文档介绍：基于PLC小型气象站设计
摘要
本论文着重介绍了以西门子公司生产的S7-200系列的PLC为主要控制元件,实现对外部环境的风速、大气压、温度和湿度进行实时监测和显示,以及当某项或多项空气指数超出设定的范围时系统会作出报警以警示人们当前环境对人某方面的危害;当这四种空气指数都符合舒适度的设定时,系统会输出显示为舒适。以上这些功能都是我们通过对PLC的编程实现的。
本设计采用多种传感器,包括温湿度传感器、风速传感器以及大气压力传感器。这些传感器具有反应速度快、测量精度高、耗能低、自身功能强大和价格低廉等优点。当外部传感器监测到外部环境所对应的空气指数后通过变送器将电阻电流信号转换成标准模拟信号输入到模拟量输入扩展模块,然后输入模块通过计算和处理这些数据传输到CPU中,并储存在内部寄存器中;最后系统通过以太网模块的传输将测得的温湿度、风速和大气压传到上位机得到显示,当数值超过限定范围时会做出相应的报警。本设计的小型气象站的测量精度非常高,实时性也比较高,所以完全可以应用到日常生活中去。
关键词:PLC,编程,传感器,显示
Based on PLC small station design
ABSTRACT
This paper introduces the Siemens S7-200 series PLC as the main ponents, realize the external environment of wind speed, atmospheric pressure, temperature and humidity for real-time monitoring and display, and when one or more of the air index was beyond the scope of setting the system will alarm to warn people about the dangers of the current environment of a certain aspect; When the four air index meet fort setting, system will display the output fort. These functions are based on PLC programming .
This design USES a variety of sensors, including temperature and humidity, wind speed sensor, and the atmospheric pressure sensor. These sensors have reaction speed, high precision, low consumption, and its powerful functions and the price is low wait for an advantage. When an external sensors to detect the external environment of the air index after through the transmitter converts resistance current signal into standard extension module analog signal input to the analog input, and then input module through calculation and processing these data to the CPU, and stored in the internal register. Finally system through module of transmission of the measured temperature and humidity, wind speed and atmospheric pressure is displayed to the upper machine, makes the corresponding alarm when numerical exceeds the limits. The design of small stations has high measurement precision, and has a high real time capability, so it can be applied to daily life.
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