Paper - Asee peer logo
Contents
1. Proceedings of the 2003 American Society for Engineering Education Annual Conference amp Exposition Copyright 2003 American Society for Engineering Education LEZSES ebeg2. around 100 00 is available for students to buy online or from the University bookstore 10 Level flow process control system This system offers level and flow measurements and display Temperature displacement pressure and pH sensors and transducers will be added to provide input data to both LabVIEW and MATLAB through the data acquisition systems The integrated laboratory environment is capable of supporting a wide variety of experiments that can be performed during regular lab hours or through remote access using LabVIEW and MATLAB Access through MATLAB is limited to computers connected to the department network however access through LabVIEW will be available from anywhere there is an Internet connection Process control workshop This system offers real time control via MATLAB and Simulink This allows using the system for advanced control concepts and research oriented projects The process is This project is funded in part by the Air Force Research Office award F49620 01 1 0557 Proceedings of the 2003 American Society for Engineering Education Annual Conference amp Exposition Copyright 2003 American Society for Engineering Education Z cGe g obed represented by a heating element controlled by a thyristor circuit that feeds heat into the air stream circulated by an axial fan along a polypropylene tube A thyristor detector may be placed at one of three points along the tube sensing the temperatur
3. room temperature If the LED is lighting up as the program states then everything is working correctly Proceedings of the 2003 American Society for Engineering Education Annual Conference amp Exposition Copyright 2003 American Society for Engineering Education L ZG g obed lalxi He Edt View Go Cormuricator Hels i ae S S E S S S 8 Back orso Reload Home Seach Netscape Pit Secwiy Shop Stop Pa ak Bookmaks Ab Locatore Pip 77111154 tanacc edu BU Cantinoous 20T hemacouple 2oMeanutement Fim P Whar Related f instant Message E WebMail E Calendar 3 Rado ae TH Yetow Poges i Downoad T Customize Continuous Thermocouple Measurement Important Note Ifyou are not using Lal Time Engine or this web page was published using the Intemet Toolkit ust this an rize DAE Cored Pease enter passnord for host EEE A 1625K read ot 47 8K fec Pag Ason A 8 E vew DE Ef continuous Therm gee EDAD 0am aaa A 3 vew EcontinousT f continuous HTK pe6 ioa EID BBO DB ma Fig 4 Password screen Fig 5 Access granted Integrating a Video Camera National Instruments Measurement amp Automation Explorer MAX is available for Configuring Cameras 11 MAX automatically detects cameras and the available image acquisition board MAX also provides the functions to change the configuration or test the camera After MAX has launched the properties of the cam
4. Offers high precision thermocouple temperature measurement applications Interfaces with the SCXI 1100 1102 1102B 1102C The SCXI 1000 houses all of the component and power modules Its architecture includes the SCXI bus which routes analog and digital signals while acting as a communication conduit between modules The chassis has the following specifications Low noise environment for signal conditioning Rugged compact chassis Forced air cooling Combination chassis for SCXI and PXI Compact PCI modules House all SCXI modules Assembling the system requires the use of the SCXI 1349 shielded cable assembly and the SCXI 1357 high voltage backplane The cable assembly connects to the front end signal conditioning SXCI The high voltage backplane has the following specifications Cable lengths up to 2 m Connects SCXI systems to measurement devices Includes 4 slot high voltage analog bus Mounting bracket for reliable connection to the SCXI chassis Shielded for better accuracy multi chassis configurations available The SCXI 1124 is a 6 channel isolated source for DC voltage or current signals It is ideal for applications requiring isolated voltage or current outputs to a control process The SCXI 1124 comes with 6 isolated 12 bit channels that can be configured for any of the available unipolar or bipolar ranges This module has the following specifications 12 bit resolution 6 isolated channels 250 Vims working isolation per channel C
