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本文重点介绍在ＰＣ电梯控制系统中扩展Ｉ／Ｏ点的方法，给出了采用Ｃ系列ＰＣ机的硬件电路及部分梯形图，其中个别方法可用于其它控制系统中。
This article focuses on the method of extending I / O points in a PC elevator control system. The hardware circuits and some ladder diagrams of the C series PC are given. Some of the methods can be used in other control systems.