Siemens Simatic S7-400 User manual

Preface, Contents
Product Overview 1
Installing the S7-400 2
Addressing the S7-400 3
Wiring the S7-400 4
Networking 5
Commissioning 6
Maintenance 7
Appendices
Assembling and
Installing Systems A
Guidelines for Handling Electro-
statically-Sensitive Devices (ESD) B
Glossary, Index
11/2006
A5E00850741-01
Automation System S7-400
Hardware and Installation
Installation Manual
SIMATIC
This manual is part of the documentation
package with the order number
6ES7498-8AA05-8BA0

!Danger
indicatesthat death or severe personal injury will result if proper precautions are not taken.
!Warning
indicates that death or severe personal injury may result if proper precautions are not taken.
!Caution
with a safety alert symbol indicates that minor personal injury can result if proper precautions are not
taken.
Caution
without a safety alert symbol indicates that property damage can result if proper precautions are not
taken.
Notice
indicates that an unintended result or situation can occur if the corresponding notice is not taken into
account.
If more than one degree of danger is present, the warning notice representing the highest degree of
danger will be used. A notice warning of injury to persons with a safety alert symbol may also include a
warning relating to property damage.
Qualified Personnel
The device/system may only be set up and used in conjunction with this documentation. Commissioning
and operation of a device/system may only be performed by qualified personnel. Within the context of the
safety notices in this documentation qualified persons are defined as persons who are authorized to
commission, ground and label devices, systems and circuits in accordance with established safety
practices and standards.
Prescribed 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.
Correct, reliable operation of the product requires proper transport, storage, positioning and assembly as
well as careful operation and maintenance.
Trademarks All names identified by ®are registered trademarks of the Siemens AG.
The remaining trademarks in this publication may be trademarks whose use by third parties for their own
purposes could violate the rights of the owner.
Disclaim of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However,
the information in this publication is reviewed regularly and any necessary corrections are included in sub-
sequent editions.
Safety Guidelines
This manual contains notices you have to observe in order to ensure your personal safety, as well as to
prevent damage to property. The notices referring to your personal safety are highlighted in the manual by
a safety alert symbol, notices referring to property damage only have no safety alert symbol. The notices
shown below are graded according to the degree of danger.
Copyright ESiemensAG 2006
Technical data subject to change
SIEMENS AG
Automation and Drives
Postfach 4848
90437 NÜRNBERG
GERMANY
A5E00850741-01
11/2006

iii
Automation System S7-400 Hardware and Installation
A5E00850741-01
Preface
Purpose of the Manual
The manual contains reference information on operator actions, descriptions of
functions and technical specifications of the central processing units, power supply
modules and interface modules of the S7-400.
How to configure, assemble and wire these modules (and other) in an S7-400
system is described in the installation manuals for each system.
Required Basic Knowledge
You will need general knowledge of automation to understand this manual.
Prerequisite is also sufficient knowledge in the use of computers or PC-type
equipment (programming devices, for example) with Windows 2000 or XP
operating system. The S7-400 system is configured in STEP 7 standard software.
You should therefore have sufficient knowledge of this standard software. This
knowledge is provided in the “Programming with STEP 7” manual.
Please note the information on the safety of electronic control systems in the
appendix of this manual, in particular when operating an S7-400 in safety-relevant
areas.
Scope of this Manual
The manual applies to the S7-400 automation system.
Approvals
You can find details on approvals and standards in the “Module Data” reference
manual.
Place of this Documentation in the Information Environment
This manual is part of the documentation package for S7-400.
System Documentation Package
S7-400 •S7-400 Programmable Controller;Hardware and Installation
•S7-400 Programmable Controllers; Module Data
•Automation System S7-400; CPU Data
•S7-400 Instruction List

