Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 379

7 APPLICATION FUNCTIONS
Station No. 1
System A CPU
scan time
Data sent from station
No. 1 to other station
System A
System B
Station No. 2
System B
CPU scan time
Data sent from station
No. 2 to other station
Other station's data
received from station
No. 1 or 2
7 - 155
2) Redundant CPU system switching time (Tsw) > Control station shift time
(Csw)
[Cyclic data retention time (T
T = Tsw + SS [ms]
H
Tsw : Redundant CPU system switching time [ms]
SS : Redundant CPU scan time [ms]
Control station
Communication error station
Power supply
down
1
0) 1)
Control system Standby system
Standby system
Normal station
Cyclic transmission delay time
0)
)]
H
Control system
System switching time
Sub control station
Control station shift time
1)
Cyclic data retention time
2 3 4
1) 2) 3)
Cyclic transmission delay time
2)
MELSEC-Q
5
4)
3) 4)
7 - 155