编号
淮安信息职业技术学院
毕业论文
基于PLC的自动装卸料系统的题 目 设计
学生姓名 学 号 院 系 专 业 班 级 指导教师 顾问教师
电气工程系 电气自动化
二〇一四年六月
摘要
摘要
自动售货机在中国有着广阔的发展前景，文中介绍了自动售货机的发展历史和现状。在这次毕业设计中，我查阅了大量资料，以PLC原理为基础设计了自动售货机系统。按照自动售货机的工作方式，把一次交易过程分为：运行初期清零过程、投币过程、价格比较过程、选择商品过程、退币过程。利用梯形图编制各个过程的程序，完成了设计的基本要求
本论文是基于西门子S7-200 系列PLC进行自动饮料售货机控制系统的设计的。本文介绍了PLC的硬件基本组成，特点以及工作原理。阐述了自动饮料售货机的来源，发展及系统设计的基本原理及工作流程。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4.0版本的STEP7来进行编写，并完成了PLC外部接线图。利用PLC控制的自动饮料售货机提高了系统的稳定性，且逻辑上保证无或者尽量减少漏洞，使自动售货机能够长期稳定运行，不需要经常有人维护。
关键词 ：自动饮料售货机 PLC 梯形图 西门子
1
abstract
ABSTRACT
Vending machines in China has a bright future, the paper introduces the history and development of vending machine status. During the graduation project, I reviewed a lot of information to design PLC based on the principle of automatic vending machine system. Vending machines work according to a transaction process is divided into: Run the initial clearing process, the process of coin, the price comparison process, the process of selection of goods, coin process. Ladder prepared using the procedure of each process to complete the design of the basic requirements.
The design of Automatic Beverage Vending Machine PLC Control System is based on Siemens S7-200 series. The paper introduces the basic structure of PLC, characteristics and work principle. In the PLC trapezoidal chart compilation, this paper adopts the Siemens PLC ladder special compiler software version 4 of the STEP7 to write, and completed the PLC external wiring diagram. To improve the stability of the system by using automatic beverage vending machine PLC control logic, and ensure no or little loopholes, the vending machine can have a long-term stable operation, not often need someone maintenance
Keywords: automatic beverage vending machine；PLC； ladder diagram ；Siemens
2