Preface
iv Automation System S7-400 Hardware and Installation
A5E00850741-01
Navigating
The manual offers the following access help to make it easy for you to find specific
information:
•At the start of the manual you will find a complete table of contents and a list of
the diagrams and tables that appear in the manual.
•An overview of the contents of each section is provided in the left column on
each page of each chapter.
•You will find a glossary in the appendix at the end of the manual. The glossary
contains definitions of the main technical terms used in the manual.
•At the end of the manual you will find a comprehensive index which gives you
rapid access to the information you need.
Recycling and Disposal
The S7-400 is low in contaminants and can therefore be recycled. To recycle and
dispose of your old device in an environment-friendly manner, please contact a
disposal company certified for disposal of electronic waste.
Further Support
If you have any technical questions, please get in touch with your Siemens
representative or responsible agent .
You will find your contact person at:
http://www.siemens.com/automation/partner
You will find a guide to the technical documentation offered for the individual
SIMATIC Products and Systems here at:
http://www.siemens.com/simatic-tech-doku-portal
The online catalog and order system is found under:
http://mall.automation.siemens.com
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
v
Automation System S7-400 Hardware and Installation
A5E00850741-01
Technical Support
You can reach the Technical Suport for all A&D products
•Via the Web formula for the Support Request
http://www.siemens.com/automation/support-request
•Phone: + 49 180 5050 222
•Fax:+ 49 180 5050 223
Additional information about our Technical Support can be found on the Internet
pages:
http://www.siemens.com/automation/service.
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.
•Information on field service, repairs, spare parts and more under “Services”.

Preface
vi Automation System S7-400 Hardware and Installation
A5E00850741-01

vii
Automation System S7-400 Hardware and Installation
A5E00850741-01
Contents
1 Product Overview 1-1......................................................
2 Installing the S7-400 2-1....................................................
2.1 S7-400 Installation 2-2..............................................
2.2 Installing the Central Rack (CR) and Expansion Rack (ER) 2-6............
2.3 Segmented CR 2-8.................................................
2.4 Subdivided CR 2-9..................................................
2.5 Mounting and Grounding the Racks 2-10................................
2.6 Chassis Terminal Connection in the Non-Isolated Configuration 2-16........
2.7 Methods of Ventilation 2-18...........................................
2.8 Changing the Ventilation with the Cable Duct and Fan Subassembly 2-20...
2.9 Installing the Fan Subassembly 2-22...................................
2.10 Installing the Cable Duct 2-24.........................................
2.11 Choosing and Setting up Cabinets with the S7-400 2-25..................
2.12 Rules for the Arrangement of Modules 2-29.............................
2.13 Installing Modules in a Rack 2-30......................................
2.14 Marking the Modules with Slot Labels 2-33..............................
2.15 Methods of Expansion and Networking 2-34.............................
2.16 Accessories 2-35....................................................
3 Addressing the S7-400 3-1..................................................
3.1 Geographical and Logical Addresses 3-2..............................
3.2 How to Determine the Default Address of a Module 3-4..................
3.3 How to Determine the Default Address of a Channel 3-6.................
4 Wiring the S7-400 4-1.......................................................
4.1 Supplying Power to Modules 4-2......................................
4.2 Choosing the Power Supply Module 4-3...............................
4.3 Choosing the Load Current Power Supply 4-4..........................
4.4 Assembling an S7-400 with Process I/Os 4-5...........................
4.5 Assembling an S7-400 with Grounded Reference Potential (M) 4-7........
4.6 Assembling an S7-400 with Ungrounded Reference Potential
(Ungrounded Configuration) 4-8......................................
4.7 Assembling an S7-400 with Isolated Modules 4-10.......................
4.8 Parallel Wiring of Digital S7-400 Outputs 4-12...........................

Contents
viii Automation System S7-400 Hardware and Installation
A5E00850741-01
4.9 Grounding 4-13......................................................
4.10 Interference-Free Configuration for Local and Remote Connections 4-15....
4.11 Wiring Rules 4-17....................................................
4.12 Wiring the Power Supply Module 4-18..................................
4.13 Wiring the Signal Modules 4-22........................................
4.14 Wiring the Front Connector, Crimping 4-24..............................
4.15 Wiring the Front Connector, Screw Terminals 4-25.......................
4.16 Wiring the Front Connector, Spring-Type Terminals 4-26..................
4.17 Fitting the Strain Relief 4-28...........................................
4.18 Labeling a Front Connector 4-29.......................................
4.19 Fitting the Front Connector 4-32.......................................
4.20 Interconnecting the CR and ER(s) 4-35.................................
4.21 Setting the Fan Subassembly to the Line Voltage and Wiring It 4-37........
4.22 Cable routing in cable ducts or fan subassemblies 4-38...................
4.23 Routing Fiber-Optic Cables 4-38.......................................
5 Networking 5-1.............................................................
5.1 Configuring a Network 5-2...........................................
5.2 Fundamentals 5-3..................................................
5.3 Rules for Configuring a Network 5-7...................................
5.4 Cable Lengths 5-15..................................................
5.5 PROFIBUS-DP Bus Cables 5-18.......................................
5.6 Bus Connectors 5-19.................................................
5.7 RS 485 Repeater / Diagnostics Repeater 5-21...........................
5.8 PROFIBUS-DP Network with Fiber-Optic Cables 5-22....................
5.8.1 Fiber-Optic Cables 5-24..............................................
5.8.2 Simplex Connectors and Connector Adapter 5-26........................
5.8.3 Connecting a Fiber-Optic Cable to the PROFIBUS Device 5-28............
6 Commissioning 6-1........................................................
6.1 Recommended Procedure for First Startup 6-2.........................
6.2 Checks Prior to Switching On for the First Time 6-3......................
6.3 Connecting a Programming Device (PG) to an S7-400 6-5...............
6.4 Switching On an S7-400 for the First Time 6-6..........................
6.5 Resetting the CPU with the Mode Selector Switch 6-7...................
6.6 Cold, Warm, and Hot Restarts with the Mode Selector Switch 6-10.........
6.7 Inserting a Memory Card 6-11.........................................
6.8 Inserting a Backup Battery (Option) 6-13................................
6.9 Starting Up a PROFIBUS-DP Subnet 6-17..............................
6.10 Installing Interface Modules (CPU 414-2, 414-3, 416-3, 417-4
and 417-4H) 6-18....................................................

