OPC UA Communication

Reads or writes nodes on an OPC UA server. OPC UA is an industrial standard protocol for exchanging data in a standardized way between equipment that uses different communication methods; it is used for integrating PLC-based systems, smart factories, building automation, energy management, and more. Server connections are registered in Settings > OPC UA Client (Part 6).

OPC UA Client

Select the OPC UA client to use.

Commands

• Read (default): Reads the value of a node on the server.
• Write: Writes a value to a node on the server.

Fields

Node ID

Enter the ID of the node to read or write in the standard OPC UA NodeId format: the namespace number and the identifier joined by a semicolon, with s for a string identifier or i for a numeric one (for example, ns=2;s=Temperature or ns=3;i=1001).

Read Value

Select the variable that receives the value read. Variables of every type can be selected. Displayed only when Command is Read.

Value Type, Write Value

Select the type of the value to write, Digital, Number (default), Text, or Byte Array, and enter a value of that type in Write Value. Displayed only when Command is Write.