Node red series (28): communication with Siemens PLC based on OPC UA node

Preface

Siemens PLC Is a very common protocol , stay Node-RED There are similar nodes in support of this protocol , Communicate with hardware . The following is an introduction based on OPC UA Nodes and Siemens PLC To communicate .

Docking process

Install nodes ：node-red-contrib-opcua

The nodes included are as follows ：

Introduction to the official documentation of the module ：

usage ：

Use OpcUa-Item Defining variables . Use OpcUa-Client Read / write in / subscribe / Browse OPC UA The server .

To write node-red OPC UA Program for reading and writing variables ：

Because there is no hardware on hand ：

Therefore, software simulation is adopted to realize ：Kepware KepServer

Simulate a opc ua Server side , Specific software simulation process , I am not very clear . There is no introduction here .

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Node configuration process :

The configuration inside ：

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