Contents
ix
Automation System S7-400 Hardware and Installation
A5E00850741-01
7 Maintenance 7-1...........................................................
7.1 Replacing the Backup Battery 7-2.....................................
7.2 Replacing a Power Supply Module 7-4.................................
7.3 Replacing CPUs 7-5................................................
7.4 Replacing Digital or Analog Modules 7-7...............................
7.5 Changing the Fuses in the Digital Modules 7-9..........................
7.6 Replacing Interface Modules 7-11......................................
7.7 Replacing the Fuse of the Fan Subassembly 7-13........................
7.8 Replacing Fans in the Fan Subassembly During Operation 7-14............
7.9 Replacing the Filter Frame of the Fan Subassembly During Operation 7-16..
7.10 Replacing the Power Supply PCB and Monitoring PCB
of the Fan Subassembly 7-18..........................................
7.11 Replacing Interface Submodules 7-19..................................
A Assembling and Installing Systems A-1......................................
A.1 General Rules and Regulations for Operating the S7-400 A-2.............
A.2 Principles of System Installation for EMC A-5...........................
A.3 Installation of Programmable Controllers for EMC A-9....................
A.4 Examples of EMC-Compatible Assembly A-10...........................
A.5 Shielding Cables A-13................................................
A.6 Equipotential Bonding A-15............................................
A.7 Cabling Inside Buildings A-17..........................................
A.8 Cabling Outside Buildings A-19........................................
A.9 Lightning Protection and Overvoltage Protection A-20.....................
A.9.1 Lightning Protection Zone Concept A-21................................
A.9.2 Rules for the Transition between Lightning Protection Zones 0 and 1 A-23...
A.9.3 Rules for the Transitions between Lightning Protection Zones 1 <-> 2
and Greater A-25....................................................
A.9.4 Sample of a Surge Protection Circuit for Networked S7-400 PLCs A-28.....
A.10 How to Protect Digital Output Modules against Inductive Surge A-30........
A.11 Safety of Electronic Control Equipment A-32.............................
A.12 Interference-Free Connection of Monitors A-34...........................
B Guidelines for Handling Electrostatically-Sensitive Devices (ESD) B-1..........
B.1 What is ESD? B-2...................................................
B.2 Electrostatic Charging of Persons B-3.................................
B.3 General Protective Measures Against Electrostatic Discharge Damage B-4.
Glossary
Index

