ANSI C Based OPC UA Client SDK

The UA SDK is an ANSI C library designed for developing compact OPC UA Clients e.g. embedded or headless devices like PLC or railmount controllers and IPC. The ANSI C SDK is designed for single threaded use. The Client SDK is also available bundled with the Server SDK. Both use the same UA Base Library on top of the ANSI C OPC UA Stack.


Product Variants

EditionsSource Code
License TypesSource Code Developer License (Single Seat), Evaluation License
Target PlatformsWindows, Linux, vxWorks, QNX, EUROS, RTOS
DevelopmentCMake cross compile build environment
(can generate projects for Visual Studio, Eclipse, Makefiles …)

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, File Access Client Facet, Node Management Client Facet, Advanced Type Programming Client Facet, Diagnostic Client Facet, Query, Global Certificate Management Client 2017 Profile, Multi-Server Client Connection Facet
Data Access Attribute Read Client Facet, Attribute Write Client Facet, DataChange Subscriber Client Facet, DataAccess Client Facet
Events Base Event Processing Client Facet, Notifier and Source Hierarchy 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, 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

  • UA Stack, Base Library, Client Library
  • CMake build files for generating IDE project and makefiles
  • 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