施耐德Quantum140CPU140CPU11303
施耐德Quantum140CPU140CPU11303
施耐德Quantum140CPU140CPU11303
DCS和PLC 之间有什么不同？
1、从功能来说：
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，比如横河FA-MA3、西门子的S7 400、ABB 的Control Logix 和施耐德的Quantum系统。而DCS也具备相当强劲的逻辑处理能力，比如我们在CS3000上实现了一切我们可能使用的工艺联锁和设备的联动启停。
2、从系统结构来说:
PLC与DCS的基本结构是一样的。PLC发展到今天，已经全面移植到计算机系统控制上了，传统的编程器早就被淘汰。小型应用的PLC一般使用触摸屏，大规模应用的PLC全面使用计算机系统。和DCS一样，控制器与IO站使用现场总线（一般都是基于RS485或RS232异步串口通讯协议的总线方式），控制器与计算机之间如果没有扩展的要求，也就是说只使用一台计算机的情况下，也会使用这个总线通讯。但如果有不止一台的计算机使用，系统结构就会和DCS一样，上位机平台使用以太网结构。这是PLC大型化后和DCS概念模糊的原因之一。
3、PLC和DCS的发展方向:
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的界线逐步淡化，直至完全融和。
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，具备世界最先进的控制水准)。
只要关系到自动化，您的任何要求都是特别的。我们的解决方案也一样。我们聆听您的要求，利用我们的资源制定出高性价比、着眼于结果的解决方案。我们的解决方案可能只是一个功能强大的组件，也可能是一个信息或资产管理解决方案，或者还可能是一个整个企业范围的集成系统。无论您的自动化要求是什么，您都会在与我们的合作中找到满意的答案。
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