Siemens SIMATIC S7-1500, SIMATIC S7-1500R/H, SIMATIC ET 200SP, SIMATIC ET 200pro Function Manual
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SIMATIC
S7-1500
Isochronous mode
Function Manual
10/2018
A5E43884988
Preface
Documentation guide
1
What is isochronous mode?
2
Use of isochronous mode
3
Time sequence of
synchronization
4
Configuring isochronous
mode
5
Programming isochronous
mode
6
-AA
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A5E43884988-AA
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09/2018 Subject to change
Preface
Purpose of the documentation
Basic knowledge required
Scope
This function manual provides an overview of the isochronous mode function for I/O modules
that you operate isochronously:
● As central I/O in a SIMATIC S7-1500
● In distributed I/O systems on PROFINET IO
● In distributed I/O systems on PROFIBUS DP
● Jointly as central and distributed I/O on PROFINET IO
The documentation supports you in the configuring and programming of isochronous mode.
The following knowledge is required in order to understand the manual:
● General knowledge of automation technology
● Knowledge of the industrial automation system SIMATIC
● Knowledge about the use of Windows-based computers
● Knowledge about how to use STEP 7 (TIA Portal)
This documentation is the basic documentation for the SIMATIC S7-1500 automation system
and all SIMATIC products from the PROFINET and PROFIBUS environments. The product
documentation is based on this documentation.
The manual applies to the SIMATIC S7-1500 automation system with CPUs Firmware
Version V2.6 or higher (except S7-1500 Compact CPUs and S7-1500R/H CPUs). SIMATIC
STEP 7 Professional V15.1 or higher is also required.
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3
Preface
Conventions
STEP 7:
Note
A note contains important information on the product, on handling of the product and
section of the documentation to which you should pay particular attention.
Security information
programming software "STEP 7 as of V15.1 (TIA Portal)" and subsequent versions.
This documentation contains pictures of the devices described. The figures may differ
slightly from the device supplied.
You should also pay particular attention to notes such as the one shown below:
Siemens provides products and solutions with industrial security functions that support the
secure operation of plants, systems, machines and networks.
In order to protect plants, systems, machines and networks against cyber threats, it is
necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial
security concept. Siemens' products and solutions constitute one element of such a concept.
Customers are responsible for preventing unauthorized access to their plants, systems,
machines and networks. Such systems, machines and components should only be
connected to an enterprise network or the internet if and to the extent such a connection is
necessary and only when appropriate security measures (e.g. firewalls and/or network
segmentation) are in place.
We refer to "STEP 7" in this documentation as a synonym for the configuration and
on the
For additional information on industrial security measures that may be implemented, please
visit (https://www.siemens.com/industrialsecurity).
Siemens' products and solutions undergo continuous development to make them more
secure. Siemens strongly recommends that product updates are applied as soon as they are
available and that the latest product versions are used. Use of product versions that are no
longer supported, and failure to apply the latest updates may increase customers' exposure
to cyber threats.
To stay informed about product updates, subscribe to the Siemens Industrial Security RSS
Feed under (https://www.siemens.com/industrialsecurity).
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Preface
Siemens Industry Online Support
Product support
Application examples
Services
Forums
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Industry Mall
You can find current information on the following topics quickly and easily here:
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All the information and extensive know-how on your product, technical specifications,
FAQs, certificates, downloads, and manuals.
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Tools and examples to solve your automation tasks – as well as function blocks,
performance information and videos.
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Information about Industry Services, Field Services, Technical Support, spare parts and
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For answers and solutions concerning automation technology.
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Your personal working area in Industry Online Support for messages, support queries,
and configurable documents.
This information is provided by the Siemens Industry Online Support in the Internet
(https://support.industry.siemens.com).
The Industry Mall is the catalog and order system of Siemens AG for automation and drive
solutions on the basis of Totally Integrated Automation (TIA) and Totally Integrated Power
(TIP).
You can find catalogs for all automation and drive products on the Internet
(https://mall.industry.siemens.com).
