Tham khảo tài liệu 'data acquisition part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Microcontroller-based Data Acquisition Device for Process Control and Monitoring Applications 141 Fig. 15. Educational heating plant model with time-delay Model control application for Control Web Main window of the developed control application in Control Web 5 software environment is depicted in . The left part of the window contains simplified technology schematic with two control components for pump speed and demanded temperature setting. Pump speed can be set in the range from 0 to 100 where 0 means minimum allowable speed it can not be completely stopped due to possible heater damage . Demanded temperature range is limited to maximum of 85 centigrade. The right part of the window visualizes all monitored values - temperatures in 3 important parts of the model controller actuating signal and demanded temperature value. All these values are stored in graph with history of 1000 values. Model control application for Matlab All the tasks related to control and monitoring of the time delay model are served by control software with graphical user interface running in Matlab environment. The software supports step response measurement of the system control of the selected controlled variable using PS PSD and general linear controller with disturbance introduction possibility. To allow quick restoring of the time-delay model to initial conditions before next measurement cooling function was implemented. All measured data are automatically saved to the workspace in the matrix form and to the user definable text file with format suitable for import to spreadsheet processor. 142 Data Acquisition Fig. 16. Heating plant model control application for Control Web 5 After the program is executed by writing command hmodel in the command window of the Matlab environment the main window depicted in the will appear. The window is divided into two parts - upper part is dedicated to displaying all measured system variables in the form of auto-scale
