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12 TROUBLESHOOTING
MELSEC-ST
12.1.3 When RUN LED of slice module (excluding intelligent function module) is flickering
(1s interval)
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
ERR
RUN
ERR
RUN
ERR
RUN
ERR
RUN LED of one
module flickering
(1s interval)
NO
NO
YES
YES
RUN LED flickering (1s interval)
Change the slice module whose
RUN LED is flickering (1s interval).
Has the RUN LED turned on?
Completed
Has the RUN LED turned on?
Change the base module of the
slice module whose RUN LED is
flickering (1s interval).
Possible cause is excessive noise.
Connect CR or similar surge
suppressor to noise source.
Summary of Contents for MELESEC-ST
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Page 114: ...10 22 10 22 10 MOUNTING AND INSTALLATION MELSEC ST MEMO...
Page 125: ...11 11 11 11 11 EMC AND LOW VOLTAGE DIRECTIVE MELSEC ST MEMO...
Page 163: ...Index 2 Index 2 MEMO Ind...
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