基于PLC的水塔水位控制系统设计.doc

毕业设计(论文)--基于PLC的水塔水位控制系统设计
四川理工学院毕业设计(论文)
基于PLC的水塔水位控制系统设计
学生:何沭达
学号:07021010104
专业:自动化
班级:
指导教师:张红光
四川理工学院自动化与电子信息学院
二O一一年六月
摘要
水位控制ABSTRACT
Based on PLC towers water level control system design
In the industrial and agricultural production process, often need to measure and control thewater level.?Water level control applications in everyday life are very wide, such as water towers, groundwater, hydropower and other water level control case.?But with the growing world population, it is the increase in water, relay towers used in the past, the water level automatic control system operation due to the frequent cause mechanical wear, convenient maintenance and updating can no longer meet the actual needs of the people, the paper used?Siemens PLC S7-200 programmable controller as a series of small water tower water level automatic control system core, the water level of the tower the functions of automatic control system of the requirement analysis.?Main achieved is through the actual water level sensor detects the water tower, specific information will be transmitted to the water level control module consisting of PLC, the A / D conversion, pare data, to control the pumping action of the motor, while data reduction, the indicated level?specific information, if the water level lower or higher than a set value, we will send the hazard warning signal.?In this paper, a water tank level control system design process, the water tower level control system based on PLC design a good implementation of the specific process.?
KEY WORDS: Water level control, Siemens S7-200, The sensor目录
摘要 I
ABSTRACT I
第1章引言 1
第2章可编程器简介 2
2
PLC的发展 4
PLC的基本结构 5
中央处理单元 CPU 5
存储器 6
输入/输出模块 7
扩展模块 8
编程器 8
PLC的基本工作原理 8
PLC的主要应用 9
S7-200系列PLC元件功能 10
第3章水塔水位控制系统方案设计 13
传统水塔水位控制 13
工作原理 13
外部接线与控制列表 13
辑及分析 15
PID水塔水位控制系统的工作原理 15
设计分析 15
可行性试验 16
可行性分析 17
水位闭环控制系统 17
第4章 PLC中PID控制器的实现 19
PID算法 19