control Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . .9- 1
9.1.1 Failure Characteristics of Electronic Devices . . . . . . . . . . . . . . . . . . . . . . . . .9- 2
9.1.2 Reliability of SIMATIC S5 Programmable Controllers and
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9- 2
9.1.3 Failure Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9- 3
9.2 Availability of Electronic Control Systems . . . . . . . . . . . . . . . . . . . . . . . . . . .9- 3
9.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9- 3
9.2.2 Availability of the S5-115F Programmable Controller . . . . . . . . . . . . . . . . .9- 4
9.3 Safety of Electronic Control Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9- 5
9.3.1 Safe Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9- 5
9.3.2 Safe Binary Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9- 6
10 Rules Governing the Use of the S5-115F. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 1
10.1 The User Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 1
10.2 The Logical Program Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 1
10.3 Response Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 2
10.3.1 Response Time in the Case of Cyclical Reading In and Output via
the Process I/O Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 3
10.3.2 Response Time in the Case of Direct Access in the Cyclic Program . . . . . 10- 3
10.3.3 Response Time in the Case of Direct Access in the Time
Interrupt OB (OB 13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 4
10.3.4 Response Time in the Case of Direct Access in the Process
Interrupt OB (OB 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 4
10.3.5 Response Times With the SINEC L1 LAN . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 5
10.4 Defining the PLC Cycle Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 7
10.5 Monitoring Times for Synchronization FB Calls (FB 254 SYNC) . . . . . . . . 10- 9
10.6 Discrepancy Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 10
10.7 Limitations of STEP 5 Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 11
10.7.1 Access to I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 11
10.7.2 Illegal Memory Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 12
10.7.3 Illegal STEP 5 Operations and Statements . . . . . . . . . . . . . . . . . . . . . . . . . .10- 12
10.7.4 Data Blocks Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 13
10.7.5 Jump Operations to Unloaded Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 13
10.7.6 Loadable Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 14
10.8 I/O Module Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 15
10.9 Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 17
10.9.1 Implementation of Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 17
10.9.2 Requirements to be Met by the Sensor Signals . . . . . . . . . . . . . . . . . . . . . .10- 17
10.9.3 Type 1 Digital Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 18
10.9.4 Type 2 Digital Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 19
10.9.5 Type 3 Digital Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 21
10.9.6 Checking Digital Input Modules in the Case of Non-Intermittent
Input Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 24
EWA 4NEB 811 6148-02 ix

Page
10.9.7 Direct Read Access to DI Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 24
10.9.8 Digital Input Module with Interrupt Capability (Interrupt DI) . . . . . . . 10- 25
10.10 Digital Output Modules (DQs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 27
10.10.1 Type 8 Digital Output Modules (DQs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 28
10.10.2 Type 9 and Type 10 Digital Output Modules . . . . . . . . . . . . . . . . . . . . . . .10- 29
10.10.3 Connecting Actuators to Digital Output Modules (DQs)
(Types 9 and 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 29
10.10.4 Checking Digital Output Modules Using Readback Digital Input
Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 37
10.11 Analog Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 37
10.11.1 Type 13 Analog Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 39
10.11.2 Type 14 Analog Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 40
10.11.3 Type 15 Analog Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 43
10.11.4 Checking Analog Input Modules Using Check Analog Output
Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 46
10.11.5 Type 16 Analog Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 46
10.12 Analog Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 50
10.12.1 Type 18 Analog Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 50
10.13 I/O Type Assignment of Unused Digital Words . . . . . . . . . . . . . . . . . . . .10- 51
10.14 I/O Type Assignment of Unused Analog Channels . . . . . . . . . . . . . . . . .10- 51
10.15 I/O Type Mixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 52
10.16 Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 52
