Mitsubishi Electric A173UHCPU User Manual page 122

5. INSPECTION AND MAINTENANCE
(3) Flowchart when RUN indicator is not lit
Follow the flowchart below if the RUN indicator goes out during operation.
RUN indicator goes out
Is an
error displayed
when a peripheral device
is connected?
NO
Reset with the CPU module
RUN/STOP key switch.
RUN indicator
does not light
Set the CPU module
RUN/STOP switch to STOP.
Write END to address 0 from
a peripheral device.
Set the RUN/STOP switch to
RUN. Operate in monitor
mode from peripheral device.
RUN indicator
lights
Is sequence program
defective?
Check and correct program.
YES
RUN indicator
lights
Contact your nearest
Mitsubishi representative with
details.
RUN indicator
does not light
5 − 11
Refer to error table.
(1) Defective CPU module
part or contact.
(2) Excessive noise.
If (1)
If (2)
Connect surge suppressor
circuit (CR, etc.) to noise
source.