Several popular fieldbus technology are introduced briefly and features of each fieldbus are explained. In order to apply popular fieldbus technology to terminal unit of distribution automation,realization of implement the hardware circuit of terminal unit of distribution automation with PROFIBUS-DP is given.%对国外的几种较流行的现场总线技术作了简要介绍，并对每种总线的特点作了说明，讨论了配电自动化终端所应具备的功能，为了将流行的现场总线技术应用于配电自动化终端，给出了基于PROFIBUS-DP总线技术的配电自动化终端的实现电路。
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