Omron SYSMAC CPM2A User manual

Cat.No. W352–E1–3
Programmable Controllers
SYSMAC
CPM2A
OPERATION MANUAL

CPM2A Programmable Controllers
Operation Manual
Revised December 1999

!
!
!
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 “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, 1999
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 CPM2A Features and Functions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Basic System Configurations 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3 Structure and Operation 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4 Functions Listed by Usage 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5 Comparison with the CPM1A 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-6 Preparation for Operation 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 2
Unit Specifications and Components 27. . . . . . . . . . . . . . . .
2-1 Specifications 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 Unit Components 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 3
Installation and Wiring 43. . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Design Precautions 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 Selecting an Installation Site 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 Installing the CPM2A 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 Wiring and Connections 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 4
Using Programming Devices 83. . . . . . . . . . . . . . . . . . . . . . .
4-1 SYSMAC-CPT Support Software 84. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2 SYSMAC Support Software (SSS) 92. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-3 Using a Programming Console 95. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-4 Programming Console Operations 101. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-5 Programming Example 124. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 5
Test Runs and Error Processing 131. . . . . . . . . . . . . . . . . . . .
5-1 Initial System Checks and Test Run Procedure 132. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2 Self-diagnostic Functions 133. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-3 Programming Console Operation Errors 136. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-4 Programming Errors 136. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-5 Troubleshooting Flowcharts 137. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-6 Maintenance Inspections 145. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-7 Battery Replacement 146. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 6
Expansion Memory Unit 149. . . . . . . . . . . . . . . . . . . . . . . . . .
6-1 Overview 150. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2 Specifications and Nomenclature 151. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-3 Handling 152. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TABLE OF CONTENTS
viii
Appendices
A Standard Models 159. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B Dimensions 163. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index 171. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Revision History 175. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ix
About this Manual:
The CPM2A is a compact, high-speed Programmable Controller (PC) designed for control operations in
systems requiring from 10 to 120 I/O points per PC. There are two manuals describing the setup and
operation of the CPM2A: The CPM2A 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 CPM2A and provides a basic
explanation of operating procedures for the Programming Consoles. It also introduces the capabilities of
the SYSMAC Support Software (SSS) and SYSMAC-CPT Support Software. Read this manual first to
acquaint yourself with the CPM2A.
The Programming Manual (W353) provides detailed descriptions of the CPM2A’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 CPM2A 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 CPM2A.
Section 1 gives a brief overview of the steps involved in developing of a CPM2A System, describes the
possible system configurations, and describes the CPM2A’s special features and functions.
Section 2 provides the technical specifications of the Units that go together to create a CPM2A PC and
describes the main components of the Units.
Section 3 describes how to install and wire a CPM2A PC.
Section 4 describes SYSMAC and SYSMAC-CPT Support Software capabilities, how to connect the Pro-
gramming Console, and how to perform the various programming operations.
Section 5 describes how to perform a test run and how to diagnose and correct the hardware and soft-
ware errors that can occur during PC operation.
Section 6 describes how to use the CPM1-EMU01-V1 Expansion Memory Unit. Follow the handling pre-
cautions and procedures to properly use the Unit.
Appendix A provides tables of CPM2A Units and related products.
Appendix B provides the dimensions of CPM2A Units.
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.
!

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

!
!
!
!
!
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 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 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.
•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.

!
!
!
!
!
!
!
5Application Precautions
xiii
•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.
•When the 24-VDC output (service power supply to the PC) 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 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 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 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 connect to a ground such that the grounding resistance does not ex-
ceed 100 Ωwhen installing the Units. Not connecting to the correct ground
may result in electric shock.

!
5Application Precautions
xiv
•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.
•Mounting or dismounting I/O Units, CPU Units, Memory Cassettes, or any
other Units.
•Assembling the Units.
•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 of the
PC or the system, or could damage the PC or PC Units. Always heed these pre-
cautions.
•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 Unit. If power supply for the I/O circuits
comes ON before power supply for the Unit, 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 Unit 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 and frequency 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.
•Disconnect the functional ground terminal when performing withstand voltage
tests. Not disconnecting the functional ground terminal may result in burning.
•Install the Unit properly as specified in the operation manual. Improper installa-
tion of the Unit may result in malfunction.
•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.
•Be sure to leave the labels attached at the time of shipment on the CPM1 or
CPM2A when wiring in order to prevent wiring cuttings from entering the Unit.
•Remove the label after the completion of wiring to ensure proper heat dissipa-
tion. Leaving the label attached may result in malfunction.
•Be sure to perform wiring in accordance with the relevant operation manual.
Incorrect wiring may result in burning.
•Use crimp terminals for wiring. Do not connect bare stranded wires directly to
terminals. Connection of bare stranded wires may result in burning.

