User Program Execution Time - Siemens Simatic S7-1500 Function Manual

3.2.2.2

User program execution time

Introduction
Organization blocks or system activities with higher priority interrupt organization blocks or
system activities with lower priority, and thus extend their runtime.
Program execution time without interruptions
The user program has a certain runtime without interruptions. The runtime depends on the
number of operations that are executed in the user program.
The following table contains the typical durations of operations.
Table 3- 2 Duration of an operation
1511(F)-1 P
N
1511T(F)-1
PN
1511C-1 PN
Bit operations, 60 ns
typ.
Word operations, 72 ns
typ.
Fixed-point arith- 96 ns
metic, typ.
Floating-point 384 ns
arithmetic, typ.
1513R-1 PN
Bit operations, 40 ns
typ.
Word operations, 48 ns
typ.
Fixed-point arith- 64 ns
metic, typ.
Floating-point 256 ns
arithmetic, typ.
* 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"
Cycle and response times
Function Manual, 10/2018, A5E03461504-AD
1512C-1 P 1513(F)-1 P
N N
48 ns 40 ns
58 ns 48 ns
77 ns 64 ns
307 ns 256 ns
S7-1500R/H* in RUN-Solo system state
1515R-2 PN
30 ns
36 ns
48 ns
192 ns
S7-1500
1515(F)-2 P 1516(F)-3 P
N N/DP
1515T(F)-2 1516T(F)-3
PN PN/DP
30 ns 10 ns
36 ns 12 ns
48 ns 16 ns
192 ns 64 ns
Cyclic program execution
3.2 Cycle time
1517(F)-3 P 1518(F)-4 P
N/DP N/DP
1517T(F)-3 1518(F)-4 P
PN/DP N/DP MFP
2 ns 1 ns
3 ns 2 ns
3 ns 2 ns
12 ns 6 ns
1517H-3 PN
2 ns
3 ns
3 ns
12 ns
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