7
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7.5 Cyclic Data Retention Time for System Switching in Redundant System
7
PROCESSING TIME
2) System switching time of Redundant CPU (Tsw) Control station switching
time (Csw)
* 1 For details, refer to the following manual.
QnPRHCPU User's Manual (Redundant System)
Th = Tsw + SS [ms]
Th: Cyclic data retention time
Tsw: System switching time of Redundant CPU
*1
Csw: Control station switching time = 20 + Constant link scan set value (
SS: Sequence scan time of Redundant CPU
*1
Figure 7.4 Cyclic data retention time
1
0)
1)
2
3
4
5
1)
2)
3)
4)
0)
1)
2)
3)
4)
System A
CPU scan time
Data sent from
station No.1 to
another station
System A
System B
System B
CPU scan time
Data sent from
station No.2 to
another station
Data received
at another
station from
station No.1 or 2
Station No.1
Station No.2
Control station
Communication error station
Power
down
Control system
Control system
Standby system
Standby system
System switching time
Normal station
Control station switching time
Sub-control station
Cyclic transmission delay time
Cyclic transmission delay time
Cyclic data retention time
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