此源代码,是一个用EDA设计的的交通灯。十字入口分主干道与支干道 -This source code is an EDA design of traffic lights. Cross the entrance points of the main road and branch roads

西门子PLC的编程应用，一个简单的十字交通灯控制的程序-Siemens PLC programming applications, a simple cross traffic light control program