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14
TROUBLESHOOTING
14.1 Troubleshooting when the "ERR" LED on the Master Module is Flashing
The "ERR" LED on the
master station is flashing
Are the
parameter setting
and loading system
configuration
compatible?
Y
Are the
master station
link special registers
SW0080 to SW0083
(other station data
link status)
on?
Y
Are the
master station
link special registers
SW0098 to SW009B
(station overlap
status) on?
Y
Check the modules whose
SW0098 to SW009B are on.
Are the station
number switches
set correctly?
Y
Malfunction of the
corresponding module
N
Malfunction of
the master station
N
Master station
malfunction
N
Check the modules whose
SW0080 to SW0083 are on.
N
Set the station number
switches correctly.
Is the "POWER"
Reset the power supply/
press the reset switch.
Is the "RD" LED on?
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N
Is the power
supply on?
Turn on the power supply.
Y
N
LED on?
Y
N
Y
Is the
communication cable
correctly installed?
*1
Y
Malfunction of the
corresponding module
14 - 2
MELSEC-A
Check the master side.
Check the slave station side
Is the supplied
N
voltage within the
specified range?
Y
Set the supplied voltage
within the specified range.
Malfunction of the
corresponding module
N
Wire the communication
cable correctly.
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Chapters
Troubleshooting
