In order to expand the remote function of PLC controller,this paper proposes an Ethernet component exten-sion system based on CoDeSys,and the device description file and software system of the extension component are de-signed and implemented.By studying the CoDeSys development mode and remote component extension method,the de-vice file is used to describe the remote Ethernet master/slave station and component.Based on Ethernet and backboard communication,the expansion of PLC remote component is realized.The network mode of the system is flexible,supports a variety of topological structures,and is suitable for complex and changeable industrial field applications.
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