Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 468

APPENDICES
No. Name
2
SW008C
(140)/
SW008D
Power supply status of
(141)/
each station
SW008E
(142)/
SW008F
(143)/
SW0090
Loopback information
(144)
2
SW0091
(145)/
SW0092
Forward loop status of
(146)/
each station
SW0093
(147)/
SW0094
(148)
2: Valid only when the SB0047 is off. When it turns on (error), the last data are retained.
App - 29
Table 4 Link special register (SW) list (continued)
Description
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
b15 b14 b13 b12
SW008C 16 15 14 13
SW008D 32 31 30 29
SW008E 48 47 46 45
SW008F 64 63 62 61
Stores the loop status of the host.
0: Loop normal
1: Forward loop error
2: Reverse loop error
3: Loopback
4: Data linking disabled
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.
b15 b14 b13 b12
SW0091
16 15 14 13
SW0092 32 31 30 29
SW0093 48 47 46 45
SW0094 64 63 62 61
to b4 b3 b2 b1 b0
to 5 4 3 2 1
to 21 20 19 18 17
to 37 36 35 34 33
to 53 52 51 50 49
Numbers 1 to 64 in the above table
indicate the station numbers.
to b4 b3 b2 b1 b0
5 3
to 4 2 1
to 21 20 19 18 17
34
to 37 36 35 33
to 53 52 51 50 49
Numbers 1 to 64 in the above table
indicate the station numbers.
[Availability column] Loop: optical loop, Bus: coaxial/twisted bus
MELSEC-Q
Use permitted/prohibited
Remote
Control Normal
master
station station
station
Loop Bus Loop Bus Loop
: Available,
Remote I/O
station
Bus Loop Bus
: Not available
App - 29