DCS is a kind of”distributed control system”,which includes on-site controller,operator station computer,engineer station computer,and the network system that connects them in hardware;DCS software is an overall solution,which solves all the technologies of a system The problem is that the various parts of the system are closely integrated.
PLC is a device,which is equivalent to the field controller in DCS in hardware;it is a local scheme in software,and the organization between stations is loose.
DCS是一种“分散式控制系统”，硬件上包括现场控制器、操作员站计算机、工程师站计算机，以及联系他们的网络系统；DCS软件上是一个整体方案，解决的是一个系统的所有技术问题，系统各部分之间结合严密。
PLC是一个装置，硬件上等同于DCS中的现场控制器；软件上是一个局部方案，站与站之间组织松散。
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