Unified Architecture

Part 1: Overview and Concepts Title: Part 1: Overview and Concepts Description:

This specification provides a high-level introduction to the Unified Architecture technology covering:


  • Introduction of each of the OPC UA Specifications
  • Overview of the design, security, and scalability goals
  • Client/Server methodology used by OPC - Systems concepts of OPC, such as address-space, subscriptions, and events
  • Introduction of the concepts behind the Services (interfaces)

License: OPC Specifications Agreement of Use


OPC Foundation membership fees are used by the OPC Foundation for the continuous improvement of this specification, which includes bug-fixes and adding new features as required by the continuous advancement of the OPC Specifications.


Found a bug? Please report any bugs to our Mantis system. Click the "Tracking" tab for a list of current work items. We welcome your bug-fixes and kindly ask you to submit them via Mantis.


Have a Suggestion / Request for enhancement / New Features? Please Join an OPC Foundation Member Working Group (details may be found here). You may also submit requests to the OPC Foundation email address of. All suggestions become the property of the OPC Foundation.


Activities including bug-fixes and feature requests as reported in our Mantis bug-tracking system:



Access: Registered User
VersionStatusDescriptionDate Posted
1.04ReleaseOPC 10000-1 - Part 1: Overview and Concepts (ZIP/PDF)2017-11-22 Icon
VersionStatusDescriptionDate Posted
1.04.07Release Candidate2017-07-18 Icon
1.04.04Release CandidateZIP/DOCX2017-01-16 Icon
1.03.03Release CandidateZIP/DOCX (30-day review)2015-07-21 Icon
1.03ReleaseZIP/PDF2015-10-10 Icon
1.02.4Release Candidate Icon
1.02ReleaseZIP/PDF2012-07-10 Icon
1.01.03Release Candidate Icon
1.01Release Icon
1.00Release Icon