Programmable logic control er(PLC)because of its compact structure,convenient use,strong adaptability,widely used in traffic lights control.Through the use of programmable logic control er(S7-200 PLC)to control the traffic light simulation work,described in detail the design method of PLC traffic lights control system.Mainly introduces the design requirements of PLC traffic lights control system,a list of input and output address specific,and gives the design of ladder diagram of the system.The PLC control system has achieved good results in the simulation to control the traffic lights control system,ful y meet the requirements.%可编程控制器（PLC）因其结构紧凑，使用方便，具有很强的适应性等优点，在交通灯控制领域应用广泛。通过用可编程控制器（S7-200 PLC）控制交通灯模拟工作，详细叙述了交通灯的PLC控制系统的设计方法。主要介绍了交通灯的PLC控制系统的设计要求，列出了具体的输入输出地址，并给出了系统梯形图的设计。该PLC控制系统在对交通灯的模拟控制中取得了良好的效果，完全满足本系统提出的控制要求。
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