1786-rpfm
dcs系统是封闭式系统，各公司产品基本不兼容。而fcs系统是开放式系统，不同厂商、不同品牌的各种产品基本能同时连入同一现场总线，达到最佳的系统集成。
dcs系统的信息全都是二进制或模拟信号形成的，必须通过d/a与a/d转换。而fcs系统将d/a与a/d转换在现场一次表完成，实现全数字化通信，使精度得到大的提高，可提高到0.1％。并且fcs系统可以将pid闭环控制功能装入现场设备中，缩短了控制周期，提高运算速度，从而改善调节性能。
dcs它可以控制和监视工艺全过程，对自身进行诊断、维护和组态。但是，由于自身的致命弱点，其i/o信号采用传统的模拟量信号，因此，它无法在dcs工程师站上对现场仪表（含变送器、执行器等）进行远方诊断、维护和组态。fcs采用全数字化技术，数字智能现场装置发送多变量信息，而不仅仅是单变量信息，并且还具备检测信息差错的功能。fcs采用的是双向数字通信现场总线信号制。因此，它可以对现场装置（含变送器、执行机构等）进行远方诊断、维护和组态。
fcs由于信息处理现场化，与dcs相比可以省去相当数量的隔离器、端子柜、i/o终端、i/o卡件、i/o文件及i/o柜，同时也节省了i/o装置及装置室的空间与占地面积。同时，fcs可以减少大量电缆与敷设电缆用的桥架等，同时也节省了设计、安 装和维护费用。
fcs相对于dcs组态简单，由于结构、性能标准化，便于安 装、运行、维护。
现在fcs系统被广泛的应用，那么，plc与dcs前景又将如何。
plc于20世纪60年代末期在美国首先出现，目的是用来取代继电器，执行逻辑、计时、计数等顺序控制功能，建立柔性程序控制系统
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