Mitsubishi Electric MELSEC-Q Series - Page 266

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(c) When the redundant system is a normal station
*1 For details, refer to the following.
QnPRHCPU User's Manual (Redundant System)
Th = Tsw + SS × 2 [ms]
Th: Cyclic data retention time
Tsw: System switching time of Redundant CPU
*1
SS: Sequence scan time of Redundant CPU
*1
Control system
Control system
Standby system
Standby system
System switching time
Cyclic transmission delay time Cyclic transmission delay 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
Normal station Communication error station
Power
down
Cyclic data retention time