Siemens SIMATIC IM 178-4 User Manual

Preface, Contents

SIMATIC

IM 178-4

Manual

This manual is part of the product
with order number:

6ES7 178-4BH00-0AE0

Part 1: User Information

Product Overview
Installing and Removing the

Module

Wiring

Parameter Assignment

Preparing for Startup

Part 2: Reference Section

Functions of the IM 178-4

Diagnostics

1

2
3
4
5

6
7

Appendix

Technical Specifications
Configuration and

Parameter Assignment
Frame for the IM 178-4

Glossary, Index

A

B

Safety Guidelines

This manual contains notices which you should observe to ensure your own personal safety, as well as to
protect the product and connected equipment. These notices are highlighted in the manual by a warning
triangle and are marked as follows according to the level of danger:

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 or property damage can result if proper precautions are not taken.

Note

draws your attention to particularly important information on the product, handling the product, or to a
particular part of the documentation.

Qualified Personnel

Only qualified personnel should be allowed to install and work on this equipment. Qualified persons are
defined as persons who are authorized to commission, to ground, and to tag circuits, equipment, and
systems in accordance with established safety practices and standards.

Correct Usage

Note the following:

Warning

!

Trademarks

This device 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.

SIMA TICR, SIMA TIC HMIR and SIMA TIC NETR 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.

Disclaimer of LiabilityCopyright E Siemens AG 1998 All rights reserved

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

Siemens AG
Bereich Automatisierungs- und Antriebstechnik
Geschaeftsgebiet Industrie Automatisierungssystem
Postfach 4848, D- 90327 Nuernberg

Index-2

Siemens Aktiengesellschaft C79000-G7076-C178

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.

E Siemens AG 1998
Subject to change without prior notice.

C79000-G7076-C178-01

IM 178-4

Preface

Purpose of the Documentation

This manual describes all the steps necessary to use the function module
IM 178-4. It will help you to become familiar with the functions of the IM 178-4
quickly and effectively.

Content of the Manual

This manual describes the hardware and software of the IM 178-4. It deals with the
following topics:

S Product overview
S Installation and removal of the module
S Wiring
S Parameter assignment
S Starting up
S Functions
S Diagnostics
S Appendix

Audience

The manual is intended for the following audience:

S Fitters
S Programmers
S Commissioning engineers
S Service and maintenance personnel

Applicability of the Manual

This manual contains the description of the function module IM 178-4 valid at the
time of publication. We reserve the right to describe modifications in the
functionality of the IM 178-4 in a Product Information leaflet.

IM 178-4
C79000-G7076-C178-01

iii

Preface

Finding Your Way in the Manual

To help you find specific information quickly, the manual includes the following :

S At the start of the manual, you will find a complete table of contents.
S In the Appendix, you will find a glossary in which the most important

terminology used in the manual is explained.

S At the end of the manual, you will find a comprehensive index with which you

can locate topics and specific information quickly.

Other Literature Required

To understand this manual, you should also be familiar with the manual

Distributed I/O System

Standards

The S7-300 programmable controller complies with the standard IEC 1131.

Recycling and Disposal

The SIMATIC S7-300 is an environmentally friendly product!
The SIMATIC S7-300 has the following environmental features:

S Plastic casing highly fireproof despite halogen–free flame protection
S Labeled by laser (in other words no unnecessary labels)
S Plastic materials indicated in compliance with DIN 54840
S Less material used due to small dimensions, less components due to

integration in ASICs
The SIMATIC S7-300 is suitable for recycling due to its low pollutant content .
For environmentally friendly recycling and disposal of your old SIMATIC PLC using

the most modern methods, contact:

ET 200

.

Siemens Aktiengesellschaft
Anlagenbau und Technische Dienstleistungen
ATD TD 3 Kreislaufwirtschaft
Postfach 32 40
D-91050 Erlangen
Germany

Phone: ++49 / 91 31 / 73 36 98
Telefax: ++ 49 / 91 31 / 72 66 43

This Siemens department offers individual counseling and a comprehensive and
flexible disposal system at a fixed price. Following disposal, you receive a
breakdown of the materials and a certification of the materials.

iv

C79000-G7076-C178-01

IM 178-4

CD-ROM

You can also order the entire SIMATIC S7 documentation on a CD-ROM.

