Flowchart For When The "Err." Led Turns On Or Flashes - Mitsubishi MELSEC User Manual

12
TROUBLESHOOTING

12.2.7 Flowchart for when the "ERR." LED turns on or flashes

The following shows the flowchart for when the "ERR." LED of the CPU module turns on or
flashes at of the programmable controller power-on, at operation start or during operation.
The "ERR." LED is on/flashing.
Confirm details of the error by GX
Developer. (Perform PLC diagnostics.)
Can PLC diagnostics be
performed?
YES
Set the RUN/STOP/RESET switch
to STOP.
Is "UNIT MODULE ERROR"
occurring?
NO
Is "CONTROL-BUS
ERROR" occurring?
NO
Modify error details according to
PLC diagnostics.
Reset the CPU module by the
RUN/STOP/RESET switch.
Set the RUN/STOP/RESET switch
to RUN.
NO
Does the "ERR."
LED turn off?
YES
Completed
12.2.7 Flowchart for when the "ERR." LED turns on or flashes
NO
YES
(1) Flowchart for when "MODULE
VERIFY ERROR" occurs
YES
(2) Flowchart for when
"CONTROL-BUS ERROR"
occurs
12.2 Troubleshooting Flowchart
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10
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12
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