APPX
Appendix 9 Processing Time
933
A
■Safety control
• Tso: Extended time from completion of a system switching to the first output
• Msw: Master station switching time
• Lsw: Line switching time
• Tsc: Safety cycle time
• Tsio: Safety cycle processing time
• TM: Transmission interval monitoring time
• RM: Safety refresh monitoring time
Memory copy time
The following table shows the time taken for the memory copy under the following conditions:
■Example of Process CPU (redundant mode)
[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 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.
■Example of SIL2 Process CPU
[Condition]
• CPU module: R120PSFCPU
• Sequence scan time: 5ms
• The SD memory card of the standby system CPU module has been formatted.
• Data in the SD memory card is mismatched between the control system and standby system.
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.
Item Calculation formula
Normal value Tso = (Msw or Lsw) + Tsc + 1.5 TM + 4.5 RM + Tsio[ms]
Maximum value Tso = (Msw or Lsw) + Tsc + 2 TM + 9 RM + Tsio[ms]
Memory copy target memory and size of data to be transferred Memory copy time
Size of data transferred from the data memory and program memory: 144K bytes
Size of data transferred from the SD memory card: 128K bytes
30s
Size of data transferred from the data memory and program memory: 282K bytes
Size of data transferred from the SD memory card: 512K bytes
40s
Memory copy target memory and size of data to be transferred Memory copy time
Size of data transferred from the data memory and program memory: 154K bytes
Size of data transferred from the SD memory card: 128K bytes
50s
Size of data transferred from the data memory and program memory: 292K bytes
Size of data transferred from the SD memory card: 512K bytes
70s
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