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5
Table of contents
Preface ................................................................................................................................................... 3
1 Documentation guide .............................................................................................................................. 7
2 What is isochronous mode? .................................................................................................................. 12
3 Use of isochronous mode...................................................................................................................... 15
4 Time sequence of synchronization ........................................................................................................ 17
5 Configuring isochronous mode .............................................................................................................. 22
6 Programming isochronous mode ........................................................................................................... 43
Glossary ............................................................................................................................................... 49
Index .................................................................................................................................................... 54
4.1 Time sequence of synchronization on PROFINET IO and PROFIBUS DP........................... 17
4.2 Time sequence of synchronization in the central configuration ............................................. 19
5.1 Configuring isochronous mode for distributed I/O on PROFINET IO .................................... 24
5.2 Configuring isochronous mode for central I/O in S7-1500 ..................................................... 26
5.3 Configuring joint isochronous operation of central and distributed I/O .................................. 30
5.4 Configuring isochronous mode for distributed I/O on PROFIBUS DP ................................... 32
5.5 Configuring isochronous mode for a Motion Control application ........................................... 34
5.6 Setting the application cycle and delay time .......................................................................... 41
6.1 Program execution according to the IPO model .................................................................... 44
6.2 Program execution according to the OIP model .................................................................... 46
6.3 Programming of isochronous mode for Motion Control applications ..................................... 48
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Basic information
Device information
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.
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.
Product manuals contain a compact description of the module-specific information, such as
properties, terminal diagrams, characteristics and technical specifications.
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Documentation guide
General information
Manual Collections
"mySupport"
"mySupport" - Documentation
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)
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)
With "mySupport", your personal workspace, you make the best out of your Industry Online
Support.
In "mySupport", you can save filters, favorites and tags, request CAx data and compile your
personal library in the Documentation area. In addition, your data is already filled out in
support requests and you can get an overview of your current requests at any time.
You must register once to use the full functionality of "mySupport".
You can find "mySupport" on the Internet (https://support.industry.siemens.com/My/ww/en).
In the Documentation area in "mySupport" you can combine entire manuals or only parts of
these to your own manual.
You can export the manual as PDF file or in a format that can be edited later.
You can find "mySupport" - Documentation on the Internet
(https://support.industry.siemens.com/My/ww/en/documentation).
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Documentation guide
"mySupport" - CAx data
Application examples
TIA Selection Tool
In the CAx data area in "mySupport", you can access the current product data for your CAx
or CAe system.
You configure your own download package with a few clicks.
In doing so you can select:
● Product images, 2D dimension drawings, 3D models, internal circuit diagrams, EPLAN
macro files
● Manuals, characteristics, operating manuals, certificates
● Product master data
You can find "mySupport" - CAx data on the Internet
(https://support.industry.siemens.com/my/ww/en/CAxOnline).
The application examples support you with various tools and examples for solving your
automation tasks. Solutions are shown in interplay with multiple components in the system separated from the focus on individual products.
You will find the application examples on the Internet
(https://support.industry.siemens.com/sc/ww/en/sc/2054).
With the TIA Selection Tool, you can select, configure and order devices for Totally
Integrated Automation (TIA).
This tool is the successor of the SIMATIC Selection Tool and combines the known
configurators for automation technology into one tool.
With the TIA Selection Tool, you can generate a complete order list from your product
selection or product configuration.
You can find the TIA Selection Tool on the Internet
(https://w3.siemens.com/mcms/topics/en/simatic/tia-selection-tool).
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Documentation guide
SIMATIC Automation Tool
PRONETA
You can use the SIMATIC Automation Tool to run commissioning and maintenance activities
simultaneously on different SIMATIC S7 stations as a bulk operation, independently of the
TIA Portal.
The SIMATIC automation tool provides a variety of functions:
● Scanning of a PROFINET/Ethernet plant network and identification of all connected CPUs
● Address assignment (IP, subnet, gateway) and station name (PROFINET device) to a
CPU
● Transfer of the date and programming device/PC time converted to UTC time to the
module
● Program download to CPU
● Operating mode switchover RUN/STOP
● CPU localization by means of LED flashing
● Reading out CPU error information
● Reading of CPU diagnostic buffer
● Reset to factory settings
● Updating the firmware of the CPU and connected modules
You can find the SIMATIC Automation Tool on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/98161300).
With SIEMENS PRONETA (PROFINET network analysis), you analyze the plant network
during commissioning. PRONETA features two core functions:
● The topology overview independently scans PROFINET and all connected components.
