When Run Led Of Slice Module (Excluding Intelligent Function Module) Is Flickering (1S Interval) - Mitsubishi MELESEC-ST User Manual

12 TROUBLESHOOTING
12.1.3 When RUN LED of slice module (excluding intelligent function module) is flickering
(1s interval)
RUN LED flickering (1s interval)
Change the slice module whose
RUN LED is flickering (1s interval).
Has the RUN LED turned on?
Completed
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When the RUN LED of any slice module (excluding intelligent function module) is
flickering (1s interval), troubleshoot according to the following flowchart.
(1) When RUN LED of one slice module (excluding intelligent function
module) is flickering (1s interval)
RUN ERR RUN
NO
Change the base module of the
slice module whose RUN LED is
YES
flickering (1s interval).
Has the RUN LED turned on?
RUN LED of one
module flickering
(1s interval)
ERR RUN ERR RUN ERR RUN ERR
YES
MELSEC-ST
NO
Possible cause is excessive noise.
Connect CR or similar surge
suppressor to noise source.
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