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Entry type: Application example Entry ID: 40556214, Entry date: 09/13/2019
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Data Synchronization with S7 Communication between several S7-1200 Substations and one S7-1500/300 Head PLC

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This application example handles the data exchange via S7 communication between a S7-1500 or S7-300 as head PLC (client) and several S7-1200 substations (servers).

Task
A cyclic communication is often required for synchronization tasks and exchanging control and status information between a head-end station (here client) and several distributed substations (here server) via Industrial Ethernet.
The following points shall be realized:

  • Supplying all field controllers with the same or differend data records from the head-end station.
  • Updating the data records from all substations in the head-end station.

Solution
In an application example, the solution provides a modular STEP 7 (TIA Portal) program for the synchronization between head-end and substations. The employed hardware components are S7-1200 CPUs in the substations, and an S7-1500 or alternatively an S7-300 CPU in the head-end station. The program offers the following functionalities:

  • Supplying the substations (servers) with data records defined by the user (write synchronization).
  • Updating defined data records from the substations (servers) with the client head-end station (client) (read synchronization).
  • Optional clock synchronization from the head-end station (client) to the servers.

The solution introduced here offers you the following advantages:

  • Simple changes of size and storage location of the data areas to be synchronized in the example project..
  • Scalable project for application of less or more than four substations.
  • Modular program setup. Both synchronization directions are encapsulated completely in function blocks and can be used separately in your applications.
  • In the example program, some measurements for the transfer time were generated which help you estimate your synchronization time.

Downloads
Version 2.1 for STEP 7 (TIA Portal) V15.1 or higher
  Documentation "Consistent Data Synchronization with S7 Communication between several Substations and one Head PLC" (1,6 MB)
 Registrierung notwendig  Sample project with one head PLC (S7-1500 or S7-300) and four substations (S7-1200) (1,1 MB)

Further Information
Application example "Data synchronization over open communication between multiple field devices (S7-1200) and a head PLC (S7-1200/ S7-300/ WinAC)"

Last Changes
Error elimination + update to TIA Portal V15.1

Additional Keywords
Central station, field station, data concentratorsynchronization


Security information
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