6 - 5 6 - 5
MELSEC-A
6 TROUBLESHOOTING
6.4 Troubleshooting for the Case where the "ERR." LED of the Master Station Flickers
The "ERR"LED on the
master station is flashing
Do the parameter
setting and the installed system
configuration match
properly?
Are the master
station link special registers
SW0080 to SW0083 (other station
date link status)
turned on?
Are the master
station link special registers
SW0098 to SW009B (station
number overlap status)
turned on?
Check the module for which
SW0098 to SW009B are on
Are the
station number setting
switches set
properly?
Set the station number setting
swiches properly
Revise the parameter settings
or installed system configuration
Master station malfunction
Corresponding module
malfunction
Turn on the power again
1
3
N
N
N
Y
Y
Y
Y
Check the module for which
SW0080 to SW0083 are on
Is the power on?
Turn on the power
Is the "POWER" LED lit?
Is the supplied
power within the specified
range
Set the supplied voltage to
within the specified range
Corresponding module
malfunction
2
Check on master
station side
Check on slave
station side
N
N
Y
Y
Y
N
Are the master
station link special registers
SW0144 to SW0147 (mounting/
parameter matching status (2))
turned on?
Check the module for which
SW0144 to SW0147 are on.
Do the parameter
and module match in
CC-Link version?
Failure of the corresponding
module
Match the version of the
corresponding module and
that of the parameter.
Switch power off, then on again.
N
Y
Y
N
N
