PLC步进计数器在交通信号灯控制系统中的应用

Application of PLC Step Counter in the Traffic Signal Lights Control System

通过一个十字路口交通信号灯控制的实际工程案例,讨论使用Twido PLC的赋值指令与步进计数器相结合使用的编程方案.该编程方案可以让使用者更加直观地进行程序的编写,因为步进计数器工作时每一时刻只有一个工作步是有效的,所以可以按照顺序步进的方法进行程序设计,使编程更容易维护、修改,使用更为方便.

Through an actual project case of traffic signal lights at an intersection,it is discussed the program project of combining assignment instruction with step counter by using Twido PLC.The program project will make the user write programs more visually,because only one step is effective.When step counter works every moment.Therefore,you can design program according to the step method,which will make the program maintain and modify easier and also will make the program use more conveniently.