Design Of Multifunctional Fieldbus And Ethernet Communication Conversion In Metro Substation

Fieldbus is a means of communication, and commonly used in the Substation Automation System equipment layer (layer processing). Station-level commonly used Ethernet technology. Because of equipment functional limitations, Metro Substation Automation Systems are often used more than two manufacturers of automation equipment. A spacing of the various communication protocols equipment (such as MODBUS, PROFIBUS) co-exist.Communication Card lead to the existence of multiple. We will increase the difficulty of maintaining, and reduces the real-time communications.How to achieve spacing equipment layer (network) and the station-level management (Information Network) integration is a current automation has not been fully resolved in the field of technical problems.To solve this problem, this paper, a Multi-Functional-Based Ethernut gateway platform to achieve a number of Fieldbus and Ethernet seamless connectivity.This paper UMT substation automation systems and the development trend of a feature to fieldbus equipment spacing layer in the application as the starting point, on the technical characteristics of fieldbus proposed substation automation UMT network systems exist.This thesis's starting point based on Ethernut embedded gateway design and realization. This thesis brings some applications on the embedded system in industrial control system. My investigation focus on the embedded gateway protocol which finishes the data conversion between Ethernet and equipment bus. This thesis bases on Ethernut Ethernet-Based solutions and 8-bit processors ATmeg128.And I transplanted Nut/OS embedded operating system, and through Nut/Net Ethernet protocol stack achieve the IP protocol .I also designed a Profibus Fieldbus and Ethernet interfaces and procedures, Canbus and Ethernet interfaces and procedures and serial port and Ethernet interfaces and procedures .AT last I achieve control of the enterprise network and information network seamlessly interconnected. This thesis discusses transplant method of the embedded operating system in ATmega128 Nut/OS and the realization of Ethernet TCP/IP stack access two different industrial Fieldbus in detail. This system designs an internet communications system include the conversion agreement, The system of functional integration, communication protocol conversion, software interface standard, Multi-user management, application software development and other aspects of some innovation. This is valuable for the design and promotional of the similar systems.