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０ 引言自８０年代初智能变送器问世以来的十几年时间中，智能变送器以远远超过模拟变送器的技术性能、方便的安装和维护等优势不断地扩大在生产中的应用，开创了现场仪表的新纪元［４］。智能变送器的核心技术之一是现场总线技术，其中Ｒｏｓｅｍｏｕｎｔ公司于８０年代中期?
0 Introduction Since the advent of intelligent transmitters in the early 1980s, intelligent transmitters have been expanding their use in production to beyond the technical capabilities of analog transmitters, ease of installation and maintenance , Creating a new era of field instrumentation [4]. One of the core technologies of smart transmitters is fieldbus technology, which Rosemount company in the mid-80s?