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Introduction

OPC Unified Architecture (OPC UA) is a cross-platform, open-source, IEC62541 standard for data exchange from sensors to cloud applications developed by the OPC Foundation.

OPCUA-client is a Ruby library to interact with OPC UA servers. There are projects in other languages to interact with OPC UA, such as:

• A C libary
• A python libary

How to get started?

UA Expert

UA Expert is a GUI OPC UA client that is also available for Linux. It’s easy to use and seems to be the standard.

• Add a server
  • Upper left in the project setting, at the server directory, right click and select add.

There are public OPC UA Test Servers that you can use for testing

• Unified Automation C++ Demo Server
  • Endpoint: opc.tcp://opcuaserver.com:48010
• Eclipse Milo Demo Server
  • Endpoint: opc.tcp://milo.digitalpetri.com:62541/milo
• Sterfive Node OPC UA Server
  • Endpoint: opc.tcp://opcuademo.sterfive.com:26543

For the latter, there are several Objects that we can read.

• Objects/Simulation/Dynamic/Scalar_Simulation. This has objects for many (all?) datatypes. We can use this to extend the functionality. The values of these objects are dynamic, meaning that they change all the time.
• Objects/Simulation/Static/Scalars. These are objects with static values that we can read and write.