Contents
xAutomation System S7-400 Hardware and Installation
A5E00850741-01
Figures
2-1 Rack Fitted with Modules in the S7-400 System 2-2.....................
2-2 Max. Cabinet Ambient Temperature as a Function of Power Dissipation
of Equipment in the Cabinet 2-27......................................
2-3 Removing the Cover 2-31.............................................
2-4 Attaching the Modules 2-32...........................................
2-5 Screwing the Modules in Place 2-32....................................
2-6 Fitting a Slot Label 2-33...............................................
4-1 Operating the S7-400 from a Grounded Supply 4-6......................
4-2 An S7-400 Configured with Grounded Reference Potential 4-7............
4-3 An S7-400 Configured with Ungrounded Reference Potential 4-8..........
4-4 Simplified Representation of Configuration with Isolated Modules 4-11......
4-5 Parallel Wiring of a Digital Output with Different Rated Load Voltages 4-12...
4-6 Parallel Wiring of a Digital Output with Identical Rated Load Voltages 4-12...
4-7 Grounded connection load voltage 4-14.................................
4-8 Shielding and Grounding the Connecting Cable for a Remote Connection 4-16
4-9 Disconnecting power supply connector 4-18.............................
4-10 Wiring the power supply connector 4-20................................
4-11 Plugging the power supply connector 4-21..............................
4-12 Preparing to wire the front connector 4-23...............................
4-13 Wiring a Front Connector with Crimp Terminals 4-24......................
4-14 Wiring a Front Connector with Screw-Type Terminals 4-25.................
4-15 Wiring a Front Connector with Spring-Type Terminals 4-26................
4-16 Principle of the spring contact 4-27.....................................
4-17 Fitting a Strain Relief (Viewed from Below) 4-28..........................
4-18 Fitting the Labels on the Front Connector 4-29...........................
4-19 Fitting a Label in the Front Connector 4-30..............................
4-20 Attaching the Front Connector 4-33....................................
4-21 Screwing On the Front Connector 4-34.................................
4-22 Plugging a Connecting Cable into a Send IM 4-35........................
4-23 Connection Between a Send IM and Two Receive IMs 4-36...............
4-24 Wiring the Fan Subassembly 4-37......................................
5-1 Communication between Programming Device/Operator Panel
and a Module without MPI 5-5........................................
5-2 Data Exchange 5-6.................................................
5-3 Terminating resistor on bus connector 5-9..............................
5-4 Terminating resistor on RS 485 repeater 5-9............................
5-5 Terminating resistor on MPI network 5-10...............................
5-6 Example of an MPI network 5-11.......................................
5-7 Example of a PROFIBUS DP network 5-12..............................
5-8 Example with CPU 414-2 5-13.........................................
5-9 Programming device access beyond network limits 5-14..................
5-10 Configuration of an MPI network 5-17...................................
5-11 Bus connector 5-19..................................................
5-12 Switch on terminating resistant 5-20....................................
5-13 Optical PROFIBUS-DP Network with Nodes that have an
Integrated Fiber-Optic Cable Interface 5-23..............................
5-14 Simplex Connectors and a Special Connector Adapter for the IM 153-2 FO
and IM 467 FO (installed) 5-27.........................................
6-1 Connecting PG to an S7-400 6-5......................................
6-2 Positions of the mode selector switch 6-8..............................
6-3 Inserting a Memory Card in a CPU 6-12.................................
6-4 Inserting Interface Submodules in the CPU 6-19.........................
7-1 Inserting an Interface Submodule in a CPU 7-20.........................

Contents
xi
Automation System S7-400 Hardware and Installation
A5E00850741-01
A-1 The Possible Routes for Electromagnetic Interference A-5................
A-2 Example of Cabinet Installation for EMC A-10............................
A-3 Wall Mounting an S7-400 for EMC A-12.................................
A-4 Mounting Cable Shields A-14..........................................
A-5 Routing Equipotential Bonding Conductor and Signal Line A-16............
A-6 Lightning Protection Zones of a Building A-22............................
A-7 Sample Circuitry for Networked S7-400 PLCs A-28.......................
A-8 Relay Contact for EMERGENCY OFF in the Output Circuit A-30............
A-9 Suppression for DC-Operated Coils A-31................................
A-10 Suppression with AC-Operated Coils A-31...............................
A-11 Shielding and Grounding with a Great Distance between Monitor
and Programmable Controller A-36.....................................
B-1 Electrostatic Voltages which can build up on a person B-3................

