Siemens SIMATIC CPU 410

Supplementary information
18.16 CPU 410 cycle and reaction times
CPU 410 Process Automation/CPU 410 SMART
376 System Manual, 05/2017, A5E31622160-AC
18.16.9
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 18- 20 Reproducibility of time-delay and cyclic interrupts of the CPUs
Module
Reproducibility
Time-delay interrupt
Cyclic interrupt
CPU 410-5H stand-alone mode
± 120 µs
± 160 µs
CPU 410-5H 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.