Cpu Unit Errors; Errors And Remedies; Checking Errors; Checking The Indicators - Omron CJ2 CPU UNIT User Manual

6 Troubleshooting
6-1

CPU Unit Errors

6-1-1

Errors and Remedies

Use the following procedure when an error occurs.
Error occurs.
Check the indicators.
Identify the error.
Implement
countermeasures.
End
6-1-2

Checking Errors

The type of error that occurred can be determined by checking the indicators on the front of the CPU
Unit or by using the CX-Programmer. For details on error types, refer to 6-1-6 Types of Errors.

Checking the Indicators

Indicators on front of
CPU Unit
RUN
ERR/ALM
INH
PRPHL
COMM
BKUP
Power Supply Unit
6-2
Check the indicators on the front of the CPU Unit
and Power Supply Unit, or use the
CX-Programmer to read the error status.
Identify the error from the indicators
(refer to 6-1-6 Types of Errors) or use the
CX-Programmer to read the error status.
Take measures to eliminate the error that occurred
and to prevent it from occurring again.
(Refer to 6-1-7 Handling Errors.)
RUN:
ERR/ALM:
INH:
PRPHL:
COMM*:
BKUP:
* The CJ2M-CPU3@ does not have this indicator.
POWER:
Power indicator
Lit green when the PLC is in RUN or MONITOR mode.
Shows the results of self-diagnosis.
Flashing red: Non-fatal error
Lit red: Fatal error
Lit yellow when Output OFF Bit has been turned ON.
Flashing yellow when the CPU Unit is communicating through
the peripheral (USB) port.
Flashing yellow when the CPU Unit is communicating through
the RS-232C (USB) port.
Flashing yellow when data is being backed up from RAM to
built-in flash memory.
Lit when 5 V is output from the Power Supply Unit.
CJ2 CPU Unit Hardware User's Manual