Contents
xii Automation System S7-400 Hardware and Installation
A5E00850741-01
Tables
2-1 Cabinet types 2-26...................................................
2-2 Modules in the different racks 2-29.....................................
2-3 Accessories for Modules and Racks 2-35...............................
4-1 VDE Specifications for Assembling a Programmable Controller 4-5........
4-2 Methods of Protective Grounding 4-13..................................
4-3 Grounded connection load voltage 4-14.................................
4-4 Front connector coding elements 4-32.................................
5-1 Permitted Cable Length of a Segment in an MPI Network 5-15.............
5-2 Permitted Cable Length of a Segment in the PROFIBUS-DP Network
Depending on the Transmisson Rate 5-15..............................
5-3 Lengths of Spur Lines per Segment 5-16...............................
5-4 Features of the Fiber-Optic Cables 5-24................................
5-5 Order Numbers - Fiber-Optic Cables 5-26..............................
5-6 Order Numbers - Simplex connectors and connector adapters 5-27........
5-7 Permissible Cable Lengths on the Optical PROFIBUS-DP Network
(Partyline Topology) 5-28.............................................
6-1 Checklist to be Used Before Switching On for the First Time 6-3..........
6-2 Setting the Battery Monitoring Switch 6-5..............................
A-1 Key for Example 1 A-11..............................................
A-2 Cabling Inside Buildings A-17.........................................
A-3 High-Voltage Protection of Cables with the Help
of Surge Protection Equipment A-23...................................
A-4 Low-Voltage Protection Components for
Lightning Protection Zones 1 <--> 2 A-26................................
A-5 Surge Protection Components for Lightning Protection Zones 2 <--> 3 A-27.
A-6 Example of a Circuit Conforming to Lightning Protection Requirements
(Legend to Figure A-7) A-29...........................................

1-1
Automation System S7-400 Hardware and Installation
A5E00850741-01
Product Overview
Overview of the S7-400
The S7-400 is a programmable logic controller. Almost any automation task can be
implemented with a suitable choice of S7-400 components.
S7-400 modules have a block design for swing-mounting in a rack. Expansion
racks are available to extend the system.
In this chapter, we show you the most important components with which you can
assemble an S7-400.
Features of the S7-400
The S7-400 programmable controller combines all the advantages of the previous
system with those of a new system and new software. These are:
•A graded CPU platform
•Upwardly-compatible CPUs
•Enclosed modules of rugged design
•Convenient terminal system for the signal modules
•Compact modules with a high component density
•Optimum communication and networking facilities
•Convenient incorporation of operator interface systems
•Software parameter assignment for all modules
•Extensive choice of slots
•Operation without fans
•Multicomputing in the non-segmented rack
1

Product Overview
1-2 Automation System S7-400 Hardware and Installation
A5E00850741-01
S7-400 components
The most important components of the S7-400 and their functions are given in the
following tables:
Components Function Illustration
Racks
(UR: Universal Rack)
(CR: Central Rack)
(ER: Expansion Rack)
... provide the mechanical and
electrical connections between
the S7-400 modules.
Power Supply Modules
(PS = Power Supply)
Accessories:
Backup battery
... convert the line voltage
(120/230 VAC or 24 VDC) to the
5 VDC and 24 VDC operating
voltages required to power the
S7-400.
CPUs
Central Processing Units (CPUs)
... execute the user program;
communicate via the multipoint
interface (MPI) with other CPUs
or with a programming device
(PG).
Memory cards ... store the user program and
parameters.
IF 964-DP interface module ... used to connect distributed
I/Os via PROFIBUS-DP
Signal Modules
(SM = Signal Module)
(digital input modules, digital
output modules, analog input
modules, analog output modules)
Accessories:
Front connector with three
different terminal systems
... match the different process
signal levels to the S7-400.
... form the interface between
PLC and process.
Interface modules
(IM = Interface Module)
Accessories:
Connecting cable
Terminator
... interconnect the individual
racks of an S7-400.
Cable ducts ...are used for routing cables and
as ventilation.
PROFIBUS bus cables ...connect CPUs to programming
devices.

Product Overview
1-3
Automation System S7-400 Hardware and Installation
A5E00850741-01
Components IllustrationFunction
PG cables ...connect a CPU to a
programming device.
PROFIBUS components
for example, PROFIBUS bus
terminal
... connect the S7-400 to other
S7-400 devices or programming
devices.
RS 485 repeaters ...amplify data signals on bus
lines and links bus segments.
Programming device (PG) or PC
with the STEP 7 software
package
...configures, programs, debugs,
and assigns parameters to the
S7-400.
Fan subassemblies
(for special areas of application)
...ventilates modules in special
cases; can be operated with or
without a filter.
Additional components of the S7-400 such as communications processors, function
modules, etc., are described in separate manuals.
Location of the order number and product version
The order number and product version are printed on every module of the
SIMATIC S7-400. The firmware version is also printed on the CPUs. The following
figure shows their locations on a module.
For the product version, an X is entered instead of the valid number. The following
figure shows a module with Product Version 1.
Product version
Abbreviated order number
(6ES7 ...)
Type label
Module designation
412-1XF04-0AB0
2
34
X
CPU 412-1
Firmware version
(in CPUs)
V4.0

