Omron SRT2, CQM1-SRM21-V1, SRT1, CS1W-SRM21, COMPOBUS-S OPERATION MANUAL

CompoBus/S

Cat. No. W266-E1-09

C200HW-SRM21-V1
CS1W-SRM21
CJ1W-SRM21
CQM1-SRM21-V1
SRT1 Series
SRT2 Series

OPERATION MANUAL

C200HW-SRM21-V1
CS1W-SRM21
CJ1W-SRM21
CQM1-SRM21-V1
SRT1 Series
SRT2 Series

CompoBus/S

Operation Manual

Revised August 2007

Notice:

r
f

OMRON products are manufactured for use according to proper procedures by a qualified operator
and only for the purposes described in this manual.

The following conventions are used to indicate and classify precautions in this manual. Always heed
the information provided with them. Failure to heed precautions can result in injury to people or dam­age to property.

!DANGER Indicates an imminently hazardous situation which, if not avoided, will result in death or

serious injury. Additionally, there may be severe property damage.

!WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death or

serious injury. Additionally, there may be severe property damage.

!Caution Indicates a potentially hazardous situation which, if not avoided, may result in minor or

moderate injury, or property damage.

OMRON Product References

All OMRON products are capitalized in this manual. The word “Unit” is also capitalized when it refers to
an OMRON product, regardless of whether or not it appears in the proper name of the product.

The abbreviation “Ch,” which appears in some displays and on some OMRON products, often means
“word” and is abbreviated “Wd” in documentation in this sense.

The abbreviation “PLC” means Programmable Controller and is not used as an abbreviation for any­thing else.

Visual Aids

The following headings appear in the left column of the manual to help you locate different types of
information.

 OMRON, 1996

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form, o
by any means, mechanical, electronic, photocopying, recording, or otherwise, without the prior written permission o
OMRON.

No patent liability is assumed with respect to the use of the information contained herein. Moreover, because OMRON is con­stantly striving to improve its high-quality products, the information contained in this manual is subject to change without
notice. Every precaution has been taken in the preparation of this manual. Nevertheless, OMRON assumes no responsibility
for errors or omissions. Neither is any liability assumed for damages resulting from the use of the information contained in
this publication.

Note Indicates information of particular interest for efficient and convenient opera-

tion of the product.

1,2,3... 1. Indicates lists of one sort or another, such as procedures, checklists, etc.

v

TABLE OF CONTENTS

PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv

1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi

2 General Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi

3 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi

4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii

5 Application Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

6 Conformance to EC Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi

SECTION 1

System Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1-1 System Overview and Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1-2 CompoBus/S System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1-3 Compatible Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1-4 Startup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

SECTION 2
CompoBus/S System Specifications and Configuration 23

2-1 Communications Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2-2 System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2-3 Supplying Power to the Slaves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

2-4 System Configuration Using Water-resistant Terminals . . . . . . . . . . . . . . . . . . . . . 41

2-5 I/O Response Time Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

SECTION 3

CompoBus/S System Wiring . . . . . . . . . . . . . . . . . . . . . . 53

3-1 Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

3-2 Connector Installation (Special Flat Cable Only). . . . . . . . . . . . . . . . . . . . . . . . . . 55

3-3 VCTF Cable Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

3-4 Master/Slave Connecting Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

3-5 Operations Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

SECTION 4

Master Unit Specifications and Operations . . . . . . . . . . 73

4-1 C200HW-SRM21-V1 Master Unit for CS-series,

C200HX/C200HG/C200HE-(Z)E, and C200HS PLCs . . . . . . . . . . . . . . . . . . . . . 74

4-2 CS1W-SRM21 Master Unit for CS-series PLCs . . . . . . . . . . . . . . . . . . . . . . . . . . 88

4-3 CJ1W-SRM21 Master Unit for CJ-series PLCs . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

4-4 CQM1-SRM21-V1 Master Unit for CQM1 PLCs . . . . . . . . . . . . . . . . . . . . . . . . . 126

4-5 SRM1-C0@-V2 Master Control Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

4-6 CPM2C-S Series CPM2C-S@@@C (-DRT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

vii

TABLE OF CONTENTS

SECTION 5

Slave Specifications and Operations . . . . . . . . . . . . . . . . 145

5-1 Remote Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

5-2 Connector Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

5-3 Remote I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

5-4 Water-resistant Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268

5-5 Sensor Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

5-6 Fiber Amplifier Communications Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

5-7 Analog Input Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

5-8 Analog Output Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318

5-9 I/O Link Units for CPM1A and CPM2A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327

5-10 I/O Link Units for CPM2C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331

5-11 Sensor Amplifier Terminals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335

5-12 Application Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350

SECTION 6

Starting Communications. . . . . . . . . . . . . . . . . . . . . . . . . 353

6-1 Turning the Power ON. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354

6-2 Checking Operations for CS-series, C200HX/C200HG/C200HE-(Z)E,

and C200HS Master Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356

6-3 Checking Operations of CS-series and CJ-series Master Units. . . . . . . . . . . . . . . 365

6-4 Checking Operations of CQM1 Master Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377

6-5 Checking Slave Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 382

6-6 Cleaning and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 384

6-7 Precautions for Replacement of Units or Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 385

Appendix

Standard Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395

Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401

viii

About this Manual:

This manual describes the installation and operation of the CompoBus/S system and includes the sec­tions described below.

