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MELSEC-Q
6 PROGRAMMING
(11) Operation status check and operation switching of the multiplexed
remote master function
The operation of the multiplexed remote master function can be checked or
switched with link special relays (SB) and link special registers (SW).
(a) Checking the operation status of the multiplexed remote
master station
1) If an error occurs in data link, any of the following link special relays
(SB) is turned ON.
• Baton pass status of the remote master station (SB0071)
• Remote sub-master station transient transmission status (SB0072)
• Cyclic transmission status of the remote master station (SB0075)
• Remote sub-master station cyclic transmission status (SB0076)
2) The type of the station that is controlling the cyclic transmission
(remote master or remote sub-master station) can be checked in
Remote master station cyclic transmission control status (SB0077).
No. Description No. Description
SB0071
Baton pass status of the remote master
station
—
SB0072
Remote sub-master station transient
transmission status
SB0075
Cyclic transmission status of the remote
master station
SB0076
Remote sub-master station cyclic
transmission status
SB0077
Remote master station cyclic
transmission control status
(b) Operation switching of the multiplexed remote master station
1) When Remote sub-master station switching command (SB0014) is
turned ON, the remote sub-master station running as a master is
forced to operate as a sub-master station.
2) When the remote sub-master station running as a master accepts the
switching, Remote sub-master station switching acceptance status
(SB01C4) is turned ON.
3) Upon completion of switching from master operation to sub-master
operation, Remote sub-master station switching status (SB01C5) is
turned ON.
4) If the switching fails, an error code is stored in Remote sub-master
station switching result (SW01C4).
No. Description No. Description
SB0014
Remote sub-master station switching
command
SW01C4
Remote sub-master station switching
result
SB01C4
Remote sub-master station switching
acceptance status
SB01C5
Remote sub-master station switching
status