Omron SYSMAC Gateway User manual

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OPERATION MANUAL
Cat. No. W371-E1-03
SYSMAC
CPM2B
Programmable Controller

SYSMAC CPM2B
Programmable Controller
Operation Manual
Revised July 2003

iv

v
Notice:
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 dam-
age to property.
!DANGER Indicates an imminently hazardous situation which, if not avoided, will result in death or
serious injury.
!WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury.
!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. “PC” is used, however, in some Program-
ming Device displays to mean Programmable Controller.
Visual Aids
The following headings appear in the left column of the manual to help you locate different types of
information.
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.
OMRON, 2000
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form, o
r
by any means, mechanical, electronic, photocopying, recording, or otherwise, without the prior written permission o
f
OMRON.
No patent liability is assumed with respect to the use of the information contained herein. Moreover, because OMRON is con-
stantly 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.

vi

vii
TABLE OF CONTENTS
PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
2 General Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
3 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
5 Application Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xiv
6 EC Directives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
SECTION 1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1-1 CPM2B Features and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1-2 System Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1-3 Structure and Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SECTION 2
Board Specifications and Components . . . . . . . . . . . . . . . . . 23
2-1 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2-2 Board Components and their Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2-3 I/O Connector and Terminal Pin Allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
SECTION 3
Installation and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3-1 Design Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3-2 Selecting an Installation Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3-3 Assembling the CPM2B Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3-4 Installing the CPM2B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3-5 Wiring and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
SECTION 4
Memory Areas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
4-1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4-2 I/O Allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4-3 SR Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4-4 AR Area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
4-5 PLC Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
4-6 Error Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
SECTION 5
Instruction Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
5-1 CPM2B Function Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
5-2 Alphabetic List by Mnemonic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
5-3 Expansion Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

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TABLE OF CONTENTS
SECTION 6
Using Analog I/O Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
6-1 Overview of Analog I/O Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
6-2 Specifications and Part Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
6-3 Overview of Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
6-4 Application Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
6-5 Troubleshooting Unit Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .116
SECTION 7
Using Programming Devices . . . . . . . . . . . . . . . . . . . . . . . . . 119
7-1 Using a Programming Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
7-2 Programming Console Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
7-3 Programming Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .153
SECTION 8
Test Runs and Error Processing . . . . . . . . . . . . . . . . . . . . . . 161
8-1 Initial System Checks and Test Run Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
8-2 CPM2B Test Run Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
8-3 Self-diagnostic Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
8-4 Troubleshooting Flowcharts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
8-5 Maintenance Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .174
8-6 Battery Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Appendices
A Standard Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
B Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
C Connections Diagrams for Connector Terminal Blocks and Relay Terminals . . . . . . . . . . . 185
Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199

ix
About this Manual:
This manual describes the installation and operation of the CPM2B and includes the sections
described below.
The CPM2B is a compact, high-speed board Programmable Controller (PLC) designed for control
operations. There are two manuals describing the setup and operation of the CPM2B: The CPM2B
Operation Manual (this manual) and the CPM1/CPM1A/CPM2A/CPM2C/SRM1(-V2) Programming
Manual (W353). (The CPM1/CPM1A/CPM2A/CPM2C/SRM1(-V2) Programming Manual is referred to
as simply the Programming Manual in this manual.)
This manual describes the system configuration and installation of the CPM2B and provides a basic
explanation of operating procedures for the Programming Consoles. Read this manual first to acquaint
yourself with the CPM2B.
The Programming Manual (W353) provides detailed descriptions of the CPM2B’s programming func-
tions. The WS02-CXP@@-E CX-Programmer Operation Manual (W414) provides details of operations
for the WS02-CXP@@-E CX-Programmer.
Please read this manual carefully and be sure you understand the information provided before
attempting to install and operate the CP2MB.
Section 1 describes the CPM2B’s special features and functions, shows the possible system configu-
rations, and outlines the steps required before operation. Read this section first when using the
CPM2B for the first time. Refer to the CPM1/CPM1A/CPM2A/CPM2C/SRM1(-V2) Programming Man-
ual (W353) for details on programming.
Section 2 provides the technical specifications of the CPM2B Boards and describes the main compo-
nents of the Boards.
Section 3 provides information on installing and wiring a CPM2B PLC. Be sure to follow the directions
and precautions in this section when installing the CPM2B in a panel or cabinet, wiring the power sup-
ply, or wiring I/O.
Section 4 describes the structure of the PLC memory areas and explains how to use them.
Section 5 provides a brief summary of the instruction set. Refer to the CPM1/CPM1A/CPM2A/
CPM2C/SRM1(-V2) Programming Manual (W353) for details on specific instructions.
Section 6 provides an overview of Analog I/O Boards, including specifications, wiring, installation
methods, basic settings, operations, and information on creating ladder programs.
Section 7 provides information on Programming Console operations.
Section 8 describes procedures for trial CPM2B operation, self-diagnosis functions, and error pro-
cessing to identify and correct the hardware and software errors that can occur during PLC operation.
Appendices provides lists of standard models and Board dimensions.
!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.

