S7-400 cycle and response times
19.10 Reproducibility of delay and watchdog interrupts
S7-400H
382 System Manual, 03/2012, A5E00267695-11
19.10 Reproducibility of delay and watchdog interrupts
Definition of "reproducibility"
Time-delay interrupt:
The period that expires between the call of the first operation in the interrupt OB and the
programmed time of interrupt.
Cyclic interrupt:
The fluctuation range of the interval between two successive calls, measured between the
respective initial operations of the interrupt OB.
Reproducibility
The following table contains the reproducibility of time-delay and cyclic interrupts of the
CPUs.
Table 19- 15 Reproducibility of time-delay and cyclic interrupts of the CPUs
Reproducibility Module
Time-delay interrupt Cyclic interrupt
CPU 412-5H stand-alone mode ± 230 µs ± 250 µs
CPU 412–5H redundant ± 430 µs ± 520 µs
CPU 414–5H stand-alone mode ± 160 µs ± 240 µs
CPU 414–5H redundant ± 280 µs ± 280 µs
CPU 416–5H stand-alone mode ± 130 µs ± 190 µs
CPU 416–5H redundant ± 230 µs ± 210 µs
CPU 417–5H stand-alone mode ± 120 µs ± 160 µs
CPU 417–5H redundant ± 200 µs ± 180 µs
These times only apply if the interrupt can actually be executed at this time and if it is not
delayed, for example, by higher-priority interrupts or queued interrupts of equal priority.
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