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7.5 Cyclic Data Retention Time for System Switching in Redundant System
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PROCESSING TIME
7.5
Cyclic Data Retention Time for System Switching in Redundant
System
This section gives calculation formulas for cyclic data retention time that is taken when a
system switching occurs in a redundant system.
(1) Cyclic data retention time when the control system power supply
module is faulty or powered off or when the control system CPU is faulty
or reset
(a) When the redundant system is a control station
1) 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 = Csw+ 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
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