Mitsubishi Electronics QSPCU Manual De Usuario

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12.2.5  Flowchart for when the "RUN" LED turns off

The following shows the flowchart for when the "RUN" LED of 
the CPU module turns off during operation of the programmable controller.

YES

NO

The "RUN" LED has turned off.

Completed

Does the "RUN" LED 

turn on?

How 

is the "POWER" 

LED of the power supply 

module?

Is the "ERR." LED 

on/flashing?

Off

On

Section 12.2.3 Flowchart for when 
the "POWER" LED turns off

Section 12.2.7 Flowchart for when 
the "ERR." LED is on/flashing

YES

YES

NO

Reset the CPU module 
RUN/STOP/RESET switch.

Set the CPU module 
RUN/STOP/RESET switch to STOP.

Write END to sequence step 0 with 
GX Developer.

Set the CPU module 
RUN/STOP/RESET switch to RUN.

Is the 

operation monitored 

by GX Developer 

possible?

Possible cause is a sequence 
program error.

Check the program and modify 
the program error location.

Has 

measures been 

taken against noise?

Take measures against noise.

Possible cause is a 

programmable 

controller part fault/poor connection.

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

NO

YES

NO

Replace the CPU module.