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Research of Interface Technology and Communication Protocol Based on Industrial Field-bus and Ethernet

Author: LuChao
Tutor: ZhangZuoHuang
School: Jiangnan University
Course: Applied Computer Technology
Keywords: Fieldbus Industrial Ethernet Profibus DP Interface Technology Real-Time Protocol LLC
CLC: TP273
Type: Master's thesis
Year: 2006
Downloads: 893
Quote: 7
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Abstract


Field bus technology is widely applied in the field of industrial automation and industrial control network the bottom of the device-level communication technology-led. But for a long time, the diversity of the fieldbus standard and incompatible hinder the further development of fieldbus technology, system integration and information integration faces many difficulties. The emergence of Ethernet in the field of industrial control applications - Industrial Ethernet offers the possibility to solve the above problem. Industrial Ethernet in enterprise integrated automation system of information management, process monitoring layer has been widely used, the successful implementation of high-level information network with the underlying control network integration. In real-time industrial Ethernet, uncertainties and other key issues to be fully improved industrial Ethernet in the lowest level of industrial control equipment level can also be promoted. Ultimately from the field device level to the management of the seamless connection and integration of information has become the target of control network development and trends, so fieldbus network with Ethernet connectivity as well as a deeper level of mutual integration of exploration and research has a strong The practical significance and application value. In this paper, industrial field bus and Ethernet merging two levels of study and discussion: interface technology, communication protocols, and improved real-time Ethernet protocol. Interface Technology Design and Implementation of Profibus DP and Ethernet interface unit. The interface unit with ATmega128 microcontroller as the core, the LAN91C111 the structure of the additional Profibus DP bus protocol chip SPC3 and Ethernet controllers. DP field bus slave interface, which SPC3 integrated the complete Profibus DP protocol; constituted by the ATmega128 and LAN91C111 Ethernet interface, and simplify the implementation of the TCP / IP protocol stack; All network protocol conversion function from ATmega128 ATmega128 and SPC3 control. Interface unit test to verify the interface unit data transmission and protocol conversion functions to achieve the real-time performance and communication interface unit distance were tested. The realization of the interface unit provides a reliable, inexpensive solution for a high level of industrial automation systems integration goals. The communication protocol of the study is to analyze the bottom of Ethernet in industrial automation systems - device-level feasibility reference Profibus DP fieldbus protocol explore a real-time Ethernet protocol to improve the program. Improved real-time protocol is based on Ethernet LLC sublayer of the data link layer, and Profibus DP protocol architecture in the Ethernet data link layer. Ethernet can be adapted to the requirements of real-time communication can be applied to the device level, and to maintain compatibility with existing Profibus DP fieldbus. The OPNET Modeler8.1 protocol simulation and performance testing results show that: the real-time protocol master shared network in good working condition, there is no obvious data delayed; appropriate cycle time, you can also reach than the Profibus DP higher transmission efficiency. Improved communication protocol and real-time Ethernet protocol level to the end of the industrial automation systems integration a discussion.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
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