Omron SYSMAC C20P User manual

Cat. No. W167-E1-4A
C20P/C28P/C40P/C60P
SYSMAC
Programmable Controllers

P-type Programmable Controllers
Installation Guide
Revised July 1994
C20P
C60P
C60P
C20P

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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 the product.
DANGER! Indicates information that, if not heeded, is likely to result in loss of life or serious
injury.
WARNING Indicates information that, if not heeded, could possibly result in loss of life or
serious injury.
Caution Indicates information that, if not heeded, could result in relative serious or minor
injury, damage to the product, or faulty operation.
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, 1989
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.

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TABLE OF CONTENTS
SECTION 1
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1 Nomenclature 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 System Configuration 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 2
System Installation and Wiring 13. . . . . . . . . . . . . . . . . . . . .
2-1 General 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 Installation Environment 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3 Dimensions and Installation 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4 I/O Connecting Cable 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-5 Wiring CPUs and Expansion I/O Units 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-6 I/O Wiring 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-7 Special Wiring Precautions 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-8 Switch Settings 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 3
Maintenance and Inspection 51. . . . . . . . . . . . . . . . . . . . . . .
3-1 General 52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 Self-diagnostic Functions 52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 Replacing Parts 53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 Preventive Measures 56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5 Inspection 59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendices 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Standard Models 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Specifications 67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C. Programming Instructions 73. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D. Programming Console Operations 79. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index 87. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Revision History 89. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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About this Manual:
This manual has been prepared to provide the information necessary to install, set up, and maintain
your C-series P-type Programmable Controller, a low-cost, compact, versatile industrial control sys-
tem providing up to 148 I/O points. For information regarding system programming and operation,
refer to the Operation Manual.
Analog I/O Units are also not described in detail in this manual because a separate manual is pro-
vided for them (SYSMAC K-type Analog I/O Units Operation Guide, Cat.No. W122)
Section 1 describes the basic Units that can be used to build a K-type PC, explains how the Units
can be combined, and provides example system configurations.
Section 2 covers actual system installation and wiring, including switch settings.
Section 3 provides information on maintaining your PC in good working condition.
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.

1
SECTION 1
Introduction
1-1 Nomenclature 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1-1 CPUs 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1-2 Expansion I/O Units 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1-3 Analog Timer Unit 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1-4 I/O Link Units 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 System Configuration 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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1-1 Nomenclature
This section gives the names and functions of the various components of
P-type PCs and the basic Units with which they can be combined in a
System.
1-1-1 CPUs
In the diagram below, the C28P is shown as a representative model. Refer to
Appendix A Standard Models for your model’s exact specifications.
Power supply Ground Outputs Indicators
CPU,
Expansion I/O
Unit, Analog
Timer Unit,
Analog I/O
Unit, or I/O
Link Unit
connector
24-VDC output
Peripheral connector
InputsHigh-speed counter
(HDM(98)–) inputs
EPROM socket,
DIP switch
High-speed Counter When the high-speed counter (HDM(98)) is not being used, the two
high-speed counter input terminals can be used as normal DC input termi-
nals. Their ON/OFF response time, however, will be shorter (0.15 ms max.).
Regardless of whether or not the high-speed counter command is being
used, DIP switch pins 7 and 8 must be off whenever the hardware reset is
not being used.
Indicators The diagram below shows the functions of the various indicators, taking the
C20P as an example.
8 9 10 11
0 1 2 3 4 5 6 7
OUTPUT 5 CH
POWER
RUN
ALARM
ERROR
INPUT 0 CH
OUTPUT: Shows whether the output is ON or OFF.
POWER: Stays lit while power is turned on to the
PC.
RUN: Stays lit while the PC is operating normally.
ALARM: Blinks during battery abnormality or scan
time overrun. At this time PC operation will be
intermittent.
ERROR: Lights when self-diagnosis detects an
abnormality. The PC will stop operating.
INPUT: Shows whether the input is ON or OFF.
0 1 2 3 4 5 6 7
Memory Each of the C-series P-type PCs is provided with a built-in RAM (random-ac-
cess memory), as well as a ROM (read-only memory) chip socket. Either
may be used with ease. It is recommended to use the RAM for programming
and, when the program is completed, to save it in a ROM chip for protection.
The memory capacity in either case is 1,194 addresses.
Nomenclature Section 1-1

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Beneath the cover are the DIP switch and the socket where an EPROM chip
may be installed. For details, see 2-8-1 Setting the CPU DIP Switch and
2-8-2 EPROM Installation. Only DIP switch pins 1 and 2 are on when the
CPU is delivered.
ROM socket
8 Turn ON to use hardware reset (0001).
7 Turn OFF if FUN 61 is not used.
6 Turn ON for English display.
5 Turn ON to inhibit ALARM indicator.
4, 3 ROM: ON (RAM: OFF)
2, 1 RAM: ON (ROM: OFF)
CAUTION: In case of battery failure, data stored in
the RAM, the DM area, the HR area, etc., will not be preserved.
1-1-2 Expansion I/O Units
In the diagram below, the C20P is shown as a representative model. Refer to
Appendix A Standard Models for your model’s exact specifications.
Power supply Ground Outputs Indicators
CPU,
Expansion
I/O Unit,
Analog Timer
Unit, Analog
I/O Unit, or
I/O Link Unit
connector
24-VDC outputInputsCPU left/right
selector
CPU,
Expansion
I/O Unit, or
I/O Link Unit
connector
ROM Socket and DIP
Switch
Nomenclature Section 1-1