1、 毕 业 设 计毕 业 设 计 自动售货机自动售货机( (饮水机饮水机) )的的 PLCPLC 系统设计系统设计 班 级： 10-20 班 专 业： 机电一体化 姓 名： XXXXXXX 学 号： 20100657 指导教师： XXXXXXX 2013 年 10 月 摘 要 本论文设计的是基于西门子 S7-200 系列 PLC 构成的自动售货机控制系统，本文阐述了自动售货机的 来源与发展，以及它在国内外发展的现状，对自动售货机的方案进行了论证，介绍了 PLC 的基本组成、特 点以及工作原理，对基于西门子 S7-200 系列 PLC 构成的自动售货机系统整体设计过程进行较为细致的论 述。 文中详
2、尽地介绍了自动售货机的各硬件组成，并完成了 PLC 外部接线图。在 PLC 梯形图的编写时，文 中采用的是西门子 PLC 梯形图专用编译软件 STEP7 来进行编写。介绍了自动售货机的基本原理以及工作流 程去帮助大家理解，然后把程序分为几个程序块，分别对程序块进行编程。具体说明了可编逻辑控制器在 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。 关键词: : PLC；梯形图；I/O 点的分配；自动售货机 AbstractAbstract This graduation design is base
3、d on Siemens S7-200 series PLC constitute a vending machine control system. The design describes the vending machine source and development, and its development both at home and abroad and the present condition of the vending machine scheme are discussed. The PLC basic composition, characteristics a
4、nd working principle be introduced. Detailed discussion is based on Siemens S7-200 series PLC constitute a vending machine system overall design process. It is a detailed description of the vending machine of the hardware composition and completed PLC exterior wiring diagram in this graduation desig
5、n. During the writing of the PLC ladder diagram, this paper uses is Siemens PLC ladder diagram special compile software STEP7.This article introduces the basic principle of the vending machine and the working process to help you depth of understanding, and then the program is divided into several bl
6、ocks, to block respectively for programming. The programmable logic controller is specified in the role of the vending machine. Program involving vending machine work most of the process. Using PLC automatic vending machine improves the systems stability, which ensures the vending machine can have a long-term stable operation. KeywordsKeywords: : PLC: Ladder diagram; The I/O point distribution; vending machine 目目 录录 摘摘 要要 .2 绪绪 论论4 1.1自动售货机的理论背景与实际意义. 4 1.2 自动售货机设计的主要内
