基于PLC的大棚温室控制系统的设计

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基于PLC的温室控制系统的设计

摘 要

随着人们生活水平的提高，由温室大棚种植的反季节蔬菜成为人们越来越离不开的食物，所以温室大棚技术越来越重要，而温度控制是最为重要的一环。考虑到PLC具有灵活性、操作简单等优点，所以设计出了基于PLC的温度控制系统。

该论文介绍了温室控制系统的构成，包括信息采集部分、智能控制部分以及最后的执行部分。由于温度的变化因素很多，包括光照、湿度、通风等因素，所以本次设计的系统中包括了升降温系统、补光系统、遮阳系统、加湿系统、CO2系统、通风系统，来综合调整温度的变化保证温度的准确度。根据设计需要和经济综合因素的考虑选用了西门子S7-200型PLC的控制，这样既能够满足输入与输出控制，又有比较高的性价比。在设计中给出了控制系统的软硬件设计，并用STEP7软件进行对梯形图的输入、调试与仿真，能够完全符合设计需求。

关键词 传感器 PLC 模糊控制器 MCGS组态软件 电机

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Greenhouse Control System Based on PLC

ABSTRACT

With the improvement of people's living standard anti season vegetables become people are increasingly inseparable from the food, so the greenhouse technology is more and more important, and the temperature control has become the most important part, so the PLC control system of greenhouse based on. Temperature sensor and PLC are the core of the greenhouse control system, they have a direct impact on the working status of the system. Its working process is the when the temperature sensor to collect the signal is transmitted to the fuzzy controller, the fuzzy controller by the signal conversion and comparative analysis, then the signal transformation output signal to the MCGS configuration software is used to judge the and the signal is transmitted to the PLC, PLC receives the signal and control motor working temperature control. MCGS configuration software where the computer is also a platform for human-computer interaction.

Key words Temperature Sensor PLC Fuzzy Controller

MCGS Configuration Software Electric Machinery

目录

第1章 绪论 .......................................................................................................................... 1

1.1 课题背景 ................................................................................................................... 1 1.2 国内外研究现状 ...................................................................................................... 1 1.3 内容安排 ................................................................................................................... 2

第2章 系统总设计方案 .................................................................................................... 3

2.1 系统总体设计思路 ................................................................................................. 3 2.2 设计概要图 ............................................................................................................... 3

第3章 系统硬件方案设计 ................................................................................................ 6

3.1 信息采集电路的设计 ............................................................................................. 6 3.1.1 温/湿度传感器的选择 .................................................................................. 6 3.1.2 光照传感器的选择 ........................................................................................ 7 3.1.3 CO2传感器的选择 ......................................................................................... 7 3.2 主控制电路设计 ...................................................................................................... 8 3.2.1 PLC的选择 ..................................................................................................... 8 3.2.2 PLC内部接线图 ............................................................................................ 9 3.2.3 模糊控制器设计原理 .................................................................................. 10 3.3 系统执行部分设计 ................................................................................................ 11 3.3.1 正反转部分设计 ........................................................................................... 11 3.3.2 开关类设计 ................................................................................................... 12 3.4 系统主电路图 ........................................................................................................ 13

第4章 系统软件方案设计 .............................................................................................. 15

4.1 STEP7 Micro/Win软件简介 ................................................................................ 15 4.2 STEP7-Micro/WIN编程软件主要功能 ............................................................. 15 4.3 STEP7-Micro/WIN编程方法 .............................................................................. 16 4.4 PLC系统软件介绍 ............................................................................................... 16

第5章 系统调试 ............................................................................................................... 23

5.1 仿真软件简介 ........................................................................................................ 23 5.2 控制程序的仿真与调试 ...................................................................................... 23 5.2.1 仿真与调试准备工作 .................................................................................. 23 5.2.2 程序仿真与调试 .......................................................................................... 23

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