Omron CPM1A User Manual

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The following diagram shows the wiring in the RS-422 cables used to connect
CPM1A PCs to a 3G2A9-AL004-E Link Adapter. In both the Link Adapter/
RS-422 Adapter connections and the RS-422 Adapter/RS-422 Adapter connec-
tions, connect the SG, RDA, RDB, SDA, and SDB terminals to the same termi-
nals in the other Adapter.
25-pin D-sub Connector
Use a straight RS-232C
cable to connect to the
host computer’s
RS-232C port.
9-pin D-sub Connector
Signal
Pin no.
1
2
3
4
5
6
7
8
9
RDB
–
SG
–
SDB
RDA
FG
–
SDA
3G2A9-AL004-E Link Adapter
RS-422 Adapter
SG
RDA
RDB
SDA
SDB
CPM1A CPU Unit
Note 1. The maximum length of the RS-422 cable should be 500 m.
2. Set the termination resistance switch to “ON” (upper side) for Adapters on
both ends of the Host Link system.
Always use crimp connectors when wiring the RS-422 Adapters. Use M3 termi-
nal screws and tighten the screws securely to the torque of 0.5 N  m.
6.2 mm max.
Fork terminal
6.2 mm max.
Ring terminal
Wiring and Connections
Section 3-4

Omron CPM1A Specifications

General

Model	CPM1A
Type	Compact PLC
Communication Ports	RS-232C (optional)
Instruction Set	Basic and advanced instructions
Operating Temperature	0 to 55°C
Storage Temperature	-20 to 75°C
Humidity	10% to 90% RH (non-condensing)
Power Supply	24 VDC or 100-240 VAC
Expansion	Expansion I/O units available
Timers	128
Counters	256 counters
I/O Points	10, 20, 30, or 40 points (depending on model)

Summary

Application Considerations

Suitability for Use

PRECAUTIONS

Intended Audience

General Precautions

Safety Precautions

Details critical safety warnings for handling PC units, power, and external circuits.

Operating Environment Precautions

Advises on suitable locations and environmental conditions for PC operation to ensure longevity.

Application Precautions

SECTION 1 Introduction

CPM1A Features and Functions

Describes the CPM1A's key features, I/O capacity, input/output functions, and communication capabilities.

System Configuration

SECTION 2 Unit Specifications and Components

Specifications

Provides general, I/O, and communications adapter specifications for CPM1A units.

Unit Components

Identifies and describes components of CPU, Expansion I/O, Analog, Sensor, CompoBus/S, DeviceNet, and Adapter units.

SECTION 3 Installation and Wiring

Design Precautions

Covers essential precautions for designing a CPM1A system, including power wiring and interlocks.

Selecting an Installation Site

CPM1A Installation and Expansion Unit Connection

Details CPM1A orientation, mounting, and connecting expansion units correctly.

Wiring and Connections

Provides guidelines and diagrams for power, input, output, and communication wiring.

SECTION 4 Using Peripheral Devices

Using a Programming Console

Programming Console Operations

SECTION 5 Test Runs and Error Processing

Initial System Checks and Test Run Procedure

Guides on initial system checks and the CPM1A test run process.

The CPM1A Cycle and Self-Diagnosis Functions

Error Handling and Troubleshooting

Details error messages, programming errors, and troubleshooting flowcharts.

SECTION 6 Expansion Memory Unit