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MELSEC-Q
APPENDICES
Table 3 Link special register (SW) list (Continued)
No. Name Description
Availability
Control
station
Normal
station
Remote
master
station
Remote I/O
station
2
SW008C
(140)
SW008D
(141)
SW008E
(142)
SW008F
(143)
Power supply status of
each station
Indicates whether external power supply is available to each
station (For QJ71LP21-25, 0 is ON.)
Valid only for stations registered as normal in the SW0070 to
SW0073.
0: Without external power supply (Including stations reserved
or numbered greater than the maximum)
1: With external power supply
16
32
48
64
15 14 13
5
4
3
21
31 30
47 46
63 62
29
45
61
21 20 19 18 17
37 36 35
34
33
53 52 51 50 49
to
to
to
to
b15 b14 b13 b12 b4 b3 b2 b1 b0
SW008C
SW008D
SW008E
SW008F
to
Numbers 1 to 64 in the above table
indicate the station numbers.
SW0090
(144)
Loopback information
Stores the loop status of the host.
0: Loop normal
1: Forward loop error
2: Reverse loop error
3: Loopback
4: Data linking disabled
2
SW0091
(145)/
SW0092
(146)/
SW0093
(147)/
SW0094
(148)
Forward loop status of
each station
Stores the forward loop status of each station (including the
host).
0: Normal (including the station with the maximum station
number and smaller stations as well as reserved stations)
1: Abnormal
Disconnected station remains in the status when it was
disconnected.
16
32
48
64
15 14 13
5
4
3
21
31 30
47 46
63 62
29
45
61
21 20 19 18 17
37 36 35
34
33
53 52 51 50 49
to
to
to
to
b15 b14 b13 b12 b4 b3 b2 b1 b0
SW0091
SW0092
SW0093
SW0094
to
Numbers 1 to 64 in the above table
indicate the station numbers.
2: Valid only when SB0047 is off. When it turns on (error), the last data are retained.