abb cp502

abb cp502

abb ypk112a

plc控制和dcs控制系统不是一个逻辑层次上的概念,从名称上就能看出:plc是以功能命名,dcs是以体系结构命名。从原理上看plc就可以组成dcs。当然两者性能差异还是存在的,要具体看产品和需要。从应用角度来说,简单地以plc,dcs来区分,往往会走人误区。

dcs控制系统与plc控制区别:dcs是一种“分散式控制系统”,而plc(可编程控制器)只是一种控制“装置”,两者是“系统”与“装置”的区别。系统可以实现任何装置的功能与协调,plc装置只实现本单元所具备的功能。

dcs网络是整个系统的中枢神经,dcs系统通常采用的国际标准协议tcp/ip。它是安  全可靠双冗余的高速通讯网络,系统的拓展性与开放性更好.而plc因为基本上都为单个小系统工作,在与别的plc或上位机进行通讯时,所采用的网络形式基本都是单网结构,网络协议也经常与国际标准不符。在网络安  全上plc没有很好的保护措施。

dcs整体考虑方案,操作员站都具备工程师站功能,站与站之间在运行方案程序下装后是一种紧密联合的关系,任何站、任何功能、任何被控装置间都是相互连锁控制,协调控制;而单用plc互相连接构成的系统,其站与站(plc与plc)之间的联系则是一种松散连接方式,做不出协调控制的功能。

dcs在整个设计上就留有大量的可扩展性接口,外接系统或扩展系统都十分方便,plc所搭接的整个系统完成后,想随意的增加或减少操作员站都是很难实现的。

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