Abstract
OPC UA is a new specification developed on the basis of classic OPC. It overcomes the limitations of classic OPC, has the advantages of platform independence and scalability, and is widely used in industrial fields. Node-Red is a visual programming tool based on node.js that allows you to combine modules to write applications and make programming simpler. This paper designs a Node-Red to create a stream as an OPC UA client by connecting OPC UA related node modules, 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 start the fan when the temperature is too high. In addition, Node-Red has a display module that provides a more diverse selection of information.
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