Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 380

7 APPLICATION FUNCTIONS
Station No. 1 Normal station
System A
1
CPU scan time
Data sent from
station No. 1 to
0)
other station
System A
Control system
Standby system
System B
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
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(b) When the redundant system has normal stations
[Cyclic data retention time (T
T = Tsw + SS [ms]
H
Tsw : Redundant CPU system switching time [ms]
SS : Redundant CPU scan time [ms]
Communication error station
Power supply
down
1)
Standby system
Cyclic transmission delay time
0)
)]
H
Control system
System switching time
2
1)
1)
Cyclic data retention time
MELSEC-Q
3 4 5
2) 3) 4)
Cyclic transmission delay time
2) 3) 4)
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