6EC Directives
xv
•Double-check all the wiring before turning ON the power supply. Incorrect wir-
ing may result in burning.
•Be sure that the terminal blocks, Memory Units, 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 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
Unit. 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.
•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 Unit 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.
•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.
•When using a thermocouple-input type Temperature Sensor Unit, observe the
following precautions:
•Do not remove the cold junction compensator attached at the time of deliv-
ery. If the cold junction compensator is removed the Unit will not be able to
measure temperatures correctly.
•Each of the input circuits is calibrated with the cold junction compensator
attached to the Unit. If the Unit is used with the cold junction compensator
from other Units, the Unit will not be able to measure temperatures cor-
rectly.
•Do not touch the cold junction compensator. Doing so may result in incor-
rect temperature measurement.
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

6EC Directives
xvi
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).
6-3 Conformance to EC Directives
The CPM2A PCs comply with EC Directives. To ensure that the machine or de-
vice in which the CPM2A PC is used complies with EC directives, the PC must be
installed as follows:
1, 2, 3... 1. The CPM2A 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. CPM2A 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 CPM2A 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.
---

6EC Directives
xviii
6-5 CPM1A-MAD01 Conformance to EMC Directives
Immunity testing conditions when using the current I/O of the CPM1A-MAD01
are as follows.
•Total accuracy: +10%/-1%
•Insert the following core in each line as shown below.
Recommended core: 2643-002402
Manufacturer: Fair Rite Products Corp.

1
SECTION 1
Introduction
This section describes the CPM2A’s special features and functions, shows the possible system configurations, and outlines the
steps required before operation. Read this section first when using the CPM2A for the first time.
Refer to the CPM1/CPM1A/CPM2A/CPM2C/SRM1(-V2) Programming Manual (W353) for details on programming opera-
tion.
1-1 CPM2A Features and Functions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1-1 CPM2A Features 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1-2 Overview of CPM2A Functions 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Basic System Configurations 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2-1 Stand-alone CPU Unit 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2-2 CPU Unit, Expansion Units, and Expansion I/O Units 8. . . . . . . . . . . . . . . . . . . . .
1-3 Structure and Operation 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-1 CPU Unit Structure 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-2 Operating Modes 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-3 Operating Mode at Startup 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-4 PC Operation at Startup 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-5 Cyclic Operation and Interrupts 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4 Functions Listed by Usage 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5 Comparison with the CPM1A 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-6 Preparation for Operation 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1SectionCPM2A Features and Functions
2
1-1 CPM2A Features and Functions
1-1-1 CPM2A Features
The CPM2A PCs incorporate a variety of features in a compact Unit, including
synchronized pulse control, interrupt inputs, pulse outputs, analog settings, and
a clock function. Also, the CPM2A CPU Unit is a stand-alone Unit that can han-
dle a broad range of machine control applications, so it is ideal for use as a built-
in control unit in equipment.
The full complement of communications functions provide communications with
personal computers, other OMRON PCs, and OMRON Programmable Termi-
nals. These communications capabilities allow the user to design a low-cost dis-
tributed production system.
The CPU Unit contains 20, 30, 40, or 60 I/O points
and Expansion I/O Units can be added to provide a
total I/O capacity of up to 120 I/O points. Analog I/O
Units, Temperature Sensor Units, and CompoBus/S
I/O Link Units can also be connected.
Peripheral Port
Programming Devices are compatible with
other models of OMRON PCs. This port
can also be used for Host Link or no-proto-
col 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.
Basic Functions The CPM2A PCs are one-piece PCs with 20, 30, 40, or 60 built-in I/O terminals.
There are 3 types of outputs available (relay outputs, sinking transistor outputs,
and sourcing transistor outputs) and 2 types of power supplies available
(100/240 VAC or 24 VDC).
Up to 3 Expansion I/O Units can be connected to the CPU Unit to increase the
PC’s I/O capacity to a maximum of 120 I/O points. There are 3 types of Expan-
sion I/O Units available: a 20-point I/O Unit, an 8-point Input Unit, and an 8-point
Output Unit. The maximum I/O capacity of 120 I/O points is achieved by con-
necting three 20-point I/O Units to a CPU Unit with 60 built-in I/O terminals.
Up to 3 Analog I/O Units can be connected to provide analog inputs and outputs.
Each Unit provides 2 analog inputs and 1 analog output, so a maximum of 6 ana-
log inputs and 3 analog outputs can be achieved by connecting 3 Analog I/O
Units. (Time-proportional control can be performed by combining the analog I/O
points with the PID(––) and PWM(––) instructions.)
•The analog input range can be set to 0 to 10 VDC, 1 to 5 VDC, or 4 to 20 mA
with a resolution of 1/256. (The open-circuit detection function can be used
with the 1 to 5 VDC and 4 to 20 mA settings.)
•The analog output range can be set to 0 to 10 VDC, –10 to 10 VDC, or 4 to
20 mA with a resolution of 1/256.
A Temperature Sensor Unit can be connected to provide up to 6 inputs for tem-
perature input from sensors, such as thermocouples or platinum resistance
CPU Unit Variations
Expansion I/O Units
Analog I/O Units
Temperature Sensor
Units

