PLC课程设计报告，采用罗克韦尔专业PLC编程软件的T形图语言编写实现，能模拟路况，实现交通灯控制，倒计时，黄灯功能，另实现急行通车及全停-PLC program design report, using Rockwell PLC programming software professional T-shaped plan language to achieve, can simulate road conditions, to achieve traffic light control, c