When The "Run" Led Is Flickering; Flowchart For When The "Err." Led Is On/Flickering - Mitsubishi MELSEC- Q Q12PHCPU User Manual

11 TROUBLESHOOTING

11.2.6 When the "RUN" LED is flickering

11.2.7 Flowchart for when the "ERR." LED is on/flickering

Please consult your local Mitsubishi
service center or representative,
explaining a detailed description
of the problem.
11 - 7
If the "RUN" LED flickers, follow the steps below.
The Process CPU 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.
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.
Hardware fault
"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.)
Reset by the RESET/L. CLR switch.
Set the RUN/STOP switch to RUN.
Can the "ERR." LED
be turned off?
YES
Completion
MELSEC-Q
NO
11 - 7