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      Entry type: Application example Entry ID: 62830463, Entry date: 10/15/2018
      (10)
      Rate

      Add-on blocks for Modbus/TCP communication

      • Entry
      • Associated product(s)
      Modbus/TCP product blocks allow communication between S7-CPUs and devices from other manufacturers.

      This involves the following products.
       

      NameArticle number
      Modbus/TCP CP2XV9450-1MB00
      6AV6676-6MB00-6AX0
      6AV6676-6MB00-6AD0
      Modbus/TCP CP RED6AV6676-6MB30-3AX0
      6AV6676-6MB30-3AD0
      6AV6676-6MB30-4AX0
      6AV6676-6MB30-4AD0
      Modbus/TCP RED V22XV9450-1MB11
      Modbus/TCP PN CPU2XV9450-1MB02
      6AV6676-6MB20-3AX0
      6AV6676-6MB20-3AD0
      Modbus/TCP PN RED

      6AV6676-6MB10-0AX0
      6AV6676-6MB10-0AD0

      Table 1

      Frequently, adaptations are required when implementing Modbus/TCP communication in a larger plant or system, for example:

      • For communication with Modbus/TCP blocks, more data should be sent to a partner than is possible using a single telegram. 
      • The Modbus data to be sent or read is saved in global data blocks. However, when using CFC, global data blocks are often not wanted.
      • In some plants and systems, it is specified that all the machine data - independent of the data type - is saved in a single data block.

      Solution
      These adaptations can be implemented in a user-friendly and convenient fashion by using the blocks provided in the "Additional Modbus Blocks" library. 

      • The "Job List" block allows several different Modbus telegrams to be cyclically processed.
      • "Data Collectors" blocks can be inserted in a CFC chart by dragging & dropping them. There, they are directly interconnected with the Modbus block to process Modbus data.
      • Using the "Marshalling Blocks" data that has been received or is to be sent with various data types (Holding Register, Input Register, Coils, Inputs) can be marshalled in a single data block.

      "Additional Modbus Blocks" library for STEP 7 V5

       
      Fig. 01

      Documentation and library
        Documentation (1,7 MB)
       Registrierung notwendig  Library for STEP 7 V5 (67,9 KB)

      The "Job List" library for STEP 7 V14 SP1 or higher
      The "Job List" block is available as global library, also for STEP V14 SP1 or higher . Unzip the library to a directory of your choice. Open STEP 7. You can integrate the unzipped library under "Library > Global libraries > Open global library". The block is available in the SCL and STL programming languages.

      Documentation and library
        Documentation (101,6 KB)
       Registrierung notwendig  Library for STEP 7 V14 SP1 (502,8 KB)

      Additional information
      http://www.siemens.de/s7modbus
      Register for our product-specific Newsletter so that you are always informed about product updates.
      https://support.industry.siemens.com

      Last change
      Update of the documentation of the "Additional Modbus Block" library for STEP 7 V5

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