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MELSEC-Q
APPENDICES
Table 2 Link special relay (SB) 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
3
SB0076
(118)
Remote sub-master
station cyclic transmission
status
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
3
SB0077
(119)
Remote master station
cyclic transmission control
status
Indicates the station type that is controlling cyclic transmission at
the remote I/O stations.
Off: Remote master station
On: Remote sub-master station
3
SB0078
(120)
Parameter
communication status of
each 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.
3
SB007A
(122)
Low-speed cyclic
communication status
Indicates the low-speed cycle communication status.
It is indicated to have transmitted by turning the bit on for either
the SB007A or SB007B.
SB007A
SB007B
Cycle interval
3
SB007B
(123)
3
SB007C
(124)
Parameter status of each
station
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.
3 5
SB0080
(128)
CPU operation status of
each station (1)
Indicates the operation status of each station's CPU on the PLC-
to-PLC network (including the host station).
Off: All stations normal
On: A moderate or serous error identified
If a moderate or serious error is identified, the status of each
station can be checked in CPU operation status of each station
(1) (SW0080 to SW0083).
Depending on the timing of the link refresh, CPU operation status
of each station (1) (SW0080 to SW0083) and the update may be
offset by one sequence scan.
Indicates the operation status of each remote I/O station on the
remote I/O network (including the host station).
Off: All stations normal
On: Error station identified
If any error station is identified, the status of each station can be
checked in CPU operation status of each station (1) (SW0080 to
SW0083).
Depending on the timing of the link refresh, CPU operation status
of each station (1) (SW0080 to SW0083) and the update may be
offset by one sequence scan.
3: Valid only when SB0047 is off. When it turns on (error), the last data are retained.
5: Serious errors are the type of errors that stop the CPU operation.
Fatal errors are also the type of errors that stop the CPU operation. (Refer to Section 8.3.3.)