10.16.1 Relationship Between Byte and Word Addressing . . . . . . . . . . . . . . . . .10 - 52
10.16.2 Address Grid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 53
10.17 Responding to I/O Module Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 57
10.17.1 Passivation of I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 59
10.17.2 Revoking Passivation of I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 60
10.17.3 Operating System and User Program Response in the Case of
I/O ETV 3 and 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 63
10.17.4 Repair Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 66
10.18 Handling the Programmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 - 66
10.18.1 Connecting the Programmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 66
10.18.2 Operator Entry in the Programmer in Safety Mode . . . . . . . . . . . . . . . .10- 67
10.19 SINEC L1 LAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 68
10.19.1 Polling List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 69
10.19.2 SINEC L1 Safety Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 69
10.19.3 Synchronization FB 254 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 70
10.19.4 Two-Channel SINEC L1 LAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 70
10.20 Individual Acceptance Test of the Safety-Related System . . . . . . . . . . . 10- 70
10.20.1 Planning Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 70
10.20.2 Pre-Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 72
10.20.3 System Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10- 73
x EWA 4NEB 811 6148-02

Page
Appendices
A Evaluation of Error DBs DB2 and DB3 without COM 115F. . . . . . . . . . . . . . . . . . . A - 1
B Slot Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B- 1
B.1 Power Supply Connector Pin Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . .B- 1
B.2 Connector Pin Assignments of the CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B- 2
B.3 Connector Pin Assignments of Analog Input/Output Modules . . . . . . . . B- 3
B.4 Connector Pin Assignments of the Interface Modules . . . . . . . . . . . . . . . .B- 4
B.4.1 Connector Pin Assignments of the Symmetrical and
Serial EU Interface Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B- 4
B.4.2 Connector Pin Assignments of the Symmetrical and
Serial CC Interface Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B- 5
B.4.3 Connector Pin Assigments of the Asymmetrical
IM 305/IM 306 Interface Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B- 6
B.5 Connector Pin Assignments of the ER 701-3 Subrack . . . . . . . . . . . . . . . . . .B- 7
B.6 Legend for Connector Pin Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B- 10
C Prototype Test Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C- 1
D SIEMENS Addresses Worldwide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D- 1
Abbreviations
Index
EWA 4NEB 811 6148-02 xi

S5-115F Manual Preface
Preface
The S5-115F is a failsafe programmable controller for the mid performance range. It is for use
wherever safety is the first priority and where potential dangers must be avoided.
Hardwired solutions have dominated failsafe technology until now. With the S5-115F, you can
now apply all the advantages of our programmable controllers (PLCs) to your safety-related
controls. You write your process-oriented program as before and then enter all safety-related data
with the COM 115F programming software.
You require detailed information in order to use the controller to its best advantage.
This manual aims to provide the necessary information in condensed form without overloading
the user with superfluous knowledge, which means:
• Standardization of terminology
• More detailed breakdown of subjects
• Illustration of individual problems
• User-friendly arrangement of the contents
• Particular observance of the rules of safety technology
In this way, you will gain all the information required to operate your S5-115F. This manual is
aimed at:
• Users with little previous experience
• SIMATIC S5 experts
• Officials conducting Licensing Authority acceptance tests.
However, the applications are so numerous that not all the problems that might occur can be dealt
with in one manual. You will find a list of Siemens representatives in the Appendix who will help
you in those cases where the manual cannot answer your questions.
EWA 4NEB 811 6148-02 xiii

S5-115F Manual Introduction
Introduction
Please read the introduction carefully. You will then find it easier to use the manual and this will
save time.
This manual contains a detailed description of the S5-115F PLC with the CPU 942-7UF15.
For the description of the S5-115F PLC with the CPU 942-7UF11 or CPU 942-7UF12, see the manual
with the order no. 6ES5 998-1UF21. For the description of the CPU 942-7UF13 or CPU 942-7UF14
(incl. product information), see the manual with the order no. 6ES5 998-1UF23.
Description of Contents
This manual consists of two volumes and contains a detailed description of our SIMATIC S5-115F
failsafe programmable controller.
