过程控制实验平台的设计与实现

针对我校过程控制实验场地、实验设备有限等问题,首先设计开发了一套过程控制实验平台。该实验平台下位机采用S7-300PLC控制器,对实验对象直接进行控制;上位机选择的是WinCC组态软件,通过与下位机通信,从而实现了对实验对象的控制、报警显示以及实时数据的显示和记录等功能。该实验平台的实验对象主要包括高位溢流水箱和夹套锅炉,能够实现液位、流量、温度和压力等参数的单回路、串级和反馈-前馈等控制。然后通过实验平台对锅炉液位进行控制,给出了相应的控制结果。研究结果表明,该实验平台为过程系统的网络化控制奠定了基础。

Design and Implementation of process control experimental platform

Aiming at the limited experimental site and equipments in our school,the experimental platform for process control was firstly designed.In this platform,S7-300 PLC controller was used as the slave computer,which directly controls the experimental facilities.While WinCC configuration software was chosen as the host computer.Through the communication between the host and salve computers,the following functions were achieved： control of the experimental facilities,alarm information display,real-time data display and record etc..The experimental facilities mainly include high level overflow water tanks and jacketed boilers,then,the single loop,cascade or feedback-feedforward control of the parameters,such as the level,rate of flow,temperature and pressure were realized.Using the experimental platform,the boiler level was controlled,and the experimental results were given.The results indicate that the experimental platform lays the foundation for the network control of process system.