Omron SYSMAC CPM2B User manual

Cat.No. W371–E1–1
Programmable Controller
SYSMAC
CPM2B
OPERATION MANUAL

SYSMAC CPM2B
Programmable Controller
Operation Manual
Produced February 2000

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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 “PC”means Programmable Controller and is not used as an abbreviation for any-
thing else.
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 operation
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, or by any means, mechanical, electronic, photocopying, recording, or otherwise, without the prior written permis-
sion of 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 informa-
tion contained in this publication.

TABLE OF CONTENTS
vii
PRECAUTIONS xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Intended Audience xii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 General Precautions xii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Safety Precautions xii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Operating Environment Precautions xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Application Precautions xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 EC Directives xv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 1
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1 CPM2B Features and Functions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 System Configurations 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3 Structure and Operation 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 2
Board Specifications and Components 21. . . . . . . . . . . . . . .
2-1 Specifications 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 Board Components and their Functions 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3 I/O Connector and Terminal Pin Allocation 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 3
Installation and Wiring 35. . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Design Precautions 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 Selecting an Installation Site 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 Assembling the CPM2B Boards 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 Installing the CPM2B 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5 Wiring and Connections 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 4
Memory Areas 53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1 Introduction 54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2 I/O Allocation 55. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-3 SR Area 58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-4 AR Area 60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-5 PC Setup 64. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-6 Error Log 69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 5
Instruction Set 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-1 CPM2B Function Codes 72. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2 Alphabetic List by Mnemonic 73. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-3 Expansion Instructions 76. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 6
Using Programming Devices 77. . . . . . . . . . . . . . . . . . . . . . .
6-1 Using a Programming Console 78. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2 Programming Console Operations 84. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-3 Programming Example 106. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TABLE OF CONTENTS
viii
SECTION 7
Test Runs and Error Processing 113. . . . . . . . . . . . . . . . . . . .
7-1 Initial System Checks and Test Run Procedure 114. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-2 CPM2B Test Run Procedure 114. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-3 Self-diagnostic Functions 115. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-4 Troubleshooting Flowcharts 118. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-5 Maintenance Inspections 125. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-6 Battery Replacement 126. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendices
A Standard Models 129. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B Dimensions 133. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index 135. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Revision History 139. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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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 (PC) designed for control opera-
tions. 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 SYSMAC Support Software Operation Manuals: Basics and C-series PCs (W247 and W248)
provide descriptions of SSS operations for the CPM2B and other SYSMAC C-series PCs. The SYSMAC-
CPT Support Software Quick Start Guide (W332) and User Manual (W333) provide descriptions of ladder
diagram operations in the Windows environment. The WS02-CXPC1-E CX-Programmer User Manual
(W361) and the CX-Server User Manual (W362) provide details of operations for the WS02-CXPC1-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 configura-
tions, 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.
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 PC. Be sure to follow the directions and
precautions in this section when installing the CPM2B in a panel or cabinet, wiring the power supply, or
wiring I/O.
Section 4 describes the structure of the PC 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 information on Programming Console operations.
Section 7 describes procedures for trial CPM2B operation, self-diagnosis functions, and error processing
to identify and correct the hardware and software errors that can occur during PC 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
personal 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 (PC) and related devices.
The information contained in this section is important for the safe and reliable application of the Programmable Con-
troller. You must read this section and understand the information contained before attempting to set up or operate a
PC system.
1 Intended Audience xii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 General Precautions xii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Safety Precautions xii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Operating Environment Precautions xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Application Precautions xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 EC Directives xv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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3Safety Precautions
xii
1 Intended Audience
This manual is intended for the following personnel, who must also have knowl-
edge 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 ma-
chines, 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 programming and operating the Unit. Be
sure to read this manual before attempting to use the Unit and keep this manual
close at hand for reference during operation.
WARNING It is extremely important that a PC and all PC Units be used for the specified
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 PC System to the above-mentioned
applications.
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 Battery
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.
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 system
if an abnormality occurs due to malfunction of the PC or another external factor
affecting the PC operation. Not doing so may result in serious accidents.

