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MELSEC-Q
11 TROUBLESHOOTING
11.2.3 Flowchart for when the "MODE" LED is flickering
The following shows the flowchart to be followed when the "MODE" LED of the CPU
module flickers at PLC power-on, at operation start or during operation.
"MODE" LED is flickering
YES
NO
Is the RESET/L.CLR
switch of the CPU module in
the neutral position?
Did you make forced
ON/OFF setting?
Neutral position
Cancel forced ON/OFF.
Hardware fault
Check operations in the order
starting from the minimum system.
If the module will not work,
please consult your local Mitsubishi
service center or representative,
explaining a detailed description
of the problem.
Is the "MODE" LED turned on?
Move the RESET/L.CLR switch to the
neutral position.
RESET position
Is the "MODE" LED turned on?
Completion
NO
NO
YES
YES