Volume 1 contains the description of the hardware components. The contents of this volume can
be divided into blocks according to topic:
• Reference manual
(System Overview, Technical Description)
• Installation and operation
(Installation Guidelines, Startup, Addressing)
• Special capabilities
(Analog Value Processing, Communications Capabilities)
• Overview of technical specifications
• Safety-related rules and regulations
Volume 2 contains the description of the software components. The contents of this volume can
be divided into blocks according to the following topics:
• Working with COM 115F programming software
In the chapter ”Configuring with COM 115F” you will find all the steps you require for con-
figuring your S5-115F with the CPU 942-7UF15. Of course, you can also configure pro-
grammable controllers with the CPU 942-7UF11 to CPU 942-7UF14 using COM 115F system
software, Version 3.2.
• Programming Guide
(Introduction to STEP 5, STEP 5 Operations)
• Testing
(Program Test, Error Diagnostics)
• Blocks
(Description of integral blocks and the use of loadable function blocks)
• Simple installation example with configuration of an S5-115F
You will find additional information in tabular form in the Appendices.
At the end of the book you will find correction forms. Please enter in these forms any suggestions
you may have for improvements and corrections and send them to us. Your comments will help us
to improve the next edition.
EWA 4NEB 811 6148-02 xv

Introduction S5-115F Manual
Conventions
In order to improve the readability of the manual, a menu-style breakdown was used, i.e.:
• The individual chapters can be quickly located by means of a thumb register.
• At the front of the manual is an overview containing the headings of the individual chapters.
• Each chapter has its own detailed table of contents.
The individual chapters are subdivided into sections and subsections. Bold-face type is used for
further subdivisions.
• Figures and tables are numbered separately in each chapter. The page following the chapter
table of contents contains a list of the figures and tables appearing in that chapter.
Certain conventions were observed when writing the manual. These are explained below.
• A number of abbreviations have been used.
Example: CPU (central processing unit)
• Footnotes are identified by superscripts consisting of a small digit (e.g. ”1”) or ”*”. The actual
footnote is generally at the bottom left of the page.
• Cross-references are shown as follows:
”( 7.3.2)” refers to subsection 7.3.2.
No references are made to individual pages.
• Dimensions in drawings are given in ”mm” with the value in inches given in brackets.
Example: 187 (7.29).
• Values may be given in binary, decimal or hexadecimal numbers. The number system used is
indicated in each case with a subscript, e.g. F000H.
• Information of special importance is printed black-framed ”windows”.
!Warning
See the Safety-Related Guidelines for the user for definitions of the terms ”Note”, ”Caution”,
”Important”, ”Warning” and ”Danger”.
Manuals can only describe the current version of the programmable controller. Should
modifications or supplements become necessary in the course of time, a supplement will be
prepared and included in the manual the next time it is revised. The relevant version or edition of
the manual appears on the cover. The present manual is edition ”1”. In the event of a revision, the
edition number will be incremented by ”1”.
xvi EWA 4NEB 811 6148-02

S5-115F Manual Introduction
Courses
Siemens provides SIMATIC S5 users with extensive opportunities for training.
For more information, please contact your Siemens representatives.
Reference Literature
This manual is a comprehensive description of the S5-115F programmable controller. Topics not
specific to the S5-115F, however, are only briefly dealt with. You will find more detailed in-
formation in the following literature:
•Automating with the S5-115U
SIMATIC S5 Programmable Controllers
Hans Berger
Siemens AG, Berlin and Munich 1987
Contents:
- STEP 5 programming language
- Program scanning
- Integral program blocks
- Interfaces to the I/Os
Order No.: ISBN 3-8009-1484-0
You will find information on the range of controllers and programmers in the following catalogs:
• ST 52.3 ”S5-115U, S5115H and S5115F Programmable Controller”
• ST 57 ”Standard Functions Blocks and Driver Software for Programmable Controllers of
the U Range”
• ST 59 ”Programmers”
• ET 1.1 ”ES 902 C 19 in. Packaging System”
• MP 11 Thermocouples, Compensation Boxes
Further components and modules (e.g. CPs and SINEC L1) have their own manuals. We will refer
you to these sources at the appropriate points in the text.
