Web based control of pressure loop apparatusPresentation Transcript
Web-Based Control of Pressure Loop Apparatus using LabVIEW Osama Azim (BE/1499/06) Information Technology, VII sem Under: S.S.Tripathi (Department of ECE)
Model Based Design for Process Control Systems
MBD for Web-based Control using LabVIEW
Control System Design (Pressure Loop Control)
Web-Based Control Design (Virtual Laboratory System)
Pressure Loop Control Chamber Compressed Air
Control System Design Closed Loop Feedback System Pressure Loop Control
P, PI and PID Control
Proportional Response: Difference between the set point and the process variable . Increasing the proportional gain (K c ) will increase the speed of the control system response.
Integral Response: Sums the error term over time. Effect is to drive the Steady-State error to zero.
Derivative Response: Causes the output to decrease if the process variable is increasing rapidly. Increasing the derivative time (T d ) parameter will cause the control system to react more strongly to changes in the error term and will increase the speed of the overall control system response.
PID Control for Pressure Loop
error_term = setpoint- process_value
p_term = kp * error_term
d_term = kd * (error_term - prev_error_term)
prev_error_term = error_term
i_state = i_state + error_term
i_term = ki * i_state
output = p_term + i_term + d_term
PID closed loop system response
Virtual Laboratory Design DAQ
LabVIEW G-Web Server
G Web Server is a HTTP/1.0 compatible web server used to run applications on the web
Its a stand alone VI
Load and Run CGI VI
Work with CGI applications to create documents whose content frequently changes and to process queries and form requests.
Integrate with other Computers
Work on different Platforms (LabVIEW Compatible Platforms)
Implement Security; L imit access by directory or by VI name, Control access by the client address, the referring document, or through group and password files.
G-Web Server Test
G-Web Server with an Application
Web Based Control in Industry Network (An Overview)
What do we use it for ?
Towards Virtual Laboratories:
Distance Learning for B.I.T. Extension Centers and B.I.T Mesra
- Web based control in Medium/Small Scale Industry
- Web based Supervisory Control and Data Acquisition (SCADA) using LabVIEW