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5Application Precautions
xiii
•Emergency stop circuits, interlock circuits, limit circuits, and similar safety
measures must be provided in external control circuits.
•The PC 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 coun-
termeasure for such errors, external safety measures must be provided to en-
sure safety in the system.
•The PC 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.
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 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 tempera-
ture.
•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 PC System can have a large effect on the lon-
gevity and reliability of the system. Improper operating environments can lead to
malfunction, failure, and other unforeseeable problems with the PC System. Be
sure that the operating environment is within the specified conditions at installa-
tion and remains within the specified conditions during the life of the system.
5 Application Precautions
Observe the following precautions when using the PC 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 PC before attempting any of the fol-
lowing. Not turning OFF the power supply may result in malfunction or electric
shock.

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5Application Precautions
xiv
•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
PC or the system, or could damage the PC. Always heed these precautions.
•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 PC. If power supply for the I/O circuits
comes ON before power supply for the PC, normal operation may be tempo-
rarily interrupted.
•If the operating mode is changed from RUN or MONITOR mode to PROGRAM
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 instruc-
tions), 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 malfunction.
•Install external breakers and take other safety measures against short-circuit-
ing in external wiring. Insufficient safety measures against short-circuiting 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 connector
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 circuit elements
they may cause short-circuiting.
•Be sure to perform wiring in accordance with the relevant operation manual.
Incorrect wiring may result in burning.
•Double-check all the wiring before turning ON the power supply. Incorrect wir-
ing may result in burning.
•Be sure that the terminal blocks, expansion cables, and other items with lock-
ing devices are properly locked into place. Improper locking may result in mal-
function.
•Be sure that terminal blocks and connectors are connected in the specified di-
rection with the correct polarity. Not doing so may result in malfunction.
•Check the user program for proper execution before actually running it on the
PC. Not checking the program may result in an unexpected operation.
•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.

6EC Directives
xv
•Changing the operating mode of the PC.
•Force-setting/force-resetting any bit in memory.
•Changing the present value of any word or any set value in memory.
•Resume operation only after transferring to the new CPU board the contents 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 positive
(+) 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 antistatic
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 malfunction or
damage.
•Do not touch the expansion I/O connecting cable while the power is being sup-
plied 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
•EMC Directives
•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 stan-
dards 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 cus-
tomer 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)
Low Voltage Directive
Always ensure that devices operating at voltages of 50 to 1,000 VAC and 75 to
1,500 VDC meet the required safety standards for the PC (EN61131-2).

6EC Directives
xvi
6-3 Conformance to EC Directives
The CPM2B PCs comply with EC Directives. To ensure that the machine or de-
vice in which the CPM2B PC is used complies with EC directives, the PC must be
installed as follows:
1, 2, 3... 1. The CPM2B PC 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 PCs 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 condi-
tions. You must therefore confirm that the overall machine or equipment
complies with EC Directives.
6-4 Relay Output Noise Reduction Methods
The CPM2B PCs conform to the Common Emission Standards (EN50081-2) of
the EMC Directives. However, the noise generated when the PC 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 appropriate countermea-
sures must be provided external to the PC.
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 PC included is less than 5 times per minute.
Countermeasures are required if the frequency of load switching for the whole
system with the PC included is 5 times or more per minute.

6EC Directives
xvii
Countermeasure Examples
When switching an inductive load, connect a surge protector, diodes, etc., in par-
allel with the load or contact as shown below.
Circuit Current Characteristic Required element
AC DC
CR method
Power
supply
Inductive load
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
experiments, and take into
consideration that the capacitance
suppresses spark discharge when the
contacts are separated 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.
Diode method
Power
supply
Inductive load
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.
Varistor method
Power
supply
Inductive load
Yes Yes The varistor method prevents the
imposition of high voltage between the
contacts by using the constant voltage
characteristic of the varistor. There is
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 varistor in parallel with the
load. If the supply voltage is 100 to
200 V, insert the varistor between the
contacts.
---

