OPC UA is codified by the IEC 62541 standard, divided into several parts (Part 1 Overview, Part 3 Address Space, Part 4 Services, Part 5 Information Model, Part 6 Mappings, Part 7 Profiles, etc.), and maintained jointly by the OPC Foundation and the IEC TC65 committee.
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IEC 62541 is the official multi-part standard for OPC UA. Part 1 covers Overview and Concepts. Part 3 specifies the Address Space Model. Part 4 defines the Services. Part 5 specifies the Information Model. Part 6 describes the Mappings (transport and encoding). Part 7 lists the Profiles used for conformity testing. Part 8 deals with Data Access, and Parts 9-14 address specific domains. Preview versions of the parts are available on the OPC Foundation site at no cost, while the official IEC publications are paid (the full set is on the order of EUR 3 000).
Bookmark the OPC Foundation "Reference Online" pages: the free preview parts are sufficient for day-to-day engineering work and are kept in sync with the paid IEC release.
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