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Entry type: Application example Entry ID: 82255083, Entry date: 05/03/2018
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Determining the transmission time for typical RFID configurations between S7 stations and transponder

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SIMATIC offers a versatile range of RFID systems for effective identification in production technology. In order to make the right choice in the concept phase of an RFID system, it is important to be able to assess the communication performance of a planned SIMATIC configuration.

Important questions in selecting the right components in this context are:

  • Which SIMATIC S7 components are best suited for the planned automation project?
  • What transmission times can be expected from the transponder to the SIMATIC controller in typical configurations and systems?
  • What statistical fluctuations can occur?
  • What effect does the communication have on the cycle (OB1) of an S7 controller?

The following figure shows the measurement setup in principle:




Solution
To answer the above questions, measurements were carried out on typical, practice-relevant configurations with SIMATIC RFID components.

The focus of these measurements is on measuring the runtime of a data package by the entire system. This means from the S7 station to the RFID transponder!

The results of the measurements are provided to you by a simple operation as web application. For a correct interpretation of the measured values, we recommend that you read the boundary conditions of the measurement in the integrated online help.

Overview of measured variables:

Measured variable[ms] Description 
 Transmission time - RFID ReadTime between triggering a read job and the positive acknowledgement at the communication block in the S7 CPU
 Transmission time - RFID WriteTime between triggering a write job and the positive acknowledgement at the communication block in the S7 CPU
 Inventory timeTime between the triggering and the positive acknowledgement at the communication block in order to acquire n transponder in the reading field of the UHF reader. (Only relevant for RF680R UHF reader) 
 Cycle time S7 CPU Time between two cycles in S7 controller
 PN IO update time Update time of the PN IO string (is accepted from the configuration in the TIA portal)
  


Output of the user interface
The interactive user interface makes it possible for you to quickly and easily enter the configuration you require. The selected measured values are immediately displayed in the performance data table.



Access to the performance data
By clicking on the respective version, you get to the web interface of the performance data

 VersionMeasuring time measured components  Documentation on measurements Link for measurement
 V 2 Oct 17 - March 18   (12.6 KB)   RFID_V2 
 V 1 March - Aug. 13   (56.4 KB)   RFID_V1 


 

Additional Information
Summary page for all available communication performance measurements


Last Changes
Repeated measurements with current RFID components and S7 CPUs


Security information
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https://www.siemens.com/cybersecurity#Ouraspiration.
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