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 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 System Configurations 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2-1 CPU Boards 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2-2 Expansion I/O Boards 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2-3 Connecting a Programming Console 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2-4 Support Software 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2-5 One-to-one Computer Connections 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2-6 One-to-N Computer Connections 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2-7 OMRON PT Connections 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2-8 One-to-one PC Link Connections 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3 Structure and Operation 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-1 CPU Board Structure 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-2 Operating Modes 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-3 Operating Mode at Startup 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-4 PC Operation at Startup 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-5 Cyclic Operation and Interrupts 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1SectionCPM2B Features and Functions
2
1-1 CPM2B Features and Functions
1-1-1 CPM2B Features
The CPM2B PCs are compact Board PCs that can be incorporated easily into
control equipment. The PCs 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 equipment.
•The CPU Board itself can handle a wide range of machine control applications,
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 functions
to provide communications with personal computers, other OMRON PCs, and
OMRON Programmable Terminals. These communications capabilities allow
the user to design a low-cost distributed production system.
The CPU Board has 32 I/O points and Expansion
I/O Boards can be added to provide a total I/O ca-
pacity of up to 128 I/O points.
Peripheral Port
Programming Devices are compatible with other
models of OMRON PCs. 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 PC Link, or 1:1 NT Link
communications.
Relay Output Board Transistor Output Board
Basic Functions The CPM2B CPU Board itself is equipped with 32 I/O points in I/O terminals or
I/O connectors. There are 2 types of outputs available (relay outputs and sinking
transistor outputs). The power supply is 24 V DC only.
Up to 3 Expansion I/O Boards can be connected to the CPU Board to increase
the PC’s I/O capacity to a maximum of 128 I/O points. There are 2 types of
32-point Expansion I/O Boards available: one with relay outputs and the other
with sinking transistor outputs.
The same Programming Devices, such as Programming Consoles and Support
Software, can be used for the C200H, C200HS, C200HX/HG/HE, CQM1,
CPM1, CPM1A, CPM2A, CPM2C, and SRM1 (-V2) PCs, so existing ladder pro-
gram resources can be used effectively.
Built-in Motor Control Capability
Synchronized pulse control provides an easy way to synchronize the operation
of a peripheral piece of equipment with the main equipment. The output pulse
frequency can be controlled as some multiple of the input pulse frequency, al-
CPU Board I/O
Expansion I/O Boards
Share Programming
Devices
Synchronized Pulse
Control
(Transistor Outputs Only)

1-1SectionCPM2B Features and Functions
3
lowing the speed of a peripheral piece of equipment (such as a supply conveyor)
to be synchronized with the speed of the main piece of equipment.
Encoder CPM2B Motor driver Motor
Pulses are output as a fixed multiple of the input frequency.
The CPM2B has a total of five high-speed counter inputs. The one high-speed
counter input has a response frequency of 20 kHz/5 kHz and the four interrupt
inputs in counter mode have a response frequency of 2 kHz.
The high-speed counter can be used in any one of the four input modes: differen-
tial phase mode (5 kHz), pulse plus direction input mode (20 kHz), up/down
pulse mode (20 kHz), or increment mode (20 kHz). Interrupts can be triggered
when the count matches a set value or falls within a specified range.
The interrupt inputs in counter mode can be used for incrementing counters or
decrementing counters (2 kHz) and trigger an interrupt (executing the interrupt
program) when the count matches the target value.
CPM2B PCs with transistor outputs have two outputs that can produce 10 Hz to
10 kHz pulses (single-phase outputs).
When used as single-phase pulse outputs, there can be two outputs with a fre-
quency range of 10 Hz to 10 kHz with a fixed duty ratio or 0.1 to 999.9 Hz with a
variable duty ratio (0 to 100% duty ratio).
When used as pulse plus direction or up/down pulse outputs, there can be just
one output with a frequency range of 10 Hz to 10 kHz.
High-speed Input Capabilities for Machine Control
There are four inputs used for interrupt inputs (shared with quick-response in-
puts and interrupt inputs in counter mode) with a minimum input signal width of
50 µs and response time of 0.3 ms. When an interrupt input goes ON, the main
program is stopped and the interrupt program is executed.
There are four inputs used for quick-response inputs (shared with interrupt in-
puts and interrupt inputs in counter mode) that can reliably read input signals
with a signal width as short as 50 µs.
The input time constant for all inputs can be set to 1 ms, 2 ms, 3 ms, 5 ms,
10 ms, 20 ms, 40 ms, or 80 ms. The effects of chattering and external noise can
be reduced by increasing the input time constant.
Other Functions The interval timer can be set between 0.5 and 319,968 ms and can be set to gen-
erate just one interrupt (one-shot mode) or periodic interrupts (scheduled inter-
rupt mode).
There are two controls on the CPU Board that can be turned to change the ana-
log settings (0 to 200 BCD) in IR 250 and IR 251. These controls can be used to
easily change or fine-tune machine settings such as a conveyor belt’s pause
time or feed rate.
A DIP switch is provided that controls the status of four input bits.
The built-in clock (accuracy within 1 minute/month) can be read from the pro-
gram to show the current year, month, day, day of the week, and time. The clock
can be set from a Programming Device (such as a Programming Console) or the
time can be adjusted by rounding up or down to the nearest minute.
TIML(––) is a long-term timer that accommodates set values up to 99,990 sec-
onds (27 hours, 46 minutes, 30 seconds). When combined with the SECONDS
High-speed Counters and
Interrupts
Easy Position Control
with Pulse Outputs
(Transistor Outputs Only)
High-speed Interrupt
Input Function
Quick-response Input
Function
Stabilizing Input Filter
Function
Interval Timer Interrupts
Analog Settings
DIP Switch Inputs
Calendar/Clock
Long-term Timer

