设计PLC控制系统时的I/O点节省方法

The Solution of saving I/O points in PLC Control System Designing

本文介绍通过改进接线和程序设计相结合的方法，解决PLC系统设计时常出现的PLC I/O点不足的问题，其方法实用有效。

The problem about the limited numbers of input or output is encountered frequently in the design of PLC control system. Some schemes to solve the limited numbers of input or combination of the improvement of connecting wire and programming are given in this paper.