Omron CVM1 Series User manual

Cat. No. W351-E1-03
Programmable Controllers
SYSMAC CVM1D
Duplex System

SYSMAC CVM1D
Duplex System
Programmable Controllers
Operation Manual
Revised April 2003

Thank you for your continued support of OMRON and OMRON products.
Production of the HMC-ES251/551 Memory Cards built into CVM1/CV/CVM1D-series CPU Units has been
terminated as of February 2004. Please use the HMC-ES252/552 Memory Cards as replacement products.
Differences in Specifications
The appearance (color) and life expectance of the replacement products have changed, but the basic
specifications as Memory Cards are the same.
Discontinued products Replacement productsItem
HMC-ES251 HMC-ES551 HMC-ES252 HMC-ES552
Memory type SRAM
Memory capacity 256 KB 512 KB 256 KB 512 KB
File capacity 112 files
Battery life 1 year 0.5 years 5 years
Replacement
Battery HMC-BAT01 HMC-BAT01 or HMC-BAT02 (to be marketed soon)
Appearance (color) Orange Yellow
Replacing the Battery in
HMC-ES252/552 Memory Cards
The Battery replacement procedure for the
HMC-ES252/552 is basically the same as that
for the HMC-ES251/551. The shape of the
Battery holder, however, is different, so step 3,
below, is different.
1. If the Memory Card power indicator (M/C ON)
is lit, press the Memory Card power switch to
turn OFF the indicator. If the indicator is
already not lit, press the switch so that the
indicator is lit for at least 10 s and then press
the switch again to turn OFF the indicator.
2. After confirming that the Memory Card power
indicator is not lit, press Memory Card
ejection button and remove the Memory Card
from the CPU Unit.
Complete Battery replacement (steps 3 to 5,
below) within one minute. If more than one
minute elapses, memory may be lost.
3. Slide the lock knob on the battery holder to
the left to release the lock and remove the
holder from the Memory Card.
Write-protect switch
OFF ON
Battery holder lock knob
Locked
Released
Battery holder
Lock knob
4. Remove the old Battery from the battery
holder and insert a new Battery.
Battery
Battery
holder
Insert the battery with
the positive terminal
facing up.
5. Insert the battery holder into the Memory
Card. Be sure the battery holder is inserted
all the way to the back, press in on the
battery holder so that it does not come out,
and slide the lock knob to the right to lock the
battery holder in place. Be sure that the
battery holder cannot be pulled output after
completing this step.
6. Insert the Memory Card into the CPU Unit.
4258
SYSMAC CVM1/CV/CVM1D Series
Memory Cards Built into CPU Units
Models: HMC-ES251/551 (SRAM)
Information on Replacing Discontinued Products
Applicable Manuals
W195
W202
W350
W351
OMRON Corporation

1
No. 6182
OMRON Corporation
Please read and understand this manual before using the product. Please consult your OMRON
representative if you have any questions or comments.
Read and Understand this Manual
Warranty and Limitations of Liability
WARRANTY
OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a
period of one year (or other period if specified) from date of sale by OMRON.
OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON-
INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR PARTICULAR PURPOSE OF THE
PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES THAT THE BUYER OR USER ALONE HAS
DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR
INTENDED USE. OMRON DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED.
LIMITATIONS OF LIABILITY
OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES,
LOSS OF PROFITS OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS,
WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT
LIABILITY.
In no event shall the responsibility of OMRON for any act exceed the individual price of the product on which
liability is asserted.
IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS
REGARDING THE PRODUCTS UNLESS OMRON'S ANALYSIS CONFIRMS THAT THE PRODUCTS
WERE PROPERLY HANDLED, STORED, INSTALLED, AND MAINTAINED AND NOT SUBJECT TO
CONTAMINATION, ABUSE, MISUSE, OR INAPPROPRIATE MODIFICATION OR REPAIR.