1-1SectionCPM2B Features and Functions
4
TO HOURS conversion instruction (HMS(––)), the long-term timer provides an
easy way to control equipment scheduling.
The CPM1-EMU01-V1 Expansion Memory Unit is a program loader for small-
size or micro PCs. Using the CPM1-EMU01-V1, simple on-site transfer of user
programs and data memory is possible with PCs.
Expansion Memory Unit
Indicator
UPLOAD+DM Button UPLOAD Button
EEPROM
CPM2C-CN111
(0.1 m) (See note 2.)
CS1W-CN114
(0.05 m)
CPM2B CPU Board
Peripheral port
Note 1. Refer totheCPM 2A Operation Manual (W352) or CPM2C Operation Manu-
al for details on the CPM1-EMV01-V1.
2. The CPM2C-CN111 can be connected only to the peripheral port.
Complete Communications Capabilities
A Host Link connection can be made through the PC’s RS-232C port or Periph-
eral port. A personal computer or Programmable Terminal connected in Host
Link mode can be used for operations such as reading/writing data in the PC’s
I/O memory or reading/changing the PC’s operating mode.
1:1 Host Link Communications
CPM2B
Commands
Responses
1:N Host Link Communications
CPM2B
(Up to 32 PCs can be connected.)
Commands
Responses
The TXD(48) and RXD(47) instructions can be used in no-protocol mode to ex-
change data with standard serial devices. For example, data can be received
Expansion Memory Unit
Host Link
No-protocol
Communications

1-1SectionCPM2B Features and Functions
5
from a bar code reader or transmitted to a serial printer. The serial devices can
be connected to the RS-232C port or Peripheral port.
Bar code
reader
Serial
printer
Inputting data from a bar code reader
Outputting data to a serial printer
CPM2B
CPM2B
In a 1:1 NT Link, an OMRON Programmable Terminal (PT) can be connected
directly to the CPM2B. The PT must be connected to the RS-232C port; it cannot
be connected to the Peripheral port.
OMRON PT
CPM2B
A CPM2B can be linked directly to another CPM2B, CQM1, CPM1, CPM1A,
CPM2A, CPM2C, SRM1(-V2), C200HS or C200HX/HG/HE PC. The 1:1 PC Link
allows automatic data link connections. The PCs must be connected through the
RS-232C ports; they cannot be connected through the Peripheral ports.
CPM2B CPM2B
1-1-2 Overview of CPM2B Functions
Main function Variations/Details
Interrupts Interrupt inputs
4 inputs, see note 1.
Response time: 50 µs
Interval timer interrupts
1 input Scheduled interrupts
Set value: 0.5 to 319,968 ms
Precision: 0.1 ms One-shot interrupt
High-speed 1:1 NT Link
Communications
One-to-one PC Link

