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11. TROUBLESHOOTING
From preceding page
From preceding page
"SD" LED lit (flicker)?
switch setting correct
Corresponding module faulty
(Station number switches)
*1: Check for short circuit, reverse connection, wire breakage, no terminal resistor, improper FG connection, improper overall
distance and improper interstation distance.
N
"L RUN" LED lit?
Y
"SD" LED lit (flicker)?
N
Corresponding module faulty
Y
Station number
switch setting correct
(not repeated)?
Corresponding module faulty
(Station number switches)
Station number
N
(not repeated)?
Correct station number setting.
Y
Switch power on again
or turn on reset switch.
Complete
N
Y
Baudrate setting correct?
Y
Communication cable
wiring correct*1?
Y
Corresponding module faulty
(Baudrate switch)
N
Correct station number setting.
Y
Switch power on again
or turn on reset switch.
11 - 5
MELSEC-A
From preceding page
N
Correct baudrate setting.
Switch power on again
or turn on reset switch.
N
Correct communication cable wiring.
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