Modbus-RTU在取水泵站监控系统中的应用

The application of Modbus-RTU in the monitor system of water pumping station

系统采用倍福PLC控制器对现场设备进行监控,并采用Modbus_RTU协议采集清污机、闸板门、旋转滤网、综保装置等设备的开关状态和工作电流,分别上传至操作员站和工程师站的上位机King SCADA系统,同时兼备Modbus通信失败报警功能。上位机接收到PLC采集的数据并显示到监控系统画面,同时还将重要的监控数据传至主厂区DCS系统。由于泵站与主厂区距离较远,光缆铺设成本大且难维护,故采用基于GPRS的DTU点对点设备并利用Modbus_RTU进行485通信。

This system adopts the PLC controller of Beckhoff to monitor the site equipment,and uses the Modbus_RTU protocol to collect the switch status and working current of the equipment,such as the removal machine,the sluice gate,the rotary sieve,and the composite protection device. They are uploaded to the upper computer King SCADA system of the operator station and the engineer station. At the same time,this system has Modbus communication failure alarm function. The upper computer receives the data from the PLC and displays the data on the screen of the monitoring system,and then sends the important monitoring data to DCS system of the primary area. Because the pumping station is far away from the primary area,the cost of cable laying is large and it's difficult to maintain,we adopt DTU point-to-point equipment based on GPRS and Modbus_RTU protocol to achieve 485 communication.