1-1SectionCPM2A Features and Functions
3
thermometers. The PID(––) instruction can be used with a Temperature Sensor
Unit for easy temperature monitoring.
CompoBus/S I/O Link Units can be connected to make the CPM2A a Slave De-
vice in a CompoBus/S Network. The I/O Link Unit has 8 input bits (internal) and
8 output bits (internal).
The CompoBus/S Network provides distributed CPU control based on a “PC +
compact PC”configuration, which is an improvement on the earlier distributed
I/O control based on a “PC + remote I/O”configuration. The distributed CPU
control makes equipment modular, so designs can be standardized, special
needs can be addressed, and modules can be replaced easily in the event of a
breakdown.
Master PC CompoBus/S Master Unit
(or SRM1 CompoBus/S Master Control Unit)
CPM2A (Slave) CompoBus/S I/O Link Unit
CompoBus/S
Distributed CPU control
The same Programming Devices, such as Programming Consoles and Support
Software, can be used for the C200H, C200HS, C200HX/HG/HE, CQM1,
CPM1, CPM1A, CPM2C, and SRM1 (-V2) PCs, so existing ladder program re-
sources 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-
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 CPM2A Motor driver Motor
Pulses are output as a fixed multiple of the input frequency.
The CPM2A 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 (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.
CPM2A 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).
CompoBus/S I/O Link
Units
Share Programming
Devices
Synchronized Pulse
Control
(Transistor Outputs Only)
High-speed Counters and
Interrupts
Easy Position Control
with Pulse Outputs
(Transistor Outputs Only)

1-1SectionCPM2A Features and Functions
4
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 Unit that can be turned to change the analog
settings (0 to 200 BCD) in IR 250 and IR 251. These controls can be used to eas-
ily change or fine-tune machine settings such as a conveyor belt’s pause time or
feed rate.
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
TO HOURS conversion instruction (HMS(––)), the long-term timer provides an
easy way to control equipment scheduling.
The PID(––) instruction can be used with an Analog I/O Unit to control analog
I/O.
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
High-speed Interrupt
Input Function
Quick-response Input
Function
Stabilizing Input Filter
Function
Interval Timer Interrupts
Analog Settings
Calendar/Clock
Long-term Timer
Analog PID Control
Host Link

1-1SectionCPM2A Features and Functions
5
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
CPM1-CIF01
CPM2A (Peripheral port connection*)
*An RS-232C Adapter is needed
to connect to the Peripheral port.
1:N Host Link Communications
B500-AL004
Link Adapter
CPM2A
(RS-232C port connection)
RS-232C/RS-422A Adapter
(Up to 32 PCs can be connected.)
NT-AL001
Commands
Responses
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
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.
*An RS-232C Adapter is needed to connect to the Peripheral port.
CPM2A
(RS-232C port connection*)
Inputting data from
a bar code reader
Bar code reader
CPM2A
(RS-232C port connection*)
Outputting data to
a serial printer
Serial printer
In a 1:1 NT Link, an OMRON Programmable Terminal (PT) can be connected
directly to the CPM2A. The PT must be connected to the RS-232C port; it cannot
be connected to the Peripheral port.
OMRON PT
CPM2A
(RS-232C port connection)
A CPM2A can be linked directly to another CPM2A, CQM1, CPM1, CPM1A,
CPM2C, SRM1(-V2), or a C200HS or C200HX/HG/HE PC. The 1:1 PC Link al-
No-protocol
Communications
High-speed 1:1 NT Link
Communications
One-to-one PC Link

1-1SectionCPM2A Features and Functions
6
lows automatic data link connections. The PC must be connected through the
RS-232C port; it cannot be connected through the Peripheral port.
CPM2A
(RS-232C port connection) CPM2A (RS-232C port connection)
The CPM1-EMU01-V1 Expansion Memory Unit is a program loader for small-
size or micro PLCs. Using the CPM1-EMU01-V1, simple on-site transfer of user
programs and data memory is possible with PLCs.
Uploading
Downloading
EEPROM
SYSMAC
Expansion Memory Unit