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xi
PRECAUTIONS
This section provides general precautions for using the Programmable Controller (PLC) and related devices.
The information contained in this section is important for the safe and reliable application of the Programmable
Controller. You must read this section and understand the information contained before attempting to set up or
operate a PLC system.
1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
2 General Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
3 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
5 Application Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
6 EC Directives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi

xii
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 specifica-
tions 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, amuse-
ment machines, safety equipment, and other systems, machines, and equip-
ment 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 programming and operating the Unit. Be
sure to read this manual before attempting to use the Unit and keep this man-
ual 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 appli-
cations.
3 Safety Precautions
!WARNING Do not attempt to take any board apart while the power is being supplied.
Doing so may result in electric shock.
!WARNING Do not touch any of the terminals, terminal blocks or, for the CPM2B, the CPU
board or expansion I/O board while the power is being supplied. Doing so may
result in electric shock.
!WARNING When handling the Memory Backup Battery, never drop, disassemble, distort,
short-circuit, heat to a high temperature, or throw into fire. Otherwise the Bat-
tery may explode, catch fire, or leak fluid.
!WARNING Do not attempt to disassemble, repair, or modify any Units. Any attempt to do
so may result in malfunction, fire, or electric shock.

xiii
Safety Precautions 3
!WARNING Provide safety measures in external circuits (i.e., not in the Programmable
Controller), including the following items, in order to ensure safety in the sys-
tem if an abnormality occurs due to malfunction of the PLC or another exter-
nal 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.
• 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 counter-
measure for such problems, external safety measures must be provided
to ensure safety in the system.
!WARNING When transferring programs to other nodes, or when making changes to I/O
memory, confirm the safety of the destination node before transfer. Not doing
so may result in injury.
!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 Tighten the screws on the terminal block to the torque specified in the opera-
tion manual. The loose screws may result in burning or malfunction.
!Caution When connecting the PLC to a personal computer or other peripheral device,
either ground the 0-V side of the PLC or do not ground the PLC at all.
Although some grounding methods short the 24-V side, as shown in the fol-
lowing diagram, never do so with the PLC.
24 V
0 V 0 V
0 V
PC Peripheral device
Non-isolated DC power
supply
INCORRECT Grounding: Shorting the 24-V side of the Power Supply

xiv
Operating Environment Precautions 4
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 tem-
perature.
• 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.
!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 condi-
tions at installation and remains within the specified conditions during the life
of the system.
5 Application Precautions
Observe the following precautions when using the PLC System.
!WARNING Always heed these precautions. Failure to abide by the following precautions
could lead to serious or possibly fatal injury.
• Always turn OFF the power supply to the PLC before attempting any of
the following. Not turning OFF the power supply may result in malfunction
or electric shock.
• Mounting or dismounting the CPU board or expansion I/O board.
• Setting 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 of
the PLC or the system, or could damage the PLC. Always heed these precau-
tions.

xv
Application Precautions 5
• Fail-safe 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.
• Construct a control circuit so that power supply for the I/O circuits does
not come ON before power supply for the PLC. If power supply for the I/O
circuits comes ON before power supply for the PLC, normal operation
may be temporarily interrupted.
• If the operating mode is changed from RUN or MONITOR mode to PRO-
GRAM mode, with the IOM Hold Bit ON, the output will hold the most
recent status. In such a case, ensure that the external load does not
exceed specifications. (If operation is stopped because of an operation
error (including FALS instructions), the values in the internal memory of
the CPU board will be saved, but the outputs will all turn OFF.)
• Always use the power supply voltage specified in the operation manuals.
An incorrect voltage may result in malfunction or burning.
• Take appropriate measures to ensure that the specified power with the
rated voltage is supplied. Be particularly careful in places where the
power supply is unstable. An incorrect power supply may result in mal-
function.
• Install external breakers and take other safety measures against short-cir-
cuiting in external wiring. Insufficient safety measures against short-cir-
cuiting may result in burning.
• Do not apply voltages to the input terminals in excess of the rated input
voltage. Excess voltages may result in burning.
• Do not apply voltages or connect loads to the output terminals in excess
of the maximum switching capacity. Excess voltage or loads may result in
burning.
• Be sure that all the mounting screws, terminal screws, and cable connec-
tor screws are tightened to the torque specified in the relevant manuals.
Incorrect tightening torque may result in malfunction.
• When wiring the CPM2B, take countermeasures to prevent wiring cuttings
from coming into contact with the product, such as covering the whole
product with a dustproof cover. If wiring cuttings adhere to the PCB or cir-
cuit elements they may cause short-circuiting.
• Be sure to perform wiring in accordance with the relevant operation man-
ual. Incorrect wiring may result in burning.
• Double-check all the wiring before turning ON the power supply. Incorrect
wiring may result in burning.
• Be sure that the terminal blocks, expansion cables, and other items with
locking devices are properly locked into place. Improper locking may
result in malfunction.
• Be sure that terminal blocks and connectors are connected in the speci-
fied direction with the correct polarity. Not doing so may result in malfunc-
tion.
• Check the user program for proper execution before actually running it on
the PLC. Not checking the program may result in an unexpected opera-
tion.
• 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.
• Force-setting/force-resetting any bit in memory.