Please read this manual carefully and be sure you understand the information provided before
attempting to install and operate the CompoBus/S Master and Slave Units. Be sure to read the pre-

cautions provided in the following section.

Section 1 provides an overview of the CompoBus/S System and functions, and describes the various
Units that are used to configure a CompoBus/S System.

Section 2 provides details on the CompoBus/S System specifications and I/O response times, and
explains how to configure a CompoBus/S System.

Section 3 explains how to install Units in control panels, wire the signal and power lines, and make
other connections needed to assemble a CompoBus/S System. We recommend reading through the
information on wiring each Master and Slave that are provided in Section 4 and Section 5.

Section 4 explains the functions of each Master Unit, including information on specifications, switch
settings and allocation of Slave I/O.

Section 5 explains the functions of each Slave, including information on specifications, switch settings,
and I/O.

Section 6 provides information on error processing, periodic maintenance operations, and trouble­shooting procedures needed to keep the CompoBus/S System operating properly. We recommend
reading through the error processing procedures before operation so that operating errors can be iden­tified and corrected more quickly.

The Appendix provides tables of standard models including Masters, Slaves, and connecting devices.

In this manual, only the specifications of the CompoBus/S system and devices are described. For
details on Units, refer to their respective manuals. (Suffixes have been omitted from the catalog num­bers.)

Product Name Series Manual Name Cat. No.

CS-series Programmable Controllers CS Series SYSMAC CS Series Operation

CJ-series Programmable Controllers CJ Series SYSMAC CJ Series Operation

CS/CJ-series Programmable Control­lers

C200HX/C200HG/C200HE-(Z)E Pro­grammable Controllers

C200HX/C200HG/C200HE-(Z)E Pro­grammable Controllers

C200HS Programmable Controllers C200HS SYSMAC C200HS Operation

C200HS Programmable Controllers C200HS SYSMAC C200HS Installation

CQM1H Programmable Controller CQM1H SYSMAC CQM1H Operation

CQM1H Programmable Controller CQM1H SYSMAC CQM1H Programming

Manual

Manual

CS/CJ Series SYSMAC CS/CJ Series Pro-

gramming Manual

C200HX/C200HG/
C200HE-(Z)E

C200HX/C200HG/
C200HE-(Z)E

SYSMAC C200HX/C200HG/
C200HE-(Z)E Programmable
Controllers Installation Guide

SYSMAC C200HX/C200HG/
C200HE-(Z)E Programmable
Controllers Operation Manual

Manual

Guide

Manual

Manual

W339

W393

W394

W302

W322

W235

W236

W363

W364

CQM1 Programmable Controller CQM1 SYSMAC CQM1 Operation Man-

ual

W226

ix

Product Name Series Manual Name Cat. No.

CQM1/CPM1/CPM1A/SRM1 Pro­grammable Controller

CompoBus/S SRM1 Master Control
Unit

CPM2C-S Programmable Controller CPM2C-S SYSMAC CPM2C-S Programma-

CPM1A/CPM2A I/O Link Unit CPM1A-SRT21 SYSMAC CPM2A I/O Link Units

CPM2C I/O Link Unit CPM2C-SRT21 SYSMAC CPM2C I/O Link Units

CQM1/CPM1/
CPM1A/SRM1

SRM1(-V2) SYSMAC CompoBus/S SRM1

SYSMAC CQM1/CPM1/CPM1A/
SRM1 Programming Manual

Master Control Units Operation
Manual

ble Controllers Operation Manual

Operation Manual

Operation Manual

W228

W318

W377

W352

W356

!WARNING Failure to read and understand the information provided in this manual may result in per-

sonal injury or death, damage to the product, or product failure. Please read each section
in its entirety and be sure you understand the information provided in the section and
related sections before attempting any of the procedures or operations given.

x

Read and Understand this Manual

Please read and understand this manual before using the product. Please consult your OMRON
representative if you have any questions or comments.

Warranty and Limitations of Liability

WARRANTY

OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a
period of one year (or other period if specified) from date of sale by OMRON.

OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON­INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR PARTICULAR PURPOSE OF THE
PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES THAT THE BUYER OR USER ALONE HAS
DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR
INTENDED USE. OMRON DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED.

LIMITATIONS OF LIABILITY

OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES,
LOSS OF PROFITS OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS,
WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT
LIABILITY.

In no event shall the responsibility of OMRON for any act exceed the individual price of the product on which
liability is asserted.

IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS
REGARDING THE PRODUCTS UNLESS OMRON'S ANALYSIS CONFIRMS THAT THE PRODUCTS
WERE PROPERLY HANDLED, STORED, INSTALLED, AND MAINTAINED AND NOT SUBJECT TO
CONTAMINATION, ABUSE, MISUSE, OR INAPPROPRIATE MODIFICATION OR REPAIR.

xi

Application Considerations

SUITABILITY FOR USE

OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the
combination of products in the customer's application or use of the products.

At the customer's request, OMRON will provide applicable third party certification documents identifying
ratings and limitations of use that apply to the products. This information by itself is not sufficient for a
complete determination of the suitability of the products in combination with the end product, machine,
system, or other application or use.

The following are some examples of applications for which particular attention must be given. This is not
intended to be an exhaustive list of all possible uses of the products, nor is it intended to imply that the uses
listed may be suitable for the products:

• Outdoor use, uses involving potential chemical contamination or electrical interference, or conditions or
uses not described in this manual.

