Siemens Simatic S7-1500 Parts list manual

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SIMATIC
S7-1500, S7-1500R/H, ET 200SP,
ET 200pro
Cycle and response times
Function Manual
10/2018
A5E03461504
-AD
Preface
Documentation guide
1
Program execution
2
Cyclic program execution
3
Event-driven program
execution
4
Cycle and response times of
the S7-1500R/H redundant
system
5

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A5E03461504-AD
Ⓟ
09/2018 Subject to change
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editions.

Cycle and response times
Function Manual, 10/2018, A5E03461504-AD 3
Preface
Purpose of the documentation
The controller offers various options for program execution with different run priorities.
Cyclic-driven and time-driven program execution have the largest share. The response times
of a controller are therefore significantly determined by the processing cycles.
There is also the possibility of event-driven program execution. The event-driven program
execution is normally limited to a few selected events.
This manual provides information on the following topics:
●Types of program execution
●Run priorities
●Cycle and response times, and the influences to which they are subject
●Configuration options for the optimization of your user program
Basic knowledge required
The following knowledge is required in order to understand the documentation:
●General knowledge of automation technology
●Knowledge of the SIMATIC industrial automation system
●Knowledge of the use of Windows-based computers
●Knowledge of working with STEP 7
Conventions
STEP 7: In this documentation, "STEP 7" is used as a synonym for all versions of the
configuration and programming software "STEP 7 (TIA Portal)".
Please also observe notes marked as follows:
Note
A note contains important information on the product described in the documentation, on the
handling of the product or on the section of the documentation to which particular attention
should be paid.

Preface
Cycle and response times
4Function Manual, 10/2018, A5E03461504-AD
Scope of the documentation
This documentation mainly covers the description of the CPU components of the cycle and
response times of the following systems:
●S7-1500 automation system
●S7-1500R/H redundant system
●ET 200SP distributed I/O system
●CPU 1516pro-2 PN of the ET 200pro distributed I/O system
You can find links to more information on the ET 200MP, ET 200SP and ET 200pro
distributed I/O systems at the corresponding points in this manual.
What's new in edition 10/2018 as compared to edition 09/2016?
What's new?
What are the customer benefits?
Where can I find information?
Changed
contents
Scope of the function man-
ual expanded to include
CPUs of the S7-1500R/H
redundant system
The determination of the cycle and re-
sponse times of the S7-1500R/H redun-
dant system follows the same principle as
for the CPUs of the S7-1500 automation
system.
Section Cycle and response
times of the S7-1500R/H re-
dundant system (Page 51)
What's new in the 09/2016 edition compared to the 02/2014 edition?
What's new?
What are the customer benefits?
Where can I find information?
Changed
contents
Scope of the function man-
ual expanded to include the
CPUs of the ET 200SP
distributed I/O system and
CPU 1516pro-2 PN of the
ET 200pro distributed I/O
system
Functions that you will be familiar with
from the SIMATIC S7-1500 CPUs are
implemented in CPUs in other designs
(ET 200SP) and in the CPU 1516pro-2 PN
(degree of protection IP 65, IP 66 and
IP 67)
.
Starting from section Program
execution (Page 13)
Recycling and disposal
For environmentally friendly recycling and disposal of your old equipment, contact a certified
electronic waste disposal company and dispose of the equipment according to the applicable
regulations in your country.

Preface
Cycle and response times
Function Manual, 10/2018, A5E03461504-AD 5
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Preface
Cycle and response times
6Function Manual, 10/2018, A5E03461504-AD
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Cycle and response times
Function Manual, 10/2018, A5E03461504-AD 7
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

Cycle and response times
8Function Manual, 10/2018, A5E03461504-AD
Documentation guide
1
The documentation for the SIMATIC S7-1500 automation system, for CPU 1516pro-2 PN
based on SIMATIC S7-1500, and for the distributed I/O systems SIMATIC ET 200MP,
ET 200SP and ET 200AL is divided into three areas.
This division allows you easier access to the specific information you require.
Basic information
System manuals and Getting Started manuals describe in detail the configuration,
installation, wiring and commissioning of the SIMATIC S7-1500, ET 200MP, ET 200SP and
ET 200AL systems; use the corresponding operating instructions for CPU 1516pro-2 PN.
The STEP 7 online help supports you in configuration and programming.
Device information
Product manuals contain a compact description of the module-specific information, such as
properties, terminal diagrams, characteristics and technical specifications.

Documentation guide
Cycle and response times
Function Manual, 10/2018, A5E03461504-AD 9
General information
The function manuals contain detailed descriptions on general topics such as diagnostics,
communication, Motion Control, Web server, OPC UA.
You can download the documentation free of charge from the Internet
(https://support.industry.siemens.com/cs/ww/en/view/109742705).
Changes and additions to the manuals are documented in product information sheets.
You will find the product information on the Internet:
●S7-1500/ET 200MP (https://support.industry.siemens.com/cs/us/en/view/68052815)
●ET 200SP (https://support.industry.siemens.com/cs/us/en/view/73021864)
●ET 200AL (https://support.industry.siemens.com/cs/us/en/view/99494757)
Manual Collections
The Manual Collections contain the complete documentation of the systems put together in
one file.
You will find the Manual Collections on the Internet:
●S7-1500/ET 200MP (https://support.industry.siemens.com/cs/ww/en/view/86140384)
●ET 200SP (https://support.industry.siemens.com/cs/ww/en/view/84133942)
●ET 200AL (https://support.industry.siemens.com/cs/ww/en/view/95242965)
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