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MELSEC-Q
11 TROUBLESHOOTING
11.2.5 Flowchart for when the "RUN" LED is turned off
The following shows the flowchart to be followed when the "RUN" LED of the CPU
module turns off during PLC operation.
"RUN" LED is turned off.
Reset the CPU module RESET/L.
CLR switch.
Is "ERR." LED
on/flickering?
Considered to be a sequence
program error.
Check the program and modify the
program error location.
(1) PLC part/connection fault
(2) By excessive noise
Proceed to Section 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.
Connect a surge protector circuit
such as CR to the noise source.
YES
NO
"RUN" LED
is on.
"RUN" LED is off.
For the case of (1) For the
case of (2)
"RUN" LED does
not turn on.
"RUN" LED is on.
Completion
Can "RUN" LED
be turned on?
YES
NO
Set the CPU module's RUN/STOP
switch to STOP and write END to
address 0 with the GX Developer.
Set the RUN/STOP switch to RUN
and enter to the monitor mode with
the GX Developer to be operated.
Is the "POWER" LED of
the power supply module lit?
Proceed to Section 11.2.4,
"Flowchart for when the "POWER"
LED is turned off."
YES
NO