Cycle and reaction times
5.5 Interrupt response time
CPU 31xC and CPU 31x, Technical Data
5-20 Manual, 01/2006 Edition, A5E00105475-06
5.5 5.5 Interrupt response time
5.5.1 Overview
Definition of interrupt response time
The interrupt response time is the time that expires between the first occurrence of an
interrupt signal and the call of the first interrupt OB instruction. Generally valid: Higher-
priority interrupts take priority. This means that the interrupt response time is increased by
the program processing time of the higher-priority interrupt OBs and the interrupt OBs of
equal priority which have not yet been executed (queued).
Process/diagnostic interrupt response times of the CPUs
Table 5-13 Process and diagnostic interrupt response times
Process interrupt response times Diagnostic interrupt response
times
CPU External
min.
External
Max.
Integrated I/O
Max.
Min. Max.
CPU 312 0.5 ms 0,8 ms - 0.5 ms 1,0 ms
CPU 312C 0.5 ms 0,8 ms 0,6 ms 0.5 ms 1,0 ms
CPU 313C 0,4 ms 0,6 ms 0.5 ms 0,4 ms 1,0 ms
CPU 313C-2 0,4 ms 0,7 ms 0.5 ms 0,4 ms 1,0 ms
CPU 314 0,4 ms 0,7 ms - 0,4 ms 1,0 ms
CPU 314C-2 0,4 ms 0,7 ms 0.5 ms 0,4 ms 1,0 ms
CPU 315-2 DP
CPU 315-2 PN/DP
0,4 ms 0,7 ms - 0,4 ms 1,0 ms
CPU 317-2 DP
CPU 317-2 PN/DP
0,2 ms 0,3 ms - 0,2 ms 0,3 ms
CPU 319-3 PN/DP 0.06 ms 0.10 ms - 0.09 ms 0.12 ms
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