.NET Based OPC UA Client & Server SDK (Bundle)

The UA SDK consist of three assemblies that support you in writing .NET OPC UA Servers and Clients. 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.

The .NET based Server SDK is bundled with the Client SDK. See the Client SDK product page for more information.

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.


Supported OPC UA Services

  • FindServer, GetEndpoints
  • CreateSession, ActivateSession, CloseSession
  • Browse, Translate, RegisterNodes, UnregisterNodes
  • Read, HistoryRead
  • Write, HistoryUpdate
  • Call
  • CreateSubscription, ModifySubscription, DeleteSusbcription, TransferSubscriptions
  • CreateMonitoredItems, ModifyMonitoredItems, DeleteMonitoredItems
  • Publish, Republish

The OPC Founfation logo is the property of The OPC Foundation and is used under license.

Product Variants

Editions Windows Binary
License Types Binary Developer License (single seat), Evaluation License
Target Platforms Windows Desktop with .NET Framework 4.8 (has 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 and VS2022

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(default-off), Basic256(default-off), Basic256Sha256, Aes128-Sha256-RsaOaep, Aes256-Sha256-RsaPss(.NET4.8 and Core 2.0/3.1)
General Standard 2017 UA Server Profile, Node Management Server Facet, Client Redundancy Facet, Redundancy Visible Server Facet, Global Certificate Management Server Facet
Data Access DataAccess Server Facet, ComplexType 2017 Server Facet.
Events Standard Event Subscription Server Facet, Address Space Notifier Server Facet, Auditing Server Facet
Methods Method Server Facet, State Machine Server Facet, File Access Server Facet
Alarms & Conditions A&C Simple Server Facet, A&C Address Space Instance Server Facet, A&C Enable Server Facet, A&C Alarm Server Facet, A&C Acknowledgeable Alarm Server Facet, A&C Exclusive Alarming Server Facet, A&C Non-Exclusive Alarming Server Facet, A&C Previous Instances Server Facet, A&C Dialog Server Facet, A&C Refresh2 Server Facet
Historical Access Historical Raw Data Server Facet, Historical Aggregate Server Facet, Historical Data AtTime Server Facet, Historical Access Modified Data Server Facet, Historical Annotation Server Facet, Historical Data Insert Server Facet, Historical Data Update Server Facet, Historical Data Replace Server Facet, Historical Data Delete Server Facet, Historical Access Structured Data Server Facet, Base Historical Event Server Facet, Historical Event Update Server Facet, Historical Event Replace Server Facet, Historical Event Insert Server Facet, Historical Event Delete Server Facet

Scope of Supply

  • Base Library with integrated UA Stack, Server Library, Client Library
  • Visual Studio project files, examples, tutorials, documentation
  • support package including 15 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