Sets both read and write operation timeouts on a Modbus slave.

You can also use the Property Node to set the read operation timeout, write operation timeout, or both timeouts.


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Inputs/Outputs

  • cModbus_Masterlvclass.png Modbus master in —

    Modbus master in specifies the reference to the Modbus master instance. Use the Create Master Instance VI to create a Modbus master instance.

  • ci32.png read operation timeout (ms) —

    read operation timeout specifies the read operation timeout in milliseconds. If you specify -1 for read operation timeout, the read operation does not time out until the Modbus slave responds.

  • ci32.png write operation timeout (ms) —

    write operation timeout specifies the write operation timeout in milliseconds. If you specify -1 for write operation timeout, the write operation does not time out until the Modbus slave responds.

  • cerrcodeclst.png error in (no error) —

    error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

  • iModbus_Masterlvclass.png Modbus master out —

    Modbus master out returns a duplicate of Modbus master in.

  • ierrcodeclst.png error out —

    error out contains error information. This output provides standard error out functionality.

    • Set Timeouts Details

    The Set Timeouts VI enables you to use a single Modbus master instance to perform read or write operations with different timeouts on different Modbus slaves simultaneously, as shown in the following block diagram:

    The following list describes important details about the previous diagram:

    When the TCP master instance 1 output performs read and write operations on a Modbus slave, the timeouts are both 5,000 ms, which is the default value.
    When the TCP master instance 2 output performs read operations on a Modbus slave, the timeout is 4,000 ms. When this output performs write operations, the timeout is 6,000 ms.