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MELSEC-Q
11 TROUBLESHOOTING
11.2.6 When the "RUN" LED is flickering
If the "RUN" LED flickers, follow the steps below.
The High Performance model QCPU flickers the "RUN" LED when the RUN/STOP
switch is set from STOP to RUN after the programs or parameters are written in the
CPU module during the stoppage.
Though this is not the trouble with the CPU module, the operation of the CPU module
is stopped.
To bring the CPU module into RUN status, reset the CPU module with the
RESET/L.CLR or set the RUN/STOP switch again from STOP to RUN.
The "RUN" LED turns on.
11.2.7 Flowchart for when the "ERR." LED is on/flickering
The following shows the flowchart to be followed when the "ERR." LED of the CPU
module turns on or flickers at PLC power-on, at operation start or during operation.
"ERR." LED is on/flickering.
Confirm details of error by
GX Developer.
(Refer to Section 11.3.)
Set the RUN/STOP switch to STOP.
Modify error details.
(Refer to Section 11.3.)
Can the "ERR." LED
be turned off?
Reset by the RESET/L. CLR switch.
Set the RUN/STOP switch to RUN.
Completion
Hardware fault
NO
YES
Please consult your local Mitsubishi
service center or representative,
explaining a detailed description
of the problem.