1 FUNCTIONS
1.7 Redundant System Function
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1
■Cyclic transmission send/receive processing
The slave station maintains cyclic transmission by the transfer of send data to the new control system when system switching
occurs.
The send range of cyclic transmission of both systems is as follows:
• The own station send ranges of the link devices (RY, RWw) of both systems become the same when pairing is set.
• The slave station operating as the control system sends and receives cyclic data.
• The slave station operating as the standby system only receives cyclic data.
Each number in the figure, from No.0 to No.2, represents a station number.
If system switching occurs due to an error in the local station (station No.1), the cyclic data is sent from the local station
(station No.2), which starts operating as the new control system.
Send range of station No.
Send data from the master station
Send data from the local station
Tracking
No.2
RX, RWr
RY, RWw
No.1
No.1
RX, RWr
RY, RWw
No.1, 2
No.0
No.1, 2
No.0
No.1
RX, RWr
RY, RWw
No.1
No.0
No.1, 2
No.0
No.1, 2
No.0
No.1, 2
No.0
No.1, 2
No.0
Local stationMaster station Local station
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