Reproducibility Of Time-Delay And Watchdog Interrupts - Siemens SIMATIC S7-400 Manual

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.
Module
CPU 414
CPU 416
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.
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
9.10 Reproducibility of Time-Delay and Watchdog Interrupts
Reproducibility
Time delay interrupt:
-182 µs / +185 µs
-210 µs / +206 µs
Cycle and Response Times of the S7-400
Cyclic interrupt
-25 µs / +26 µs
-16 µs / +18 µs
9-25