When A Communication Fault Occurs Between The Master Station And This Module - Mitsubishi Electric AJ65BT64DAV/DAI User Manual

6. TROUBLESHOOTING
(data link status of other stations)
(station number overlapping status)
Check the module whose SW0098
to SW009B is turned on.
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6.2.1 When a communication fault occurs between the master station and this
module
If the station-number-overlapping bit is turned on in the link special resister SW0098 to SW009B
(station number overlapping status), check the AJ65BT-64DAV/DAI module of the corresponding
station number by following the flow shown below:
Troubleshooting flow when the ERR LED on the master station is flashing
"ERR" LED of the
master station flashes
Do the parameter
N
settings match the actual
system configuration?
Correct parameter setting
Y
or the actual system
configuration.
Is the link special
register SW0080 to SW0083 N
of the master station
turned on?
Breakdown of the
Y
master station
Link special
N
register SW0098 to SW009B
of the master station
Y
N
Is the station number
switch properly set?
Y
Set the station number
Breakdown of the
switch correctly.
corresponding module
Turn on the power again.
Turn on the reset switch.
*1 Check the following: short-circuit,
reversed connection, cable breakage,
terminal resistor, FG connection, total
distance, and the distance between
stations.
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Check the module whose SW0080
to SW0083 is turned on.
N
Is the power
turned on?
Turn on the power.
Y
Is the
N
"POWER" LED
turned on?
Y
N
Is the "RD" LED
turned on?
Is the
Y
communication cable
wired correctly?
*1
Y
Breakdown of the
corresponding module
N
Is the "L RUN"
LED turned on?
Y
Is the "SD"
LED turned on
(flashing)?
Y
Is the
N
"SD" LED turned on
(flashing)?
Y
Breakdown of the
corresponding
module
Is the station
number switch set correctly?
(Is it overlapping another
station?)
Y
Breakdown of the corresponding
module (station number switch)
Is the station
N
number switch set correctly?
(Is it overlapping another
station?)
Set the station
Y
number correctly.
Breakdown of the corresponding
module (station number switch)
End
6-2
Check the master side.
Check the slave station side.
Is the
N
supplied voltage
within the specified
range?
Adjust the supplied voltage
Y
to within the specified range.
Breakdown of the
corresponding module
N
Wire the communication
cable correctly.
N
N
Is the baud rate
setting correct?
Set the baud
Y
rate correctly.
Turn on the power again.
Is the
N
Turn on the reset switch.
communication cable
wired correctly?
*1
Wire the communication
Y
cable correctly.
Breakdown of the
corresponding module
(baud rate switch)
N
Set the station
number correctly.
Turn on the power again.
Turn on the reset switch.
Turn on the power again.
Turn on the reset switch.
MELSEC-A
6