Siemens Simatic S7-1500R - S7-1500 R;H Documentation Guide; Basic Information; Device Information; General Information

Cycle and response times
Function Manual, 10/2018, A5E03461504-AD
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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