6. TROUBLESHOOTING
MELSEC-A
6-4
6.6
When There is a Communication Error between Master Station
and AJ65BT-68TD
If the station number duplicate bit is turned on in the link special register SW0098 to SW009B
(duplicate station number status), check the corresponding station number of AJ65BT-68TD using the
following flow.
Troubleshooting flow when "ERR" LED of master station is flickering
"ERR." LED of master
station flickers
Do the
parameter setting
and loading system
configuration
match?
Is the station
number switch set
correctly?
Is the
master station
link special register
SW0080 to SW0083 (other
station data link
status) turned
ON?
Y
N
N
Y
Y
Y
Is the
master station
link special register
SW0098 to SW009B
(duplicate station
number status)
turned ON?
Master station failure
N
Set the station number
switch correctly
Restart the power supply/
Turn on the reset switch
N
N
Correct parameter setting or
loading system configuration
Check the module whose
SW0098 to SW009B is ON
Check the module whose
SW0080 to SW0083 is ON
Y
Is the supplied
voltage within the
specified range?
Y
Corresponding module failure
Corresponding module failure
Corresponding module failure
Set the supplied voltage
within the specified range
Y
Correct the wiring of
communication cables
Is power supply
turned ON?
Is "POWER"
LED lit?
Y
Y
Is "RD" LED lit?
N
N
N
Are
communication
cables connected
correctly?
*1
N
Turn the power ON
To the next page
To the next page
To the next page
Check on the master side
Check on the AJ65BT-68TD side
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