Supplementary information
18.16 CPU 410 cycle and reaction times
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
361
The calculated cycle time of a S7-400H CPU must be multiplied by a CPU-specific factor.
The table below lists these factors:
Table 18- 12 Extending the cycle time
CPU 410-5H stand-alone mode
Long synchronization cables may increase cycle times. This extension can have the factor 2
- 5 with a cable length of 10 km.
Operating system execution time at the cycle control point
The table below shows the operating system execution time at the cycle checkpoint of the
CPUs.
Table 18- 13 Operating system execution time at the cycle control point
CPU 410-5H stand-alone mode
Cycle control at the SCCP 25 - 330 µs
∅ 30 µs
120 - 600 µs
∅ 135 µs
Extended cycle time due to nested interrupts
Table 18- 14 Extended cycle time due to nested interrupts
CPU 410-5H
stand-alone
75 µs 40 µs 50 µs 40 µs 40 µs 20 µs 20 µs 55 µs
CPU 410-5H
180 µs 70 µs 200 µs 120 µs 120 µs 90 µs 45 µs 130 µs
The program runtime at interrupt level must be added to this time extension.
If several interrupts are nested, their times must be added together.
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