Data Access Title: Data Access Description:

The original OPC Specification and its evolution from versions 1, 2.x, and 3.0, covering:


  • The concepts of OPC Client/Server technology and data definition
  • General activities which include defining an address space and browsing it, reading, writing, and subscribing for data update notifications
  • Detailed descriptions of interfaces, methods, parameters, and expected behaviors
  • Detailed descriptions of data types and structures
  • Sample code (OPC Server) containing interface definitions and error codes



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.


This specification is complete and no longer maintained.


Access: Paid Members
Version Status Description Date Posted
2.05a Release OPC DA 2.05 Specification 2012-06-28 Icon
1.10 Release OPC Common Specifications 2002-12-13 Icon
3.00 Release Errata Icon
3.00 Release Specification Icon
Version Status Description Date Posted
1.00 Release OPC Common Specifications 1998-10-27 Icon

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