Embedded Web-based Real-time Ethernet Distributed Control System

This thesis is organized as follows:1) The application of integrating Ethernet and Web technologies into control systems is briefly described. The characteristics of DCSs FCSs Ethernet-based Control systems are compared in details. It is pointed out that the application of Ethernet to industrial control is an important trend. All the problems which the thesis will solve and the basic concepts are listed in order to help readers to understand.2) The performance of Ethernet applied to automatic control is the focus discussed by engineers and researchers. Through simulations,the comparison of the performances and characteristics of Ethernet ControlNet and DeviceNet are given.3) The traditional Ethernet based on shared communication channels is not suitable for hard real-time control systems. So several technologies are adopted to solve the problem. These technologies includes switching,full-duplex communication mode,VLAN and QoS,which are used to make the Ethernet real-time.4) Because of the openness attribute,the system security is challenged. To increase the system security,technologies such as data encryption,digital signature,authentication technology,access control etc. are discussed.5) After comparing Ethernet-based control systems with traditional control systems,it is obvious that the system we designed is of significance to the research of computer integrating plant automation (CIPA). Several methods of integrating control networks with information networks are discussed. The system we designed is described in detail.6) It is shown that the embedded controller we designed is a very important device,which is linked to the Ethernet-based control system. In this chapter we give details of the controller design. The structure of the embedded controller the selection of the core chip the design of interface circuit and the realization of Embedded Web Server etc. are given in details.7) Finally several problems,which are also important to the application of Ethernet to industrial automation,are given in order to remind the readers who are interested in the technologies of Ethernet and Internet applied to industrial automation.