● The IO check is a fast test of the wiring and the module configuration of a plant.
You can find SIEMENS PRONETA on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/67460624).
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Documentation guide
SINETPLAN
SINETPLAN, the Siemens Network Planner, supports you in planning automation systems
and networks based on PROFINET. The tool facilitates professional and predictive
dimensioning of your PROFINET installation as early as in the planning stage. In addition,
SINETPLAN supports you during network optimization and helps you to exploit network
resources optimally and to plan reserves. This helps to prevent problems in commissioning
or failures during productive operation even in advance of a planned operation. This
increases the availability of the production plant and helps improve operational safety.
The advantages at a glance
● Network optimization thanks to port-specific calculation of the network load
● Increased production availability thanks to online scan and verification of existing systems
● Transparency before commissioning through importing and simulation of existing STEP 7
projects
● Efficiency through securing existing investments in the long term and optimal exploitation
of resources
You can find SINETPLAN on the Internet (https://www.siemens.com/sinetplan).
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2
Objectives of isochronous operation
The advantages of the isochronous mode function in automation engineering can be seen in
an example from everyday life.
The transmission of data corresponds to the transport of people on public transport.
Assuming public transport were to operate at maximum speed while reducing stop times at
the passenger terminals to absolute minimum, the last thing many potential passengers
would notice of the departing contraption are its red tail lights. The overall travel time is,
however, decided by the train, bus or underground-railway clock, because well adjusted
timing is essential to a good service. This also applies in automation engineering. Not only
fast cycles but also the coordination and synchronization of the individual cycles result in
optimum throughput.
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What is isochronous mode?
Just-In-Time
Figure 2-1 System cycle
The fast and reliable reaction time of a system operating in isochronous mode is based on
the fact that all data are provided just-in-time. The basis for this is a constant bus cycle.
The isochronous mode function guarantees synchronization of the following at constant time
intervals:
● Signal acquisition and output by the central and distributed I/O
● Signal transmission via backplane bus, PROFINET IO or PROFIBUS DP
● Program execution in the CPU in local time, in time with the constant bus cycle time
PROFINET IO or PROFIBUS DP
The result is a system that acquires its input signals, processes them and outputs the output
signals at constant time intervals. Isochronous mode guarantees precisely reproducible and
defined process reaction times as well as constant bus cycle and synchronous signal
processing for central and distributed I/O.
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What is isochronous mode?
Advantages of isochronous mode
The use of isochronous mode enables high-precision control loops.
● Optimized control loops through constant, calculable dead times
● Determinism, reliable reproducibility of reaction times
● Consistent (simultaneous) reading in of input data
● Consistent (simultaneous) output of output data
● Oversampling for processing of fast processes thanks to higher sampling rates than the
send clock permits
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An isochronous system acquires measured values and process data within a fixed system
cycle, processes the signals and outputs them synchronously to the process. Isochronous
mode contributes to a high control quality and increased production accuracy. With
isochronous mode, the possible fluctuations of process reaction times are drastically
reduced. You make use of the time-assured processing to improve machine cycle times.
Even fast processes can be reliably controlled thanks to the precise time reproducibility of all
sequences. Shorter cycle times increase the processing speed and help to lower production
costs.
In principle, isochronous mode lends itself to being used whenever measured values must
be acquired synchronously, movements must be coordinated, and process responses must
be defined and carried out simultaneously. There are thus numerous applications for
isochronous mode.
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Use of isochronous mode
Example: Measuring at multiple measurement points with isochronous mode
Automation task
Feature
Solution
Advantage and benefits
A camshaft production process requires precise measurement of the camshafts for quality
assurance purposes.
For this purpose, a component is needed that can synchronously measure the positions and
displacements of the cam during a rotation of the camshaft.
Figure 3-1 Measuring of camshafts
With use of isochronous mode, the measured values are simultaneously acquired at the
various measuring points at fixed times. This yields the following sequence of operations:
● Continuously rotate the camshaft
● During the continuous rotation, synchronously measure the positions and cam
displacements
● Process the next cam shaft
Thus, during a single rotation of the camshaft, all the positions of the camshaft and the
associated measured values (red) are measured synchronously. The machine cycle time
improves with the same or better measuring accuracy.
The time required for measurement is reduced.
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