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简要介绍了交通信号机的功能及利用ＰＬＣ实现的方法，解决了长期以来交通信号机存在的可靠性差的问题，同时实现了交通信号机的智能化。使用结果表明，信号机系统功能完善，性能稳定、可靠
Briefly introduces the function of traffic signal and the method of using PLC to solve the problem of poor reliability of traffic signal for a long time and realize the intelligence of traffic signal at the same time. The results show that the signal system has perfect functions, stable and reliable performance