The OPC UA (Open Platform Communications Unified Architecture) protocol provides a publish-subscribe client-server technology for reliable data transmission. Its architecture ensures more secure communication than its OPC predecessor, OPC DA. The OPC UA protocol offers a solution for industrial IoT because it interacts with dedicated controllers and sensors, as well as with large enterprise databases and data analysis systems.

When handling devices that implement OPC UA, Litmus Edge is deployed either as an OPC UA server or an OPC UA client.

The following diagram shows how OPC works with Litmus Edge.

The OPC UA protocol works with a wide variety of security models and transport layers. IoT applications face the following challenges.

OPC UA servers can have hundreds of different configurations:

OPC UA Includes Windows-Specific Features 

OPC UA evolved from the OPC DA (Data Access) protocol, where the clients and servers worked only in Windows. Therefore, many of the OPC UA native features, such as Discovery, work well only in Windows.

For example, when the TCP connection is on a Windows server, Litmus Edge cannot connect to it, even if other Windows-based agents can connect. Windows imposes this restriction.

As an additional challenge, not all OPC UA security policies match standard software security policy practices.

 represents complex technology and it requires some effort to generate these certificates.

, but it has its own certificate manager, which supports different encryption levels.

The OPC UA protocol provides a publish-subscribe client-server technology for reliable data transmission.

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OPC UA Server

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OPC UA Server | Litmus Automation Documentation

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Use the Switch Processor Function

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