Further Support

If you have questions about using the product described in the manual and cannot
find the answer here, please contact your local Siemens representative. You will
find the addresses in the appendix ”SIEMENS Worldwide” in the

Programmable Controller, Hardware and Installation, CPU Data”

If you have questions or comments about the manual itself, please complete the
reply card at the end of the manual and send it to address shown. Please take a
few minutes to give your own personal assessment of the manual on the reply
card.

To familiarize users with the SIMATIC automation systems, we offer a variety of
training courses. If you are interested in these courses, please contact your
Regional Training Center or the Central Training Center in D-90327 Nürnberg,
Germany, Tel. ++49/911/895 3154.

Preface

”S7-300, M7-300

manual

.

The Latest Information

You can always obtain the very latest information about SIMATIC products from
the following sources:

S On the Internet: http://www.aut.siemens.de/
S By calling fax polling no. 08765-93 00 5000

Our SIMATIC Customer Support also supports you with up-to-date information and
downloads, that you may find helpful when using SIMATIC products:

S On the Internet: http://www.aut.siemens.de/simatic–cs
S In the SIMATIC Customer Support Mailbox: number

[phone]
If you connect to the mailbox, use a modem with up to V.34

(28.8 Kbauds), with the following parameter settings:
8, N, 1, ANSI, or dial on ISDN (x.75, 64 Kbps).

SIMATIC Customer Support is available at the following phone and fax numbers or
e–mail addresses. You can also send enquiries by mail on the Internet or by mail to
the mailbox number above.

IM 178-4
C79000-G7076-C178-01

v

Preface

Nuremberg

Johnson City

Singapore

Simatic Basic Hotline

Nuremberg
SIMA TIC BASIC Hotline

Local time: Mo.-Fr . 8:00
to 18:00

Phone: [phone]
Fax: [phone]
E-mail: simatic.support@

nbgm.siemens.de

SIMA TIC Premium Hotline

(charged, only with
SIMA TIC Card)

Time: Mo.-Fr . 0:00 to 24:00
Phone: [phone]
Fax: [phone]

Johnson City
SIMA TIC BASIC Hotline

Local time: Mo.-Fr . 8:00
to 17:00

Phone: [phone]
Fax: [phone]
E-mail: simatic.hotline@

sea.siemens.com

Singapore
SIMA TIC BASIC Hotline

Local time: Mo.-Fr . 8:30
to 17:30

Phone: [phone]
Fax: [phone]
E-mail: simatic@

singnet.com.sg

vi

C79000-G7076-C178-01

IM 178-4

Contents

1 Product Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 What Can the IM 178-4 Do? 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Fields of Application of the IM 178-4 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 The Hardware of the IM 178-4 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Installing and Removing the Module 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Wiring 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Pinout of the Front Connector 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Description of the Individual Pins (Notes, Explanations) 3-4. . . . . . . . . . . . . . .

3.3 Wiring the Front Connector 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Wiring and Connecting the Bus Connector 3-8. . . . . . . . . . . . . . . . . . . . . . . . . .

4 Parameter Assignment 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 Methods of Assigning Parameters to the IM 178-4 4-1. . . . . . . . . . . . . . . . . . .

4.2 GSx File 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 Preparing for Startup 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1 Setting the PROFIBUS Address of the IM 178-4 5-1. . . . . . . . . . . . . . . . . . . . .

5.2 Checklist of the Mechanical Construction 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . .

5.3 Checklist for Configuration/Parameter Assignment 5-3. . . . . . . . . . . . . . . . . . .

6 Functions of the IM 178-4 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1 Description of the Functions 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.1 Cyclic Processing 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1.2 Error Monitoring 6-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2 User Data Interface 6-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 Diagnostics 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7.1 Status and Diagnostic LEDs 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7.2 Diagnostic Data of the IM 178-4 7-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7.2.1 Structure of Slave Diagnostics 7-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7.2.2 Structure of the First 6 Bytes of the Slave Diagnostic Data 7-4. . . . . . . . . . . .

7.2.3 Structure of the ID-Related and Device-Related Slave Diagnostic Data 7-6.

IM 178-4
C79000-G7076-C178-01

vii

Contents

A Technical Specifications A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A.1 Technical Data of the IM 178-4 A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B Configuration and Parameter Assignment Frame for the IM 178-4 B-1. . . . . . . . . .