EWA 4NEB 811 6148-02 xvii

1 System Overview
1.1 Areas of Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 1
1.2 Regulations for Applications Requiring Official Approval . . . . . . . . 1 - 1
1.3 System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 2
1.3.1 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 2
1.3.2 Central Processing Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 3
1.3.3 Input and Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 3
1.3.4 Intelligent Input/Output Modules and
Communications Processors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 4
1.4 Expansion Capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 4
1.4.1 Centralized Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 4
1.4.2 Distributed Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 4
1.5 Communications Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 5
1.6 Operator-Process Communication, Process Visualization,
and Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 6
1.7 Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 6
1.8 Redundancy Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 7
1.8.1 Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 7
1.8.2 Operating System - Additional Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 8
1.8.3 Control Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 8
1.8.4 Programmer Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 8
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EWA 4NEB 811 6148-02

Figures
1-1. S5-115F Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 2
1-2. Hardware Structure Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 7
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S5-115F Manual System Overview
1 System Overview
1.1 Areas of Application
The S5-115F programmable controller is used in the most varied industrial fields. The following are
the main areas of application:
• Safety-oriented applications requiring official authorization
(e.g. burner controls, cable-car controls, fairground carousels)
• Applications not requiring official approval but constituting a high degree of danger for per-
sonnel and environment (e.g. controls for chemical processes)
• Applications with high capital risk (e.g. controls for processing expensive materials).
1.2 Regulations for Applications Requiring Official Approval
The failsafe S5-115F has been prototype-tested by the Bavarian Technical Inspectorate (TÜV). The
prototype test covers a range of different regulations laid down by the various supervisory bodies
and professional associations.
The S5-115F meets the requirements for safety-related applications
• with TÜV safety class 2
• with quality level 6 to DIN V 19250
TÜV safety classes
The Technical Inspectorate (TÜV) has arranged the requirements laid down in the regulations into
five safety classes with the strictest requirements in safety class 1. It should be noted that the
safety class is not necessarily an indication of the risk involved in the areas of application in
question.
The S5-115F PLC meets the requirements of all regulations belonging to safety class 2 of the
Technical Inspectorate. This means that the regulations of safety classes 3 to 5 are also met:
Class 2: - Elevator controls to TRA 200/101
- Escalator controls (not to EN 115)
Class 3: - Road traffic signal systems to DIN 57832/VDE 0832
- Electrical equipment of furnaces to DIN 57116/VDE 0116
- Telecontrol installations for gas and oil pipelines to TRGL 181
- Fairground carousels (present plants)
- Cable-car controls
Class 4: - Electromedical equipment to DIN IEC 601/VDE 0750
- Remote radio control for cranes to ZH1/547
- Manufacturing and processing machines to DIN 57113/VDE 0113
- Flame monitoring equipment
- Lifting platforms to VBG 14
Class 5: - Powered gates (controls)
Quality levels to DIN V 19250
The classification to DIN 19250 is not based on existing regulations but rather uses risk parameters
to define the risk inherent in a process. Risk parameters are the degree of damage, duration of
stay in danger areas, the possibility of avoiding danger and the probability of undesired states
arising. The risk graph gives information on the quality level in the case of protection facilities for
measurement, open-loop control and closed-loop control.
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System Overview S5-115F Manual
1.3 System Components
The S5-115F system is made up of various modular components, as pictured in Figure 1-1. These
components include the following:
• Power supply modules (PS)
• Central processing units (CPU)
• Input and output modules (I/O)
• Interface modules
• CP 523 communications processor
Figure1-1. S5-115FComponents
1.3.1 Power Supply
The power supply module (PS) converts the external power supply to the internal operating
voltage. Supply voltage for the S5-115F is 24 V DC. The 24 V DC system voltage must be reliably
isolated from the line voltage (e.g. 220 V).
Screw-type terminals connect the power supply lines to the bottom of the PS.
Lithium batteries ensure that the CPU RAM is backed up in the event of a power failure. Battery
failure is indicated by an LED. Backup voltage can be supplied externally via sockets so that the
batteries can be changed also when the PLC is in RUN.
