Studies On Application Of Industrial Ethernet

In the past 30 years,industrial network has been developed from analog-signal-based DCS system to Fieldbus control system (PCS) which is digital. Fieldbus indeed had brought a revolution in industrial automation. But the international standards of fieldbus were carried out so slowly,and about ten kinds of fieldbuses became international standards at the same time. The diversity of communication protocols of fieldbus makes it impossible to interconnection and inter operation among different kinds of fieldbus products,so many international standards are as no international standards. With the development of information technology such as Internet,the ability of seamless integration between management layer and field control layer is required as well as an open infrastructure. Ethernet,which is used in office and commercial environment,has gradually entered the industrial control field,and will become the international standard of industrial control field. According to the requirement of industrial control system,we discuss the key technical problems that must be solved in porting the traditional Ethernet to industrial control field such as real-time control and network security,at last,design a device platform that may be used in industrial fields.The main contents of this thesis is as follows:1. This thesis introduces the history of the development of Ethernet,the advantage and develop trends of application of Ethernet in industrial control field."2. Through the study of current industrial control system and the actual status of industrial control field,design an Ethernet structure used in industrial field with double redundancy ring.3. Analysis the real-time attribution and factors that affect the real-time attribution,provide some method to improve or solve the real-time attribution,also put forward some method to implement network security for the requirement of security of the industrial control network.4. Design the field device platform with low power and Ethernet,make use of the powerful CPU this hardware also has some other functions such as communication with modem' s bus and collect field data.5. The method of debug hardware/software of embedded system is described in detail,discuss the steps of booting code,the porting of operate system,initial code.We believe that industrial Ethernet will have a bright future in industrial control field,the development and application of embedded system will more deeply. Along with the resolve of key technology problems,the products combine with these two technologies will be used more and more broadly.