. OPC Unified Architecture Part 5: Information Model. Release 1.04. 2017-11-22. , OPC Foundation, 2017.

This document defines the Information Model of OPC Unified Architecture (OPC UA). The specification describes standardized Nodes within the Server's Address Space, including standard types and instances used for diagnostics or implemented as entry points to server-specific nodes. The document also covers common attributes, standard object types, variable types, reference types, and data types, as well as normative annexes such as State Machines and File Transfer.