5. A screen will pop up with a URL address Copy this address and paste it into either Netscape s or Internet Explorer s address bar ONY ee Once the above steps are completed the VI should be seen on the web site The main server can grant anyone to take control of the VI but it also has the ability to regain control at any time Denying access to a VI can be accomplished as follows Go to the LabVIEW screen and click on Tools Options as noted before but this time click on Proceedings of the 2003 American Society for Engineering Education Annual Conference amp Exposition Copyright 2003 American Society for Engineering Education 9 2G g obed Web Server Browser Access Here you are given the options to allow viewing and controlling only viewing or to deny access In the small window above these choices type the Internet Provider s address s of computers that should not have access to this VI and click OK This will forbid users of those computers from opening the Web site The Internet Toolkit The Internet Toolkit is another easy way to publish a VI with password protection It does not however allow a user to control the VI remotely To use the Internet Toolkit follow these instructions 1 Go to the VI you want to publish click on Tools and scroll down to Internet Toolkit and click on Internet Toolkit Configuration See Fig 2 2 Once in the Configuration menu click on
6. D Schmidt A multidisciplinary digital control systems laboratory 2002 ASEE Annual Conference Proceedings Session 1526 14 pages 2 R Ramachandran R Ordonez S Farrell Z Gephardt and H Zhang Multidisciplinary control experiments based on the proportional integral derivative PID concept 2001 ASEE Annual Conference Proceedings Session 1526 17 pages 3 R O Brien Jr Matlab simulation projects for a first course in linear control systems 2000 ASEE Annual Conference Proceedings Session 2520 7 pages 4 B Diong Providing an updated dynamic systems and controls lab experience 1999 ASEE Annual Conference Proceedings Session 2532 9 pages 5 N Swain J anderson M swain and R Korrapati State space analysis of linear time invariant control systems using virtual instruments 2001 ASEE Annual Conference Proceedings Session 1547 7 pages 6 L Sokoloff LabVIEW implementation of ON OFF controller 1999 ASEE Annual Conference Proceedings Session 3659 10 pages Proceedings of the 2003 American Society for Engineering Education Annual Conference amp Exposition Copyright 2003 American Society for Engineering Education orZSeg abed 7 N Kim Process control laboratory experiments using LabVIEW 2001 ASEE Annual Conference Proceedings Session 3220 15 pages 8 Egarievwe S Okobiah O Ajiboye O Fowler L Thorne S and Collins W Internet Applicatio
7. Session 1620 Data Acquisition for Process Monitoring and Control Rafic Bachnak and Carl Steidley Texas A amp M University Corpus Christi Corpus Christi TX 78412 Abstract Texas A amp M University Corpus Christi recently finished equipping the Control Systems Laboratory with data acquisition systems and process training equipment The laboratory provides several capabilities including internet based experimentation data acquisition process measurements control system modeling and design sensor technology applications neural networks and signal processing This paper describes the major laboratory equipment and the implementation of online experiments that offer data acquisition monitoring and control from remote locations A front panel in LabVIEW displays the results and allows storage of acquired data for later processing A digital camera that provides real time pictures of the monitored equipment is part of the system configuration Introduction Laboratory development is a major task that faculty at institutions of higher education are constantly addressing 1 3 Texas A amp M University Corpus Christi A amp M CC recently established a new Control Systems Laboratory that provides interdisciplinary educational and research capabilities across several science and engineering areas These areas include sensor technology data acquisition control system design system modeling signal and image processing neural networks and dat
8. User File Editor Add the names you wish to grant access and assign them their passwords Save this file under users txt in the internet http conf directory See Fig 3 3 Repeat the steps for the Group File Editor but call it groups txt Click Done 4 Create a directory called special in the internet home directory and save the VI as a web page in this directory 5 In this menu click New Panel and choose the VI needed Then click on Edit Directories and find the directory it is located in 6 Once all of the settings have been completed click on Start Server Be sure that you disable the Web Publishing Tool server Two servers cannot work together Operate EEE Browse Window Help QW Measurement amp Automation Explorer Instrumentation Data Acquisition k Temperature History Compare Source Code Controt MI Revision History User Name Build Application or Shared Library DLL Library Manager DocumentRoot Program Fles National I mal 8home special New HTML De Fig 2 Internet toolkit configuration Fig 3 Granting access screen Testing the System The system was tested using Netscape Typing in the address of the VI will display a user id and password screen as shown in Fig 4 Typing in a proper ID and password will result in displaying the image in Fig 5 Running the VI will continuously display
