1、 本科毕业设计说明书本科毕业设计说明书 PLCPLC 在自动售货机的应用在自动售货机的应用 THE APPLICATION OF THE VENDING MACHINE IN PLC 学院(部) :电气与信息工程学院 专业班级: 自动化 08-5 班 I PLC 在自动售货机的应用 摘要 本文介绍了自动售货机的基本原理以及工作流程,然后以一次交易过程为例,把 交易过程分为几个程序块,然后分别对程序块进行编程。具体说明了可编程控制器在自 动售货机中的作用。程序涉及到了自动售货机工作的绝大部分过程。利用 PLC 控制的 自动售货机提高了系统的稳定性,保证自动售货机能够长期稳定运行。 本论文设计的是
2、基于西门子 S7-200 系统 PLC 构成的自动售货机监控系统, 本文利 用 PLC 自动控制具有功能完备、灵活性、通用性好,程序输入方法简化,操作简单等 优点,设计出了 PLC 自动控制售货机,本文阐述了自动件货机的来源与发展,以及它 在国内外发展的现状,介绍了 PLC 的基本组成、特点以及工作原理,介绍了自动售货 机的基本原理以及工作流程。 本系统的设计和实现可以使自动售货机的经营者可以根据网络特级的销售状况进行 商品销售状况分析,预测商品的销售走势,确定合理的采购和配送策略,以期获得最高 的投资回报率。同时售货机的一些故障信息和报警信息可以适时的传送到相应的运营人 员,从而在第一时间内
3、发现并解决问题。 关键词:自动售货机,关键词:自动售货机,S7-200,PLC II THE APPLICATION OF THE VENDING MACHINE IN PLC ABSTRACT This article describes the basic principles and workflow of the vending machine, and then to process a transaction, for example, the transaction process is divided into a few block, and then block progr
4、amming. Specify the role of a programmable logic controller in the vending machine. Procedures related to the vending machine most of the work process. PLC control of the vending machine to improve the stability of the system, ensure that vending machine be able to long-term stable operation. Design
5、ed in this paper constitute a vending machine monitoring System based on Siemens S7-200 PLC using PLC automatic control with full-featured, flexible, common good, the program input method simplifies and easy operation, the design of PLC automatic control of vending machines, the paper describes the
6、origin and development of the automatic cargo aircraft, as well as its current situation, in the domestic and international development, introduces the PLC basic composition, characteristics and working principle, the basic principle and workflow of the automatic cargo plane . Design and implementation of this system allows the operators of the vending machine sales of goods according to the networks premium sales analysis, forecasting commodity sales trends, determine a reasonable procure