Siemens Simatic S7-1500 Function Manual page 42

Accuracy of a cyclic interrupt
Even if a cyclic interrupt is not delayed by a higher-priority OB or communication activities,
the accuracy with which it is started is nevertheless subject to system-dependent
fluctuations.
The following table shows the accuracy with which a cyclic interrupt is triggered:
Table 3- 5 Accuracy of cyclic interrupts
1511(F)-1 PN
1511T(F)-1 PN
1511C-1 PN
1512C-1 PN
1513(F)-1 PN
Cyclic interrupt ±90 μs
1513R-1 PN
Cyclic interrupt ±390 μs
* Additional information about cycle and response times of R/H CPUs is available in the section "Cycle and response times
of the S7-1500R/H redundant system"
1510SP(F)-1 PN
Cyclic interrupt ±90 μs
Cyclic interrupt
Cycle and response times
Function Manual, 10/2018, A5E03461504-AD
3.3 Time-driven program execution in cyclic interrupts
S7-1500
1515(F)-2 PN
1515T(F)-2 PN
1516(F)-3 PN/DP
1516T(F)-3 PN/DP
±80 μs
S7-1500R/H* in RUN-Solo system state
1515R-2 PN
±300 μs
ET 200SP
1512SP(F)-1 PN
±90 μs
1516pro(F)-2 PN
±80 μs
Cyclic program execution
1517(F)-3 PN/DP
1517T(F)-3 PN/DP
±30 μs
1517H-3 PN
±90 μs
1515SP(F)-PC
±80 μs
ET 200pro
1518(F)-4 PN/DP
1518(F)-4 PN/DP MFP
±25 μs
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