11 TROUBLESHOOTING

MELSEC-Q

11.2.12 Flowchart for when output load of output module does not turn on

The following shows the flowchart to be followed when the output load of the output module does not turn on during PLC operation.

The output load does not turn on.

Is the operation

indicator of output module

turned on?

YES

Is voltage for the power supply load added?

YES

What is the voltage

among the various output

COM terminals of the

output module?

Is it reaching the supply voltage value?

Output module failure Replace the output module.

Confirm rush current when the load is at the maximum simultaneous on.

OK

NO Check output conditions with the monitor mode of the GX Developer.

NO

Is the operation

Off

indicator of input module

 

 

 

 

 

 

 

 

turned on?

 

 

 

 

 

 

On

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0V

 

Set the GX Developer in the monitor

 

 

 

 

 

 

mode and check that the input signal

 

 

 

 

 

 

(Monitor signal off)

 

 

 

is OFF.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check the power supply load wire

 

 

 

 

 

 

 

 

 

 

 

 

 

and recover the power supply.

 

 

 

 

 

 

 

 

 

Check the load wire and load, and recover the power supply.

NG

 

Change the output relay number and

 

 

 

 

let the load maximum simultaneous

 

 

 

 

 

 

on current to within the specification.

 

Voltage measurement among the modules input and COM terminals.

0V

Supply voltage

Check the external wiring and external input devices.

Please consult your local Mitsubishi service center or representative, explaining a detailed description of the problem.

POINT

For the trouble that the input signal to the input module is not turned off, troubleshoot referring to Section 11.5 Examples of I/O Modules Troubleshooting.

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