• Nuclear energy control systems, combustion systems, railroad systems, aviation systems, medical
equipment, amusement machines, vehicles, safety equipment, and installations subject to separate
industry or government regulations.

• Systems, machines, and equipment that could present a risk to life or property.

Please know and observe all prohibitions of use applicable to the products.

NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR
PROPERTY WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO
ADDRESS THE RISKS, AND THAT THE OMRON PRODUCTS ARE PROPERLY RATED AND INSTALLED
FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.

PROGRAMMABLE PRODUCTS

OMRON shall not be responsible for the user's programming of a programmable product, or any
consequence thereof.

xii

Disclaimers

CHANGE IN SPECIFICATIONS

Product specifications and accessories may be changed at any time based on improvements and other
reasons.

It is our practice to change model numbers when published ratings or features are changed, or when
significant construction changes are made. However, some specifications of the products may be changed
without any notice. When in doubt, special model numbers may be assigned to fix or establish key
specifications for your application on your request. Please consult with your OMRON representative at any
time to confirm actual specifications of purchased products.

DIMENSIONS AND WEIGHTS

Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when
tolerances are shown.

PERFORMANCE DATA

Performance data given in this manual is provided as a guide for the user in determining suitability and does
not constitute a warranty. It may represent the result of OMRON's test conditions, and the users must
correlate it to actual application requirements. Actual performance is subject to the OMRON Warranty and
Limitations of Liability.

ERRORS AND OMISSIONS

The information in this manual has been carefully checked and is believed to be accurate; however, no
responsibility is assumed for clerical, typographical, or proofreading errors, or omissions.

xiii

PRECAUTIONS

This section provides general precautions for using the CompoBus/S Units, Programmable Controllers, and related devices.

The information contained in this section is important for the safe and reliable application of the CompoBus/S and
PLC. You must read this section and understand the information contained before attempting to set up or operate
a CompoBus/S and PLC system.

1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi

2 General Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi

3 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi

4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii

5 Application Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

6 Conformance to EC Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi

6-1 Applicable Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi

6-2 Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi

6-3 Conformance to EC Directives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi

xv

Intended Audience 1

1 Intended Audience

This manual is intended for the following personnel, who must also have
knowledge of electrical systems (an electrical engineer or the equivalent).

• Personnel in charge of installing FA systems.

• Personnel in charge of designing FA systems.

• Personnel in charge of managing FA systems and facilities.

2 General Precautions

The user must operate the product according to the performance specifica­tions described in the operation manuals.

Before using the product under conditions which are not described in the
manual or applying the product to nuclear control systems, railroad systems,
aviation systems, vehicles, combustion systems, medical equipment, amuse­ment machines, safety equipment, and other systems, machines, and equip­ment that may have a serious influence on lives and property if used
improperly, consult your OMRON representative.

Make sure that the ratings and performance characteristics of the product are
sufficient for the systems, machines, and equipment, and be sure to provide
the systems, machines, and equipment with double safety mechanisms.

This manual provides information for installing and operating OMRON Com­poBus/S Units. Be sure to read this manual before operation and keep this
manual close at hand for reference during operation.

!WARNING It is extremely important that a PLC and all PLC Units be used for the speci-

fied purpose and under the specified conditions, especially in applications that
can directly or indirectly affect human life. You must consult with your OMRON
representative before applying a PLC System to the above-mentioned appli­cations.

3 Safety Precautions

!WARNING Do not attempt to take any Unit apart while the power is being supplied. Doing

so may result in electric shock.

!WARNING Do not touch any of the terminals or terminal blocks while the power is being

supplied. Doing so may result in electric shock.

!WARNING Provide safety measures in external circuits, i.e., not in the Programmable

Controller (CPU Unit including associated Units; referred to as “PLC”), in
order to ensure safety in the system if an abnormality occurs due to malfunc­tion of the PLC or another external factor affecting the PLC operation. Not
doing so may result in serious accidents.

• Emergency stop circuits, interlock circuits, limit circuits, and similar safety
measures must be provided in external control circuits.

• The PLC will turn OFF all outputs when its self-diagnosis function detects
any error or when a severe failure alarm (FALS) instruction is executed.
As a countermeasure for such errors, external safety measures must be
provided to ensure safety in the system.

xvi

Operating Environment Precautions 4

• The PLC outputs may remain ON or OFF due to deposition or burning of
the output relays or destruction of the output transistors. As a counter­measure for such problems, external safety measures must be provided
to ensure safety in the system.

• When the 24-VDC output (service power supply to the PLC) is overloaded
or short-circuited, the voltage may drop and result in the outputs being
turned OFF. As a countermeasure for such problems, external safety
measures must be provided to ensure safety in the system.

!WARNING Do not attempt to disassemble, repair, or modify any Units. Any attempt to do

so may result in malfunction, fire, or electric shock.

!Caution Execute online edit only after confirming that no adverse effects will be

caused by extending the cycle time. Otherwise, the input signals may not be
readable.

!Caution Confirm safety at the destination node before transferring a program to

another node or editing the I/O area. Doing either of these without confirming
safety may result in injury.

!Caution Tighten the screws on the terminal block of the AC Power Supply Unit to the

torque specified in the operation manual. The loose screws may result in
burning or malfunction.