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No. 6182
Application Considerations
SUITABILITY FOR USE
OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the
combination of products in the customer's application or use of the products.
At the customer's request, OMRON will provide applicable third party certification documents identifying
ratings and limitations of use that apply to the products. This information by itself is not sufficient for a
complete determination of the suitability of the products in combination with the end product, machine,
system, or other application or use.
The following are some examples of applications for which particular attention must be given. This is not
intended to be an exhaustive list of all possible uses of the products, nor is it intended to imply that the uses
listed may be suitable for the products:
• Outdoor use, uses involving potential chemical contamination or electrical interference, or conditions or
uses not described in this manual.
• Nuclear energy control systems, combustion systems, railroad systems, aviation systems, medical
equipment, amusement machines, vehicles, safety equipment, and installations subject to separate
industry or government regulations.
• Systems, machines, and equipment that could present a risk to life or property.
Please know and observe all prohibitions of use applicable to the products.
NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR
PROPERTY WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO
ADDRESS THE RISKS, AND THAT THE OMRON PRODUCTS ARE PROPERLY RATED AND INSTALLED
FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.
PROGRAMMABLE PRODUCTS
OMRON shall not be responsible for the user's programming of a programmable product, or any
consequence thereof.

No. 6182
3
Disclaimers
CHANGE IN SPECIFICATIONS
Product specifications and accessories may be changed at any time based on improvements and other
reasons.
It is our practice to change model numbers when published ratings or features are changed, or when
significant construction changes are made. However, some specifications of the products may be changed
without any notice. When in doubt, special model numbers may be assigned to fix or establish key
specifications for your application on your request. Please consult with your OMRON representative at any
time to confirm actual specifications of purchased products.
DIMENSIONS AND WEIGHTS
Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when
tolerances are shown.
PERFORMANCE DATA
Performance data given in this manual is provided as a guide for the user in determining suitability and does
not constitute a warranty. It may represent the result of OMRON's test conditions, and the users must
correlate it to actual application requirements. Actual performance is subject to the OMRON Warranty and
Limitations of Liability.
ERRORS AND OMISSIONS
The information in this manual has been carefully checked and is believed to be accurate; however, no
responsibility is assumed for clerical, typographical, or proofreading errors, or omissions.

iv

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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, 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.

