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第四章可编程序控制器的使用4.1 怎样选择可编程序控制器就工程设计和选型来说,在选用可编程序控制器时,应当考虑以下几个方面的问题。一、首先要确定控制系统的规模可编程序控制器目前向两个方向发展;一是小型化,功能简单,结构紧凑,价格低廉,使用操作方便;另一是大型化,复杂化,高功能。大部分小型 PC 都是以单机自动化为目的而生产的,一般不具备通讯功
The fourth chapter the use of programmable logic controller 4.1 How to choose a programmable logic controller For engineering design and selection, the selection of programmable logic controller, you should consider the following aspects. First, we must first determine the size of the control system Programmable logic controller is currently developing in two directions: First, small, simple, compact, low cost, easy to use operation; the other is large, complex, high-performance . Most small PCs are produced for the purpose of stand-alone automation and typically do not have communication work