基于PLC控制的城市污水处理系统设计-毕业论文.doc

目 录 摘要 1 关键词 1 Abstract 1 Key Words 1 引言 2 1 设计污水处理系统的缘由 2 1.1 设计的目的和意义 2 1.2 课题的背景 2 1.3 污水处理的国内外现状 2 1.4 课题主要设计的内容 3 2 城市污水处理控制系统总体介绍 3 2.1 污水处理概述 3 2.2 常用的工业污水处理工艺 3 2.3工业污水处理系统控制形式 5 2.4 工业污水处理系统的功能要求 6 2.4.1信号输入 6 2.4.2控制输出信号 7 3 设计方案的确定 7 3.1 PLC控制系统的设计分析 7 3.1.1 PLC的结构 7 3.1.2 PLC的工作原理 8 3.1.3 PLC控制系统设计原则的设计步骤 8 3.2 污水处理PLC控制系统的设计分析 10 3.2.1 污水处理的过程 10 3.2.2 上位监控管理机 11 4 硬件部分的设计 11 4.1 PLC的选择 11 4.2　SBR污水处理系统设备 11 4.3 污水处理控制流程 12 4.4I/O分配表 13 5 软件部分的设计 13 5.1 程序的流程图 13 5.2 梯形图程序 15 5.2.1　污水处理系统各主要工作指令分析和设计 15 5.2.2　根据控制要求、I/O分配表，设计PLC梯形图 16 5.2.3　调试过程 16 总结 17 参 考 文 献 18 附录A 污水处理系统梯形图程序 19 致 谢 24 基于PLC控制的城市污水处理系统设计 机械电子专业学生 XXX 指导教师 XXX 摘要PLC based control of the city sewage treatment system design Machinery and electronics professional student XXX Tutor XXX Abstract: In recent years, the city sewage treatment plant has become one of the most important infrastructure. Especially small and medium city, new or expanded sewage treatment plant has become a local government to improve the lives of the people level priority. Along with the automation technology, computer technology continues to develop, improve, sewage treatment plant automation level also improved. While the PLC controller with its technology is mature, good commonality, high reliability, flexible installation, easy expansion, high ratio of performance to cost a series of advantages, in the industrial control has been more and more widely applied. This paper introduces the automatic control system in sewage treatment plant composition, function and how to use PLC to realize the automatic control, and introduces the system encountered in the implementation of the problems and the solving measures. In the sewage treatment in the PLC control system after modification, improves the reliability of automatic control, not only reduces the work .The labor intensity, but also improve the sewage treatment plant operation efficiency and operation efficiency, realize the scientific management of sewag