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.
