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MELSEC-
A
14 TROUBLESHOOTING
14.1 Troubleshooting when the "ERR" LED on the Master Module is Flashing
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The "ERR" LED on the
master station is flashing
Are the
parameter setting
and loading system
configuration
compatible?
Are the
master station
link special registers
SW0080 to SW0083
(other station data
link status)
on?
Y
N
Y
Y
Y
Check the modules whose
SW0098 to SW009B are on.
Are the station
number switches
set correctly?
Malfunction of the
corresponding module
Malfunction of
the master station
Master station
malfunction
Set the station number
switches correctly.
Reset the power supply/
press the reset switch.
Check the modules whose
SW0080 to SW0083 are on.
Is the power
supply on?
Is the "POWER"
LED on?
Is the "RD" LED on?
Turn on the power supply.
Is the supplied
voltage within the
specified range?
Set the supplied voltage
within the specified range.
Is the
communication cable
correctly installed?
*1
Wire the communication
cable correctly.
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Malfunction of the
corresponding module
Malfunction of the
corresponding module
Are the
master station
link special registers
SW0098 to SW009B
(station overlap
status) on?
N
N
Y
Y
N
Y
N
Y
N
Y
N
N
N
Check the master side.
Check the slave station side