vi

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 Conformance to EC Directives xv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 1
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1 Overview 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Relay Circuits: The Roots of PC Logic 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3 PC Terminology 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4 OMRON Product Terminology 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5 Overview of PC Operation 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-6 PC Operating Modes 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-7 Programming Devices 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-8 CVM1D Program Memory 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-9 Related Manuals 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 2
Hardware Considerations 11. . . . . . . . . . . . . . . . . . . . . . . . .
2-1 CPU Unit Switch Settings 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 Duplex Unit Switch Settings 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3 EM Units 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4 Memory Cards 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-5 Setting Rack Numbers 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-6 I/O Control Unit and I/O Interface Unit Displays 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 3
Memory Areas 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Introduction 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 Data Area Structure 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 CIO (Core I/O) Area 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 TR (Temporary Relay) Area 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5 CPU Bus Link Area 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-6 Auxiliary Area 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-7 Timer Area 59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-8 Counter Area 60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-9 DM and EM Areas 60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-10 Index and Data Registers (IR and DR) 62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 4
Writing Programs 65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1 Basic Procedure 66. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2 Instruction Terminology 66. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-3 Basic Ladder Diagrams 67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-4 Mnemonic Code 72. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-5 Branching Instruction Lines 79. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-6 Jumps 83.................................................................
4-7 Controlling Bit Status 85. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-8 Intermediate Instructions 87. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-9 Work Bits (Internal Relays) 87. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-10 Programming Precautions 89. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-11 Program Execution 90. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-12 Data Formats 90. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TABLE OF CONTENTS
viii
SECTION 5
Instruction Set 95. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-1 Notation 100. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2 Instruction Format 100. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-3 Data Areas, Definers, and Flags 100. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-4 Differentiated and Immediate Refresh Instructions 103. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-5 Coding Right-hand Instructions 105. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-6 Ladder Diagram Instructions 107. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-7 Bit Control Instructions 112. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-8 INTERLOCK and INTERLOCK CLEAR: IL(002) and ILC(003) 120. . . . . . . . . . . . . . . . . .
5-9 JUMP and JUMP END: JMP(004) and JME(005) 122. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-10 CONDITIONAL JUMP: CJP(221)/CJPN(222) 125. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-11 END: END(001) 126. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-12 NO OPERATION: NOP(000) 126. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-13 Timer and Counter Instructions 127. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-14 Shift Instructions 147. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-15 Data Movement Instructions 175. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-16 Comparison Instructions 193. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-17 Conversion Instructions 207. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-18 BCD Calculation Instructions 237. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-19 Binary Calculation Instructions 249. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-20 Symbol Math Instructions 259. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-21 Floating-point Math Instructions 280. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-22 Increment/Decrement Instructions 301. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-23 Special Math Instructions 306. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-24 PID and Related Instructions 317. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-25 Logic Instructions 330. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-26 Time Instructions 337. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-27 Special Instructions 342. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-28 Flag/Register Instructions 354. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-29 STEP DEFINE and STEP START: STEP(008)/SNXT(009) 356. . . . . . . . . . . . . . . . . . . . . . .
5-30 Subroutines 365. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-31 Stack Instructions 370. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-32 Data Tracing 374. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-33 Special I/O Instructions 377. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-34 Network Instructions 385. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-35 Block Programming Instructions 400. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 6
Program Execution Timing 413. . . . . . . . . . . . . . . . . . . . . . . .
6-1 PC Operation 414. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2 Cycle Time 418. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-3 Calculating Cycle Time 423. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-4 Instruction Execution Times 425. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-5 I/O Response Time 437. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 7
PC Setup 441. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-1 PC Setup Overview 442. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-2 PC Setup Details 443. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-3 PC Setup Default Settings 446. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index 449. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Revision History 459. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ix
About this Manual:
This manual describes the operation and programming of the CVM1D Duplex System Programmable
Controllers and includes the sections described below.
Please read this and all related manuals carefully and be sure you understand the information provide
before attempting to operate or program a CVM1D Duplex System Programmable Controller. The main
manuals required for operation are listed below. A list of other related manuals is provided at the end of
Section 1 Introduction.
Manual Contents Cat. No.
CVM1D Duplex System PC Installation
Guide Describes the system configuration, specifications, installation, and wiring. W350
CVM1D Duplex System PC Operation
Manual Describes ladder-diagram programming and programming instructions. W351
CVM1-PRS21-EV1 Programming Console
Operation Manual Describes Programming Console operations. W222
CVM1/CV-series PCs Operation Manual:
Host Link System Describes communications methods with host computers. W205
Section 1 gives a brief overview of the history of Programmable Controllers and explains terms common-
ly used in ladder-diagram programming. It provides an overview of the process of programming and oper-
ating a PC and explains basic terminology used with OMRON PCs. It also describes the Programming
Devices that can be used and provides a list of related FA products and manuals.
Section 2 provides information on hardware aspects of CVM1D PCs that are relevant to programming
and software operation. These include switches on the CPU Unit and basic PC configuration. This in-
formation is covered in more detail in the CVM1D Installation Guide.
Section 3 describes the way in which PC memory is broken into various areas used for different pur-
poses. The contents of each area and addressing conventions, including the use of indirect addressing
and addressing registers, are also described.
Section 4 explains the basic steps and concepts involved in writing a basic ladder diagram program. It
introduces the instructions that are used to build the basic structure of the ladder diagram and control its
execution, along with a few other instructions of special interest in programming.
Section 5 explains each instruction in the CVM1D PC instruction set and provides the ladder diagram
symbols, data areas, and flags used with each.
Section 6 explains the execution cycle of the PC and shows how to calculate the cycle time and I/O re-
sponse times. I/O response times in Link Systems are described in the individual System Manuals.
Section 7 lists the parameters in the PC Setup, provide examples of normal application, and provide the
default values. The use of each parameter in the PC Setup is described where relevant in this manual and
in other CVM1D manuals.
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 Conformance to EC Directives xv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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5Safety 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 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 There is a lithium battery built into the SRAM Memory Cards. Do not short the
positive and negative terminals of the battery, charge the battery, attempt to take
it apart, subject it to pressures that would deform it, incinerate it, or otherwise
mistreat it. Doing any of these could cause the battery to erupt, ignite, or leak.
WARNING The CPU Unit refreshes I/O even when the program is stopped (i.e., even in
PROGRAM mode). Confirm safety thoroughly in advance before changing the
status of any part of memory allocated to I/O Units, Special I/O Units, or CPU Bus
Units. Any changes to the data allocated to any Unit may result in unexpected
operation of the loads connected to the Unit. Any of the following operation may
result in changes to memory status.
•Transferring I/O memory data to the CPU Unit from a Programming Device.

