Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual page 85

■Cyclic transmission send/receive processing
The RJ71GF11-T2 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.
• The master operating station operating as the control system sends and receives cyclic data.
• The submaster operating 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.
No.0
CPU module Master station
Device RX, RWr
No.0
No.1
No.2
Device RY, RWw
No.0
No.1
No.2
Send range of station No.
Link refresh
Send data from the master station
Send data from the local station
Tracking
If system switching occurs due to an error in the master station (station No.0), the cyclic data is sent from the submaster
station (station No.2), which starts operating as the new control system.
No.1
Local station
Submaster station
RX, RWr RX, RWr
No.0 No.0
No.1 No.1
No.2 No.2
RY, RWw RX, RWw
No.0 No.0
No.1 No.1
No.2 No.2
No.2
CPU module
Device
Device
1.7 Redundant System Function
1
1 FUNCTIONS
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