蔬菜大棚温湿度自动监控系统的设计(兰州理工翻译).doc

LANZHOU UNIVERSITY OF TECHNOLOGY 毕业设计 题 目 蔬菜大棚温湿度控制系统的PLC程序设计 学生姓名 学 号 专业班级 指导教师 学 院 电信学院 答辩日期 2012年6月12日 摘 要 温室对现在的人们来说熟悉的名词如何利用自动检测与控制系统有效的控制好温室大棚内的环境因子，以提高温室大棚环境的控制精度和效果，对我国温室业的发展有着不可估量的重要意义Abstract Greenhouse for the people now is a very familiar noun, because now we live in a lot of flowers, vegetables, fruit which from greenhouse shelter of planting out. How to use automatic detection and automatic control system of effective control of greenhouse trellis inside, in order to improve the environmental factor trellis environment control precision of the greenhouse effect and has become the greenhouse industry research in China at present. This design USES the Siemens s7-300 PLC to realize the automation control greenhouse trellis. Temperature, humidity environment factors in the process of plants plays an important role in detecting the environmental factor, when considering the accuracy, the reaction speed, convenient device connected by such issues, will the temperature sensor,humidity sensors detect the indicators of environment, the sensor will test results by PLC sent PLC compare it with setting, then sends out the corresponding order-driven heating element,, the fan, ventilation window, filling light equipment, sunshade shade equipment operation or stop to adjust indoor temperature, light, humidity, so as to achieve the purpose of intelligent, automation control. Discuss PLC control system application in plants greenhouse canopy, Use the step7 and wincc flexible to achieve the upper and lower sandhi detailed introduces the characteristics of the system, the composition, the hardware design and software design. Keywords: Vegetables greenhouse；PLC system；Temperature and humidity control摘 要 I Abstract II 第一章 绪 论 1 1.1 课题背景及研究意义 1 1.2国内外温室控制技术发展概况 2 1.3 选题的目的和意义 3 第二章 系统的整体设计方案 4 2.1系统的设计任务 4 2.2 控制系统核心部件的选择 4 2.2.1 通讯方式简介 4 2.2.2 温室控制系统硬件配置 5 2.3．控制方案 6 2.4.系统工作原理 7 第三章 硬件系统的研究与设计 8 3.1