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MELSEC-QnA
13 TROUBLESHOOTING
Complete
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e
Is the "L RUN"
LED on?
Is the "SD" LED
on (flashing)?
Y
N
Is the "SD" LED
on (flashing)?
Is the baud rate
setting correct?
Malfunction of the
corresponding
module
Set the baud
rate correctly.
Reset the power supply/
press the reset switch.
Is the
communication cable
wired correctly?
1
Wire the communication
cable correctly.
Malfunction of the
corresponding module
(Baud rate switch)
Is the
station number
switch correctly set (not
overlapping with other
stations)?
Malfunction of the
corresponding module
(Station number switch)
Set the station
number correctly.
Reset the power supply/
press the reset switch.
Are the
station number
switches set correctly (not
overlapping with other
stations)?
Set the station
number correctly.
Malfunction of the
corresponding module
(Station number switch)
Reset the power supply/
press the reset switch.
Y
N
Y
N
Y
N
Y
N
Y
N
Y
N
1 Check for a short, reversed connection, wire breakage, terminating resistor, FG connection, overall distance and
station-to-station distance.