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MELSEC-QnA
13 TROUBLESHOOTING
13.4.9 When the transmission speed is set incorrectly
This is a case where the transmission speed for the remote device station is set
incorrectly.
The "L RUN" LED for the remote device station with the incorrect transmission-speed
setting turns off.
A
J61QBT11
B
R
A
T
E
156K
625K
2.5M
5M
10M
TEST
S0
S1
S2
T
E
S
T
E
R
R
O
R
A
J61QBT11
B
R
A
T
E
156K
625K
2.5M
5M
10M
TEST
S0
S1
S2
SD
RD
T
E
S
T
E
R
R
O
R
PW L RUN L ERR.
SD
RD
SD
RD
RUN
L RUN
L ERR.
PW
SD
RD
Power
supply
Master
station
Stabilized power
supply (24VDC)
Terminating
resistor
Stabilized power
supply (24VDC)
Local
station
Power
supply
Terminating
resistor
................. indicates the "light-on" status.
................. indicates the "light-off" status.
................. indicates the "flashing" status.
................. indicates one of the "light-on",
"light-off" or "flashing" status.
RUN
ERR.
MST
S MST
LOCAL
CPU R/W
SW
M/S
PRM
TIME
LINE
L RUN
L ERR.
RUN
ERR.
MST
S MST
LOCAL
CPU R/W
SW
M/S
PRM
TIME
LINE
L RUN
L ERR.
Remote I/O
station
Remote device
station
Programmable
controller CPU
Programmable
controller CPU
13.4.10 When the switch setting is changed during data link
This is a case where the switch setting for the remote I/O station was changed.
The "L ERR." LED for the remote I/O station whose switch setting was changed
flashes. However, data link can be continued. Also, if returned to the previous state,
"L ERR." turns off.
A
J61QBT11
B
R
A
T
E
156K
625K
2.5M
5M
10M
TEST
S0
S1
S2
T
E
S
T
E
R
R
O
R
A
J61QBT11
B
R
A
T
E
156K
625K
2.5M
5M
10M
TEST
S0
S1
S2
SD
RD
T
E
S
T
E
R
R
O
R
PW L RUN
L ERR.
SD
RD
SD
RD
RUN
L RUN
L ERR.
PW
SD
RD
Power
supply
Master
station
Stabilized power
supply (24VDC)
Terminating
resistor
Stabilized power
supply (24VDC)
Local
station
Power
supply
Terminating
resistor
................. indicates the "light-on" status.
................. indicates the "light-off" status.
................. indicates the "flashing" status.
................. indicates one of the "light-on",
"light-off" or "flashing" status.
RUN
ERR.
MST
S MST
LOCAL
CPU R/W
SW
M/S
PRM
TIME
LINE
L RUN
L ERR.
RUN
ERR.
MST
S MST
LOCAL
CPU R/W
SW
M/S
PRM
TIME
LINE
L RUN
L ERR.
Remote I/O
station
Remote device
station
Programmable
controller CPU
Programmable
controller CPU