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摘要
本文介绍了国内交通灯的发展现状，以及存在问题，同时介绍了可编程控制器的工作原理，选型依据。设计了一种基于PLC的交通灯，详细介绍了所选用的西门子S7-200 PLC以及同类型的S7-300 S7-400PLC，根据设计要求对PLC的输入输出I/O进行了分配，并且编写系统运行的梯形图。
关键词：交通灯，PLC，车辆检测
Abstract
This article introduced the domestic traffic light's development present situation, as well as the existence question, simultaneously introduced the programmable controller's principle of work, the shaping basis. Has designed one kind based on the PLC traffic light, introduced in detail selects Simens S7-200 PLC as well as same type's S7-300 S7-400PLC, output I/O according to the design requirements to the PLC input to carry on the assignment, and compiled the systems operation the trapezoidal chart.
key word: The traffic light, PLC, the vehicles examine