Interrupt Response Time - Siemens SIMATIC S7-400H System Manual
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19.8
Interrupt response time
Definition of interrupt response time
The interrupt response time is the time from the first occurrence of an interrupt signal to the
call of the first instruction in the interrupt OB.
General rule: Higher priority interrupts are handled first. This means the interrupt response
time is increased by the program execution time of the higher-priority interrupt OBs, and by
previous interrupt OBs of the same priority which have not yet been processed (queue).
Note that any update of the standby CPU extends the interrupt response time.
Calculating the interrupt response time
Minimum interrupt response time of the CPU
+ minimum interrupt response time of the
signal modules
+ PROFIBUS DP cycle time on PROFINET
= Shortest interrupt response time
Minimum interrupt response time of the CPU
+ maximum interrupt response time of the
signal modules
+ 2 * cycle time on PROFIBUS DP or PROFINET
= Longest interrupt response time
Process and diagnostic interrupt response times of the CPUs
Table 19- 14 Process and interrupt response times; maximum interrupt response time without
CPU
412-5H stand-alone mode
412–5H redundant
414–5H stand-alone mode
414–5H redundant
416–5H stand-alone mode
416–5H redundant
417–5H stand-alone mode
417–5H redundant
S7-400H
System Manual, 03/2012, A5E00267695-11
communication
Hardware interrupt response
times
min.
190 µs
370 µs
140 µs
330 µs
90 µs
240 µs
80 µs
160 µs
S7-400 cycle and response times
19.8 Interrupt response time
Diagnostic interrupt response
times
max.
min.
370 µs
200 µs
850 µs
410 µs
200 µs
150 µs
620 µs
290 µs
140 µs
90 µs
500 µs
200 µs
90 µs
80 µs
310 µs
140 µs
max.
390 µs
690 µs
330 µs
490 µs
200 µs
400 µs
90 µs
250 µs
379
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