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