毕业设计--基于PLC的自动售货机监控系统设计.doc

毕业设计（论文）--基于PLC的自动售货机监控系统设计 Based on PLC automatic vending machine system design ABSTRACT The present paper design was by the microcomputer - PLC constitution automat supervisory system, this article elaborated automat and the development, as well as it in the domestic and foreign development present situation, the characteristic as well as the principle of work basically, to carried on a more careful elaboration by the microcomputer - PLC constitution vending machine system overall design process. Chooses PC machine in the design to take the host workstation on position machine, the lower position machine uses PLC to make the controller, three PLC controllers respectively be from the workstation 1, from the workstation 2, from the workstation 3, in the article exhaustively introduced the automat various hardware composition, and has completed the PLC exterior wiring diagram. In the article has manufactured on the position machine user management contact surface. The present paper key point places the PLC various hardware part the design and the introduction, the PLC trapezoidal chart Defers to in the overall design process “asks the question, the analysis question, solves the problem” the guiding ideology, has made the careful elaboration to the overall system design work. KEY WORDS: the vending machine, Programmable controller,Ladder diagram 目　录 前　言 1 第1章 自动售货机的介绍 2 1.1自动售货机概述 2 1.2自动售货机功能分析 3 1.3自动售货机前景分析 4 第2章 总体设计方案 6 2.1自动售货机系统需求 6 2.2系统硬件结构框图 7 2.3 总体方案设计 8 第3章 自动售货机硬件结构设计 10 3.1 硬件选择 10 电机的选择 10 货币处理装置 10 送出机构 11 按钮装置 11 显示装置 12 第4章 自动售货机控制系统设计 13 4.1 基于PLC的自动售货机控制系统 13 货机硬件系统的组成部分及工作流程 13 货过程的控制子系统简述 14 基于PLC的自动售货机控制 15 4.2 PLC控制系统设计编程要求及基本原则 16 PLC控制系统设计编程要求 16 PLC控制系统设计的基本原则 17 4.3 自动售货机PLC控制方案设计 18 4.4 PLC选型 18 PLC概述 18 I/O点估算 21 PLC选型 21 4.5程序设计 22 I/O地址设计 22 流程设计 23 PLC与现场器件的连接 24 投币程序设计 25 比较、选择、购买程序设计 28 退币程序设计 30 主程序设计 32 梯形图程序调试 34 结　论 35 谢 辞 36 参考文献 37 附 录 39 外文资料翻译 45 前　言 从自动售货机的发展趋势来看，它的出现是由于劳动密集型的产业构造向技术密集型社会转变的产物。大量生产、大