Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 471

APPENDICES
No. Name
2
SW00B0
(176)/
SW00B1
Multiplex transmission
(177)/
status (1)
SW00B2
(178)/
SW00B3
(179)
2
SW00B4
(180)/
SW00B5
Multiplex transmission
(181)/
status (2)
SW00B6
(182)/
SW00B7
(183)
3
UNDER on the forward
SW00B8
loop side
(184)
3
CRC on the forward loop
SW00B9
side
(185)
3
OVER on the forward
SW00BA
loop side
(186)
3
Short frame on the
SW00BB
forward loop side
(187)
3
Abort on the forward loop
SW00BC
side (AB, IF)
(188)
2: Valid only when the 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.
App - 32
Table 4 Link special register (SW) list (continued)
Description
Stores each station's forward loop usage status during multiplex
transmission.
0: Uses other than the forward loop
1: Uses the forward loop
b15 b14 b13 b12
SW00B0 16 15 14 13
SW00B1 32 31 30 29
SW00B2 48 47 46 45
SW00B3 64 63 62 61
Stores each station's reverse loop usage status during multiplex
transmission.
0: Uses other than the reverse loop
1: Uses the reverse loop
b15 b14 b13 b12
SW00B4 16 15 14 13
SW00B5 32 31 30 29
SW00B6 48 47 46 45
SW00B7 64 63 62 61
Optical loop: Stores the number of "UNDER" errors on the
forward loop side.
Coaxial/twisted bus: Stores the number of "UNDER" errors.
Other than 0: Number of errors
Turning ON Clear communication error count (SB0006) clears
the stored value.
Optical loop: Stores the number of "CRC" errors on the forward
loop side.
Coaxial/twisted bus: Stores the number of "CRC" errors.
Other than 0: Number of errors
Turning ON Clear communication error count (SB0006) clears
the stored value.
Optical loop: Stores the number of "OVER" errors on the forward
loop side.
Coaxial/twisted bus: Stores the number of "OVER" errors.
Other than 0: Number of errors
Turning ON Clear communication error count (SB0006) clears
the stored value.
Optical loop: Stores the number of "short frame" errors on the
forward loop side.
Coaxial/twisted bus: Stores the number of "short frame" errors.
Other than 0: Number of errors
Turning ON Clear communication error count (SB0006) clears
the stored value.
Optical loop: Stores the number of "AB.IF" errors on the forward
loop side.
Coaxial/twisted bus: Stores the number of "AB.IF" errors.
Other than 0: Number of errors
Turning ON Clear communication error count (SB0006) clears
the stored value.
to b4 b3 b2 b1 b0
5 4 3 2 1
to
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.
to b4 b3 b2 b1 b0
5 4 3 2 1
to
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 - 32