自动售货机--李震.doc

大庆师范学院 plc课程设计报告 设计课题: 气体报警器的制作 姓 名: 李震，杨建国，王伟 学 院: 物 电 学 院 专 业: 电子信息工程 班 级: 08级 电子二班 日 期： 2010年 12月 指导教师： 王风嫔 目 录 1.绪论· ······················································3 1.1研究的目的及意义·········································3 1.2设计的任务与要求·········································3 2.设计方案 ·················································3 2.1方案（一）················································3 2.2方案（二）················································4 2.3总体设计思路············································· 3. 自动售货机设计软元件·································· 3.1 定时器············································ 3.2 数学运算指令········································ 4.硬件设计····················································5 4.1 I/O地址分配·············································5 4.2 中间继电器的分配········································6 5.软件的设计 ·················································6 5.1整体系统工作流程·········································6 5.2梯形图···················································8 6.自动售货机的仿真 ········································11 7. 结论··········································13 8．参考文献·············································· 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，保证了自动售货机能够长期稳定的运行。 关键词 自动售货机 可编程控制器 I/O点的分配 梯形图 1. 绪论 1.1研究的目的及意义 PLC的发展与计算机技术，半导体技术，控制技术，数字技术，通信网络技术等高新技术的发展息息相关，这些高新技术的这些高新技术的发展推动了PLC的发展，而PLC得发展又对这些高新技术提出了更高更新的要求，促进了他们的发展。本次设计就在于结合PLC的种种优点联系实际情况来弥补原有系统的不足，利用PLC控制的 自动售货机提高了系统的稳定性，保证了自动售货机长期稳定的运行。 1.2设计的任务与要求 1） 此自动售货机可投入1元、5元、10元硬币。 2） 当投入的硬币总值等于或超过12元时，汽水按钮指示灯亮；当投入的硬币总值超过15元时，汽水、咖啡按钮指示灯亮。 3） 当汽水按钮指示灯亮时，按汽水按钮，则汽水排出7s后自动停止。汽水排出时，相应指示灯闪烁。 4） 当咖啡按钮指示灯亮