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5Application Precautions
xiii
•Changing present values in memory from a Programming Device.
•Force-setting/-resetting bits from a Programming Device.
•Transferring I/O memory from a host computer or from another PC on a net-
work.
Caution Execute online edit only after confirming that no adverse effects will be caused
by extending the cycle time. Otherwise, the input signals may not be readable.
Caution Confirm safety at the destination node before transferring a program to another
node or changing the I/O memory area. Doing either of these without confirming
safety may result in injury.
Caution Tighten the screws on the terminal block of the AC Power Supply Unit to the
torque specified in the operation manual. The loose screws may result in burning
or malfunction.
4 Operating Environment Precautions
Caution Do not operate the control system in the following places:
•Locations subject to direct sunlight.
•Locations subject to temperatures or humidity outside the range specified in
the specifications.
•Locations subject to condensation as the result of severe changes in 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 ground the system to 100 Ωor less when installing the Units to protect
against electric shock.

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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 Power Supply Unit, 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.
•Interlock circuits, limit circuits, and similar safety measures in external circuits
(i.e., not in the Programmable Controller) must be provided by the customer.
•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 mount a CVM1D Power Supply Unit in a CVM1 or CV-series PC. Doing
so may result in burning or malfunction.
•Do not mount a CVM1 or CV-series Power Supply Unit on a Duplex CVM1D
PC. Doing so may result in unexpected stoppage of the PC.
•Do not apply voltages to the Input Units in excess of the rated input voltage.
Excess voltages may result in burning.
•Do not apply voltages or connect loads to the Output Units 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.
•Leave the label attached to the Unit when wiring. Removing the label may re-
sult in malfunction.
•Remove the label after the completion of wiring to ensure proper heat dissipa-
tion. Leaving the label attached may result in malfunction.
•Use crimp terminals for wiring. Do not connect bare stranded wires directly to
terminals. Connection of bare stranded wires may result in burning.
•Double-check all the wiring before turning on the power supply. Incorrect wir-
ing may result in burning.
•Mount the Unit only after checking the terminal block completely.
•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.

6Conformance to EC Directives
xv
•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.
•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.
•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 built-up. Not doing so may result in malfunction or
damage.
6 Conformance to EC Directives
The CVM1D PCs conform to EMC and Low Voltage Directives as follows:
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 confirmed 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).
The CVM1D, CVM1, and CV-series PCs that comply with EC Directives must be
installed as follows:
1, 2, 3... 1. The CVM1D, CVM1, and CV-series PCs are designed for installation inside
control panels. All PCs must be securely grounded within control panels.
2. Use reinforced insulation or double insulation for the DC power supplies
used for the communications power supply and I/O power supplies.
3. The CVM1D, CVM1, and CV-series PCs that comply with EC Directives also
conform to the Common Emission Standard (EN50081-2). Radiated emis-
sion characteristics (10-m regulations) may vary depending on the configu-
ration of the control panel used, other devices connected to the control
panel, wiring, and other conditions. You must therefore confirm that the
overall machine or equipment complies with EC Directives.

