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MELSEC-Q
7 APPLICATION FUNCTIONS
(d) The intelligent function modules such as QJ71C24, QJ71E71 which are
mounted to the remote I/O stations can access the station that is currently
performing master operation in the MELSEC communication protocol.
Access Destination Target Station Number to Be Set
Multiplexed remote master station
(Station No. 0)
7D
H
Multiplexed remote sub-master station Multiplexed remote sub-master station No.
Master operating station 7E
H
(e) The outputs of the remote I/O stations are held while master operation is
being switched from the multiplexed remote master station to the
multiplexed remote sub-master station.
Multiplexed remote
master station
Multiplexed remote
sub-master station
Master operation
Remote I/O station
Remote I/O station Remote I/O station
Multiplexed remote master station returns to system
Multiplexed remote
master station
Multiplexed remote
sub-master station
Master operation
Sub-master operation
Information
transfer
After switching, outputs are cleared.
Remote I/O station Remote I/O station Remote I/O station
POINT
Start up the multiplexed remote sub-master station last (after the data link of the
multiplexed remote master station and remote I/O stations is established).
To start from a data link using the multiplexed remote master station independently
of the startup order, do not set Total stations and Setup common in the parameters
of the multiplexed remote sub-master station.
REMARK
The multiplexed remote master station and multiplexed remote sub-master station
cannot be mounted together on a single PLC CPU.
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