Flowchart For When The "Run" Led Turns Off - Mitsubishi Electric QS001CPU User Manual

12
TROUBLESHOOTING

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.
The "RUN" LED has turned off.
How
is the "POWER"
LED of the power supply
module?
On
Is the "ERR." LED
on/flashing?
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?
NO
Possible cause is a sequence
program error.
Check the program and modify
the program error location.
Does the "RUN" LED
turn on?
NO
Replace the CPU module.
12
- 9 12.2 Troubleshooting Flowchart
12.2.5 Flowchart for when the "RUN" LED turns off
Off
Section 12.2.3
Section 12.2.3 Flowchart for when
the "POWER" LED turns off
Section 12.2.7
YES
Section 12.2.7 Flowchart for when
the "ERR." LED is on/flashing
YES
Has
measures been
taken against noise?
Take measures against noise.
YES
Figure 12.4 Flowchart for when the "RUN" LED turns off
YES
NO
Please consult your local Mitsubishi
representative, explaining a detailed
description of the problem.
Completed
Possible cause is a programmable
controller part fault/poor connection.