一．概述当今的年代是一个技术飞速发展的年代，是一个环球市场竞争的年代，是一个几乎找不到卖方市场的年代。自控界受控制系统理论、计算机技术。网络通信技术、机械加工技术的影响，新产品层出不穷。我们知道，自动控制系统的发展大概经历了从分散到集中，由集中到相对分散 one. Overview Today’s era is an era of rapid technological development, is a global market competition era, is almost impossible to find the seller’s market era. Controlled by the control system theory, computer technology. Network communication technology, mechanical processing technology, an endless stream of new products. We know that the development of automatic control system probably experienced from decentralized to centralized, from concentrated to relatively dispersed