Cycle and Response Times of the S7-400
9.10 Reproducibility of Time-Delay and Watchdog Interrupts
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
9-25
9.10 Reproducibility of Time-Delay and Watchdog Interrupts
Definition of "Reproducibility"
Time-delay interrupt:
The deviation with time from the first instruction of the interrupt OB being called to the
programmed interrupt time.
Watchdog interrupt:
The variation in the time interval between two successive calls, measures between the first
instruction of the interrupt OB in each case.
Reproducibility
The following table contains the reproducibility of time-delay and cyclic interrupts of the
CPUs.
Table 9-10 Reproducibility of Time-Delay and Watchdog Interrupts of the CPUs.
Reproducibility
Module
Time delay interrupt: Cyclic interrupt
CPU 414 -182 µs / +185 µs -25 µs / +26 µs
CPU 416 -210 µs / +206 µs -16 µs / +18 µs
These times only apply if the interrupt can actually be executed at this time and if not
interrupted, for example, by higher-priority interrupts or queued interrupts of equal priority.
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