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    Entry type: Application example Entry ID: 62830463, Entry date: 10/15/2018
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    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
    In order to protect technical infrastructures, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art IT security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about cyber security, please visit
    https://www.siemens.com/cybersecurity#Ouraspiration.
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