Read Discrete Inputs VI

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

starting address specifies the initial address for the read operation. Valid values are between 0 and 65,535, where 65,535 is the maximum number.

The address that this VI reads is 0-based, meaning that the address numbering convention for the Modbus slave starts at 0.

number of discrete inputs specifies the number of discrete inputs you want to read. Valid values are between 1 and 2,000, where 2,000 is the maximum number. After you specify a value for number of discrete inputs, check the value you specify for starting address. Ensure that you do not use this VI to read the value of a discrete input whose address is larger than 65,535.

Otherwise, LabVIEW returns error code -389113.

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

Modbus master out returns a duplicate of Modbus master in.

discrete input values returns the discrete input values.

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