When "L Err." Led Lights Up - Mitsubishi MELSEC-Q Series User Manual

6 TROUBLESHOOTING

6.4.3 When "L ERR." LED Lights Up

"L ERR." LED of remote I/O
station lights up (blinks)
Has switch setting
been changed after
power on?
Any line problem? *1
Consult local servicing
company, dealer or our
branch office.
*1: Check for short circuit, inverse connection, cable break, excessive pressure to a cable, terminating resistor,
overall extended length, drop line length (overall length, longest drop length) and peripheral environment
(such as noise).
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YES (Changed)
Restore switch to previous
setting
NO (Not changed)
YES (Problem identified)
Correct communication
cable wiring
NO (No problem)
MELSEC-Q
END
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