9. a visualization The laboratory supports several courses and gives Computer Science CS and Engineering Technology ET students unique training opportunities and benefits by having both groups work on interdisciplinary projects The ability to monitor and control processes from remote locations makes proper and timely analysis possible Advances in networking technologies and development of measurement hardware and software has turned PCs into platforms capable of continuous remote monitoring using the Internet A software program that facilitates the developments of such applications is LabVIEW 4 9 The software allows embedding a user on a web page with access to the system Access can be granted using security features available though the software Features such as password protection can prevent private information from being viewed by the general public This features is especially useful for offering online experimentation where students need to gain access to inaccessible laboratories outside of their class time This paper presents the process Proceedings of the 2003 American Society for Engineering Education Annual Conference amp Exposition Copyright 2003 American Society for Engineering Education L zge g obed for developing online experiments for process monitoring and control using a data acquisition system that was developed for use in a control systems course The Laboratory The Data Acquisition and Control Laborat
10. assigned numbers given in the subVI called Temp and inserting the subVI called analog input and adding a DAQ channel control The diagram is also modified so that an output voltage of five volts is sent through the output channel to the LED LabVIEW comes with many Internet capabilities It allows a user to publish a static report on the Internet share data for processing data storage or data monitoring It also allows the user to control a process from a remote location and provides distributed execution of a program The Web Publishing Tool The Web Publishing Tool facilitates publishing a VI on the Internet while granting and denying access to certain computers The following steps are necessary for publishing a VI to the Web 1 Run the VI to make sure it is working as required The VI must stay open on the main computer The server will not recognize a closed VI 2 Go to Tools and click on Options This will lead to a pull down menu where both configuration of the web server and browser access can take place Go through the pull down menu and click on Web Server Configuration In this screen click on Enable Web Server to start up the server After clicking OK head back to Tools and click on Web Publishing Tool On this screen choose the VI to be published Choose the embedded label and type any text that is needed on the Web page Once this is accomplished click on Save to Disk
11. e at that point The volume of air flow is controlled by varying the speed of the fan via a potentiometer The system allows experimentation with distance and velocity lag calibration proportional control disturbance and system response and frequency response Wireless logging system The logging system consists of two wireless data loggers communicating to a base station consisting of a modem and application software The software allows a variety of functions including instrument setup data collection creating real time trend graphs and other data acquisition tasks The wireless data loggers use spread spectrum radio transmission to reliably send data with a high degree of immunity to electrical noise and interference Range of transmission may be up to 120 m inside buildings and to over 300 m line of sight The base station can support up to 20 remote data loggers The software allows exporting data in real time to Lotus 1 2 3 and Excel by using a Dynamic Data Exchange DDE link PC workstations and test equipment The PC workstations are interfaced to the data acquisition systems A direct connection exists between one of the PCs and the process control workshop Test equipment that supports the laboratory includes thermocouple calibrators digital thermometers temperature calibrators scopemeters hand held meters multi meters function generators power supplies and frequency counters The Data Acquisition System The da