6Conformance to EC Directives
xvi
Precautions Regarding Relay Output Switching:
Noise generated by the switching of relay outputs may exceed the standards of
the Common Emission Standard (EN50081-2). In this case, take the necessary
countermeasures to reduce the emissions, such as connecting a surge sup-
pressor or shielding the PC. Some methods of reducing emissions are shown
below.
Countermeasures are required when the load switching frequency of the overall
PC exceeds 5 times/minute. Refer to 3-8 Compliance with EC Directives in the
CVM1D Installation Guide for examples of circuits that can be used to reduce
noise generated by switching.

1
SECTION 1
Introduction
This section gives a brief overview of the history of Programmable Controllers and explains terms commonly used in
ladder-diagram programming. It provides an overview of the process of programming and operating a PC and explains
basic terminology used with OMRON PCs. It also describes the Programming Devices that can be used and provides a
list of related FA products and manuals.
1-1 Overview 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Relay Circuits: The Roots of PC Logic 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3 PC Terminology 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4 OMRON Product Terminology 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5 Overview of PC Operation 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-6 PC Operating Modes 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-6-1 Operating Modes 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-6-2 RUN Output 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-7 Programming Devices 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-7-1 Compatible Programming Devices 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-7-2 Connecting Programming Devices 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-7-3 Transferring Programs 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-7-4 Recommended Programming Device Operations 8. . . . . . . . . . . . . . . . . . . . . . . . .
1-8 CVM1D Program Memory 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-9 Related Manuals 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2
1-1 Overview A PC (Programmable Controller) is basically a CPU (Central Processing Unit)
containing a program and connected to input and output (I/O) devices. The pro-
gram controls the PC so that when an input signal from an input device turns ON
or OFF, the appropriate response is made. The response normally involves turn-
ing ON or OFF an output signal to some sort of output device. The input devices
could be photoelectric sensors, pushbuttons on control panels, limit switches, or
any other device that can produce a signal that can be input into the PC. The
output devices could be solenoids, indicator lamps, relays turning on motors, or
any other devices that can be activated by signals output from the PC.
For example, a sensor detecting a passing product turns ON an input to the PC.
The PC responds by turning ON an output that activates a pusher that pushes
the product onto another conveyor for further processing. Another sensor, posi-
tioned higher than the first, turns ON a different input to indicate that the product
is too tall. The PC responds by turning on another pusher positioned before the
pusher mentioned above to push the too-tall product into a rejection box.
Although this example involves only two inputs and two outputs, it is typical of the
type of control operation that PCs can achieve. Actually even this example is
much more complex than it may at first appear because of the timing that would
be required, i.e., “How does the PC know when to activate each pusher?” Much
more complicated operations are also possible.
To achieve proper control, CVM1D PCs use a form of PC logic called ladder-dia-
gram programming. A single ladder-diagram program is used, as in C-series
PCs. CVM1D PCs cannot use SFC programs.
1-2 Relay Circuits: The Roots of PC Logic
PCs historically originate in relay-based control systems. And although the inte-
grated circuits and internal logic of the PC have taken the place of the discrete
relays, timers, counters, and other such devices, actual PC operation proceeds
as if those discrete devices were still in place. PC control, however, also pro-
vides computer capabilities and accuracy to achieve a great deal more flexibility
and reliability than is possible with relays.
The symbols and other control concepts used to describe PC operation also
come from relay-based control and form the basis of the ladder-diagram pro-
gramming method. Most of the terms used to describe these symbols and con-
cepts, however, have come in from computer terminology.
Relay vs. PC Terminology The terminology used throughout this manual is somewhat different from relay
terminology, but the concepts are the same.
The following table shows the relationship between relay terms and the PC
terms used for OMRON PCs.
Relay term PC equivalent
contact input or condition
coil output or work bit
NO relay normally open condition
NC relay normally closed condition
Actually there is not a total equivalence between these terms. The term condi-
tion is only used to describe ladder diagram programs in general and is specifi-
cally equivalent to one of a certain set of basic instructions. The terms input and
output are not used in programming per se, except in reference to I/O bits that
are assigned to input and output signals coming into and leaving the PC. Nor-
mally open conditions and normally closed conditions are explained in 4-3 Basic
Ladder Diagrams.
Relay Circuits: The Roots of PC Logic Section 1-2