4 Operating Environment Precautions

!Caution Do not operate the control system in the following places:

• Locations subject to direct sunlight

• Locations subject to temperatures or humidity outside the range specified
in the specifications

• Locations subject to condensation as the result of severe changes in tem­perature

• Locations subject to corrosive or flammable gases

• Locations subject to dust (especially iron dust) or salts

• Locations subject to exposure to water, oil, or chemicals

• Locations subject to shock or vibration

!Caution Take appropriate and sufficient countermeasures when installing systems in

the following locations:

• Locations subject to static electricity or other forms of noise

• Locations subject to strong electromagnetic fields

• Locations subject to possible exposure to radioactivity

• Locations close to power supplies

xvii

Application Precautions 5

!Caution The operating environment of the PLC System can have a large effect on the

longevity and reliability of the system. Improper operating environments can
lead to malfunction, failure, and other unforeseeable problems with the PLC
System. Be sure that the operating environment is within the specified condi­tions at installation and remains within the specified conditions during the life
of the system.

5 Application Precautions

Observe the following precautions when using the CompoBus/S Units or the
PLC.

!WARNING Failure to abide by the following precautions could lead to serious or possibly

fatal injury. Always heed these precautions.

• Always connect to 100
to a ground of 100

• Always turn OFF the power supplies to the PLC, slaves, and communica­tions before attempting any of the following. Not turning OFF the power
supplies may result in malfunction or electric shock.

• Mounting or dismounting Power Supply Units, I/O Units, CPU Units,
memory casettes, Master Units, or any other Units

• Mounting or dismounting circuits for Remote I/O Terminals with 3-tier
terminal blocks

• Assembling the Units or Racks

• Setting DIP switches or rotary switches

• Connecting or wiring the cables

• Connecting or disconnecting the connectors

!Caution Failure to abide by the following precautions could lead to faulty operation or

the PLC or the system or could damage the PLC or PLC Units. Always heed
these precautions.

• Failsafe measures must be taken by the customer to ensure safety in the
event of incorrect, missing, or abnormal signals caused by broken signal
lines, momentary power interruptions, or other causes.

• Provide external interlock circuits, limit circuits, and other safety circuits in
addition to any provided within the PLC to ensure safety.

• Configure the control circuits to turn ON the power supply to I/O slaves
before turning ON the power supply to the PLC (Master Unit). If the I/O
slave power supply is turned ON after the PLC, correct operation may
temporarily not be possible.

• Do not attempt to disassemble, repair, or modify any Units. Any attempt to
do so may result in malfunction, fire, or electric shock.

• Do not drop the Unit or subject it to excessive vibration or shock.

• Be sure that all the Backplane mounting screws, slave mounting screws,
terminal screws, and cable connector screws are tightened to the torque
specified in the relevant manuals. Incorrect tightening torque may result in
malfunction.

• Wire correctly according to specified procedures.

Ω or less when installing the Units. Not connecting

Ω or less may result in electric shock.

xviii

Application Precautions 5

• Pay careful attention to the polarity (+/−) when connecting the terminal

blocks or connectors. Wrong connections may cause malfunction of the
system.

• Wire all terminals, communications paths, power supplies lines, and I/O
lines with the specified polarity and voltages. Improper wiring may result
in faulty operation.

• Install external breakers and take other safety measures against short-cir­cuiting in external wiring. Insufficient safety measures against short-cir­cuiting may result in burning.

• Do not mount the Unit near equipment that generates strong high-fre­quency noise.

• Leave the label attached to the Unit when wiring to prevent wire clippings
and other foreign matter from entering the Unit. Removing the label may
result in malfunction.

• Remove the label after the completion of wiring to ensure proper heat dis­sipation. Leaving the label attached may result in malfunction.

• Use crimp terminals for wiring. Do not connect bare stranded wires
directly to terminals. Connection of bare stranded wires may result in
burning.

• Wire correctly and double-check all the wiring or the setting switches
before turning ON the power supply. Incorrect wiring may result in burn­ing.

• Be sure that the terminal blocks, connectors, expansion cables, and other
items with locking devices are properly locked into place. Improper locking
may result in malfunction.

• Disconnect the LG and GR terminals on the Power Supply Unit before
performing insulation resistance or dielectric strength tests.

• Always use the power supply voltage specified in the operation manual.
An incorrect voltage may result in malfunction or burning.

• Take appropriate measures to ensure that the specified power with the
rated voltage and frequency is supplied. Be particularly careful in places
where the power supply is unstable. An incorrect power supply may result
in malfunction.

• Do not apply voltages to the Input Units in excess of the rated input volt­age. Excess voltages may result in burning.

• Do not apply voltages exceeding the maximum switching capacity to Out­put Units. The Output Units may be destroyed.

• Check the user program for proper execution before actually running it on
the Unit. Not checking the program may result in an unexpected opera­tion.

• Always turn OFF the power supplies to the PLC, slaves, and communica­tions before attempting any of the following. Not turning OFF the power
supply may result in malfunction or electric shock.

• Mounting or dismounting Power Supply Units, I/O Units, CPU Units,
memory casettes Master Unit, or any other Units

• Mounting or dismounting circuits for Remote I/O Terminals with 3-tier
terminal blocks.

• Assembling the Units

• Setting DIP switches or rotary switches

• Connecting or wiring the cables

xix

Application Precautions 5

• Connecting or disconnecting the connectors

• Before touching the Unit, be sure to first touch a grounded metallic object
in order to discharge any static built-up. Not doing so may result in mal­function or damage.

