基于PLC与组态王的花卉大棚温湿度监控系统设计

Design of Temperature and Humidity Monitoring System for Flower Greenhouse Based on PLC and Kingview

针对目前国内以PLC为核心的花卉大棚温湿度监控系统无法将实时自适应调节与无距离限制的无线通信监控相结合的问题,设计了基于PLC控制器的监控系统,能够进行实时温湿度自适应调节,同时完成无距离限制的无线通信监控。设计了系统组成框图,介绍了系统工作过程及模式,根据设计要求对硬件进行了选型,根据控制量对PLC的I/O地址进行了分配,根据工作模式进行了梯形图程序设计,根据控制对象进行了组态界面设计,根据MODBUS RTU协议通过4G DTU无线通信模块和COMWAY服务器实现远程通信。分别在实验室与大棚2种环境下进行了试验,实验室环境相对简单稳定,系统响应更迅速,大棚环境相对复杂,系统响应相对缓慢,但都处于可控范围内。结果表明,温湿度监控系统在保证传感器精度和可靠性的前提下,能够完成温湿度检测显示、温湿度自适应调节和无距离限制的远程监控3种主要功能且正确运行,在不同环境下均可达到预期目标。

Aiming at the problem that the domestic temperature and humidity monitoring system based on PLC can not combine the real-time self-adaptive adjustment with the wireless communication monitoring without distance limitation,a monitoring system based on PLC controller is designed,which can carry out the real-time self-adaptive adjustment of temperature and humidity and complete the wireless communication monitoring without distance limitation at the same time.We designed the system composition block diagram,introduced the system working process and mode,according to the design requirements selected the hardwares,according to the control quantity allocated the I/O address of the PLC,according to the working mode designed the ladder diagram program,according to the control object designed configuration interface,according to MODBUS RTU protocol,by 4G DTU wireless communication module and COMWAY server realized remote communication.The experiment was conducted in two environments of laboratory and greenhouse.The laboratory environment was relatively simple and stable,and the system response was faster;the greenhouse environment was relatively complex,and the system response was relatively slow,but in the controllable range.The results showed that the temperature and humidity monitoring system under the premise of ensuring the accuracy and reliability of the sensor,could perform the three main functions of temperature and humidity detection and display,temperature and humidity adaptive adjustment and remote monitoring without distance limitation and run correctly,and could achieve the expected goal in different environments.