Omron CJ1W-NC271 - 12-2009, Operation Manual

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LED Error Indicators
Section 12-3
12-3-2 Error Display for CPU Unit Errors
The indicator displays shown in the above table indicate errors that have
occurred in the CPU Unit. Check the Unit's installation status and causes for
the errors in the CPU Unit.
12-3-3 Error Display for PCU Errors
The indicator displays shown in the above table indicate that data in the PCU
is corrupted or the PCU's internal circuits have malfunction.
Data may be corrupted if the PCU power is interrupted while data is being
saved to the PCU's internal flash memory. Use PCU's SAVE DATA or the CPU
Unit's simple backup function to restore (read) data saved in the Memory Card
or perform another process to recover saved data.
If the error occurs again, the probable cause is a faulty PCU. Replace the
PCU.
Not lit Lit Not lit Not lit Not lit Unit malfunction The internal circuits of
the PCU have malfunc-
tioned.
Replace the PCU.
Not lit Lit Lit Not lit Not lit Unit recognition
error The CPU Unit has not
recognized the PCU
correctly. Replace the PCU.
Indicator status Category Probable cause of
error
Countermeasure
RUN ERC ERH ERM MLK
Lit Flashing Lit Not lit Not lit CPU Unit error The CPU Unit system
is not operating cor-
rectly. Make sure that the
CPU Unit and PCU are
installed correctly, and
turn the power OFF
and ON again. If the
error occurs again,
replace the CPU Unit.
A PLC bus operation
error has occurred.
A fatal error has
occurred in the CPU
Unit. Remove the cause of
the CPU Unit stopping.
Indicator status Category Probable cause of
error
Countermeasure
RUN ERC ERH ERM MLK
Indicator status Category Probable cause of
error
Countermeasure
RUN ERC ERH ERM MLK
Lit Lit Not lit Not lit Not lit Data corrupted The data saved in the
PCU is corrupted. Transfer and save the
PCU data again, and
then restart the Unit or
turn the power OFF
and ON again.
Unit error An error has occurred
in the internal circuits
of the PCU. Replace the PCU.