Product Overview
1-4 Automation System S7-400 Hardware and Installation
A5E00850741-01
Example of a rating plate
Order no. Module designation
Approvals and marks
Product version

2-1
Automation System S7-400 Hardware and Installation
A5E00850741-01
Installing the S7-400
Chapter Overview
Section Description Page
2.1 S7-400 Installation 2-2
2.2 Installing the Central Rack (CR) and Expansion Rack (ER) 2-6
2.3 Segmented CR 2-8
2.4 Subdivided CR 2-9
2.5 Mounting and Grounding the Racks 2-10
2.6 Chassis Terminal Connection in the Non-Isolated Configuration 2-16
2.7 Methods of Ventilation 2-18
2.8 Changing the Ventilation with the Cable Duct and Fan Subassembly 2-20
2.9 Installing the Fan Subassembly 2-22
2.10 Installing the Cable Duct 2-24
2.11 Choosing and Setting up Cabinets with the S7-400 2-25
2.12 Rules for the Arrangement of Modules 2-29
2.13 Installing Modules in a Rack 2-30
2.14 Marking the Modules with Slot Labels 2-33
2.15 Methods of Expansion and Networking 2-34
2.16 Accessories 2-35
2

Installing the S7-400
2-2 Automation System S7-400 Hardware and Installation
A5E00850741-01
2.1 S7-400 Installation
Introduction
An S7-400 programmable controller consists of a central rack (CR) and one or
more expansion racks (ERs), as required. You can add ERs to compensate for lack
of slots for your application or operate signal modules at remote locations (e.g. in
the immediate vicinity of your process).
When using ERs, you need interface modules (IMs) as well as the additional racks,
and additional power supply modules if necessary. When using interface modules,
you must always use the appropriate partners: you insert a send IM in the CR, and
the matching receive IM in each connected ER (see Reference Manual,
Chapter 6).
Central Rack (CR) and Expansion Rack (ER)
The rack containing the CPU is known as the central rack (CR). The racks
containing modules in the system and connected to the CR are the expansion
racks (ERs).
Shown in Figure 2-1 is a rack with 18 slots configured as a CR.
PS CPU SMs
Figure 2-1 Rack Fitted with Modules in the S7-400 System

Installing the S7-400
2-3
Automation System S7-400 Hardware and Installation
A5E00850741-01
Connecting the CR and ER(s)
To connect one or more ERs to a CR, you must fit one or more send IMs in the CR.
The send IMs have two interfaces. You can connect one chain of up to four ERs to
each of the two interfaces of a send IM in the CR.
Different IMs are available for local connection and remote connection.
Connecting witha5VSupply
For a local connection with the IM 460-1 and IM 461-1, the 5 V supply voltage is
also transferred via the interface modules. There must therefore be no power
supply module inserted in an ER connected to an IM 460-1/IM 461-1.
Up to 5 A may flow through each of the two interfaces of an IM 460-1. This means
that each ER connected via an IM 460-1/461-1 can be powered with a maximum of
5 A at 5 V. For further details, see the Reference Manual, Chapter 6.
Overview of the Connections
Observe the connection rules at the end of this section.
Local Connection Remote Connection
Send IM 460-0 460-1 460-3 460-4
Receive IM 461-0 461-1 461-3 461-4
Max. number of connectable
EMs per chain 4144
Max. distance 5m 1.5 m 102.25 m 605 m
5 V transfer No Yes No No
Max. current transfer per inter-
face -- 5A -- --
Communication bus transmission Yes No Yes No

Installing the S7-400
2-4 Automation System S7-400 Hardware and Installation
A5E00850741-01
Ways of Connecting Central and Expansion Racks
Central rack CR
Expansion rack ER 1 Expansion rack ER 4
Expansion rack ER 1
Expansion rack ER 1 Expansion rack ER 4
Expansion without 5 V local transfer
Expansion with 5 V local transfer
Remote expansion
IM 460-0
IM 460-1
IM 460-3
Chain length max. 102.25 m
Chain length max. 1.5 m
IM 461-0 IM 461-0
IM 461-1
IM 461-3 IM 461-3
IM 460-4
Expansion rack ER 1 Expansion rack ER 4
Chain length max. 605 m
IM 461-4 IM 461-4
Chain length max. 5 m