基于LabVIEW和PLC的Modbus RTU通信的RMR水下泵组监控系统设计

Design of RMR underwater pump monitoring system via Modbus RTU based on LabVIEW and PLC

摘要:

泵组是深海钻探中RMR的重要设备，通常安放在深水中，为了实现在船舶甲板操控房中便捷地掌握泵组运行情况及工作参数，本文设计了一套RMR水下泵组监控系统。该系统的硬件包含水下测控单元、脐带缆和甲板监控单元3部分，分别承担收集泵组工作参数与工作画面、为泵组供电与传输信息、显示和控制泵组工作参数等功能。使用光端机与脐带缆可实现信号远距离传输；水下测控单元采用两台相同规格的PLC，具有模块化设计的优点。该系统的上位机采用LabVIEW软件进行编程，具有操作简单，人机界面友好等优点；下位机采用Easybuilder软件对PLC进行编程，具有库函数强大、可读性好等优点。上位机与下位机通过标准Modbus RTU协议进行通讯。该系统进行软硬件联调测试，上位机能够正常读取、显示下位机外部设备的数据，控制下位机外部设备的开关、启停与通断，表明该系统能够很好地满足RMR水下泵组监控需求，同时该系统还具有可扩展性等优点。

Abstract:

The pump is an important equipment for RMR of deep-sea drilling， usually placed in deep water. In order to conveniently monitor the operation and working parameters of the pump in the ship deck control room， this paper designs an RMR underwater pump monitoring system. The hardware of the system includes three parts： underwater measurement and control unit， umbilical cable， and deck monitoring unit， which are responsible for collecting pump working parameters and working screens， supplying power and transmitting information to the pump， displaying and controlling pump working parameters. The use of optical transceivers and umbilical cables can achieve long-distance signal transmission. The underwater measurement and control unit adopts two PLCs of the same specifications， which have the advantage of modular design. The upper computer of the system is programmed using LabVIEW software， which has the advantages of simple operation and user-friendly interface. The lower PLCs is programmed using Easybuilder software， which has the advantages of powerful library functions and good readability. The upper computer and lower computer communicate through the standard Modbus RTU protocol. The system underwent software and hardware integration testing， and the upper computer was able to read and display data from external devices of the lower computer normally， control the on/off， start/stop of external devices， indicating that the system can well meet the monitoring requirements of RMR underwater pump. And the system also has advantage such as scalability.