Mitsubishi Melsec-Q Series User Manual page 313

12.2.12 When the RUN LED has turned off
Refer to the following flowchart when the RUN LED of the CPU module has turned off during operation of the
programmable controller.Note1
The "RUN" LED has turned off.
"POWER" LED of the power
Reset the CPU module RESET/L.
CLR switch.
Set the CPU module's RUN/STOP
switch
write END to address 0 with the GX
Developer.
Set the CPU module's RUN/STOP
switch
to the monitor mode with the GX
Developer to be operated.
Possible cause is a sequence
program error.
Check the program and modify the
program error location.
NO
Can "RUN" LED turn on?
*: This applies to the redundant power supply module.
Note1
Note12.7 Basic
For the Basic model QCPU, use the RUN/STOP/RESET switch for operation.
Off or
How is the
On (red)
supply module?
Turned on green
Is "ERR." LED YES
on/flickering?
NO
"RUN" LED is
on.
Note12.7
"RUN" LED is off.
Note12.7
to STOP and
"RUN" LED does
Note12.7
to RUN and enter
not turn on.
"RUN" LED is on.
YES
Completed
Figure 12.12 When the RUN LED has turned off
(When off)
Section 12.2.6
Section 12.2.5 "Flowchart for
when the "POWER" LED has
turned off."
(When on (red))
Section 12.2.8
Section 12.2.6 Flowchart for
when the "POWER" LED has
turned on (red)
Section
Section 12.2.9 "Flowchart for
when the "ERR." LED is
on/flickering."
(1) Programmable controller part
fault/poor connection between
the module and base unit
(2) Excessive noise generation
For the case of (1)
Please consult your local Mitsubishi
service center or representative,
explaining a detailed description of
the problem.
Connect a surge suppression
circuit, such as CR, to the noise
source.
CHAPTER12 TROUBLESHOOTING
For the
case of (2)
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