基于PLC和人机界面的水质自动监测仪研究

针对目前市场水质监测仪缺少相应配套操作界面和上位机软件的问题,研究了一种集自动控制、手动控制、人机界面于一体的水质自动监测仪,实现对池塘中溶氧、pH、电导率等参数的实时监测和控制。监测仪以GX Works2和Dopsoft(版本号1.01.08)两款软件平台基础上开发,传感器选用CLEAN公司的5000系列,以FX1S系列PLC作为核心控制器,DOP-B07S411触摸屏作为人机界面,并结合RS485、RS422总线技术实现数据的采集和人机界面的通信,控制增氧机、电磁阀以及报警灯等设备。研究在宁海养殖池塘获得实际应用,结果表明,溶氧范围控制在6 mg/L以上,达到对虾生长的最佳适宜条件。研究的应用,极大地方便了人员对池塘的水质管理,且成本低廉,具有一定市场推广价值。

Monitoring Instrument for Water Quality Based on PLC and HMI

In view of the present problems that water quality monitor market lacks the corresponding operation interface and PC software,a kind of automatic monitoring instrument for water quality is studied;it integrates automatic control,manual control and HMI.It can effectively achieve the real-time monitoring and control for the dissolved oxygen,pH,conductivity and other parameters in the pool. This study is developed based on the GX Works and the Dopsoft(version 1.01.08).That CLEAN 5000series as the sensor 、FX1S series PLC as the core controller and DOP-B07S411 touch screen as man-machine interface can flexibly control the aerator,solenoid valves,alarm lights and other equipment,the PLC collects the data by communicating with sensor using RS-485 ,the HMI can provide the data and manual control by communicating with PLC using RS-422.This design has a good application in a pond next to Ninghai,results show that the date of dissolved oxygen is controlled in 6mg/L or more and achieve the best growth conditions of the prawn.The application of this study which gives the researchers great convenience to manage the water quality has low cost and has the market value.