Presentation on LabVIEW Basics

INTRODUCTION LabVIEW ENVIRONMENT LabVIEW PROGRAMMING CONCEPT SOFTWARE CONSTRUCTS IN

LabVIEW

PRESENTATION ON LabVIEW

INTRODUCTION

• LabVIEW is the acronym for Laboratory Virtual Instrument Engineering Workbench

• It is a Graphical-based programming language• VI (virtual instrument) is the basic LabVIEW

element• Programming languages such as C, C++,BASIC

use functions and subroutines LabVIEW uses VI

BENEFITSExtensive Interface - Even people with limited

coding experience can write programs and deploy solutions in reduced time interval.It also includes An interface to .NET framework assembly

Code Reuse and Platform independent -The G-code is independent of the operating system

Parallel Processing- Easy to code programs with multiple tasksperformed in parallel by multithreading

APPLICATIONS OF LabVIEW

Machine monitoring and control :LabVIEW Real-Time module helps in preparing powerful machine monitoring and control applications

Research and Analysis : Scientist and Researchers use it biomedical ,aerospace energy industries etc .

Control Design : Real world data can be compared with theoretical data .

Analogy between LabVIEW and C

• VI FUNCTION• DRAG-DROP UNITS COMMANDS• BLOCK DIAGRAM COMMAND WINDOW

• FRONT PANEL USER INTERFACE• FILE EXTENSION .VI .C• MATH-SCRIPT math.stdio and lot more …..

FRONT PANEL •

BLOCK DIAGR

AM

CONNECTOR PANE

LabVIEW Environment

A VI has three main parts A. Front PanelB. Block DiagramC. Connector Pane Front Panel: Interacts with the user Block Diagram: Contains the code Connector Pane: Method of connecting to other

VI’s

Front Panel

• Right click controls palette pop's up• Connector pane (terminal connector) is a part

of front panel• Caption and Label both are front panel

properties• Traditional Debugging features not available

for front panel

FRONT PANEL

It is the user interface

Block Diagram

• Label is block diagram property• Right click functions palette pop's up• Traditional debugging features and clean up

diagram option(ctrl+u) available only for block diagram

BLOCK DIAGRAM

It contains the code

Connector Pane

Means of Passing Data to other VIThe Connector Pane terminals display

the color of data

CONNECTOR -PANE

Means of passing data to other VI

BUILT-IN-HELP

This is enabled by selecting this item from the Help pull-down menu

If the cursor is placed over the particular button, a small box pops up with its description

It is also activated from the Help pull-down menu by selecting Show Help (Ctrl+H)

LabVIEW Programming Concept

LabVIEW follows Data-Flow programmingThe process to determine the execution of

program is called Arbitrary-InterleavingDuring compilation the VI compiler constructs a

wired tableLabVIEW functions are polymorphic LabVIEW is not an interpreted language it is

compiled behind the scenes by LabVIEW’s execution engine

LabVIEW constructs a wire table for the VIThis wire table identifies elements in the block

diagram that have inputs needed for that element to run

A LabVIEW program is executed by pressing the arrow or the Run button located in the palette along the top of the window

LabVIEW has three paletteso Functions Paletteo Control Paletteo Tools Palette

CONTROL PALETTE

Invoke the control palette by clicking VIEW-CONTROL PALETTE or by right clicking on the front panel

The controls are grouped into categories in a tree

The sub palettes have a lock in the top left corner to keep the window visible while you are working with the controls

FUNCTION PALETTE

Invoke the function palette by VIEW-FUCNTION PALETTE or by right clicking on the block diagram

The functions are grouped into categories

TOOLS PALETTE

VARIOUS TOOLS Automatic tool selectionOperating value PositioningLabeling WiringShort-cut menuScrollingBreakpointProbeGet colorColoring

DATA TYPES Numeric StringDynamic Data type BooleanEnumRingWaveformVariantTimestamp

STRUCTURES

While-loop- Executes at least once then execute the conditional terminal

For-loop- for(i=0,i<N,i++)If-Else – if (condition) body1

else body2Switch – switch (case1) (case2)……

• FOR LOOPN=count terminali=iteration count

WHILE LOOPi=Iteration count

Stop Button =test for stop condition(by default it is stop if true)

If-Elseif ‘?’ gets value 1, T is executedif it gets value 0 ,F is executed

SWITCH CASE(MULTIPLE CASE)

? – CONDITIONAL TERMINALUPPER BOX DISPLAY THE CASE NUMBER