OPC UA Adds Standardized REST Interface

May 9, 2023
The OPC Foundation says this addition is a significant step forward in ensuring the interoperability of industrial automation and IoT systems by allowing IT applications to access to OPC UA data.

The OPC UA standard has been expanded by the OPC Foundation to add a RESTful interface that allows remote access to information in more than 90 standardized IT application models.

The OPC Foundation says this extension was requested by IT companies that “need the ability to utilize data from operations technology for use in concepts such as data spaces, digital twins and metaverse applications.”

With the addition of HTTP REST, applications outside the OPC UA ecosystem can now access OPC UA information. The OPC Foundation notes that the OPC UA specification includes “the transfer of meta-information such as server timestamp, source timestamp, value and quality of the individual information. The expansion of OPC UA with REST is less likely to be adopted at the field level, but in gateways and cloud services. Cloud companies can now access standardized information and use it efficiently to optimize the business processes of their customers and unlock new use cases.”

Stefan Hoppe, president and executive director of the OPC Foundation, says, "This extension of OPC UA with a standardized mapping to a RESTful interface is a significant step forward in ensuring the interoperability of industrial automation and IoT systems. By enabling access to information provided by implementations of over 90 OPC UA domain specific information models through standardized RESTful APIs, we are making it easier for developers to create OPC UA-enabled applications that can communicate with other web-based systems and applications."

The REST group, as a sub-group of the OPC Foundation UA Working Group, will meet to discuss use cases for OPC UA in edge and cloud computing environments using the proposed HTTP REST interface. Examples for work items include:

  • Generic REST interface definition for common OPC UA services (e.g., read, write, call).
  • Standardized mapping of OPC UA service parameters to datatypes commonly used in RESTful APIs.
  • How the existing session-less OPC UA service can be used with a REST interface.
  • Define a concept to provide REST interfaces for companion specification use cases.
  • Define requirements for security.

Companies in this Article

Sponsored Recommendations

Measurement instrumentation for improving hydrogen storage and transport

Hydrogen provides a decarbonization opportunity. Learn more about maximizing the potential of hydrogen.

Learn About: Micro Motion™ 4700 Config I/O Coriolis Transmitter

An Advanced Transmitter that Expands Connectivity

Learn about: Micro Motion G-Series Coriolis Flow and Density Meters

The Micro Motion G-Series is designed to help you access the benefits of Coriolis technology even when available space is limited.

Micro Motion 4700 Coriolis Configurable Inputs and Outputs Transmitter

The Micro Motion 4700 Coriolis Transmitter offers a compact C1D1 (Zone 1) housing. Bluetooth and Smart Meter Verification are available.