Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 452

APPENDICES
No. Name
3 Cyclic transmission status
SB0075 of the remote master
(117) station
3 Remote sub-master
SB0076 station cyclic transmission
(118) status
3 Remote master station
SB0077 cyclic transmission control
(119) status
3 Parameter
SB0078 communication status of
(120) each station
3
SB007A
(122)
Low-speed cyclic
communication status
3
SB007B
(123)
3
Parameter status of each
SB007C
station
(124)
3: Valid only when the SB0047 is off. When it turns on (error), the last data are retained.
App - 13
Table 3 Link special relay (SB) list (continued)
Description
Indicates the master station cyclic transmission status. (Includes
online loop test.)
Off: Master station cyclic transmission normal.
On: Master station cyclic transmission error.
Indicates the cyclic transmission status of the remote sub-master
station. (Including the status at an online loop test)
Off: Cyclic transmission normal
On: Cyclic transmission abnormal
Indicates the station type that is controlling cyclic transmission at
the remote I/O stations.
Off: Remote master station
On: Remote sub-master station
Indicates the parameter transmission status of each station. (Not
applicable to reserved stations and the station with the maximum
station number or higher)
Off: Executing communication other than parameter
communication
On: Executing parameter communication
Stations that are communicating parameters can be checked in
Parameter communication status of each station (SW0078 to
SW007B).
Depending on the timing of the link refresh, Parameter
communication status of each station (SW0078 to SW007B) and
the update may be offset by one sequence scan.
Indicates the low-speed cycle communication status.
It is indicated to have transmitted by turning the bit on for either
the SB007A or SB007B.
ON
OFF OFF
SB007A
ON
OFF
SB007B
Cycle interval
Indicates the parameter status of each station. (Not applicable to
reserved stations and the station with the maximum station
number and higher)
Off: No station detected parameter errors
On: A station detected parameter errors
Stations that have parameter errors can be checked in
Parameter error status of each station (SW007C to SW007F).
Depending on the timing of the link refresh, Parameter error
status of each station (SW007C to SW007F) and the update may
be offset by one sequence scan.
Control
station
Loop Bus
ON
OFF
ON
OFF
[Availability column] Loop: optical loop, Bus: coaxial/twisted bus
MELSEC-Q
Use permitted/prohibited
Remote
Normal Remote I/O
master
station station
station
Loop Bus Loop Bus Loop
: Available, : Not available
App - 13
Bus