摘 要从自动售货机的进展趋势来看，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、大量消费以及消费模式和销售环境的变化，要求出现新的流通渠道；而相对的超市、百货购物中心等新的流通渠道的产生，人工费用也不断上升；再加上场地的局限性以及购物的便利性等这些因素的制约，无人自动售货机作为一种必须的机器便应运而生了。从广义来讲投入硬币、纸币、信用卡等后便可以销售商品的机械，从供给的条件看，自动售货机可以充分补充人力资源的不足，适应消费环境和消费模式的变化，24 小时无人售货的系统可以更省力，运营时需要的资本少、面积小，有吸引人们购买好奇心的自身性能，可以很好地解决人工费用上升的问题等各项优点。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，初始状态，投币状态，购买状态，退币状态，然后分别对程序块进行编程。具体说明了可编程序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：自动售货机；可编程序控制器；梯形图AbstractVending machines from the development trend, it is due to the emergence of labor-intensive industries to technology-intensive structure of the product of social change. Mass production, mass consumption, as well as consumption patterns and marketing environment, require the emergence of new distribution channels; and relatively supermarket, department store shopping and other new distribution channels of production, labor costs are also rising; coupled with the limitations of space as well as the convenience of shopping and other factors, no vending machines as a must place the. Input from the broad terms of coins, banknotes, credit cards, it will make sales of goods such as machinery, from the conditions of supply, the vending machine can fully complement the lack of human resources to meet the consumption environment and consumption patterns change, no sale of a...
