OPC UA – Structured data up to the cloud

Smart. Semantic. The open, Ethernet-based communication standard OPC UA (Open Platform Communications Unified Architecture) offers optimal conditions for digitalization. Ideal for communication between machines and vertical connectivity to the cloud. For real-time communication at the field level, Siemens combines OPC UA with PROFINET in a common Industrial Ethernet network.

Standardization is the key to managing complexity.

Learn how standardization can save you time and money, make you more flexible and get you to market faster. Our customers explain how they were able to benefit from standardization, e.g. by using the open communication standard OPC UA or Module Type Package (MTP).

OPC UA – A milestone for digital automation

Convergent, end-to-end, secured networks are needed to meet the requirements of tomorrow’s industry. Networks that are flexibly scalable, dynamically adaptable, and able to accommodate large numbers of users with extremely fast response times. OPC UA is key component for to achieving these goals.

Speed up the transformation to the digital factory with OPC UA 

The open, platform-neutral, and flexibly scalable communication standard OPC UA features a unique information model. With its semantic capabilities, OPC UA supports more than just data transmission. Proven mechanisms like authentication, authorization, and encryption guarantee security. In addition, PROFIsafe mechanisms are being prepared to permit uniform, safety-related communication with OPC UA. Moreover, OPC UA can run on the existing PROFINET infrastructure without compromising performance.

Siemens relies on OPC UA as the interface from the control level to higher-level SCADA, MES, and ERP systems all the way to the cloud.

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Virtual Event, Nov 15 - Nov 16, 2022

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Sign up now for free and join the SPS Virtual Tech Days on November 15th and 16th.

This digital event is all about innovation in industrial automation and digitization and provides answers to the question of how your company can also become a Digital Enterprise – fast and at scale.

Line integration with OPC UA

OPC UA and its companion specifications enable fast and cost-effective line integration with high scalability, fault-free commissioning, and a fast factory acceptance test. Thanks to the internationally defined OPC UA companion specifications, you benefit from the line integration of standardized data interfaces and status models – allowing you, for example, to easily adapt machine interfaces and reuse modules for different plants.

Communication mechanisms for different requirements

OPC UA client/server

OPC UA with client/server communication is used extensively in automation. With this proven, one-to-one communication mechanism, each OPC UA client obtains access to the data on the OPC UA server via point-to-point communication. The OPC UA client sends a request to the OPC UA server, from which it receives a response. This allows for a reliable, secure, encrypted data exchange with reduced bandwidth and no loss of data, even if the environment and network quality are sub-optimal and are experiencing disturbances. Client/server communication is always based on TCP/IP.


In the OPC UA with PubSub (publish/subscribe) model, a one-to-many or many-to-one communication mechanism is used: A publisher makes data available that can be received by any number of subscribers in the network. OPC UA PubSub communication can be transmitted via UDP or directly on layer 2. Depending on the technology used, this can result in short cycle times. In conjunction with Time-Sensitive Networking (TSN), OPC UA PubSub therefore enables real-time communication at the control level and meets the demands of time-critical applications.

Time-Sensitive Networking – The new foundation for OPC UA

Guaranteed, scalable bandwidths, optimized Quality of Service (QoS) mechanisms, real-time capability, and very low transmission latency: Siemens relies on Time-Sensitive Networking (TSN) to get the very best out of automation networks, together with even faster and more reliable communication from machine to machine and from machine all the way up to the operator level.

Good reasons to use OPC UA

Products and systems with OPC UA interface and supporting tools

Siemens offers a comprehensive hardware and software portfolio for Totally Integrated Automation (TIA) that extends from the field level to the control and operater levels. As an open communication standard, OPC UA plays an important role for the entire TIA portfolio.

One step ahead with the OPC UA webinars

Visit our webinar series on all aspects of OPC UA, where our experienced experts provide simple and clear explanations of important topics relating to the Ethernet-based communications standard.

Development with outstanding prospects

Open Platform Communications – Unified Architecture (OPC UA) was developed by the OPC Foundation, which was created in 1996 with Siemens as a founding member. The OPC Foundation is an international nonprofit organization with over 850 members from all sectors of industry. It works closely with users and vendors to continually optimize the open, vendor-independent standard.

Downloads and support for OPC UA

Take advantage of additional sources of information to learn more about OPC UA, the open communication standard for the digital future and Industrie 4.0. Brochures, informational materials, technical data, FAQs, and services – you’ll find them all here!

Support Services

In case of an emergency, Digital Enterprise Services offer you a wide range of services - by phone and online, anytime and anywhere with online support, technical support, the Siemens Industry Service Card and Managed System Services.

Spare Parts Services

he Spare Parts Services from Digital Enterprise Services are available worldwide and ensure a smooth and fast delivery of spare parts - and thus optimal system availability. 

Training Services

Industrial learning for every need with training services, continuously and sustainably. Our experts from SITRAIN and Vizendo Virtual Training Solutions offer the right training for you - classroom trainings, online or virtually. 

The latest on OPC UA

We provide you with the latest information on new OPC UA products and features, standard-related publications and media, and details about trade shows and events where you can visit us and let us answer your questions.
Teaser Cybersecurity for Industry
Cybersecurity for Industry

Security information

In order to protect plants, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial security concept. Siemens’ products and solutions only form one element of such a concept. For more information about industrial security, please visit.

Our experts are ready to help

Do you want to know more about OPC UA and the Siemens strategy? Would you like more specific information on how OPC UA and PROFINET will interact in the future? Our experts are happy to help.