140xCA71706
140xCA71706
--DCS的字面定义是“分布式控制系统（distributed control system)"是从系统结构上定义的。最早的概念来源于石油化工行业的计算机控制（大）系统。连续过程控制能力很强。
--PLC的字面定义是“可编程逻辑控制器（programable logic controller)"是从功能上定义的概念。概念最早指机械加工行业的计算机化逻辑控制装置。开关量处理能力强。最早的PLC系统较小。
--现代的DCS和PLC的区别已越来越小。DCS处理连续量和开关量的能力都很强。PLC处理连续量的能力也越来越大，大型PLC系统结构上也是分布式的。
--顺便介绍一个SCADA系统，这个概念发源于电力行业，也是从系统功能上定义的概念。也就是我国最早所说的”三遥系统（遥侧，遥信，遥控）“。最初的系统是晶体管的。现代的SCADA系统则都是计算机化的。用DCS或PLC也可以组成具有SCADA功能的系统。
DCS的基本结构和PLC的区别
现货，现货，降降降，火火火，火火火……
现货，现货，降降降，火火火，火火火……
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