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MELSEC-Q
7 APPLICATION FUNCTIONS
7.10 Multiplexed remote master function (Process CPU)
The multiplex remote master function allows the multiplexed remote sub-master station
to take control of the remote I/O stations when the multiplexed remote master station
fails.
Multiplexed remote
master station
Multiplexed remote
sub-master station
Remote I/O station Remote I/O station Remote I/O station
The multiplexed remote master function has the following merits.
Item Description
(1) Continuation of controlling remote
I/O stations when multiplexed
remote master station becomes
faulty
The multiplexed remote sub-master station (DSM
R) takes control of the remote
I/O stations (R), when the multiplexed remote master station (DMR) becomes
fails.
(2) Selection of operating station
status when multiplexed remote
master station returns to system
It is possible to set parameter to select the operating station status when the
multiplexed remote master station returns to the system.
Return to system as control station
The master operating station (control station) is switched from the multiplexed
remote sub-master station (DSM
R) to the multiplexed remote master station
(DMR).
At the time of switching, the remote I/O stations are reset once.
Return to system as standby station
The multiplexed remote sub-master station (DSMR) operates continuously as
the master operating station (control station).
Furthermore, when the multiplexed remote master station has returned to the
system as the sub-master operating station (standby station), it is switched to
the master operating station (control station) manually.
(3) Startup of a multiplexed remote
sub-master station only
By setting the same parameters as the multiplexed remote master station
(DMR), the multiplexed remote sub-master station (DSMR) can resume control
of remote I/O stations if it is powered on and off while controlling the remote I/O
stations (in case that the multiplexed remote master station has been faulty).