基于GPRS的PLC多点温度监控系统.docVIP

基于GPRS的PLC多点温度监控系统设计 摘 要 在我国北方地区主要采用集中供暖的方式，根据小区供暖对恒压恒温的控制要求，本设计采用计算机、工业智能模块、传感器和执行器组成一个温度和压力双重闭环的供暖控制系统。通过组态控制方法和PID控制策略，设计了组态界面监控程序，实现了对小区供暖系统温度、压力、流量参数的现场采集和实时调节，从而提高控制精度。在本设计了主要分为三个部分：上位机通用组态软件、GPRS无线传输、下位机S7-200 PLC。 在上位机部分采用的是MCGS通用组态软件，MCGS是数据采集与过程控制的专用软件，它以灵活多样的组态方式为用户提供良好的用户开发界面，具有丰富的画面显示组态功能。在组态界面上主要显示各小区换热站的网管温度、压力、流量等参数并对其进行控制，保证其安全可靠的运行。 该系统的数据传输网络主要是通过GPRS DTU和移动公司GPRS网络来完成的。DTU是数据接收和发送模块，在网络中主要完成下位机与上位机的数据传输的任务，同时也是与移动GPRS网络的工作接口。 下位机部分利用了西门子得S7-200 PLC对现场设备运行情况及参数进行采集和控制。 通过在实验室将程序进行调试，使其控制精度、运行可靠性基本符合了系统的控制要求。 关键词：S7-200 PLC GPRS PID MCGS组态软件 The Design of Multi-point Temperature Control System Based on GPRS and PLC Abstract In the northern China mainly uses the central heating way, according to the district control requirements of constant pressure and temperature. This design uses the computer, industrial intelligent module, sensors and actuators form a temperature and pressure double closed loop of heating control system. Through the configuration control method and PID control strategy, design the monitoring program of configuration interface, realizing the data acquisition and real-time adjustment of temperature, pressure, and flow rate parameters in the heating control system, so as to improve the control precision. This design can be divided into three parts, including the general configuration software of upper machine, GPRS wireless transmission, PLC S7-200. Use MCGS general configuration software as the upper part. MCGS is specialized software of data acquisition and process control. It has rich pictures showed function and flexible configuration mode, which provide good interface development for user. In the configuration interface mainly shows the temperature, pressure, flowing parameters of every heating transfer station and its control, ensure the safe and reliable operation. The data transmission network of system is mainly through the GPRS DTU and mobile company GPRS network. DTU is the sending and receivin