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S5-115F Manual System Overview
1.3.2 Central Processing Unit
The central processing unit (CPU) is the ”brain” of the programmable controller. It executes the
control program.
The CPU 942F is used in the S5-115F. This is a slightly modified version of the CPU 942 in the
S5-115U.
• PG/SINEC L1 interface optocoupler, for reliable electrical isolation
• No 5.2 V supply for the SINEC L1 terminal on the interface connector (so that the SINEC L1 LAN
does not bypass the reliable isolation, even in the event of a fault)
• Operating system with all the safety functions of the S5-115F
You can use the CPU 942F in combination with analog modules and closed-loop control software
to control nonsafety-related processes. A PID algorithm is integrated in the operating system of
this CPU. Time constants starting at approximately one second are possible. You can implement a
maximum of eight control loops.
1.3.3 Input and Output Modules
Input and output modules are the interfaces to the sensors and actuators of a machine or
controlled system.
The following features make S5-115F modules easy to handle:
• Fast installation
• Mechanical coding
• Large labeling areas
Digital Modules
Digital modules conform to the voltage and current levels of your machine.
Digital modules have the following convenient features:
• Connection of signal lines via front connectors
• A choice of screw-type or crimp snap-in connections
Analog Modules
As a programmable controller's degree of performance increases, so does the significance of its
analog value processing. The significance of the analog input and output modules increases
accordingly.
The S5-115F offers the AE 460 and 463 nonfloating analog input modules. The desired level for the
AE 460 is set via range cards and for the AE 463 via jumpers in the front connector. A range card is
required for each of the four channels on the AE 460. This feature allows you to do the following:
• Have up to two different measuring ranges on one module.
• Change the measuring ranges simply by exchanging range cards.
In the case of the AE 463, the measuring range is jumpered separately for each of the four
channels.
One analog output module covers the various voltage or current ranges of analog actuators.
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System Overview S5-115F Manual
1.3.4 Intelligent Input/Output Modules and Communications Processors
You can connect the CP 523 to the S5-115F direct in the central controller or in expansion units of
one of the subunits. All further CPs and IPs of the SIMATIC family are used via an S5 controller of
the U range (S5-115U, -135U, -150U, -155U) connected via a SINEC L1 LAN.
Intelligent input/output modules (IPs) preprocess input signals and data.
Communications modules (CPs) control communications using:
• Operator panels
• Process visualization panels
• Other programmable controllers
Intelligent I/Os and communications processors the offload the CPU considerably.
1.4 Expansion Capability
If the connection capability of one central controller (CC) is no longer sufficient for your machine
or system, increase the capacity with expansion units (EUs).
Interface modules connect a CC to EUs and connect EUs to each other. Choose an interface module
to suit the controller configuration you need.
1.4.1 Centralized Configuration
The interface modules for centralized configurations connect bus lines and supply voltage to the
EUs. The expansion units in such configurations therefore need no power supplies of their own.
A centralized configuration allows you to connect up to three EUs to one CC. The cables between
the individual controllers or expansion units have a total maximum length of 2.5 m (8.2 ft.).
1.4.2 Distributed Configuration
A distributed configuration allows you to relocate expansion units nearer to the sensors and
actuators of your machine.
Distributed configurations reduce cabling costs for these devices.
The flexibility of a controller is of decisive importance for the productivity of a manufacturing
plant. Complex control tasks can be shared out among distributed controllers in order to achieve
the highest possible flexibility.
This means you have:
• Smaller, more manageable units. This makes configuring, startup, diagnostics, modification
and operation easier, and facilitates monitoring of the overall process.
• More availability in the system since the remaining system can continue to operate despite the
failure of one unit.
Information flow between the individual controllers must be guaranteed in the case of distributed
systems so that
• Data can be exchanged between the individual programmable controllers
• Manufacturing plants can be monitored, operated and controlled centrally
• Management information can be gathered (e.g. production data and stock levels).
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