With the OPC UA .NET SDK, you connect .NET applications to OPC UA servers and provide your own OPC UA servers. With the OPC Classic add-on, the same client also accesses OPC DA, OPC HDA, and OPC AE servers.

Install

The SDK is available as a NuGet package. For clients, Opc.UaFx.Client is enough. For servers and for OPC Classic, use Opc.UaFx.Advanced:

Client

dotnet add package Opc.UaFx.Client

Client and server

dotnet add package Opc.UaFx.Advanced

Free, unlimited evaluation: the trial license runs for 30 minutes per application start. You do not need a license key for it. ZIP packages, builds for LabVIEW, Unity, and .NET Framework 3.5, and OPC Watch are available on the Downloads page.

Get started

Concept

OPC UA basics

Nodes, NodeIds and namespaces, address space, views, node managers, and services.

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Reference

Requirements

Target frameworks, runtime environments, and platforms the SDK supports.

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Tutorial

Getting started with the client

Connect to a server, read a value, and close the connection.

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Tutorial

Getting started with the server

Create a server, start it, and shut it down again.

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Topics

Client development

• Read and write values
• Browse nodes
• Subscriptions
• Events
• Long-running clients

All client development topics

Server development

• Provide data from a device
• Manage nodes
• Read and write values
• Historical data
• NodeSets

All server development topics

Security

• Understand certificates
• Users and roles
• Secure clients
• Secure servers

Licensing

• Licenses
• Set up the license

Resources

• Downloads
• Sample applications
• OPC Watch
• llms.txt: this documentation for AI assistants

Help and reference

• FAQ
• SDK internals
• Tracing
• Version history
• Upgrade to a new version

Reference

API reference

All classes, methods and properties of the SDK, by namespace and by topic.

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Get help

The FAQ page already answers many questions. If you do not find an answer there, our support team helps you, even during the evaluation:

E-mailsupport@traeger.deReply usually within one business dayPhone+49 961 48 23 0-0Mon. to Thu. 8:00⁠–⁠17:00 CETFri. 8:00⁠–⁠14:00 CETRequest formSend a requestWe get back to you within 24 hours

What helps us respond faster

Identification

• SDK variant
• version
• serial number¹

Problem

• description of the behavior
• steps to reproduce
• logs or screenshots

¹ Not required during the evaluation.