Power Led Does Not Light On The Control Unit; Desired Output Is Not Obtained: Checking When The Output Does Not Turn On / Off - Panasonic GM1 Series Reference Manual

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Condition
The system watchdog timer has been activated and the operation of the Controller has stopped.
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Solution
1.
Set the control unit to STOP mode and restart the power supply.
If the ALARM LED lights again, there may be a problem with the unit.
If it goes out, the problem may have been caused by primary factors such as a noise.
2.
Check the surrounding environment if there is an influence of noise.
If there is no problem with the program, there might be a problem with the surrounding
environment.
Check the wiring including installation wiring.
Particularly, check if wiring to the control unit is routed too close to the power line wiring and
also check if necessary shield processing has been performed.

10.3.3 POWER LED Does not Light on the Control Unit

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Condition
It is possible that sufficient power is not supplied.
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Solution
1.
Power off the unit and double-check the wiring status. (e.g. Is there any loose terminal?)
2.
Check if the output of the power supply to the control unit does not exceed the rating.
If the 24-V power supply is not sufficient, review the power supply configuration.
Disconnect the power supply wiring to the other devices if the power supplied to the control
unit is shared with them.
10.3.4 Desired Output Is Not Obtained: Checking when the Output Does Not
Turn ON / OFF
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Condition
Both software factors such as program or I/O allocation and hardware factors such as wiring or
power supply can be assumed.
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Solution
1.
Check if the output display LED of the unit is lit.
If it is lit, proceed to the following step. If it is not lit, proceed to step 4.
2.
Recheck the wiring of the loads for loose terminals, etc.
3.
Check if proper voltage is applied to the loads.
WUME-GM1H-01
10.3 What to Do If an Error Occurs
10-5