xvi
EC Directives 6
• Changing the present value of any word or any set value in memory.
• Resume operation only after transferring to the new CPU board the con-
tents of the DM and HR Areas required for resuming operation. Not doing
so may result in an unexpected operation.
• Do not pull on the cables or bend the cables beyond their natural limit.
Doing either of these may break the cables.
• Do not place objects on top of the cables. Doing so may break the cables.
• Under no circumstances should batteries be short-circuited between pos-
itive (+) and negative (−) terminals, charged, disassembled, heated, or
thrown into fire.
• 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.
• When transporting or storing the CPM2B, cover the circuit boards in anti-
static material to protect them from static electricity and maintain the
proper storage temperature.
• Before touching the Unit, be sure to first touch a grounded metallic object
in order to discharge any static build-up. Not doing so may result in mal-
function or damage.
• Do not touch the expansion I/O connecting cable while the power is being
supplied in order to prevent any malfunction due to static electricity.
• Do not touch CPM2B circuit boards or the components mounted to them
with your bare hands. There are sharp leads and other parts on the
boards that may cause injury if handled improperly.
• When disposing the product, observe local ordinances and regulations.
6 EC Directives
6-1 Applicable Directives
•EMCDirectives
• Low Voltage Directive
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 Direc-
tives 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 as follows:
EMS (Electromagnetic Susceptibility): EN61131-2
EMI (Electromagnetic Interference): EN50081-2
(Radiated emission: 10-m regulations)

xvii
EC Directives 6
Low Voltage Directive
Always ensure that devices operating at voltages of 50 to 1,000 V AC and 75
to 1,500 V DC meet the required safety standards for the PLC (EN61131-2).
6-3 Conformance to EC Directives
The CPM2B PLCs comply with EC Directives. To ensure that the machine or
device in which the CPM2B PLC is used complies with EC directives, the PLC
must be installed as follows:
1,2,3... 1. The CPM2B PLC must be installed within a control panel.
2. Reinforced insulation or double insulation must be used for the DC power
supplies used for the communications and I/O power supplies.
3. CPM2B PLCs complying with EC Directives also conform to the Common
Emission Standard (EN50081-2). Radiated emission characteristics (10-m
regulations) may vary depending on the configuration of the control panel
used, other devices connected to the control panel, wiring, and other con-
ditions. You must therefore confirm that the overall machine or equipment
complies with EC Directives.
6-4 Relay Output Noise Reduction Methods
The CPM2B PLCs conform to the Common Emission Standards (EN50081-2)
of the EMC Directives. However, the noise generated when the PLC is
switched ON or OFF using the relay output may not satisfy these standards. In
such a case, a noise filter must be connected to the load side or other appro-
priate countermeasures must be provided external to the PLC.
Countermeasures taken to satisfy the standards vary depending on the
devices on the load side, wiring, configuration of machines, etc. Following are
examples of countermeasures for reducing the generated noise.
Countermeasures
(Refer to EN50081-2 for more details.)
Countermeasures are not required if the frequency of load switching for the
whole system with the PLC included is less than 5 times per minute.
Countermeasures are required if the frequency of load switching for the whole
system with the PLC included is 5 times or more per minute.

