I基于 PLC 的自动售货机系统设计摘要本论文基于西门子 S7-200 系列 PLC 进行自动售货机控制系统的设计,阐述 了自动售货机系统设计的基本原理及工作流程,然后以一次交易过程为例,把交 易过程分为几个程序块,分别对程序块进行编程。在 PLC 梯形图的编写时,文中 采纳的是西门子 PLC 梯形图专用编译软件 STEP7 来进行编写,并完成了 PLC 外部 接线图。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 ;自动售货机;控制系统1、 格式存在错误,如段前段后间距、 字体大小等等2、 整个文章太简单,基本上没什么内容,能够适当填充3、 总结有错4、 参考文献有错The System Design for Automatic Vending Machine Based on PLCTutor: Guilin liuII AbstractProfessional Electrical automation No. 12713 Name :wei yuan The design of this paper is based on Siemens S7-200 series automatic vending machine PLC control system, explains the vending system design principle and workflow, and then to a course of dealing, for example, the transaction process is divided into several blocks on blocks, respectively. In the preparation of the PLC ladder diagram, the text is a Siemens PLC ladder diagram private compile software to write the STEP7, and completed a PLC external wiring diagram. Use of PLC control vending machine improves the stability of the system, ensure the long-term stability of the vending machine to run.Keywords :PLC ; vending system;(格式有错 目 录I第 1 章 引言 ................................................................ 3 1.1 自动售货机的进展 ....................................................... 3 1.2 自动售货机控制系统设计的主要内容 . ...................................... 3 第 2 章 可编程控制器 PLC ................................................. 4 2.1 PLC 的进展 ............................................................. 4 2.2 PLC 的选型原则及选型方法 „„„„„„„„„„„„„„„„„„„„„„...
