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    Does SoMachine Basic support READ_VAR/WRITE_VAR Functions?

    Yes, as of SoMachine Basic version 1.3. Patch 1
    Double-click on the function block to open the function properties table.
    The %READ_VAR function block has the following properties:
    Activated / deactivated checkbox
    Indicates whether the address is in use.
    %READ_VARi, where i is from 0 to the number of objects available on this logic controller
    i is the instance identifier. For the maximum number of instances, refer to Maximum Number of Objects table.
    User-defined text
    The symbol uniquely identifies this object. For details, refer to the SoMachine Basic Operating Guide (Defining and Using Symbols).
    • SL1: Serial 1
    • SL2: Serial 2
    • ETH1: Ethernet
    Port selection
    NOTE: SL2 and ETH1 embedded communication ports are available on certain controller references only.
    This parameter depends on the link configuration:
    • 1...247 for serial lines slave address
    • 1...16 for Ethernet index
    Device identifier
    For more details about the Ethernet index, refer to Adding Remote Servers.
    The unit is in ms, with a default of 100.
    A value of 0 means no timeout enforced.
    The timeout sets the maximum time to wait to receive an answer.
    If the timeout expires, the exchange terminates in error with an error code (CommError = 01 hex). If the system receives a response after the timeout expiration, this response is ignored.
    NOTE: The timeout set on the function block overrides the value configured into SoMachine Basic configuration screens (Modbus TCP Configuration and Serial Line Configuration).
    The type of objects to read:
    • %MW (Mbs Fct 3): memory words (default)
    • %I (Mbs Fct 2): input bits
    • %Q (Mbs Fct 1): output bits
    • %IW (Mbs Fct 4): input words
    The types of Modbus read function codes are:
    • Mbs Fct 3: equivalent to Modbus function code 03
    • Mbs Fct 2: equivalent to Modbus function code 02
    • Mbs Fct 1: equivalent to Modbus function code 01
    • Mbs Fct 4: equivalent to Modbus function code 04
    Address of the first object to read.
    • 0...124 for %MW
    • 0...127 for %I
    • 0...127 for %Q
    • 0...124 for %IW
    Number of objects to read
    The first address of the word table to which read values are stored (%MW).
    User-defined text
    A comment to associate with this object.

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