• Confirm that no adverse effect will occur in the system before attempting
any of the following. Not doing so may result in an unexpected operation.

• Changing the operating mode of the PLC. (including the Startup Mode
setting)

• Force-setting/force-resetting any bit in memory.

• Changing the present value of any word or any set value in memory.

• When replacing parts, be sure to confirm that the rating of a new part is
correct. Not doing so may result in malfunction or burning.

• Resume operation only after transferring to the new CPU Unit and/or Spe­cial I/O Units the contents of the DM and HR Areas required for resuming
operation. Not doing so may result in an unexpected operation.

• When transporting the Units, use special packing boxes and protect them
from excessive vibration or shock during transportation.

• Connect all communications cables within the limits given in the specifica­tions.

• Observe the following precautions when wiring communications cables.

• Separate the communications cables from power lines or high-tension
lines.

• Do not bend the communications cables.

• Do not pull on the communications cables with an excessive force.

• Do not place heavy objects on the communications cables.

• Be sure to put the communications cables inside conduits.

• Water-resistant Terminals used as Slaves are of IP67 construction. Do not
attempt to use the Watertight Terminals for applications where the Water­tight Terminals are always underwater.

• Install the Unit properly as specified in the operation manual. Improper
installation of the Unit may result in malfunction.

xx

Conformance to EC Directives 6

6 Conformance to EC Directives

6-1 Applicable Directives

•EMC Directives

6-2 Concepts

EMC Directives

OMRON devices that comply with EC Directives also conform to the related
EMC standards so that they can be more easily built into other devices or the
overall machine. The actual products have been checked for conformity to
EMC standards (see the following note). Whether the products conform to the
standards in the system used by the customer, however, must be checked by
the customer.

EMC-related performance of the OMRON devices that comply with EC Direc­tives will vary depending on the configuration, wiring, and other conditions of
the equipment or control panel on which the OMRON devices are installed.
The customer must, therefore, perform the final check to confirm that devices
and the overall machine conform to EMC standards.

Note Applicable EMC (Electromagnetic Compatibility) standards are listed in the

following table.

Unit EMS (Electromagnetic

C200HW-SRM21-V1 EN61131-2 EN61000-6-4 (See note 2.)
CS1W-SRM21 EN61131-2
CJ1W-SRM21 EN61000-6-2 (See note 1.)
CQM1-SRM21-V1 EN61131-2
SRM1-C0@-V2 EN61000-6-2 (See note 1.)
CPM2C-S@@@C(-DRT) EN61131-2
SRT1 and SRT2 Series EN61000-6-2 (See note 1.)

Note 1. These products have configurations with less than 30 m of I/O wiring, and

less than 10 m of power supply wiring.

2. Radiated emission for EN61000-6-4: 10-m regulations

6-3 Conformance to EC Directives

Observe the follow precautions when installing the CompoBus/S Units that
conform to the EC Directives.

1,2,3... 1. Since the CompoBus/S Units are classified as built-in types, be sure to in-

stall the Units inside a control panel.

2. Provide reinforced insulation or double insulation for the DC Power Sup­plies that are used as power sources for the alarm output, communications
circuits, and I/O circuits.

Susceptibility)

EMI (Electromagnetic

Interference)

3. The CompoBus/S Units that conform to the EC Directives also conforms
to the Common Emission Standard (EN61000-6-4). When incorporated
into a device, however, the requirements may vary depending on the con­figuration of the control panel to be used, relationship with other devices to
be connected, wiring, etc. Users are therefore requested to confirm Unit
conformance to the EC Directives by themselves.

xxi

SECTION 1

System Design

This section provides an overview of the CompoBus/S System and functions, and describes the various Masters, Slaves,
and connection devices that are used to configure a CompoBus/S System.

1-1 System Overview and Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1-1-1 System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1-1-2 Network Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1-1-3 Communications Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1-2 CompoBus/S System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1-2-1 Basic System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1-2-2 CompoBus/S System Components. . . . . . . . . . . . . . . . . . . . . . . . . . 8

1-3 Compatible Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1-3-1 Compatible Masters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1-3-2 Slave Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1-3-3 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

1-3-4 Connectors/Terminal Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

1-4 Startup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

1

System Overview and Features Section 1-1

1-1 System Overview and Features

1-1-1 System Overview

The CompoBus/S System is a remote I/O communications system with
reduced wiring that retains the functionality and ease of use of the original
remote I/O system (wired type), while providing higher-speed, longer-dis­tance, and highly reliable communications.

The CompoBus/S System allows connection of up to 32 I/O devices (Slaves)
to a Master Unit using only two signal wires, even on long production lines that
require multiple I/O control.

Connect up to 32 Slaves
(256 Points) for Each
Master Unit

CompoBus/S Master Unit

SYSMAC CS Series, C200HX/HG/HE-(Z)E,
C200HS, CJ Series, CQM1/CQM1H
(SRM1, CPM2C-S)

Slaves

Each CompoBus/S Master Unit can be connected to up to 32 Slaves of vari­ous types, including I/O Terminals and Sensor Terminals, and allows I/O com­munications for up to 256 points (128 inputs, 128 outputs).

Main line length: 500 m max.

