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6. TROUBLESHOOTING
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From the previous page
Is "L RUN" LED lit?
Y
Is "SD" LED lit
(flickering)?
Y
Is the
station number
switch set correctly (not
duplicated with other
station)?
Y
Corresponding module failure
(station number switch)
*1 Check for short-circuits, reversed connection, wire breakage, terminal resistor, FG connection,
overall distance and station-to-station distance.
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N
N
Is "SD" LED lit
(flickering)?
Y
Is the baud rate
setting correct?
N
Corresponding
module failure
Are the
communication
cables connected
correctly?
Corresponding module failure
(baud rate switch)
Is the
station number
N
switch set correctly (not
duplicated with other
station)?
Set the station number correctly
Y
Restart the power supply/
Turn ON the reset switch
Corresponding module failure
(station number switch)
N
Set the station number correctly
Restart the power supply/
Turn ON the reset switch
Complete
6-5
MELSEC-A
From the previous page
N
Y
Correct the baud rate setting
Restart the power supply/
Turn ON the reset switch
N
*1
Connect the communication
Y
cables correctly
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