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MELSEC-QnA
13 TROUBLESHOOTING
13.4.7 When the power supply to the local station (programmable controller CPU) is turned
off
Data link is continued excluding the local station.
The "ERR." LED at the master station flashes.
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)
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.
Because data link
is disabled at one
station (Turns is off
if the local station is
set as an invalid
station by the
parameter.)
Remote I/O
station
Remote device
station
Programmable
controller CPU
Programmable
controller CPU
13.4.8 When the station numbers are duplicate
This is a case where the settings for a remote I/O station and a remote device station
are duplicate. A skipped number (no slave station exists) result in the system because
of overlapped station number, so the "ERR." LED on the master station flashes.
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)
Local
station
Power
supply
Terminating
resistor
Remote I/O
station
Remote device
station
Programmable
controller CPU
Programmable
controller CPU