简化PLC输入/输出点的方法

Schemes to predigest the numbers of PLC input or output

在PLC应用过程中经常会出现输入、输出点不够用的情况。本文详细介绍了几种较实用的方法 ,在不增加硬件投资的情况下 ,有效解决输入、输出点不足的问题。

In the design of PLC control system , the problems about the limited numbers of input or output are encountered frequently . In this article , some of effective schemes to solve the problems without increasing hardware requirements were presented in detail.