12. era can be set by right clicking on the camera name in the IMAQ IEEE 1394 Devices folder in the MAX configuration tree See Fig 6 A user can select Properties from the pop up menu and adjust the attributes of the camera and click OK to save the camera file Three NI IMAQ image acquisition types are available in LabVIEW snap grab and sequence A snap acquires a single image into a memory buffer A grab is a continuous high speed acquisition of data This function performs an acquisition that continuously loops so it is suitable for the Web Cam applications Two VIs IMAQ1394 Grab Setup and IMAQ1394 Grab Acquire should be used for a grab acquisition IMAQ1394 Grab Setup initializes the acquisition and starts capturing the image to an internal software buffer IMAQ1394 Grab Acquire copies the image currently stored in the internal buffer to a LabVIEW image buffer A sequence initiates a variable length and variable delay transfer to multiple buffers A sequence can be used in applications that process multiple images There are two main ways to display images 12 First a user can use IMAQ WindDraw provided by IMAQ Vision IMAQ WindDraw provides a good functionality so it can display any type of images JPG PNG BMP 8 bit or 16 bit monochrome image RGB image etc and any acquisition types snap grab and sequence However it doesn t support Web Publishing Tool Another way to display the images is to use picture control in LabVIEW It su
13. n of LabVIEW in Computer Based Learning European Journal of Open and Distance Learning 2000 9 Travis J Internet Applications in LabVIEW Prentice Hall 2000 10 MATLAB Student Version Release 13 including the Control Systems Toolbox The MathWorks http www mathworks com products studentversion index shtml 11 National Instrument Getting Started with NI IMAQ for IEEE 1394 Cameras Available at http www ni com pdf manuals 322885a pdf 12 National Instrument NI IMAQ for IEEE 1394 Cameras User Manual Available at http Awww ni com pdf manuals 370362a pdf Biography RAFIC BACHNAK Rafic Ray Bachnak is an Associate Professor of Engineering Technology at Texas A amp M University Corpus Christi He received his B S M S and Ph D degrees in Electrical and Computer Engineering from Ohio University in 1983 1984 and 1989 respectively Dr Bachnak was previously on the faculty of Franklin University and Northwestern State University CARL STEIDLEY Carl Steidley is Professor of Computer Science and Chair of the Department of Computing and Mathematical Sciences at Texas A amp M Corpus Christi His interests are in the applications of artificial intelligence real time computing and robotics He taught computer science at Southeastern La Univ Central Washington Univ and Oregon Institute of Technology He has research at NASA Ames Research Center Oak Ridge Natl Labs and Electro Scientific Industries in Portland
14. ombine output channels for larger voltage ranges For isolated DC voltage and current output Independently configure channels for voltage or current Driver Software NI DAQ Software for Windows 2000 NT Me 9x or Mac OS Application Software LabVIEW Measurement Studio and Lookout Proceedings of the 2003 American Society for Engineering Education Annual Conference amp Exposition Copyright 2003 American Society for Engineering Education v zge g obed The SCXI 1325 is a screw terminal block that has 26 terminal for signal connections to the SCXI 1124 module This module has the following specifications 26 screw terminals for signal connections For isolated analog output applications For use with the SCXI 1124 Mounts to front of SCXI module Shielded for quick convenient signal connections Installing the components involves the following steps First the data acquisition board PCI MIO 16E 4 and all of its drivers are inserted into a PC that already contains LabVIEW Second the chassis SCXI 1000 is attached to the board using the cable Once this is completed the signal conditioning module SCXI 1124 and the 32 Channel Amplifier SCXI 1102C can be inserted into the chassis Finally the Screw Terminal Block SCXI 1325 is connected to the SCXI 1124 and the Isothermal Terminal Block SCXI 1303 to the SCXI 1102C Fig 1 shows a picture of the actual system with wiring from the thermocouple to the input channel and from the ou
15. ory consists of the following major equipment desktop computer stations data acquisition systems software MATLAB and LabVIEW level and flow measurement system process control system wireless data loggers calibrators and a variety of test equipment The following paragraphs briefly describe the features and capabilities of some of the major components Data acquisition systems Each system consists of several components including a data acquisition board signal conditioning units mounting terminal block and chassis These components are integrated into real time measurement units that interface to desktop computers and process control equipment The National Instruments NI Software Solutions Department license which consists of LabVIEW 6 1 control and simulation toolkit Internet Gmath and signal processing suites is used for programming these units MATLAB and associated toolboxes MATLAB is one of the most popular programming languages used worldwide for a range of computing tasks in engineering and science The package available in the laboratory consists of MATLAB 6 5 Simulink 5 0 1 Data Acquisition Toolbox Signal Processing Toolbox Control Systems Toolbox Instrument Control Toolbox Image Processing Toolbox Neural Networks Toolbox MATLAB C C Graphics Library MATLAB C C Math Library MATLAB Compiler and Symbolic Math A MATLAB Student version that has most of the full version capabilities at a reasonable price
