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8.1.1
Data flow and link device assignment
(1) Master and slave stations (except for local stations)
One-to-one communication is possible between the master and slave stations.
The status information of the link devices (RY and RWw) of the master station is output to the external device of
the slave station, and the input status information from the external device of the slave station is stored in the link
devices (RX and RWr) of the master station.
• Output from the master station
• Input from the slave station
The device of the CPU module turns on.
The device status data of the CPU module are stored in the link devices (RY and RWw) of the master
station by link refresh.
The status data of the link devices (RY and RWw) of the master station are stored in the link devices
(RY and RWw) of each slave station by link scan.
The status data of the link devices (RY and RWw) of the slave station are output to the external
device.
The status data of the external device are stored in the link devices (RX and RWr) of the slave station.
The status data of the link devices (RX and RWr) of the slave station are stored in the link devices
(RX and RWr) of the master station by link scan.
The status data of the link devices (RX and RWr) of the master station are stored in the devices of the
CPU module by link refresh.
1
7
4
5
2
3
6
6
6
3
3
Slave station
Station No.1
RX, RWr
Slave station
Station No.2
RX, RWr
Slave station
Station No.3
RX, RWr
Master
station
Station
No.1
Station
No.2
Station
No.3
External device
External device
CPU
module
Device
RX, RWr
END
END
E
N
D
Link refresh
Link
scan
RY, RWw
RY, RWw
RY, RWw
Station No.1
Station No.2
Station No.3
Device
RY, RWw
Sequence
scan
Sequence
scan
END
END
E
N
D
Link refresh
M0
Y
Station No.0
Area where data is sent to
other stations
Station
No.1
Station
No.2
Station
No.3
Station No.1
Station No.2
Station No.3
1
2
3
4
5
6
7