毕业设计（论文） 标 题 ： 基于 PLC 密码锁的系统设计 学生姓名： 宋理想 系 部： 电力工程系 专 业： 电气 自动化 班 级： 0 9 级自动化 02 班 指导老师： 王 全亮 郑州电力职业技术学院 第一章 绪论·············································51.1密码锁的优点······································5第二章 密码锁的硬件设计 ·······························62.1 S7—200的系统组成 ··························62.2 控制要求 ··································· 72.3 PLC的选型 ·································· 82.4 口分配表 ···································· 92.5 PLC外部接线图··································11第三章 密码锁的软件设计 ································123.1梯形图 ···········································183.2程序分析 ··········································193.3 程序设计的局限性和优点 ····························20结 论 ··················································21 致 辞 ···············································22【参考文献 】 ···············································23基于西门子 PLC 密码锁电气控制系统的讨论中文摘要 随着社会的不断进展，电子技术也获得了飞速的进展,在其推动下,现在电子产品几乎渗透了社会的各个领域,有力地推动了社会生产里的进展和社会信息化程度的提高,同时也使现代电子产品性能进一步提高,产品更新换代的节奏也越来越快。 在安全方面,以电子门锁防盗报警功能的逐渐取代了传统机械锁,克服了机械锁量少、安全性能密码质量较差,使无论在密码锁技...