B.1 Structure of the Configuration Frame B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B.2 Structure of the Parameter Assignment Frame B-2. . . . . . . . . . . . . . . . . . . . . .

B.2.1 Standard Section of the Parameter Assignment Frame B-2. . . . . . . . . . . . . . .

B.2.2 Parameters for the DP Attachment B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B.2.3 Technological Parameters B-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

viii

C79000-G7076-C178-01

IM 178-4

Product Overview

Order Number

The product has the order number: 6ES7 178-4BH00-0AE0

Components of the product

1 Module
1 CD ROM with the following content:

S the readme.wri, liesmich.wri, lisezmoi.wri, leggimi.wri and leame.wri files
S the Englisch, German, French and Italian manual for the IM 178-4

(IM178_E.PDF, IM178_D.PDF, IM178-4_F.PDF, IM178-4_I.PDF)

S Device database:

– German: SIEM8064.GSG
– English: SIEM8064.GSE
– French: SIEM8064.GSF

1

– Italian: SIEM8064.GSI

S the bitmap files IM178__N.BMP and IM178__S.BMP
S Acrobat Reader

IM 178-4
C79000-G7076-C178-01

1-1

Product Overview

1.1 What Can the IM 178-4 Do?

What Can the IM 178-4 Do?

The IM 178-4 is a DP slave with a fixed number of I/Os and has the same design
as S7-300 modules. It has two technologically identical but independent channels
for position detection of incremental position encoders and/or SSI position
encoders and for controlling analog drives ("10 V). The module is attached to the
DP network via a 9 pin sub-D male connector.

Per channel, the module has the following:
S One input for position detection with SSI position encoders or incremental

encoders with 5 V differential signals

S One analog output "10 V
S 3 digital inputs (2 with fixed functions)
S 3 digital outputs that you can use as required.

1.2 Fields of Application of the IM 178-4

Where can you use the IM 178-4?

The IM 178-4 is required mainly by users who want to create distributed position
detection and positioning systems in conjunction with conventional drives with an
analog interface ("10 V) and conventional displacement measuring systems (SSI,
incremental position encoders with 5V differential signals). The technological
functionality is no longer in the individual positioning modules as previously but in a
powerful centralized controller.

1-2

C79000-G7076-C178-01

IM 178-4

1.3 The Hardware of the IM 178-4

Module Overview

The following diagram shows the IM 178-4 module with its front connector.

Diagnostic LEDs

Product Overview

Front Connector

Type Label

Labeling Strip

Figure 1-1 The IM 178-4 Module

Front Connector

With the IM 178-4, the following attachments are possible via the front connector:
S 2 inputs for position detection with SSI position encoders or incremental

position encoders with 5 V differential signals

S 6 digital inputs
S 6 digital outputs
S 2 analog outputs "10 V
S Power supply 1L+
S Load voltage 2L+

The front connector must be ordered separately (order number
6ES7 392-1AM00-0AA0

Order Number

Version

IM 178-4
C79000-G7076-C178-01

1-3

Product Overview

Labeling Strip

The module has a labeling strip on the right front panel that you can label with your
signal names.

The inner side of the right front panel has the pinout of the IM 178-4.

Order Number and Version

The order number and version are shown at the bottom of the front panel.

Status and Diagnostics LEDs

Labeling Color Function

SF red Group error (technology)

BF red Bus error
ON green Operating display
0I0 green Digital input 0 of channel 0
0I1 green Digital input 1 of channel 0
0I2 green Digital input 2 of channel 0

0Q0 green Digital output 0 of channel 0
0Q1 green Digital output 1 of channel 0
0Q2 green Digital output 2 of channel 0

1I0 green Digital input 0 of channel 1
1I1 green Digital input 1 of channel 1
1I2 green Digital input 2 of channel 1

1Q0 green Digital output 0 of channel 1
1Q1 green Digital output 1 of channel 1
1Q2 green Digital output 2 of channel 1

1-4

C79000-G7076-C178-01

IM 178-4

Installing and Removing the Module

Selecting the Location

A horizontal installation is preferable. If you install the module vertically, remember
that the ambient temperature is restricted (max. 40 _C).

Important Safety Rules

For modules in the S7-300 design, there are important rules that must be kept to.
These rules and regulations are explained in the manual

Controller, Hardware and Installation, CPU Data

Rules

When installing the IM 178-4, no particular measures are necessary regarding
electrostatic discharge (ESD).

