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

S7-400 cycle and reaction times

16.10 Reproducibility of delay and watchdog interrupts

16.10 Reproducibility of delay and watchdog interrupts
Definition of "reproducibility"
Time-delay interrupt:
The period that expires between the call of the first instruction in the interrupt OB and the
programmed time of interrupt.
Cyclic interrupt:
The fluctuation of the time interval between two successive calls, measured between the first
instructions of the interrupt OB.
Reproducibility
The following table contains the reproducibility of time-delay and cyclic interrupts of the
CPUs.
Table 16-14 Reproducibility of time-delay and cyclic interrupts of the CPUs
Module
CPU 412-3H stand-alone mode
CPU 412-3H redundant
CPU 414-4H stand-alone mode
CPU 414-4H redundant
CPU 417-4H stand-alone mode
CPU 417-4H redundant
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.
284
Reproducibility
Time-delay interrupt
-499 µs / +469 µs
-557 µs / +722 µs
-342 µs / +386 µs
-545 µs / +440 µs
-311 µs / +277 µs
-453 µs / +514 µs
Cyclic interrupt
-315 µs / +305 µs
-710 µs / +655 µs
-242 µs / +233 µs
-793 µs / +620 µs
-208 µs / +210 µs
-229 µs / +289 µs
System Manual, 09/2007, A5E00267695-03
S7-400H