Mitsubishi Electric MELSEC iQ-R Series User Manual page 733

I/O holding time in a redundant system with redundant extension base unit
This section describes the time required for the new control system to input/output values from/to modules on the extension
base unit when systems are switched in a redundant system with redundant extension base unit.
Th = Sc + Tdt + Tsw +Tjo + Y [ms]
• Th: I/O holding time
• Tdt: Extended time required for detecting a system switching cause ( Page 728 Extended time required for detecting a
system switching cause)
• Tsw: Time required for system switching ( Page 729 Time required for system switching)
• Tjo: Extended time from completion of a system switching to the first output ( Page 730 Extended time until initial
output after system switching (Tjo))
• Sc: Scan time of the CPU module in the control system
• Y: Response time of the mounted module ( Manual for each module)
Waiting time for cyclic data receive after system switching (Twcyc)
The following shows the calculation formula for waiting time for cyclic data receive after system switching.
When 'Setting to wait cyclic data receive after system switching' of the CPU parameter is enabled in the redundant line
structure of the CC-Link IE Field Network module, the waiting time for cyclic data after system switching (Twcyc) is added to
the delay time until initial output after system switching (Tjo). When the setting is disabled (default), 0 [ms] is added.
Twcyc = Lsw + 2LS [ms]
• Lsw: Line switching time of the CC-Link IE Field Network module
• LS: Link scan time of the CC-Link IE Field Network module
For the calculation formula for Lsw and LS, refer to the following.
 MELSEC iQ-R CC-Link IE Field Network User's Manual (Application)
Memory copy time
The following table shows the time taken for the memory copy under the following conditions:
[Condition]
• CPU module: R120PCPU
• Sequence scan time: 5ms
• The SD memory card of the standby system CPU module has been formatted.
• Data in the program memory, data memory, and SD memory card are mismatched between the control system and standby
system.
Memory copy target memory and size of data to be transferred
Size of data transferred from the data memory and program memory: 144K bytes
Size of data transferred from the SD memory card: 128K bytes
Size of data transferred from the data memory and program memory: 282K bytes
Size of data transferred from the SD memory card: 512K bytes
Memory copy time depends on the data to be copied and the use of the SD memory card. Use the time above as a rough
standard for memory copy.
Memory copy time
30s
40s
Appendix 7 Processing Time
A
APPX
731