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摘要
本文介绍了国内银行排队叫号系统的发展现状，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的银行排队叫号系统，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：排队叫号，PLC，银行
Abstract
This article describes the number of domestic banks call queuing system development, and problems, also introduces the working principle of the programmable controller, selection basis. Designed based on PLC's bank line calling system, detailing the selected Siemens S7-200 PLC as well as the same type of S7-300 S7-400PLC, according to design requirements of the PLC's input and output I / O for the distribution of and the preparation of system operation ladder.
Keywords: queuing call number, PLC, Bank
