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摘要
本文介绍了国内循环彩灯的发展现状，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的循环彩灯，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：循环彩灯，PLC，LED
Abstract
This paper introduces the development of the domestic cycle status lights, and the problems of programmable controller also introduced the working principle of selection basis. Designed based on PLC's cycle lights, detailing the use of Siemens S7-200 PLC as well as the same type of S7-300 S7-400PLC, according to the design requirements of the PLC's input and output I / O for the distribution, and preparation of The ladder system is running.
Key words: cycle lights, PLC, LED
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