西门子PLC的仓库温湿度控制设计
假设该粮库共有1个仓库，在每个仓库中要安装多个温湿度传感器，分布在该仓库的重要位置，每个温湿度传感器实际上是一个终端设备，也是该系统中的重要关键的设备。在每个设备中都有一个新型的温度传感器和湿度传感器，用于测量现场的温度和湿度，并将测量的温度湿度值，采用西门子A/D模块将温度和湿度的模拟信号转换成数字信号送PLC处理，以便控制整个粮库的各个测试点的温度湿度加以全面监视和控制管理。
对每个设备都要设置温度湿度监控的上限和下限值。当温度超过上限值时，说明该点的温度超过标准温度，则需要该系统直接启动本仓库中的空调设备降温，真正做到实时控制，同时也要向报警系统发送超温信号；当温度降到标准值时，则停止降温；如果温度低于下限值时，则要直接启动空调设备加热，并向报警系统报告，而当温度上升到标准值时停止加热。
毕业论文关键词：温度传感器 湿度传感器 PLC 控制
Warehouse temperature and humidity control design of Siemens PLC
Abstract
With the rapid development of China's science and technology and agriculture to improve the degree of automation, grain depot management will be further improved. General large grain depot, storehouse number more, measuring point can reach hundreds of. Granary temperature and humidity measurement method and the corresponding intelligent control is an important issue in food preservation.
Assuming that the grain depot has 1 warehouses, in each warehouse to install multiple temperature and humidity sensors, distributed in the important position of the warehouse, each temperature and humidity sensor is actually a terminal equipment, is the key equipment in the system. There is a new type of temperature sensor and the humidity sensor in each device, used to measure the temperature and humidity, temperature and humidity and the measured value, the Siemens A/D module converts analog signal into digital temperature and humidity signal sent to PLC treatment, the temperature and humidity in order to control the test point of each whole grain. Comprehensive monitoring and control management.
To set the upper limit temperature humidity monitoring values for each device. When the temperature exceeds the limit value, the point temperature exceeds the standard temperature, the need for the system directly start the air-conditioning equipment in the warehouse temperature, truly real-time control, but also to the alarm system sends over temperature signal; when the temperature drops to the standard value, then stop the temperature reduction; if the temperature is lower than the lower limit when to start the air conditioning equipment, heating, and report to the alarm system, and when the temperature rises to the standard value when the heating is stopped.
Key Words：Temperature sensor Humidity sensor PLC Control
目 录
1 引言 6
1.1 温湿度控制系统的意义 6
1.2 温湿度控制系统背景 6
1.3 研究技术介绍 7
1.3.1 传感技术 7
1.3.2 PLC简介 7
1.3.3 上位机 8
1.3.4 组态软件 8
2 硬件设计 9
2.1 硬件配置 9
2.1.1 西门子S7-200 CUP226 9
下一篇：轨道交通牵引电力监控系统设计