Required Tools

.

2

S7-300 Programmable

Installation

To install or remove the IM 178-4, you require a 4.5 mm screwdriver.

To install the IM 178-4 on a rail, follow the steps outlined below. For further
information about installing modules, refer to the manual

Controller, Hardware and Installation, CPU Data

1. Hook the IM 178-4 on to the rail and push in the bottom section of the module.

2. Screw the IM 178-4 tight (torque approximately 0.8 to 1.1 Nm).

3. Plug in the front connector and screw it tight.

4. Fit the shield contact element.
The order number of the shield contact element is 6ES7 390-5AA00-0AA0.

5. Plug in the bus connector.
The order number of the bus connector is 6ES7 972-0BA10-0XA0 or

6ES7 972-0BB10-0XA0.

.

S7-300 Programmable

IM 178-4
C79000-G7076-C178-01

2-1

Installing and Removing the Module

Removing/Replacing the Module

To remove the IM 178-4, follow the steps outlined below. For further information
about removing modules, refer to the manual

Hardware and Installation, CPU Data

1. Turn off the auxiliary voltage and the load voltage at the front connector.

2. Open the front panel. If you require it, remove the label from inside the panel.

3. Release the mounting screw on the front connector and remove the connector.

4. Unplug the bus connector.

Note

If the LAN cable is connected through, you can remove the bus connector from the
DP interface without interrupting the data exchange on the bus.

5. Release the mounting screw on the module.

S7-300 Programmable Controller,

6. Pull out the bottom of the module from the rail and remove it upwards.

7. If required, install the new module.

2-2

C79000-G7076-C178-01

IM 178-4

Wiring

3.1 Pinout of the Front Connector

Front connector

You connect the position encoders, the analog outputs, the digital inputs and
outputs, the sensor power supply and the module voltage via the 40-pin front
connector.

Figure 3-1 shows the front of the module, the front connector and the inner side of
the front panel with the pinout plan.

3

Front connectorFront view of the module Inside the front panel

Figure 3-1 Front Connector of the IM 178-4

1
2
3

4
5
6
7
8

9
0

1

1

1

2

1

3

1

4

1

5

1

6

1

7

1

8

1

9

1

0

2

1

2

2

2
2

3
4

2

5

2

6

2

7

2
2

8

2

9
0

3

3

1

3

2

3

3

3

4

3

5

3

6

3

7

3

8

3

9

4

0

3

IM 178-4
C79000-G7076-C178-01

3-1

Wiring

Pinout of the Front Connector

Table 3-1 Pinout of the Front Connector

Pin

1 M OUT – Sensor power supply ground
2 5.2 V DC OUT – 5 V sensor power supply
3 24 V DC OUT – 24 V sensor power supply
4 0A/SDI IN – Channel 0 count signal A / serial data input
5 0A/SDI IN – Channel 0 count signal A / serial data input, inverted
6 0B IN – Channel 0 count signal B
7 0B IN – Channel 0 count signal B, inverted
8 0N IN – Channel 0 zero mark
9 0N IN – Channel 0 zero mark, inverted
10 0CLS OUT – Channel 0 shift clock CLS
11 0CLS OUT – Channel 0 shift clock CLS, inverted
12 1A/SDI IN – Channel 1 count signal A / serial data input
13 1A/SDI IN – Channel 1 count signal A / serial data input, inverted
14 1B IN – Channel 1 count signal B
15 1B IN – Channel 1 count signal B inverted
16 1N IN – Channel 1 zero mark
17 1N IN – Channel 1 zero mark, inverted
18 1CLS OUT – Channel 1 shift clock CLS
19 1CLS OUT – Channel 1 shift clock CLS, inverted
20 –
21 1L+ IN – Auxiliary voltage 1L+
22 M IN – Auxiliary voltage ground
23 0AO OUT – Analog output 0AO
24 0BS OUT – Reference signal 0BS
25 1AO OUT – Analog output 1AO
26 1BS OUT – Reference signal 1BS
27 0I0 IN green Digital input 0I0
28 0I1 IN green Digital input 0I1
29 0I2 IN green Digital input 0I2
30 0Q0 OUT green Digital output 0Q0
31 0Q1 OUT green Digital output 0Q1
32 0Q2 OUT green Digital output 0Q2
33 1I0 IN green Digital input 1I0

