Unit Components

Section 2-2

 

 

 

CPU Unit Component Descriptions

1, 2, 3... 1. Power Supply Input Terminals

Connect the power supply (100 to 240 VAC or 24 VDC) to these terminals.

2.Functional Earth Terminal ( )

Be sure to ground this terminal (AC-type PCs only) to enhance immunity to noise and reduce the risk of electric shock.

3.Protective Earth Terminal ( )

Be sure to ground this terminal to reduce the risk of electric shock.

4.Power Supply Output Terminals

CPM1A PCs are equipped with these 24-VDC power output terminals to supply power to input devices. (AC-type PCs only.)

5.Input Terminals

Connect the Unit to external input devices.

6.Output Terminals

Connect the Unit to external output devices.

7.PC Status Indicators

These indicators show the operating status of the PC, as shown in the fol- lowing table.

Indicator

Status

Meaning

 

 

 

PWR (green)

ON

Power is being supplied to the PC.

 

 

 

 

OFF

Power isn’t being supplied to the PC.

 

 

 

RUN (green)

ON

The PC is operating in RUN or MONITOR mode.

 

 

 

 

OFF

The PC is in PROGRAM mode or a fatal error

 

 

has occurred.

ERR/ALARM

ON

A fatal error has occurred. (PC operation stops.)

(red)

 

 

Flashing

A non-fatal error has occurred. (PC operation

 

 

 

continues.)

 

 

 

 

OFF

Indicates normal operation.

 

 

 

COMM (orange)

ON

Data is being transferred via the Peripheral Port.

 

 

 

 

OFF

Data isn’t being transferred via the Peripheral

 

 

Port.

8.Input Indicators

These indicators are lit when the corresponding input terminal is ON. When a fatal error occurs, the input indicators change as follows:

Fatal error

Input indicators

 

 

CPU Unit error or I/O bus error

Turn OFF.

 

 

Memory error, no END instruction

The indicators will change with the

error, or system error

status of the input signal, but input

 

status will not be updated in memory.

 

 

9.Output Indicators

These indicators are lit when the corresponding output terminal is ON.

10.Analog Controls

Setting these controls sets the contents of IR 250 and IR 251 from 0 to 200.

11.Peripheral Port

Connects the PC to a Peripheral Device, RS-232C Adapter, or RS-422 Adapter.

12.Expansion I/O Unit Connector

Connects the PC’s CPU Unit to an Expansion I/O Unit to add another 12 input points and 8 output points. Up to 3 Expansion I/O Units can be con- nected.

29

Page 42
Image 42
Omron CPM1A operation manual CPU Unit Component Descriptions, Indicator Status Meaning, Fatal error Input indicators