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Modbus protocol is a common language used in the electronic controller. Through this protocol, the controller can communicate with each other through the network and other devices. The paper describes the network communication between S7-300 PLC and third party device through the CP341 module, gives the specific communication protocol, technical solutions for the problem, and some examples of the implementation code.

, authors=Zhi-hui TU, Shi-chen GAO, authorsList=Zhi-hui TU, Shi-chen GAO, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1319263350052213311, articleId=1319263348072501821, tenantId=1146029695717560320, journalId=1185652524569653253, language=CN, title=S7-300与第三方设备Modbus通讯的实现, columnId=1319263345866297891, journalTitle=包钢科技, columnName=节能环保与装备自动化, runingTitle=null, highlight=null, articleAbstract=

Modbus协议是应用于电子控制器上的一种通用语言。通过此协议，控制器相互之间、经由网络和其它设备之间可以通信。文章讲述了S7-300 PLC通过CP341模块与第三方设备之间的网络通讯，给出了具体的通讯协议，技术问题的解决思路，以及部分实现代码示例。

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涂智辉（1981-），男，四川省达州市人，工程硕士，工程师，现从事自动控制系统设计与开发方面的工作。

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涂智辉（1981-），男，四川省达州市人，工程硕士，工程师，现从事自动控制系统设计与开发方面的工作。

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