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MELSEC-QnA
13 TROUBLESHOOTING
13.4.5 When power supply to a remote I/O station is turned off
Data link is continued excluding that remote I/O station.
"ERR." LEDs at the master station and the local station flash.
Power
supply
Local
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
Master
station
Stabilized power
supply (24VDC)
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.
................. 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.
Stabilized power
supply (24VDC)
Remote device
station
Remote I/O
station
Terminating
resistor
Because data link
is disabled at one
station (Turned off
if the remote I/O
station is set as an
invalid station by
the parameter.)
Because data link
is disabled at one
station (Turned off
if the remote I/O
station is set as an
invalid station by
the parameter.)
Programmable
controller CPU
Programmable
controller CPU
13.4.6 When the power supply to a remote device station is turned off
Data links is continued excluding that remote device station.
The "ERR." LEDs at the master station and the local station flash.
Power
supply
Local
station
Terminating
resistor
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
ERR.
Because data link
is disabled at one
station (Turns off if
the remote device
station is set as an
invalid station by
the parameter.)
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.
................. 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.
Stabilized power
supply (24VDC)
Because data link
is disabled at one
station (Turns off if
the remote device
station is set as an
invalid station by
the parameter.)
Remote I/O
station
Remote device
station
Programmable
controller CPU
Programmable
controller CPU