1 USING LabVIEW TO TEACH PROCESS CONTROL LABORATORY COURSES THROUGH THE INTERNET. VALENTÍN PÉREZ-HERRANZ Profesor Titular de Universidad. Depto. Ingeniería Química y Nuclear. Universidad Politécnica de Valencia. Camino de Vera S/N. 46071 VALENCIA. Category: Academic Products used: LabVIEW, DataSocket, DAQ board Lab PC+ The challenge: The number of students at Spanish universities is increasing constantly. However, economic resources do not grow proportionally, which results either in a decrease of laboratory practices, or in too numerous work teams. The solution: The use of new software applications and Internet communication tools, allows for several users to access complex or expensive instrument systems simultaneously. Hence, these tools can be used to solve the problems mentioned above.
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Using Labview to Teach Process Control Laboratory Courses Through the Internet.
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8/4/2019 Using Labview to Teach Process Control Laboratory Courses Through the Internet.
The applications have been developed using the program LabVIEW from
National Instruments. LabVIEW is a graphical programming language for building data
acquisition and instrumentation systems, and is ideally suited for the collection and
distribution of data for process monitoring and control applications. It facilitates fast
program development, provides many powerful built-in functions, and has universal
acceptance in research and manufacturing settings.
The remote connection between the server and the clients was done using
DataSocket. DataSocket is a new Internet programming technology that simplifies data
exchange between computers and applications. It has been designed for sharing and
publishing live data in measurement and automation applications over the Internet and
respond to multiple users without the complexity of low-level TCP programming. To
perform these tasks using DataSocket technology two basics steps must be performed:
• Open a DataSocket connection using a name you choose to identify the data.
• Write data to that connection as you compute new results.
The graphical user interfaces (GUI) of the server station, clients and remote
controller are shown in Figures 2 to 4 respectively. In the GUI of the server station,
Figure 2, the actual controller status, the controller parameters, set point and process
variables are indicated. Two graphics can also be seen where the controlled variable and
the signal sent to the final control element are represented. In the box situated at the left
top corner of the GUI is indicated the IP address of the computer where the remote
controller application is running. In the client GUI, Figure 3, the data received from the
server station are represented. Analogously to Figure 2, the IP address of the server
station is indicated in the box situated at the left top corner of the GUI. In Figure 4 theGUI of the remote controller is shown. In this application, the control status, acid flow,
set point or controller parameters can be modified and sent to the server station, whose
IP address must be given to the program. This application is protected with a password
in order to avoid running simultaneously this application from different computers.
Finally in Figure 5 a part of the block diagram corresponding to the server station can be
seen. It illustrates how to write and read the process data using DataSocket.
8/4/2019 Using Labview to Teach Process Control Laboratory Courses Through the Internet.