在工业生产过程中,1969年面世的plc和1975年面世的DCS可能是两类影响最为深远的计算机操控系统。PLC 的面世替代了继电器之类的器材,完成了开关量的连锁操控、程序操控;DCS的面世替代了显现仪、调节器之类的外表,完成了模拟量的指示、记载和PID回路调节等功能。20世纪80年代晚期,跟着计算机技能、通讯技能、集成电路技能、智能传感器技能的开展而呈现的现场总线操控系统(Fieldbus Control System , FCS )改变了原有操控系统的构造,使操控系统由关闭向敞开走出了主要的一步。20世纪90年代中期,以PC为根底的操控系统(PC-Based Control System,PCBCS)开始呈现,不少专家以为它将是工业自动化范畴最具开展潜力的新技能,他们将PCBCS 与PLC 、DCS、 (或许再加上FCS)并称为工业生产过程三大(或四大)操控系统。甚至有人在四年以前的文章中就谈到"多数人以为在往后十年内PC操控将逐渐替代传统的PLC或DCS"。而德国菲尼克斯(PHOENIX CONTACT)公司的专家介绍:简直一切的咨询机构都以为到2005年,PC为根底的操控系统将占商场分额的50%以上。
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