IC641VPP950;
供应IC641VPP950;
IC641VPP950;
PLC控制和DCS控制系统不是一个逻辑层次上的概念。
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。
DCS控制系统与PLC控制系统区别：
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，网络协议也经常与标准不符。
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。
为保证DCS控制的设备的安全可靠,DCS采用了双冗余的控制单元，当重要控制单元出现故障时，都会有相关的冗余单元实时无扰的切换为工作单元，保证整个系统的安全可靠。PLC所搭接的系统则需要配置双 PLC实现冗余。
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