OPC UA Specification

Can you provide me specification for OPC Unified Architecture (OPC UA)?

[pawan]

OPC Unified Architecture (OPC UA) is an industrial M2M communication protocol for interoperability developed by the OPC Foundation.

The Foundation's goal for it was to provide a path forward from the original OPC communications model for process control, while enhancing security and providing an information model.

It was released in 2008, is a platform independent service-oriented architecture that integrates all the functionality of the individual OPC Classic specifications into one extensible framework.

Specifications

The OPC UA specification is a multi-part specification and consists of the following parts:
1. Concepts
2. Security Model
3. Address Space Model
4. Services
5. Information Model
6. Mappings
7. Profiles
8. Data Access
9. Alarms and Conditions
10. Programs
11. Historical Access
12. Discovery
13. Aggregates

In contrast to the COM-based specifications, the UA specifications are not pure application specifications.

They describe typically UA internal mechanisms, which get handled through the communication stack and are normally only of interest for those that port a stack to a specific target or those that want to implement their own UA stack.

The OPC UA application developers code against the OPC UA API and therefore mainly use API documentation. Nevertheless, part 3, 4, and 5 may be of interest for application developers.


OPC UA Specification