Name Input/

Output

LED Function

3-2

C79000-G7076-C178-01

IM 178-4

Table 3-1 Pinout of the Front Connector

Wiring

Pin FunctionLEDInput/

34 1I1 IN green Digital input 1I1
35 1I2 IN green Digital input 1I2
36 1Q0 OUT green Digital output 1Q0
37 1Q1 OUT green Digital output 1Q1
38 1Q2 OUT green Digital output 1Q2
39 2L+ IN – Load voltage 2L+
40 2M IN – Load voltage ground

Name

Output

Note

If you supply the sensor with an external voltage, connect the ground of the
external voltage to the ground of the module (terminal 1 or 22).

IM 178-4
C79000-G7076-C178-01

3-3

Wiring

3.2 Description of the Individual Pins (Notes, Explanations)

24 V Power Supply

For the power supplies of the IM 178-4, connect a DC voltage of 24 V to pins 1L+
and M and 2L+ and 2M.

Caution

!

Make sure that the polarity of the 24 V power supply is correct otherwise the
module will be damaged.

The 24 V power supply must meet the following requirements:
Only an extra-low DC voltage of ≤ 60 V that is safely isolated from the main power

supply must be used as the 24 V power supply. Safe isolation of the power supply
can be achieved by adhering to the requirements of VDE 0100 Part 410 / HD
384-4-41 / IEC 364-4-41 (as functional extra-low voltage with safe isolation) or
VDE 0805 / EN 60950 / IEC 950 (as safety extra-low voltage SELV) or VDE 0106
Part 101.

5.2 V and 24 V Sensor Power Supplies

From the 24 V power supply 1L+/M, the module generates a voltage of 5.2 V. This
voltage is applied to DC5.2V (pin 2) as a short-circuit proof power supply for the
sensors and can accept a maximum load of 600 mA. The ground of the sensor
power supply is connected to M (Pin 1).

For sensors that require a power supply of 24 V, the short-circuit protected
auxiliary voltage is available at DC24V (Pin 3).

Note

A short-circuit of the 5.2 V sensor power supplies leads to a failure of the module.

Sensor Pins

Per channel, you can connect two different sensor types using shielded cables, as
follows:

S Incremental sensors complying with RS 422:

The signals A, A, B, B and N, N are connected via the correspondingly labeled
pins.

3-4

S SSI position encoders:

The signals SDI, SDI and CLS, CLS are connected to the correspondingly
labeled pins.

C79000-G7076-C178-01

IM 178-4

Digital Inputs I0 to I2

Per channel, the IM 178-4 has three digital inputs. These are operated with a rated
voltage of 24 V.

The digital inputs are electrically isolated from the DP interface and the sensor
signals.

The digital inputs I0 and I1 have fixed functions depending on the parameter
assignment (see Chapter 6). Pin I0 must be connected using a shielded cable.

Digital Outputs Q0 to Q2

Per channel, the IM 178-4 has three digital outputs. These are supplied from the
24 V power supply 2L+.

The digital outputs are electrically isolated from the DP interface and the sensor
signals.

The digital outputs are current–sourcing switches and can accept a load current of

0.5 A. They are protected against overload and short–circuits.

Wiring

Note

The direct connection of relays and contactors is possible without external
protective circuits.

Analog Outputs

Per channel, the IM 178-4 has one analog output of ±10 V with a resolution of ±13
bits.

The analog outputs must be connected using shielded cables.

Note

Turning on the auxiliary voltage 1L+ can lead to the analog outputs supplying a
spurious pulse for several ms. This spurious pulse must not cause the power
circuits to be activated. This must be avoided by appropriate external wiring of the
module (digital output to enable the power circuits).

IM 178-4
C79000-G7076-C178-01

3-5

Wiring

3.3 Wiring the Front Connector

Cables

When selecting suitable cables, follow the rules outlined below:

S The cables for digital inputs 0I0 and 1I0 must be shielded.
S The cables for the position encoder signals must be shielded; the pairs of cores

must be twisted.

S The shields of the cables for the count signals must be connected to ground

both at the position encoder and in the immediate vicinity of the module, for
example using the shield contact element.

S Use flexible cables with cross–sections of 0.25 to 1.5 mm2.
S The cables for the analog outputs must be shielded.

