26
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 PLCs 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 PLCs are equipped with these 24-VDC power output terminals to
supply power to input devices. (AC-type PLCs only.)
5. Input Terminals
Connect to the input circuits.
6. Output Terminals
Connect to the output circuits.
7. PLC Status Indicators
These indicators show the operating status of the PLC, as shown in the fol-
lowing table.
Indicator
Status
Meaning
PWR (green)
ON
Power is being supplied to the PLC.
PWR (green)
OFF
Power isn’t being supplied to the PLC.
RUN (green)
ON
The PLC is operating in RUN or MONITOR
mode.
OFF
The PLC is in PROGRAM mode or a fatal error
has occurred.
ERR/ALARM
(red)
ON
A fatal error has occurred. (PLC operation
stops.)
(red)
Flashing A non-fatal error has occurred. (PLC operation
continues.)
OFF
Indicates normal operation.
COMM (orange)
ON
Data is being transferred via the Peripheral Port.
COMM (orange)
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
error, or system error
The indicators will change with the
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 PLC to a Peripheral Device, RS-232C Adapter, or RS-422
Adapter.
12. Expansion I/O Module Connector
Connects the PLC’s CPU Unit to an Expansion I/O Module to add another 12
input points and 8 output points. Up to 3 Expansion I/O Modules can be con-
nected.
Unit Components
Section 2-2
Summary of Contents for CPM1A-20CAR-A
Page 3: ...ii...
Page 5: ...iv...
Page 9: ...iv...
Page 29: ...14 System Configuration Section 1 2...
Page 43: ...29 Unit Components Section 2 2...
Page 65: ...51 Wiring and Connections Section 3 4...
Page 123: ...Appendix B Dimensions 2 CPM1 CIF01 90 81 21 30 205 50 56 CPM1 CIF11 90 81 21 30 205 50 61...
Page 124: ...Appendix B Dimensions 3 Dimensions with Peripheral Devices Attached Approx 90 Approx 125...
Page 125: ...Appendix B Dimensions 4...
