基于OPC UA的流式信息传输

OPC UA (Unified Architecture) is a new specification developed on the basis of classic OPC. It overcomes the limitations of classical OPC. With the advantages of platform independence and scalability, OPC UA is widely used in the filed of industrial control. Its common architecture is client/server mode. And information transfer is one of the most basic functions of OPC UA. Node-RED is a visual programming tool based on Node.js that allows to combine modules to write applications and make programming simpler. Node-RED has a display module that provides a more diverse selection of information. This paper designs a stream to create an OPC UA client by connecting OPC UA node modules in Node-RED. OPC UA client can connect to the OPC UA server and call services such as reading and writing, subscription, etc., to realize real-time monitoring and display of the workshop temperature, and to start the fan when the temperature is too high.