Terminator

Up to 32 Slaves of various types

Flexible Wiring Configuration

CompoBus/S Master Unit

SYSMAC CS Series, C200HX/HG/
HE-(Z)E, C200HS, CJ Series, CQM1/
CQM1H (SRM1, CPM2C-S)

Total length: 200 m max.

Terminator

I/O Data Exchange without
Special Programming

2

Up to 32 Slaves of various types

I/O data can be exchanged between the Master and Slaves without requiring
any special ladder programming for communications. I/O information for each
Slave is exchanged between Slaves and the corresponding I/O Area in the
Master by simply setting the node number of each Slave.

System Overview and Features Section 1-1

Input Slave

CPU Unit's I/O Area

to

to

Node number

00
01
02
03
04
05

to
14
15
00
01
02
03
04
05
to
14
15

Word Bit

00 to 07

CIO
2000

08 to 15
00 to 07

CIO
2001

CIO
2002

to

CIO
2007

CIO
2008

CIO
2009

CIO
2010

to

CIO
2015

08 to 15
00 to 07
08 to 15

00 to 07
08 to 15
00 to 07
08 to 15
00 to 07
08 to 15
00 to 07
08 to 15

00 to 07
08 to 15

OUT
data

IN
data

Example settings using CJ1W-SRM21 Master
Unit with unit #00, connected to 32 Slaves.

Output

OUT node 0
8-point Output Slave

OUT node 2
16-point Output Slave

OUT node 4
8-point Output Slave

Input

IN node 0
8-point Input Slave

IN node 2
32-point Input Slave

IN node 14
16-point Input Slave

IN/OUT node1
8-point Input/
8-point Output
Slave

1-1-2 Network Features

The CompoBus/S has the following features.

Communications Modes Select either a High-speed Communications Mode or Long-distance Commu-

nications Mode for the CompoBus/S according to the system configuration.
The differences between the High-speed Communications Mode and the
Long-distance Communications Mode are described in 1-1-3 Communica-

tions Modes.

Flexible Wiring Up to
200 m

Long-distance
Communications Up to
500 m

High-speed
Communications

Water-resistance Slaves Water-resistant Terminals (IP67) can be used as Slaves to exchange I/O in

In Long-distance Communications Mode, flexible wiring is possible up to a
total cable length of 200 m with no restrictions on branching or node connec­tions, provided that 4-conductor VCTF cable or Special Flat Cable is used.

In Long-distance Communications Mode, communications over the main line
of up to 500 m are possible to control I/O devices in a wide area, provided that
2-conductor VCTF cable is used. In this case, however, each branch line can
be connected to a single Slave only, because the branch line cannot be fur­ther branched. Furthermore, the Master must be connected to either end of
the main line.

In High-speed Communications Mode, up to 16 Slaves with 128 I/O points
can be connected with a high-speed communications cycle time of only

0.5 ms. This cycle is fast enough for time-critical factory automation applica­tions.

places exposed to water. Water-resistant Terminals are, however, available
only when the communications cable is 4-conductor VCTF cable.

Reduced Wiring A Slave can be connected to a Master or another Slave with just one connect-

ing cable. If the 4-wire Special Flat Cable or 4-conductor VCTF cable is used,
the Slave’s communication power supply is also supplied through the cable,
so floor wiring can be reduced dramatically. Also, special connectors simplify
branching from a main cable.

3

System Overview and Features Section 1-1

Connecting to 4­conductor VCTF Cable

Use Both T-branch and
Multidrop Methods

Wide Variety of Masters Master Units are available as Special I/O Units for the CS-series,

Wide Variety of Slaves Units in a wide range are available as I/O Slaves for a variety of applications.

Easy Startup The CompoBus/S System can be started just by wiring the cables and making

Easy-to-obtain 4-conductor VCTF cable can be used instead of the Special
Flat Cable. Furthermore improvement in the environmental resistance of the
system is possible by using shielded connectors.

Both the T-branch and multidrop methods can be combined flexibly when wir­ing. In combination with the floor cables, this wiring feature allows a very flexi­ble system configuration. There are three types of cables (2-conductor VCTF
cable, 4-conductor VCTF cable, and Special Flat Cable), and when the Spe­cial Flat Cable is used, T-branch Connectors can be installed by simply snap­ping the connector on.

C200HX/C200HG/C200HE-(Z)E, C200HS, CS-series, CJ-series, and CQM1
PLCs and also available integrated with a CPU for the SRM1 and CPM2C-S.
The variety of Masters provides flexibility in configuring a system to match
your application needs.

Such Units include Remote Terminals and Sensor Terminals, which vary with
the number of I/O points or I/O type, Connector Terminals, which allow easy
wiring, and Water-resistant Terminals, which have a better protective con­struction. There are many Slaves available with advanced functions, including
Analog I/O Terminals for analog-to-digital or digital-to-analog conversion, and
CPM1A/CPM2A/CPM2C I/O Link Units for sharing data with the host PLC.

some simple settings. Replacement of earlier Remote I/O Systems is also
easy.

Slave Node Number
Provided on Indicators
and in PLC Memory

Slave Monitoring for
Improved Reliability

Troubleshooting is easy because the Slave’s node number is shown on the
Master’s indicators if an error occurs with a Slave. When a CS-series,
C200HX/HG/HE-(Z)E, or C200HS Master Unit is used, error information is
also stored in PLC memory.

