A61L-0001-0093*现货

发布时间:2023-05-18
A61L-0001-0093;
供应A61L-0001-0093;
A61L-0001-0093;


(1)DCS系统是个大系统,其控制器功能强而且在系统中的作用十分重要,数据公路更是系统的关键,所以,必须整体投资一步到位,事后的扩容难度较大。而FCS功能下放较,信息处理现场化,数字智能现场装置的广泛采用,使得控制器功能与重要性相对减弱。因此,FCS系统投资起点低,可以边用、边扩、边投运。
  (2)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,用户可以选择不同厂商、不同的各种设备连入现场总线,达到的系统集成。
  (3)DCS系统的信息全都是二进制或模拟信号形成的,必须有D/A与A/D转换。而FCS系统是全数字化,就免去了D/A与A/D变换,高集成化高性能,使精度可以从±0.5%提高到±0.1%。
  (4)FCS系统可以将PID闭环控制功能装入变送器或执行器中,缩短了控制周期,目前可以从DCS的每秒2--5次,提高到FCS的每秒10--20次,从而改善调节性能。
  (5)DCS系统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,由于自身的致病弱点,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系统采用全数字化技术,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系统采用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)进行诊断、维护和组态。FCS系统的这点优越性是DCS系统无法比拟的。
  (6)FCS系统由于信息处理现场化,与DCS系统相比,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,有*认为可以省去60%。


A61L-0001-0093*现货

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