Research And Design Of Embedded Network Controller

With the development of computer, as well as communication and control technology, the traditional industry control field is going through an unprecedented change, developing towards network. But many traditional industry equipments constitute lightweight networks based on correspondence connection such as the ProfiBus,FF,CAN,Lon Work. On the one hand, those equipments cannot connect with the Internet/Intranet directly. On the other hand, the agreement standard is not unified, which created a significant obstacle for various manufacturers. Therefore, the current industrial control technology had a new development direction of industry Ethernet technology. But at present many manufacturers adopted IPv4 industry Ethernet technology application industrial control, but exists real-time problem. In order to meet the future industry control needs, this paper has researched the next generation network protocol——IPv6 protocol, and applies it in the network control system to partly enhance real-time of system and reduce the end-to-end delay.First,this paper analyzed the development process of network control systems, pointed out some flaws in Industrial Ethernet of IPv4, such as short of network address, network transmission retards, data packet loss and chaotic. Then from the perspective of network communication gives four ways to improve the real-time of network control systems. They are the full-duplex switched Ethernet, VLAN, Qos service quality and the IPv6 technology. Then, from theory point of view, analysis the real-time strategy which used in this paper. In this paper, on hardware side, selected LPC2210 controller and is equipped with RTL8019AS Ethernet interface. On software side selectedμC / OS-II operating system. Then, design of embedded IPv6 protocol stack and ported to the above platform. Finally, the paper analysis the performance of network control system based on IPv6. Based on setting up laboratory environment to support dual-stack network, throght change the jammer's bidding to control the network delay, this paper verified the difference between two different communication protocol ways in control system.Experiments show that use of the improved IPv6 protocol stacks, which support for priority communicate in control system is better than the standard IPv4 protocol stack, in the field of real-time and data packet. At the same time demonstrated the system's dynamic performance and steady-state performance will be better than the IPv4 .At present, the industry Ethernet unified standards have not been worked out, taking into account the longitudinal development of Internet technology IPv6 will replace IPv4, at present the IPv6 protocol some standards has not been formally identified, we can use this feature and conjunction with the need of industrial Ethernet, change some head label of IPv6 in order to ensure the real-time of Ethernet, develop an uniform standards based on IPv6 for industrial Ethernet networks control. This article is part of the attempts carried out for the next stage of the network control system to provide a direction for development and research.