Flowchart For When The "Mode" Led Is Flickering - Mitsubishi MELSEC- Q Q12PHCPU User Manual

11 TROUBLESHOOTING

11.2.3 Flowchart for when the "MODE" LED is flickering

"MODE" LED is flickering
Did you make forced
ON/OFF setting?
Is the RESET/L.CLR
switch of the CPU module in
the neutral position?
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.
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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.
YES
NO
RESET position
Neutral position
Cancel forced ON/OFF.
NO
Is the "MODE" LED turned on?
Move the RESET/L.CLR switch to the
neutral position.
NO
Is the "MODE" LED turned on?
MELSEC-Q
YES
YES
Completion
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