| With the development of computer and network technology,now fieldbus,which have feature of intelligentized instruments and distributed control,rapidly cover the every administrative levels from locale equipment level of industroy to control and managing,come into a emterprise information system based on network integration auto control sysytem step by step.But now,fieldbus is still in a developing stage.And today we have serveral different fieldbus products,and thet can not promise to connect to each other.It's against the compatibel principle required by fieldbus. At the same time, with the success in local area network, Ethernet is applied in industry control system quickly. In the future, the standard of fieldbus can't uniform, fieldbus should integrate with Ethernet to form a mix control network configuration. It's can server the problem of entirely distribution, entirely open, and multiple fieldbus control system integration in control system. It's also enriching the system configuration of control system.The article along the research direction that fieldbus will close to Ethernet in the near future,then we can achieve the multiple fieldbus integration,by the analyzing the characteristic of the familiar fieldbuses and their protocol,with the familiar protocols of tunnel technology,researches the method of connection between with fieldbus and Ethernet via simply router. With the tunnel, encapsulation and pack the data between fieldbus and Ethernet can transfer the data between fieldbus and Ethernet,so we can interlinkagate the Ethernet and fieldbus.At last, emluate the interlinkagation of Ethernet and fieldbus with socket technology.The emulation shows that Ethernet can communicate with fieldbus device well,is competent for the demand of industry control network. At last, give the prospect of Ethernet and fieldbus application. They will combine tightly together, form a mix control network, and form an entirely open, entirely distribute, network control system in the end.
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