xviii
EC Directives 6
Countermeasure Examples
When switching an inductive load, connect a surge protector, diodes, etc., in
parallel with the load or contact as shown below.
Circuit Current Characteristic Required element
AC DC
Yes Yes If the load is a relay or solenoid, there
is a time lag between the moment the
circuit is opened and the moment the
load is reset.
If the supply voltage is 24 to 48 V,
insert the surge protector in parallel
with the load. If the supply voltage is
100 to 200 V, insert the surge protector
between the contacts.
The capacitance of the capacitor must
be 1 to 0.5 µF per contact current of
1 A and resistance of the resistor must
be 0.5 to 1 Ωper contact voltage of 1 V.
These values, however, vary with the
load and the characteristics of the
relay. Decide these values from experi-
ments, and take into consideration that
the capacitance suppresses spark dis-
charge when the contacts are sepa-
rated and the resistance limits the
current that flows into the load when
the circuit is closed again.
The dielectric strength of the capacitor
must be 200 to 300 V. If the circuit is an
AC circuit, use a capacitor with no
polarity.
No Yes The diode connected in parallel with
the load changes energy accumulated
by the coil into a current, which then
flows into the coil so that the current
will be converted into Joule heat by the
resistance of the inductive load.
This time lag, between the moment the
circuit is opened and the moment the
load is reset, caused by this method is
longer than that caused by the CR
method.
The reversed dielectric strength value
of the diode must be at least 10 times
as large as the circuit voltage value.
The forward current of the diode must
be the same as or larger than the load
current.
The reversed dielectric strength value
of the diode may be two to three times
larger than the supply voltage if the
surge protector is applied to electronic
circuits with low circuit voltages.
Yes Yes The varistor method prevents the impo-
sition of high voltage between the con-
tacts by using the constant voltage
characteristic of the varistor. There is
time lag between the moment the cir-
cuit is opened and the moment the load
is reset.
If the supply voltage is 24 to 48 V,
insert the varistor in parallel with the
load. If the supply voltage is 100 to
200 V, insert the varistor between the
contacts.
---
CR method
Power
supply
Inductive load
Diode method
Power
supply
Inductive load
Varistor method
Power
supply
Inductive load

1
SECTION 1
Introduction
This section describes the CPM2B’s special features and functions, shows the possible system configurations, and outlines
the steps required before operation. Read this section first when using the CPM2B for the first time.
Refer to the CPM1/CPM1A/CPM2A/CPM2C/SRM1(-V2) Programming Manual (W353) for details on programming.
1-1 CPM2B Features and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1-1-1 CPM2B Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1-1-2 Overview of CPM2B Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1-2 System Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1-2-1 CPU Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1-2-2 Expansion I/O Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1-2-3 Analog I/O Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1-2-4 Connecting a Programming Console. . . . . . . . . . . . . . . . . . . . . . . . . 11
1-2-5 Support Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1-2-6 One-to-one Computer Connections. . . . . . . . . . . . . . . . . . . . . . . . . . 12
1-2-7 One-to-N Computer Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1-2-8 OMRON PT Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1-2-9 One-to-one PLC Link Connections. . . . . . . . . . . . . . . . . . . . . . . . . . 15
1-3 Structure and Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1-3-1 CPU Board Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1-3-2 Operating Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1-3-3 Operating Mode at Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1-3-4 PLC Operation at Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1-3-5 Cyclic Operation and Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2
CPM2B Features and Functions Section 1-1
1-1 CPM2B Features and Functions
1-1-1 CPM2B Features
The CPM2B PLCs are compact Board PLCs that can be incorporated easily
into control equipment. The PLCs are equipped with a variety of advanced
features including synchronized pulse control, interrupt inputs, high-speed
counters, pulse outputs, and a clock function.
• The compact Board design is ideal for incorporation into control equip-
ment.
• The CPU Board itself can handle a wide range of machine control appli-
cations, so it is ideal for use as a built-in control unit in control equipment.
• The CPM2B is equipped with a full complement of communications func-
tions to provide communications with personal computers, other OMRON
PLCs, and OMRON Programmable Terminals. These communications
capabilities allow the user to design a low-cost distributed production sys-
tem.
Basic Functions
CPU Board I/O The CPM2B CPU Board itself is equipped with 32 or 40 I/O points in I/O termi-
nals or I/O connectors. There are 2 types of outputs available (relay outputs
and sinking transistor outputs). The power supply for the CPM2B CPU Board
is either 12 V DC or 24 V DC only.
Expansion I/O Boards Up to two 64-point Expansion I/O Boards can be connected to the CPU Board
to increase the PLC’s I/O capacity to a maximum of 168 I/O points. There are
also four types of 32-point Expansion I/O Boards available: two with relay out-
puts and the other with sinking transistor outputs. Up to three 32-point Expan-
sion I/O Boards can be connected to the CPU Board.
Share Programming
Devices
The CX-Programmer (Ver.1.2 or later) or Programming Console can be used
for programming and monitoring the CPM2B. Programming can also be per-
formed from the SYSMAC Support Software (SSS).
The CPU Board has 32 or 40 I/O points and Expan
sion I/O Boards can be added to provide a total I/O
capacity of up to 168 I/O points.
Peripheral Port
Programming Devices are compatible with other
models of OMRON PLCs. This port can also be
used for Host Link or no-protocol communications.
RS-232C Port
This port can be used for a Host Link,
no-protocol, 1:1 PLC Link, or 1:1 NT
Link communications.
Relay Output Board Transistor Output Board