User`s manual

Troubleshooting Troubleshooting
11 – 12
11.2.9 When the RUN LED is flickering
When the programs or parameters are written into the CPU module during the STOP status and
then the RUN/STOP switch* is set from STOP to RUN, the RUN LED of the CPU module flickers.
Although this status does not mean the CPU module error, the CPU module stops the operation.
Reset the CPU after changing the program or parameters in STOP mode. Afterwards select the
RUN mode by setting the RUN/STOP switch* to RUN.
If the CPU should restart without reset, after changing the program or parameters in STOP
mode, set the RUN/STOP switch* from STOP to RUN, afterwards to STOP and then again to
RUN.
11.2.10 When the ERR. LED has turned on or is flickering
* For the Basic model QCPU, use the RUN/STOP/RESET switch for operation.
ERR. LED is on/flickering
Check error code and take
corresponding measures
Reset the CPU module
Set the RUN/STOP switch*
to RUN
Is ERR. LED
on/flickering?
Hardware fault
Correct error
(refer to section 11.3)
YES
NO
Please consult your local
Mitsubishi service center
or representative.
Completed
Set the RUN/STOP switch*
to STOP
Eliminate error cause
YES
NO
Error cause
Special relay
SM1 on?
Can error be
corrected?
YES
NO