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MELSEC-GOT
7 TROUBLESHOOTING
7.3 Communication Error Occurs between Master Station and GOT
If any repeated station number bit in any of the link special registers SW0098 to
SW009B (repeated station number status) switches on, check the GOT of the
corresponding station number in the following flowchart.
Troubleshooting flowchart used when the "ERR" LED of the Master station flickers
"ERR" LED of master station flickers
Parameter
setting match system
configuration?
Any of Master
station link special registers
SW0080 to SW0083 (other
station data link status)
ON?
Any of Master
station link special registers
SW0098 to SW009B (repeated
station number status)
ON?
Check the module corresponding
to the bit switched on.
Correct parameter setting
or system configuration.
Master station faulty
Station number switch
setting correct?
Correct station number switch setting.
Switch power on again
or turn on reset switch.
Corresponding module faulty
Check the module corresponding
to the bit switched on.
Power on?
"POWER" LED lit?
"RD" LED lit?
Switch power on.
Is supply voltage
within specified range?
Communication cable
wired correctly*1?
Corresponding module faulty
Corresponding module faulty
Set supply voltage to
within specified range.
Correct communication cable wiring.
To next
p
a
g
e To next
p
a
g
e To next
p
a
g
e
Y
N
Y
N
Y
N
Y
N
Y
N
Y
N
Y
N
Y
N
Y
N
Master side check
GOT side check