Multiplexed Remote Master Function (Qnphcpu Only) - Mitsubishi QJ71LP21 Reference Manual

7 APPLICATION FUNCTIONS

7.10 Multiplexed remote master function (QnPHCPU only)

Item
(1) Continuation of controlling remote
I/O stations when multiplexed
remote master station becomes
faulty
(2) Selection of operating station
status when multiplexed remote
master station returns to system
(3) Startup of multiplexed remote sub-
master station only
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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. To make this function valid, include the master station (multiplexed remote master
station (DM )) and a sub-master station (multiplexed remote sub-master station
R
(DSM )) on the multiplexed remote I/O network.
R
Multiplexed remote
master station
Remote I/O station Remote I/O station
The multiplexed remote master function has the following merits.
The multiplexed remote sub-master station (DSM
I/O stations (R), when the multiplexed remote master station (DM
fails.
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
(DM ).
R
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 (DSM
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.
By setting the same parameters as the multiplexed remote master station
(DM ), the multiplexed remote sub-master station (DSM
R
of remote I/O stations if it is powered on and then off while controlling the
remote I/O stations (In case that the multiplexed remote master station has
been faulty.)
Multiplexed remote
sub-master station
Remote I/O station
Description
) to the multiplexed remote master station
R
MELSEC-Q
) takes control of the remote
R
) becomes
R
) operates continuously as
R
) can resume control
R
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