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Cycle and response times

Function Manual, 10/2018, A5E03461504-AD

Table of contents

Preface ................................................................................................................................................... 3

1 Documentation guide .............................................................................................................................. 8

2 Program execution ................................................................................................................................ 13

2.1 Principle of operation .............................................................................................................. 13

2.2 Overload behavior ................................................................................................................... 16

3 Cyclic program execution ...................................................................................................................... 20

3.1 Cycle ....................................................................................................................................... 21

3.2 Cycle time ............................................................................................................................... 24

3.2.1 Different cycle times ................................................................................................................ 24

3.2.2 Influences on the cycle time ................................................................................................... 28

3.2.2.1 Update time for process image partitions ............................................................................... 28

3.2.2.2 User program execution time .................................................................................................. 31

3.2.2.3 Extension of cycle time due to communication load ............................................................... 36

3.2.2.4 Special consideration when PROFINET IO communication is configured on the 2nd

PROFINET interface (X2) ....................................................................................................... 38

3.3 Time-driven program execution in cyclic interrupts ................................................................ 40

3.4 Response time for cyclic and time-driven program execution ................................................ 42

3.5 Summary of response time with cyclic and time-controlled program execution ..................... 45

4 Event-driven program execution ............................................................................................................ 47

4.1 Response time of the CPUs when program execution is event-controlled ............................ 47

4.2 Process response time when program execution is event-driven .......................................... 49

5 Cycle and response times of the S7-1500R/H redundant system ........................................................... 51

5.1 Introduction ............................................................................................................................. 51

5.2 Maximum cycle time and time errors ...................................................................................... 52

5.3 Influences on the cycle time of the S7-1500R/H redundant system ....................................... 54

5.3.1 Influences on the cycle time in RUN-Solo system state ......................................................... 54

5.3.2 Influences on the cycle time in SYNCUP system state .......................................................... 55

5.3.3 Influences on the cycle time in RUN-Redundant system state............................................... 59

5.3.4 Influences on the cycle time when a CPU fails ....................................................................... 63

5.4 Response time of R/H CPUs .................................................................................................. 66

5.5 Timetables for the RUN-Redundant system state .................................................................. 69

Glossary ............................................................................................................................................... 72

Index..................................................................................................................................................... 77