1794-TB3S

1794-TB3S

1794-TB3S

1794-TB3S

　3. 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，是做不出协调控制的功能。
　　4. 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。
　　5. DCS安全性：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所搭接的系统基本没有冗余的概念，就更谈不上冗余控制策略。特别是当其某个PLC单元发生故障时，不得不将整个系统停下来，才能进行更换维护并需重新编程。所以DCS系统要比其安全可靠性上高一个等级。

备货，备货，降降降，火火火，火火火……
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