16. pports Web Publishing Tool but a user has to know the exact image type For instance IEEE 1394 Cameras usually support three kinds of the image types 8 bit and16 bit monochrome and RGB images Proceedings of the 2003 American Society for Engineering Education Annual Conference amp Exposition Copyright 2003 American Society for Engineering Education g zGE g obed camfl sony Fig 6 Properties menu in MAX Figure 7 and 8 are the Front Panel and the Block Diagram of a Web Cam application This application uses the grab acquisition type to continuously acquire RGB images captured by a Sony DFW V1500 camera Fig 7 Block diagram of a Web Cam application Proceedings of the 2003 American Society for Engineering Education Annual Conference amp Exposition Copyright 2003 American Society for Engineering Education 6 zS g obed is Temperature System vi s Ele Edt Qperate Took Browse Window Help ola Su emr E Fig 8 Front panel of a Web Cam application Conclusion This paper presented a closed loop data acquisition system and used it to illustrate a process monitoring and control application Using either the Internet Toolkit or the Web Publishing Tool a programmer can easily grant or deny access to networked computers The implementation of a digital video camera that offers real time images on the published front panel was also described Bibliography 1 G Plett and
17. ta acquisition system consists of a data acquisition board PCI MIO 16E 4 terminal blocks SCXI 1303 and SCXI 1325 signal conditioning hardware SCXI 1102 and a digital to analog conversion module SCXI 1124 The PCI MIO 16E 4 has the following specifications e NI DAQ driver with Measurement amp Automation Explorer for easy configuration for Win 2000 NT Me 9x and Mac OS e Two 12 bit analog outputs 8 digital I O lines two 24 bit counters e Up to 16 analog inputs 12 bit resolution up to 500 kS s sampling rate The SCXI 1102C is ideal for higher bandwidth analog signals Each channel can be configured for a gain of 1 or 100 allowing any combination of thermocouples to be used This module has the following specifications 10 kHz low pass filter on every channel 32 channels up to 333 kHz scanning rates For low bandwidth mV volt and current inputs 1102B 1102C Over voltage protection to 42V Proceedings of the 2003 American Society for Engineering Education Annual Conference amp Exposition Copyright 2003 American Society for Engineering Education e zge g obed e Programmable instrumentation amplifier on every channel The SCXI 1303 connects to the SCXI 1102C and is designed for high accuracy thermocouple measurements This module has the following specifications Isothermal construction that minimizes errors caused by thermal gradients Mounts to front of SCXI module Open thermocouple detection circuitry
18. tput channel to an LED The input channel was channel 11 of the SCXI 1303 and the output channel was channel 2 of the SCXI 1325 Fig 1 Data acquisition system set up Proceedings of the 2003 American Society for Engineering Education Annual Conference amp Exposition Copyright 2003 American Society for Engineering Education Gzse g obed Online Data Acquisition Monitoring and Control MAX is a program that comes with the professional version of LabVIEW It is used to configure the data acquisition system The instruction tree in MAX has two important folders One of the folders is called Data Neighborhood This folder is where channels are assigned and are given values to use throughout the data acquisition process The software gives the user the option to click on Create New Virtual Channel and then choose the type of channel needed Analog Input Analog Output and Digital I O are the choices it provides The other folder is called Devices and Interfaces Here the modules that have been connected should be listed and can be configured by choosing properties Once all of the modules and channels have been configured they can be tested using the button called Test Panel The Temperature System Demo VI that comes with LabVIEW was modified to accomplish real time measurements by reading data coming through the channels that were configured in MAX The wiring diagram is reprogrammed by removing the randomly
Download Pdf Manuals
Related Search