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For further information on the OPC UA, please see attached below the OPC UA Open IEC 62 541 (current) Standard specification Documentation from Jan 2021.

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Part 100 Device Interface, and Part 200 Industrial Automation are also available. These build on the Core set of Specifications, and adds new common definitions that then are used in different companion specifications. E.g. both OPC UA for Analyser Devices and OPC UA for Machinery builds directly on part 100.

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.