摘要：本人的毕业论文主要是讲述基于西门子S7-1200的V13系列可编程控制器（PLC）为主要的控制元件，实现对空气压缩机的温度、湿度的调节控制，并同时实现对空气压缩机过流，欠压，过压，过热等的保护以及其转速进行变频调速的功能。70612

课题的设计是先通过温湿度传感器对环境进行监测，将监测值反馈给A/D转换器，A/D转换器则将输入的电信号转换为输出的数字信号输入PLC S7-1200中，PLC通过内部程序给D/A转换器数字量，通过USS协议来实现与MM440变频器通信，利用变频器调节空气压缩机的转速实现对环境温湿度的调节。

毕业论文关键词：PLC S7-1200；温湿度调节控制；变频调速

Design of PLC for Temperature and Humidity Controller

Abstract: My thesis is mainly about the Siemens S7-1200 based on the V13 series programmable logic controller (PLC) as the main control components to achieve the air compressor temperature and humidity control, and at the same time to achieve the air compressor overcurrent , Undervoltage, overvoltage, overheating and other protection and speed of the frequency control function.

The design of the project is to monitor the environment through the temperature and humidity sensor, the feedback value back to the A / D converter, A / D converter will enter the electrical signal into the output of the digital signal input PLC S7-1200, PLC Through the internal program to the D / A converter digital, through the USS protocol to achieve communication with the MM440 inverter, the use of frequency converter to adjust the air compressor speed to achieve the adjustment of environmental temperature and humidity.

Keywords: PLCS7-1200; Temperature and humidity control;Frequency control of motor speed

目录

摘要 i

Abstract ii

目录 iii

1.绪论 1

1.1课题的背景和意义 1

2课题简介及方案 2

2.1国内外研究水平 2

2.1.1国外研究现状: 2

2.1.2国内研究现状: 2

2.2课题研究设计要求 3

2.3 课题设计方案 3

3.PLC S7-1200介绍 5

3.1  S7-1200组成结构 5

3.2  S7-1200工作原理与特点 5

3.2.1 S7-1200工作原理 5

3.2.2　S7-1200特点 6

3.3  S7-1200应用领域及发展方向 7

3.3.1 S7-1200应用领域 7

3.3.2 S7-1200发展方向 7

4.课题的硬件设计和方案 8

4.1  温湿度传感器 8

4.1.1温度传感器原理 8

4.1.2湿度传感器原理 8

4.1.3传感器选择 9

4.2  A/D转换器和D/A转换器 9

4.2.1 A/D转换器 9

4.2.2 D/A转换器 10

4.3  PLC S7-1200编程软件 11

4.4  MM440变频器