可编程控制器输入输出点合理运用的探讨

The Input and Output Points of the Programmable Logical Controller

对可编程序控制器的输入、输出点的合理利用作了探讨,提出不需带扩展块,只要利用BCD 代码及译码器,即能实现I/O 点的一点多用;利用电压比较器取代了A/D 转换。另外还对利用T 形图软件控制PIC 的I/O 点作了探讨。

This article studies the rational use of the input and output points of the programmable logical controller.It proposes a new method to realize the multifunctions of one I/O point by using only BCD code and the decoder without the expansion unit.And in this new method,A/D converter is replaced by the voltage comparer.Moreover,this article also discusses using T shape figure software to control the I/O points in PLC.