对六自由度并联转台的结构进行了分析，给出了转台的运动指标参数，并采用分散控制方式对整个系统的控制系统进行了设计。

Summary: the structure of the 6dof parallel platform is analyzed and the movement parameters of the platform is given, the decentralized control of the whole control system is designed.

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通过采用以太网星形结构的网络连接方式，将分散控制系统由总线形网络拓朴结构改为星形网络拓扑结构。

Through using network connecting mode of ether star structure, the distribubuted control system has been changed from busbar network topologic structure into a star network topologic structure.

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介绍了汽轮机保护系统常见的两种实现方式，一是在分散控制系统中实现汽轮机保护系统，二是运用可编程控制器实现汽轮机保护系统。

This paper introduces two common ways to implement protection system of steam turbine, one is to fulfil it in Distrubuted Control system and the other is to use Programmable Logic Controller.

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