.NET Based OPC UA Client SDK

The .NET based OPC UA SDK supports you in writing .NET OPC UA Clients. The Client SDK is also available as bundle with the Server SDK.

The UA SDK actually consists of three Libraries, the C# Base Library, C# Server Library and C# Client Library. The Base Library contains the native UA Stack and supports the UA Binary protocol and web service binding. When buying the Client SDK, you will receive a license for the Base Library and the Client Library.

The SDK supports .NET Framework 4.8 and Standard 2.1 (Core3.1) and comes with examples as Visual Studio 2019 project files including simple to use NuGet packages. Since SDK v3.2 we support also the new .NET 6.

The pre-built SDK binaries are pure .NET assemblies which means they can be used on any processor architecture supported by the .NET Framework. The SDK assemblies for .NET Standard 2.1 (Core 3.1) and .NET 6 can run on Windows and Linux.


Product Variants

Editions Windows Binary
License Types Binary Developer License (Single Seat), Evaluation License
Target Platforms Windows Desktop with .NET Framework 4.8 (comes with assemblies for 3.5,4.0,4.5)
Windows/Linux with .NET Standard 2.1 (Core3.1) and .NET6
Development MS Visual Studio Project Files for VS 2019, VS 2022

Read the complete software license agreement.

Supported Features and Profiles

  • Data Access
  • Events
  • Methods
  • Alarms & Conditions
  • Historical Access

More detailed information can be found on the next tab.

OPC UA Features and Profiles

Security None, Basic128Rsa15, Basic256, Basic256Sha256, Aes128-Sha256-RsaOaep, Aes256-Sha256-RsaPss
General Standard UA Client 2017 Profile, Base Client Behaviour Facet, Core 2017 Client Facet, AddressSpace Lookup Client Facet, Discovery Client Facet, Multi-Server Client Connection Facet, File Access Client Facet, Node Management Client Facet, Advanced Type Programming Client Facet, Diagnostic Client Facet, Redundant Client Facet, Redundant Switch Client Facet, Query, Global Certificate Management Client 2017 Profile, Global Discovery Client Facet, Global Certificate Management Client Facet, Multi-Server Client Connection Facet
Data Access Attribute Read Client Facet, Attribute Write Client Facet, DataChange Subscriber Client Facet, DataAccess Client Facet, Complex Data Types, Durable Subscription Client Facet
Events Event Subscriber Client Facet, Notifier and Source Hierarchy Client Facet, Auditing Client Facet, Auditing Client Facet
Methods Method Client Facet, File Access Client Facet
Alarms & Conditions A&C Simple Client Facet, A&C Address Space Instance Client Facet, A&C Enable Client Facet, A&C Alarm Client Facet, A&C Exclusive Alarm Client Facet, A&C Non-Exclusive Alarm Client Facet, A&C Previous Instance Client Facet, A&C Dialog Client Facet and A&E Proxy Facet, A&C Refresh2 Client Facet
Historical Access Historical Access Client Facet, Historical Data AtTime Client Facet, Historical Aggregate Client Facet, Historical Annotation Client Facet, Historical Access Modified Data Client Facet, Historical Data Insert Client Facet, Historical Data Update Client Facet, Historical Data Replace Client Facet, Historical Data Delete Client Facet, Historical Events Client Facet, Historical Event Insert Client Facet, Historical Event Update Client Facet, Historical Event Replace Client Facet, Historical Event Delete Client Facet

Scope of Supply

  • Base Library with integrated UA Stack, Client Library
  • Visual Studio project files, examples, tutorials, documentation
  • support package including 5 support incidents
  • first year maintenance package
  • one UaModeler runtime license

Related Products and Services


The UaGateway is designed to integrate “classic” OPC products into OPC UA Environments. Its main features are connecting UA clients to COM/DCOM Servers (Wrapper), accessing UA Servers with COM/DCOM clients (Proxy), and tunneling COM/DCOM through a secure UA connection. Please refer to the UaGateway product page for further information.

OPC UA Training

Unified Automation offers seminars, workshop, and hands-on classes to help you getting started with OPC UA and our SDK Products. Please refer to the following pages for more information.

It is also possible to book in-house training tailored to your company’s reqirements.


The book “OPC Unified Architecture” is written by Wolfgang Mahnke, Stefan-Helmut Leitner, and Matthias Damm, one of the trainers of Unified Automation.

“This book provides you a solid foundation to learn everything you could ever want to know about developing world-class products for multi-vendor interoperability based on OPC UA”, says Tom Burke, President of the OPC Foundation