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Siemens Industry Online Support
Siemens AG
Entry type: Application example Entry ID: 22180794, Entry date: 06/25/2012
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Determining the transfer time for typical configurations in PROFIBUS

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  • Associated product(s)

Task
Automation projects often require intensive data exchange between SIMATIC S7 controllers. The possible communication paths vary considerably. Numerous S7 controllers and S7 communication modules are available.
To be able to make the right selection in the concept phase of an automation project, it is important to know the communication performance of the planned configuration.

Important questions in this context are listed below:

  • Which S7 components are best suited for the planned automation project?
  • Which data transfer times are expected for typical configurations?
  • How does the data communication affect the cycle (OB1) of an S7 controller?

The following screen shows the schematic layout of the measurement on a variant:

Solution
To answer the above questions, Industry Automation and Customer Services carried out extensive measurements on typical configurations with SIMATIC components, which provide planning certainty for your plants:

  • Typical S7 controllers transfer data up to 8 S7 controllers.
  • Typical parameters and configurations.
  • Praxis relevant load programs within the respective S7 controller.

A simple user interface of a web application provides you with the results of the measurements.

Overview of the measured variables:

Measured variable

Description

Transmission time Time from send trigger command to reception of the data in the respective data block of the receiver.
Cycle time sender Time between two process image transfers in the S7 controller of the sender.
Cycle time receiver Time between two process image transfers in the S7 controller of the receiver.

Note
Measurement was performed for some typical configurations. This does not mean that every possible configuration has been measured.

Outputs on the user interface
An interactive user interface enables you to quickly and easily enter your desired configuration.
The corresponding performance data is available by clicking the mouse.

Access to the performance data
Click the respective version to go to the web interface of the performance data.

Version Measuring time Components used Link
V 1.0 July - Nov. 2005 Measured_Components_of_KommPB_ID5.pdf ( 37 KB )

CommPB_V1

Last modification
Switch to new Web user interface.