LabVIEW Basics 2 for 6.1.pdf

LabVIEW TM Basics II

Development

Course Manual

Course Software Version 6.1

December 2001 Edition

Part Number 320629J-01

LabVIEW Development Course Manual

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photocopying, recording, storing in an information retrieval system, or translating, in whole or in part, without the prior written

consent of National Instruments Corporation.

Trademarks

LabVIEW™, National Instruments™, and ni.com™ are trademarks of National Instruments Corporation.

Product and company names mentioned herein are trademarks or trade names of their respective companies.

Patents

For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software,

the patents.txt file on your CD, or ni.com/legal/patents .

Worldwide Technical Support and Product Information

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Contents

Student Guide

A. About This Manual ...............................................................................................v

B. What You Need to Get Started .............................................................................vi

C. Installing the Course Software..............................................................................vii

D. Course Goals and Non-Goals ...............................................................................viii

E. Course Conventions ..............................................................................................ix

Lesson 1

Planning LabVIEW Applications

A. The Planning and Design Process.........................................................................1-2

B. The Implementation Process.................................................................................1-3

C. Error Handling Techniques...................................................................................1-4

D. LabVIEW Programming Architectures ................................................................1-9

E. VI Templates.........................................................................................................1-20

Lesson 2

Front Panel Design

A. Basic User Interface Issues ...................................................................................2-2

B. Using Boolean Clusters as Menus ........................................................................2-13

C. Viewing and Controlling Front Panels Remotely.................................................2-22

D. Viewing and Controlling Front Panels in LabVIEW............................................2-24

E. Viewing and Controlling Front Panels from a Web Browser...............................2-28

F. Property Nodes .....................................................................................................2-32

G. Graph and Chart Properties...................................................................................2-44

H. Control References ...............................................................................................2-53

I. LabVIEW Run-Time Menus (Optional)...............................................................2-57

J. Intensity Plots (Optional)......................................................................................2-63

Lesson 3

Block Diagram Design

A. Hierarchical Design ..............................................................................................3-2

B. Dataflow................................................................................................................3-3

C. Use Good Wiring Techniques...............................................................................3-4

D. Error Handling ......................................................................................................3-7

E. Memory and Speed Optimization .........................................................................3-11

iii

LabVIEW Development Course Manual

Contents

F. Using Comments in Block Diagram .....................................................................3-13

G. Monitoring VI Performance Using the Profile Window ......................................3-14

H. Block Diagram Checklist......................................................................................3-18

Lesson 4

Data Management Techniques

A. Data Management Techniques in LabVIEW........................................................4-2

B. Local Variables .....................................................................................................4-3

C. Global Variables ...................................................................................................4-12

D. Using Local and Global Variables Carefully........................................................4-20

E. DataSocket ............................................................................................................4-23

Lesson 5

Advanced File I/O Techniques

A. Working with Byte Stream Files ..........................................................................5-2

B. LabVIEW Datalog Files .......................................................................................5-11

C. Disk Streaming .....................................................................................................5-19

Lesson 6

Project Management and Presentation

A. Assembling a LabVIEW Application ...................................................................6-2

B. LabVIEW Features for Project Development.......................................................6-15

C. LabVIEW Tools for Project Management............................................................6-20

D. Report Generation (Optional) ...............................................................................6-30

Appendix A

Performance

A. Monitoring VI Performance Using the Profile Window ......................................A-2

B. Speeding Up Your VIs..........................................................................................A-4

C. Optimizing VI Memory Use .................................................................................A-9

Appendix B

Additional Resources

A. Polymorphic VIs ...................................................................................................B-2

B. Custom Graphics in LabVIEW.............................................................................B-6

C. LabVIEW Web Server..........................................................................................B-13

D. Additional Information .........................................................................................B-19

E. ASCII Character Code Equivalents Table ............................................................B-21

LabVIEW Development Course Manual

ni.com

Student Guide

Thank you for purchasing the LabVIEW Basics II: Development course kit.

You can begin developing an application soon after you complete the

exercises in this manual. This course manual and the accompanying

software are used in the two-day, hands-on LabVIEW Basics II:

Development course. You can apply the full purchase of this course kit

towards the corresponding course registration fee if you register within 90

days of purchasing the kit. Visit the Customer Education section of ni.com

for online course schedules, syllabi, training centers, and class registration.

A. About This Manual

This course manual teaches you how to use LabVIEW to develop test

and measurement, data acquisition, instrument control, datalogging,

measurement analysis, and report generation applications. This course

manual assumes that you are familiar with Windows, Macintosh, or UNIX,

that you have experience writing algorithms in the form of flowcharts or

block diagrams, and that you have taken the LabVIEW Basics I:

Introduction course or that you have equivalent experience.

The course manual is divided into lessons, each covering a topic or a set of

topics. Each lesson consists of the following:

• An introduction that describes the purpose of the lesson and what you

will learn

• A description of the topics in the lesson

• A set of exercises to reinforce those topics

• A set of additional exercises to complete if time permits

• A summary that outlines important concepts and skills taught in the

lesson

Several exercises in this manual use a plug-in multifunction data acquisition

(DAQ) device connected to a DAQ Signal Accessory containing a

temperature sensor, function generator, and LEDs.

LabVIEW Development Course Manual

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