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MELSEC-QnA
13 TROUBLESHOOTING
13.4 LED Display Status
The LED display status of each station for each data-link (system) status is shown
below, where the transmission speed is set at 2.5 Mbps.
Refer to Troubleshooting.
13.4.1 When data link is normal
The "PW", "RUN", "L RUN", "SD" and "RD" LEDs are on.
................. indicates the "light-on" status.
................. indicates the "light-off" status.
................. indicates the "flashing" status.
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
RUN
ERR.
MST
S MST
LOCAL
CPU R/W
SW
M/S
PRM
TIME
LINE
L RUN
L ERR.
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
................. indicates one of the "light-on",
"light-off" or "flashing" status.
Programmable
controller CPU
Master
station
Stabilized power
supply (24VDC)
Stabilized power
supply (24VDC)
Local
station
Power
supply
Terminating
resistor
Terminating
resistor
Remote I/O
station
Remote device
station
RUN
ERR.
MST
S MST
LOCAL
CPU R/W
SW
M/S
PRM
TIME
LINE
L RUN
L ERR.
Programmable
controller CPU
13.4.2 When a cable is disconnected
Data link for all the stations is lost.
You cannot identify the location of wire breakage by the LED indications.
Remote I/O
station
Stabilized power
supply (24VDC)
Remote device
station
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
Programmable
controller CPU
Master
station
Stabilized power
supply (24VDC)
................. 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.
Disconnected
Local
station
Power
supply
Terminating
resistor
Terminating
resistor
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.
Programmable
controller CPU