Mitsubishi Electronics Mitsubishi Digital Electronics Electronic Accessory Q02CPU ユーザーズマニュアル

 

 

 

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MELSEC-Q

 

11   TROUBLESHOOTING 

 

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. 

 

Check output conditions with the
monitor mode of the GX Developer.

Is the operation

indicator of input module

turned on?

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

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

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.

Check the external wiring and
external input devices.

The output load does not turn on.

Is the operation

indicator of output module

turned on?

Is voltage for the

power supply load

added?

What is the voltage

among the various output

COM terminals of the

output module?

Output module failure
Replace the output module.

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

YES

NO

NO

YES

0V

NG

OK

Is it reaching the
supply voltage
value?

On

Off

0V

(M

oni

to

r si

gnal

 of

f)

S

uppl

y vo

lt

age

Set the GX Developer in the monitor 
mode and check that the input signal 
is OFF.

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.