6 Troubleshooting
6-2
CJ2 CPU Unit Hardware User’s Manual
6-1 CPU Unit Errors
Use the following procedure when an error occurs.
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.
6-1-1 Errors and Remedies
6-1-2 Checking Errors
Checking the Indicators
RUN: Lit green when the PLC is in RUN or MONITOR mode.
ERR/ALM: Shows the results of self-diagnosis.
Flashing red: Non-fatal error
Lit red: Fatal error
INH: Lit yellow when Output OFF Bit has been turned ON.
PRPHL: Flashing yellow when the CPU Unit is communicating through
the peripheral port.
COMM: Lit Flashing yellow when the CPU Unit is communicating
through the RS-232C port.
BKUP: Flashing yellow when data is being backed up from RAM to
built-in flash memory.
POWER: Lit when 5 V is output from the Power Supply Unit.
Error occurs.
Check the indicators.
Identify the error.
Implement
countermeasures.
End
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
Indicators on front of
CPU Unit
Power Supply Unit
Power indicator
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