1 FUNCTIONS
1.7 Redundant System Function
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1
■Cyclic transmission send/receive processing
The master and slave stations maintain 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 the master stations of both systems become the same.
• The own station send ranges of the link devices (RY, RWw) of the slave stations of both systems become the same.
• Networks of both systems send/receive cyclic data independently of each other.
Each number in the figure, from No.0 to No.1, represents a station number.
When system switching occurs due to an error in the control system, the control is switched to the network of the new control
system.
Between the networks of both systems, a maximum difference of 1 link scan time occurs in the cyclic
transmission delay time.
Send range of station No.
Link refresh
Send data from the master station
Send data from the slave station
Tracking
RX, RWr RX, RWr
No.1
RX, RWw RX, RWw
No.1
No.1
No.1
RX, RWr RX, RWr
No.1
RX, RWw RX, RWw
No.1
No.1
No.1
Master stationCPU module Slave station
No.1 (control system)No.0 (control system)
Device
Device
Master stationCPU module Slave station
No.1 (standby system)No.0 (standby system)
Device
Device
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