施耐德产品140AMM09000C Quantum

140AMM09000C Quantum

140AMM09000C

PLC一般用在小型自控场所，比如设备的控制或少量的模拟量的控制及连锁，而大型的应用一般都是DCS。当然，这个概念不准确，但很直观，习惯上我们把大于600点的系统成为DCS，小于这个规模叫做PLC。

我们来讨论一下彼此的相同（似）之处。

PLC已经具备了模拟量的控制功能，有的PLC系统模拟量处理能力甚至还相当强大，比如西门子S7-400、ABB的ControlLogix和施耐德的Quantum系统。而DCS也具备相当强劲的逻辑处理能力。

小型化的PLC将向更专业化的使用角度发展，比如功能更加有针对性、对应用的环境更有针对性等等。大型的PLC与DCS的界限逐步淡化，直至完全融合。

DCS将向FCS的方向继续发展。FCS的核心除了控制系统更加分散化以外，特别重要的是仪表。FCS在国外的应用已经发展到仪表级。控制系统需要处理的只是信号采集和提供人机界面以及逻辑控制，整个模拟量的控制分散到现场仪表，仪表与控制系统之间无需传统电缆连接，使用现场总线连接整个仪表系统。（目前国内有横河在中海壳牌石化项目中用到了FCS，仪表级采用的是智能化仪表例如：EJX等，具备先进的控制水准）

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