1-2SectionSystem Configurations
6
Main function Variations/Details
High-speed counters High-speed counter No interrupt
1 input, see note 2.
Differential phase mode (5 kHz)
Pulse plus direction input mode (20 kHz)
Up/down input mode (20 kHz)
Increment mode (20 kHz)
Count-check interrupt
(An interrupt can be generated when the
count equals the set value or the count
lies within a preset range.)
Interrupt inputs in counter mode
4 inputs, see note 1. No interrupt
Incrementing counter (2 kHz)
Decrementing counter (2 kHz) Count-up interrupt
Pulse outputs 2 outputs:
Single-phase pulse output without acceleration/deceleration (See note 3.)
10 Hz to 10 kHz
2 outputs:
Variable duty ratio pulse output (See note 3.)
0.1 to 999.9 Hz, duty ratio 0 to 100%
1 output:
Pulse output with trapezoidal acceleration/deceleration (See note 3.)
Pulse plus direction output, up/down pulse output, 10 Hz to 10 kHz
Synchronized pulse control 1 point, see notes 2 and 3.
Input frequency range: 10 to 500 Hz, 20 Hz to 1 kHz, or 300 Hz to 20 kHz
Output frequency range: 10 Hz to 10 kHz
Quick-response input 4 inputs, see note 1.
Maximum input signal width: 50 µs
Analog settings 2 controls (setting ranges: 0 to 200 BCD)
Input time constant Determines the input time constant for all inputs. (Settings: 1, 2, 3, 5, 10, 20, 40, or 80 ms)
Calendar/Clock Shows the current year, month, day of the week, day of the month, hour, minute, and
second.
Error log Records the time of occurrence and error code.
Note 1. These four inputs are shared by interrupt inputs, interrupt inputs in counter
mode, and quick-response inputs, but each input can be used for only one
purpose.
2. This input is shared by the high-speed counter and synchronized pulse con-
trol functions.
3. This output is shared by the pulse output and synchronized pulse control
functions. These functions can be used with transistor outputs only.
1-2 System Configurations
1-2-1 CPU Boards
CPU Board with 32 I/O points
(Relay outputs) CPU Board with 32 I/O points (Transistor outputs)

1-2SectionSystem Configurations
7
CPU Board Inputs Outputs Battery Clock RS-232C
port Model
32 I/O points 16 inputs, 16 relay outputs --- --- --- CPM2B-32C1DR-D
(16 inputs, 16 outputs) 24 V DC (Terminal-block) Yes Yes Yes CPM2B-32C2DR-D (16 inputs, 16 outputs) 16 inputs, 16 sinking transistor --- --- --- CPM2B-32C1DT-D
24 V DC outputs (Connector) Yes Yes Yes CPM2B-32C2DT-D
1-2-2 Expansion I/O Boards
Up to 3 Expansion I/O Boards can be connected to the CPU Board.
Expansion I/O Board with 32 I/O points
(Relay outputs) Expansion I/O Board with 32 I/O points (Transistor outputs)
CPU Board Expansion connector
Expansion I/O Board Expansion connector
A PC with 128 I/O points (the maximum) can be assembled by connecting three
Expansion I/O Boards. The following configuration provides 64 inputs and 64
sinking transistor outputs:
CPM2B-32C1DT-D
(16 inputs, 16 outputs) CPM2B-32EDT (16 inputs, 16 outputs)
×1 Board+ ×3 Boards = 64 inputs, 64 outputs
Expansion I/O
Board Inputs Outputs Model
32 I/O points 16 inputs, 24 V DC 16 relay outputs
(Terminal-block) CPM2B-32EDR
(16 inputs,
16 outputs) 16 inputs, 24 V DC 16 sinking transistor
outputs (Connector) CPM2B-32EDT
Note When an NT-AL001-E Adapter is connected to the RS-232C port, only one Ex-
pansion I/O Board can be connected because of power supply limitations.
Expansion I/O Boards