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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
Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial
2
SW00B0
(176)/
SW00B1
(177)/
SW00B2
(178)/
SW00B3
(179)
Multiplex transmission
status (1)
Stores each station’s forward loop usage status during multiplex
transmission.
0: Uses other than the forward loop
1: Uses the forward loop
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
SW00B0
SW00B1
SW00B2
SW00B3
to
Numbers 1 to 64 in the above table
indicate the station numbers.
2
SW00B4
(180)/
SW00B5
(181)/
SW00B6
(182)/
SW00B7
(183)
Multiplex transmission
status (2)
Stores each station’s reverse loop usage status during multiplex
transmission.
0: Uses other than the reverse loop
1: Uses the reverse loop
16
32
48
64
151413 54321
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
SW00B4
SW00B5
SW00B6
SW00B7
to
Numbers 1 to 64 in the above table
indicate the station numbers.
3
SW00B8
(184)
UNDER on the forward
loop side/coaxial bus
UNDER
Accumulates and stores the number of "UNDER" errors on the
forward loop side for the optical loop, or the number of "UNDER"
errors of the coaxial bus for the coaxial bus.
Other than 0: Number of errors
Turning ON Clear communication error count (SB0006) clears
the stored value.
3
SW00B9
(185)
CRC on the forward loop
side/coaxial bus CRC
Accumulates and stores the number of "CRC" errors on the
forward loop side for the optical loop, or the number of "CRC"
errors of the coaxial bus for the coaxial bus.
Other than 0: Number of errors
Turning ON Clear communication error count (SB0006) clears
the stored value.
3
SW00BA
(186)
OVER on the forward
loop side/coaxial bus
OVER
Accumulates and stores the number of "OVER" errors on the
forward loop side for the optical loop, or the number of "OVER"
errors of the coaxial bus for the coaxial bus.
Other than 0: Number of errors
Turning ON Clear communication error count (SB0006) clears
the stored value.
3
SW00BB
(187)
Short frame on the
forward loop side/coaxial
bus short frame
Accumulates and stores the number of "short frame" errors on
the forward loop side for the optical loop, or the number of "short
frame" errors of the coaxial bus for the coaxial bus.
Other than 0: Number of errors
Turning ON Clear communication error count (SB0006) clears
the stored value.
3
SW00BC
(188)
Abort on the forward loop
side (AB, IF)/coaxial bus
abort (AB. IF)
Accumulates and stores the number of "AB. IF" errors on the
forward loop side for the optical loop, or the number of "AB. IF"
errors of the coaxial bus for the coaxial bus.
Other than 0: Number of errors
Turning ON Clear communication error count (SB0006) clears
the stored value.
2: Valid only when SB0047 is off. When it turns on (error), the last data are retained.
3: To reset the SW00B8 to SW00C7, turn on the SB0006.
The number of times information stored in the SW00B8 to SW00C7 will not cause any problems if they are counted up gradually over a long period of time.
If they are counted up rapidly in a short period of time (while monitoring with GX Developer, etc.), the cable may be faulty.