When an error occurs with a Slave using a CS-series or CJ-series Master
Unit, the Slave's node number is stored in the DM Area using the Slave regis­tration function.

Reliability of the CS-series and CJ-series Master Units has been further
improved by the addition of the following functions.

Slave Registration Function

Registering Slaves in the Master allows the user to check whether connected
Slaves are joined to the network, and to detect whether Slaves are illegally
joined due to incorrect connection, or missing from the network due to a delay
in startup or malfunction of registered Slaves.

Communications Stop Mode

System malfunctions can be avoided by setting remote I/O communications to
stop when a communications error occurs.

4

System Overview and Features Section 1-1

1-1-3 Communications Modes

Both High-speed Communications Mode and the Long-distance Communica­tions Mode are supported by the CompoBus/S.

Item High-speed Communica-

Communications baud
rate

Communications cycle
time

750 kbps 93.75 kbps

0.5 ms or 0.8 ms (depending
on maximum number of I/O
points)

tions Mode

The communications distance and the connection configuration vary with the
communications mode and communications cable.

Cable High-speed Communications

2-conductor
VCTF cable

4-conductor
VCTF cable

Special Flat
Cable

Length of main line: 100 m max.
Length of branch line: 3 m max.
Total length of branch lines:
50 m max.

Length of main line: 30 m max.
Length of branch line: 3 m max.
Total length of branch lines: 30 m
max.

Length of main line: 30 m max.
Length of branch line: 3 m max.
Total length of branch lines:
30 m max.

Mode

Long-distance Communi-

cations Mode

4.0 ms or 6.0 ms (depend­ing on maximum number of
I/O points)

Long-distance Communica-

tions Mode

Length of main line: 500 m max.
Length of branch line: 6 m max.
Total length of branch lines:
120 m max.

Flexible branching, provided that
the total length of cable is a maxi­mum of 200 m.

Flexible branching, provided that
the total length of cable is a maxi­mum of 200 m.

Note The I/O response time may be slower when using Long-distance Communica-

tions Mode compared with High-speed Communications Mode. Refer to

O Response Time Characteristics

.

2-5 I/

5

CompoBus/S System Configuration Section 1-2

1-2 CompoBus/S System Configuration

1-2-1 Basic System Configuration

Remote Input
Terminals

Photoelectric Sensors,
Proximity Sensors, or
Limit Switches

Fiber Amplifier
Communications
Units

Master Unit

Photoelectric Sen­sors, Proximity Sen­sors, Limit Switches

Fiber
Amplifier
Units

C200HW-SRM21-V1 for CS1,
C200HX/C200HG/C200HE (-ZE), and C200HS
CS1W-SRM21 for CS Series, CJ1W-SRM21 for CJ Series,
CQM1-SRM21-V1 for all CQM1 PLCs
SRM1 Master Control Unit
CPM2C-S Series

Remote Input
Terminals
(3-tier terminal
block)

Remote Out­put Terminals

Solenoids or
valves

Remote I/O
Module

Remote Out­put Terminals
(3-tier termi­nal block)

Solenoids or
valves

Analog Input
Terminal

Remote I/O
Terminals
(3-tier termi­nal block)

Connector I/O
Terminals

Analog Output
Terminal

CPM2A or
CPM1A

Photoelectric Sensors or
Proximity Sensors with con­nectors

Sensor Terminals

Terminal-block Terminator

I/O Link Unit for
CPM1A/CPM2A

PCB

Optical Fiber Sensors

1 to 5 V,
4 to 20 mA

Master Characteristics

CS-series, C200HX/HG/HE-(Z)E, C200HS Master Units

• Multiple Masters (up to 16) can be connected to a single PLC.

• Up to 128 or 256 I/O points (DIP switch used to switch setting).

• Communications status stored in CPU Unit's I/O Area.

CS-series Master Units

• Multiple Masters (up to 96) can be connected to a single PLC.

• Up to 128 or 256 I/O points (DIP switch used to switch setting).

• Communications status stored in CPU Unit's I/O Area.

• Uses the Slave registration function to monitor which Slaves are joined to
the network.

• Communications can be stopped when a communications error occurs.

CJ-series Master Units

• Multiple Masters (up to 40) can be connected to a single PLC.

• Up to 128 or 256 I/O points (DIP switch used to switch setting).

• Communications status stored in CPU Unit's I/O Area.

Inverters or valves

6

CompoBus/S System Configuration Section 1-2

• Uses the Slave registration function to monitor which Slaves are joined to
the network.

• Communications can be stopped when a communications error occurs.

CQM1 Master Units

• Only one Master can be connected to a single PLC.

• Up to 32, 64, or 128 I/O points (DIP switch used to switch setting).

• Alarm output terminal provided to detect errors.

SRM1 and CPM2C-S Master Units with Built-in CPU Units

• Compact CPU Unit with built-in CompoBus/S communications functions.

• Up to 256 I/O points for CompoBus/S functions.

• Communications status stored in CPU Unit's AR Area.

Slave Characteristics

Remote Terminals

• Input or Output Terminals for general-purpose use.

• 4-point, 8-point, and 16-point Transistor Remote Terminals.

• Remote Terminals with no-contact transistor I/O, connector transistor out­puts, or relay contact outputs.

Remote Terminals (3-tier Terminal Blocks)

• Input or Output Terminals for general-purpose use.

• 16 points: 8 inputs and 8 outputs mixed.

