基于PLC的次品筛选系统设计.doc

分类号： U D C：D10621-408-(201) 1394-0 密 级：公 开 编 号：2010071008 基于PLC的次品筛选 论文作者姓名： 申请学位专业： 测控技术与仪器 申请学位类别： 工学学士 指导教师姓名（职称）： 论文提交日期： 2014年05月日 分类号： U D C：D10621-408-(201) 1394-0 密 级：公 开 编 号：2010071008 成都信息工程学院 学位论文 基于PLC的次品筛选 论文作者姓名： 申请学位专业： 测控技术与仪器 申请学位类别： 工学学士 指导教师姓名（职称）： 论文提交日期： 2014年05月日 基于PLC的次品筛选 摘 要 关键词：PLC；次品；检测；金属；重量； 控 Design on Screening Defective System Based on PLC Abstract In the food processing industry, there are always small metal particles, which can not be seen by the naked-eye, doped mixed in the food. It makes the quality of the food seriously affected, sometimes also damages the interest of business and consumers. As we known, a person who had mistaken the metal particles in the food may cause damage to the esophagus. In addition, all food manufacturers look forward that the consistent of the food value can reach the expected standards, which will not damage the reputation of manufacturers because of the shortage of weight, nor cause lose for paying more weight. The main purpose of this project is under the control of the PLC to monitor that if there is some items contained in the food, or whether the weight is qualified or not. Through the effective detection, we can find out there is iron or something failure inside the bag, then alarm and submit the product out of the main production line by pushing. In this way we can push the defective them out of the main production line, and can dynamically calculate and display the defective rate. This subject has a certain practicality, and has a certain reference value to improve food inspection systems. Key words: PLC; defectives; detect; metal; weight; control 目录 论文总页数：2页 1 引言 1 1.1 课题背景及意义 1 1.2 国内外研究现状 1 1.3 课题内容 3 2 设计方案的选择 3 2.1 主要功能 3 2.2 技术指标 3 2.3 方案比较论证与确定 4 2.3.1 供选方案 4 2.3.2 方案的比较与确定 4 3 主要功能设计 5 3.1 硬件设计 5 3.1.1 主要器件的介绍 5 3.1.2 系统实物图 10 3.2 软件设计 12 3.2.1 系统流程框图 12 3.2.2 主程序的编写模块 13 3.2.3 系统主程序 14 4 系统调试 15 5 系统试验及