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Welcome to the OPC Foundation's Wiki page. This Wiki is used to present technology-related information about OPC UA.
OPC UA (OPC Unified Architecture) is the main technology standard of the OPC Foundation. For information about the OPC Foundation go to


OPC UA Overview

UA Framework.JPG

OPC UA a service-oriented communication framework for the exchange of information models. It is a feature-rich standard designed to address the current and projected needs for systems integration in a large variety of application domains including for example Industrial Automation, Building Automation, Power Generation and Distribution, Oil and Gas exploration.

OPC UA Capabilities

The functionality of an OPC UA Application is defined by the supported capabilities. Each application has to support a core set of features (required capabilities). Advanced capabilities are defined extensions of the core set of features. Support of such advanced OPC UA features assures broader applicability and a with that a higher degree of interoperability than what can be achieved with the core set of features.

It is recommended that the support of OPC UA Capabilities is advertised by listing the corresponding capability names inside product documentation and product data sheets. By understanding the Capabilities and their significance, end-users can identify and differentiate the functionality of OPC UA Applications.

OPC UA - Frequently asked questions

How to develop


  • from scratch (Part 6) - tough option, probably a 2 year plus effort
  • with stack only
  • with SDK
  • open source / license

Testing and Certification

  • Sample servers and clients
  • compliance - CTT
  • IOP
  • Test lab


  • Where can I get more support (vendors that offer support)
  • Benefits for becoming an OPC member (certification, join WGs, RCL for stacks, marketing)
  • Item3