• Wiring is simple because common terminals for I/O wiring are located at
each point on the 3-tier terminal block.

Connector Terminals

• All I/O wiring can be done using connectors, reducing the amount of labor
for wiring.

• Mounting brackets allow the direction of mounting to be changed.

Water-resistant Terminals

• Input or output terminals of IP67 construction.

• 4 or 8 inputs or outputs.

• Connecting to communications cable, I/O power supply, and I/O through
shielded connectors.

Remote I/O Modules

• Modular type that allows PCB mounting.

• 16-input model and 16-output model.

• User’s devices can be customized as CompoBus/S Slaves.

Sensor Terminals

• Easily connects to Photoelectric Sensor or Proximity Sensor with XS8
Connectors.

• 8-input/8-output model and 4-input/4-output model.

• Remote teaching and external diagnosis are possible by using output sig­nals of the Sensor Terminal.

Fiber Amplifier Communications Units

• Reduced wiring with ON/OFF output and power supply wiring not
required.

• Connecting a Fiber Amplifier Unit allows connection of up to 14 Optical
Fiber Sensors.

7

CompoBus/S System Configuration Section 1-2

• Mobile Console can be connected without the Head (Photoelectric Sen­sor setting, teaching, and adjustment can be executed on site.)

Analog Input Terminals

• Convert analog inputs to binary data.

• The number of analog input points can be switched between 4 points, 3
points, 2 points, and 1 point using a DIP switch.

• The following input ranges are supported:
0 to 5 V, 1 to 5 V, 0 to 10 V, –10 to 10 V, 0 to 20 mA, 4 to 20 mA

Analog Output Terminals

• Convert binary data to analog outputs.

• The number of analog output points can be switched between 2 points
and 1 point using a DIP switch.

• Supports the following output ranges:
1 to 5 V, 0 to 10 V, –10 to 10 V, 0 to 20 mA, 4 to 20 mA

I/O Link Terminals for CPM1A/CPM2A

• Create I/O Links (8 inputs, 8 outputs) with CPM1A and CPM2A PLCs.

CPM2C I/O Link Unit

• Creating I/O Links (8 inputs, 8 outputs) with CPM2C-series PLCs.

1-2-2 CompoBus/S System Components

System with Distinct Main and Branch Lines

The diagram below shows a CompoBus/S System in which the main line must
be distinguished from the branch lines under either of the following conditions.

• The system operates in High-speed Communications Mode.

• The system operates in Long-distance Communications Mode with 2-con­ductor VCTF cable. (The maximum length of the main line varies with the
type of communications cable.)

Communications Cable

Te r mi n a to r

Master

Communica­tions Power
Supply

Slave Slave

Master The Master administers the CompoBus/S System and manages the external

I/O of the Slaves. There is only 1 Master in a CompoBus/S System and the
Master must be connected at the end of the main line, as shown in the pre­ceding diagram.

Slave Slave Slave

Main line

Branch line

Power supply cable

Slave

T: T-branch connection
M: Multidrop connection

Slaves The external I/O connected to the Slaves is processed by communicating with

the Master through the CompoBus/S System.

Main/Branch Lines The main line is the main cable that connects the two most distant points of

the system. Cables branching from the main line are known as branch lines.

Cables CompoBus/S communications are transmitted through 2-conductor VCTF, 4-

conductor VCTF, or Special Flat Cable. When 4-conductor VCTF or Special

8

CompoBus/S System Configuration Section 1-2

Flat Cable is used, the communications power supply can be supplied through
the cable. The system shown in the preceding diagram uses 4-conductor
VCTF or Special Flat Cable. When 2-conductor VCTF cable is used, power
must be supplied to the Slaves through a separate cable.

Connection Methods Two methods can be used to connect CompoBus/S Slaves: the T-branch

method and the multidrop method. With the T-branch method, the Slave is
connected to a branch line which branches off from the main line. With the
multidrop method, the Slave is connected directly to the main line.

These two connection methods can both be used in the same system,
although it is not possible to make a secondary branch from a branch line.
Use OMRON’s Branch Connector, a T-joint for a shielded connector, or a com­mercially available terminal block to create a branch from the main line.

Termina tor A terminator must be connected to the end of the main line opposite the Mas-

ter in order to stabilize communications. There are three kinds of terminating
resistors available, a connector for use with Special Flat Cable, a terminal
block, and a shielded connector.

System with No Distinction between Main and Branch Lines

The diagram below shows a CompoBus/S System in which it is not necessary
to distinguish between the main line and branch lines. This applies to the fol­lowing conditions.

• The system operates in Long-distance Communications Mode with 4-con­ductor VCTF cable.

• The system operates in Long-distance Communications Mode with Spe­cial Flat Cable.
(The maximum length of cable is 200 m regardless of the type of commu­nications cable.)

Slave

Slave

Communica­tions Power
Supply

Slave

Slave

Master

Slave

Slave

Communications cable
Power supply cable

Slave

Slave

Slave

Slave

Slave

Terminator

Slave Slave Slave

T: T-branch connection

M: Multidrop connection

Master The Master administers the CompoBus/S System and manages the external

I/O of the Slaves. There is only one Master in a CompoBus/S System and the
Master can be connected anywhere.

Slaves The external I/O connected to the Slaves is processed by communicating with

the Master through the CompoBus/S System.

9