Note

If the sensor is supplied with power from the module, the conductor cross-section
must be large enough so that the required voltage is applied to the sensor despite
the voltage drop along the cable.

S A wire-end ferrule is not required. If you use wire-end ferrules, use only those

without an insulation collar according to DIN 46228 form A, short version!

Tools Required

A 3.5 mm screwdriver.

3-6

C79000-G7076-C178-01

IM 178-4

Wiring Procedure

When wiring the front connector, follow the steps outlined below:

Warning

!

Risk of personal injury.
If you wire the front connector of the IM 178-4 with the power supply on, you may

be injured by the electrical current.
Make sure that you wire the IM 178-4 only when the power supply is turned off.

1. Open the front panel and bring the front connector into a position so that you
can wire it.

2. Strip the insulation from the wires (remove 6 mm of the insulation).

3. Are you using wire–end ferrules?
If yes: Crimp the wire-end ferrules onto the wires.

Wiring

4. Thread the accompanying strain relief into the front connector.

5. If the wires are led out towards the bottom, start wiring from the bottom,
otherwise from the top. You should also screw down terminals that are not in
use (tightening torque 0.6 to 0.8 Nm).

6. Pull the strain relief for the cables tight.

7. Screw the front connector into the operating position.

8. Establish contact between the shields of the cables on the shield contact
element or on the shield contact rail.

9. Enter the terminal assignments on the pinout plan.

Figure 3-2 shows the IM 178-4 with shielded cables and a shield contact element.

IM 178-4
C79000-G7076-C178-01

3-7

Wiring

Figure 3-2 Connecting Shielded Cables to the IM 178-4

Note

For a detailed description of wiring the front connector, refer to the manual

Programmable Controller, Hardware and Installation, CPU Data

3.4 Wiring and Connecting the Bus Connector

LAN Cable

As the LAN cable, use the PROFIBUS shielded twisted pair cable or fiber-optic
cable. For ordering information, refer to the Catalog

Cable Lengths

For information about the length of the LAN cable in a segment and about
interconnecting segments, refer to the manuals describing the DP master.

The cable lengths specified in these manuals are only guaranteed for the
PROFIBUS cable (see Catalog

ST 70

).

ST 70

S7-300

.

.

3-8

C79000-G7076-C178-01

IM 178-4

Attaching the LAN Cable

Connect the LAN cable to the bus connector with order numbers
6ES7 972-0BA10-0XA0 or 6ES7 972-0BB10-0XA0 ... as follows:

1. Strip the insulation from the LAN cable as shown in Figure 3-3.

6XV1 830–0AH10/-3BH10 6XV1 830–3AH10

Wiring

7,5 9

6

Figure 3-3 Lengths for Stripping Insulation for the Bus Connector (6ES7 972-0B?0-0XA0)

120

7,5 9

6

2. Open the casing of the bus connector by undoing the casing screws and
removing the cover.

3. Fit the green and red wire in to the screw terminal block as shown in Figure 3-4.
Make sure that you always connect the same wire to the same terminal A or B

(for example terminal A is always wired with the green wire and terminal B
always with the red wire).

4. Press the cable jacket between the two clamping posts. This fixes the cable in
place.

5. Screw the green and red wire into the terminal block.

LAN cable connection for first and
last node in the segment

1

LAN cable connection for all
other nodes in the segment

1

: The LAN cable can be connected to the right or left terminals!

Figure 3-4 Connecting the LAN Cable to the Bus Connector (6ES7 972-0B?10 0XA0)

6. Screw the casing back together.
Make sure that the cable shield makes contact with the shield clamp.

IM 178-4
C79000-G7076-C178-01

A B A B A B A B

3-9

Wiring

Connecting the Bus Connector

To connect the bus connector, follow the steps outlined below:

1. Plug the bus connector on to the IM 178-4.

2. Secure the bus connector on the IM 178-4 with the screws.

3. If the bus connector is at the start or end of a segment, the terminating resistor
must be activated (switch setting ”ON”) (see Figure 3-5).

Make sure that the nodes on which the terminating resistor is activated are always
supplied with voltage during startup and operation.

Terminating
resistor
activated

on
off

Terminating
resistor not
activated

on
off

Figure 3-5 Bus connector (6ES7 972-0B?10-0XA0): Terminating resistor activated and

deactivated

3-10

C79000-G7076-C178-01

IM 178-4