1Graphical interface

 

2Function

The <OPC_read> block is used to retrieve the value of an OPC UA variable.

Refer to the documentation for the Python “opcua” module for more details.

3Input

• •« Var » : This is an “opcua” object representing an OPC UA variable; this object comes from an <OPC_var> block. The default value is None 

4Outputs

• •« Value » : This is the value of the OPC UA variable 

• •« Status » : 0=OK, -1=Python exception, -2=OPC UA variable not configured 

5Types

The “Var” input is of a type defined by the “opcua” Python module; the “Value” output is of the same type as the OPC UA variable.