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MELSEC-A
6 TROUBLESHOOTING
Are the
station number
setting switches properly
(not overlapping with
other stations)?
Set the station number
setting switches properly
Set the correct transmission speed
Is the transmission speed
setting correct?
Corresponding module malfunction
( Transmission speed setting switch )
Is the communication
cable wired properlly ?
*1
1 2 3
N
N
N
Y
Is the "L RUN" LED lit?
N
Turn on the power again
Turn on the power again
Wire the communication
cable properly
Are the
station number
setting switches properly
(not overlapping with
other stations)?
Set the station number
setting switches properly
Corresponding module malfunction
( station number setting switch )
End
Turn on the power again
Y
Y
Y
Y
N
*1 Check for a short, reversed connection, wire breakage, terminal resistor, FG connection,
overall distance and station-to-station distance.