Flowchart For When The "Mode" Led Is Not Turned On - Mitsubishi MELSEC- Q Q12PHCPU User Manual

11 TROUBLESHOOTING

11.2.2 Flowchart for when the "MODE" LED is not turned on

"MODE" LED is not turned on.
supply for all the power
supply modules turned on?
Is the wiring of the power supply
LED for the power supply module
connected properly?(Isn't IN
connected to IN or OUT
Is the CPU module
RESET/L. CLR switch 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 does not turn on at PLC power-on.
Is the power
module correct?
YES
Is the "POWER"
turned on?
YES
Is the
extension cable
connected to
OUT?)
YES
"RESET" position
Neutral position
Check the wire and turn on the
NO
power supply.
NO Can "MODE" LED
be turned on?
Exchange the power supply module,
NO
and confirm if "POWER" LED is
turned on.
NO Can "MODE" LED
be turned on?
NO
Connect the extension cable properly.
NO
Can "MODE" LED
be turned on?
Set the RESET/L. CLR switch in the
neutral position.
NO
Can "MODE" LED
be turned on?
MELSEC-Q
YES
YES
YES
YES
Completion
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