Mitsubishi Electric MELSEC iQ-R-R6SFM - Redundant Function Processing Time

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APPX
Appendix 9 Processing Time
Redundant function processing time
This section describes the redundant function processing time in the Process CPU (redundant mode) or SIL2 Process CPU.
Increase in the scan time due to tracking transfer
The following describes the increase in the scan time of the CPU module due to tracking transfer.
The increase in the scan time determined by the following calculation formula is a rough standard for a system start-up. Check
the increase in the scan time with the actual systems.
The scan time can be checked in SD520 and SD521 (Current scan time). ( Page 850 Fixed scan function
information)
Ex.
When CTRL is a control system execution program and MAIN is a program executed in both systems
*1 If the constant scan is used, waiting time for the constant scan is generated.
Item Increase in the scan time Reference
Increase in the scan time of the CPU
module in the control system (Ts)
Ts = Twr + Tst + Tca +  [ms] Twr: Page 927 Waiting time for completion of the previous tracking data
reflection
Tst: Page 927 Tracking data send time
Tca: Page 929 Waiting time for completion of tracking data reception
: Page 929 Other extended times
Increase in the scan time of the CPU
module in the standby system (Tsb)
Tsb = Taw + Trc [ms] Taw: Page 929 Waiting time for tracking data reception
Trc: Page 930 Tracking data reflection time
MAIN, CTRL Twr Tst Tca
Ts
MAIN
Tca
Trc Taw Trc
Tsb
*1*1
Data reception
completion
Data reception
completion
Update
completion
END processing
END processing
END processing
END
processing
Update
completion
Scan time of the control system CPU module
Control system
CPU module
I/O
refresh
Standby system
CPU module
I/O
refresh
Tracking data
Scan time of the standby system CPU module
I/O
refresh