LabVIEW入门最佳教材

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Customising the program (text)

Select “text tool” from tools palette

Cursor now changes function

Changing the name of the input


Use “text tool” to highlight and edit the names (grey) numeric control Use “text tool” to highlight and edit the name (grey) numeric indicator
13
Adding two numbers - running the program

Select “arrow” from tools palette

Cursor now changes function Use arrow tool to “click” single arrow on front panel to run once Or “click” looped arrow on front panel to run continuously Use arrow tool to “click” red stop button

Digital controls to function inputs Function output to digital indicator
12
Useful tips - controls and indicators and terminals

Do not confuse controls (data inputs) with indicators (data outputs)

Changing the input

Text field

If running continuously then program is interactive
Up/down arrows
15
Adding two numbers - saving the program

Select “save” from within the file menu When prompted enter filename Note in windows LabView files have a ***.vi file extension

select “show panel” from “window” menu select “show controls palette” from “window” menu
The controls palette
5
LabView - diagram


Functions (program operations) can be selected from the “functions” window and placed on the diagram. To find functions

vi - stands for virtual instrument

DO IT NOW AND KEEP DOING IT!
16
Useful tips - changing the program

பைடு நூலகம்
When a LabView program is running it IS possible to change the setting of the controls, i.e. change the data inputs When a LabView program is running it IS NOT possible to change to wiring of the program To make changes to the program you need to stop it first!
Run continuously

Running the program


Stop the program Run once

Stopping the program

14
Adding two numbers operating the program

Select “finger hand” or “text tool” from tools palette
3
LabView - getting going

Opening LabView (windows)

“Double-click” on LabView Icon LabView start-up appears From within the Linux “Shell” type “labview &” LabView start-up appears

Cursor now changes function Use “finger” on up/down arrows of numeric controls Or use “text tool” to highlight and edit number field (white) within numeric control
Indicator text field
Control text field
LabView Physics 3 - IT skills
Miles Padgett m.padgett@physics.gla.ac.uk
1
Objectives

To acquire familiarity with the LabView Programming language To be able to write LabView programmes incorporating pre written and new VI’s To use LabView in the study of 2-D diffraction patterns You get exercise marks for completion of each milestone.


select “show diagram” from “window” menu select “show functions palette” from “window” menu
The functions palette
6
LabView - tools


Tools (cursor/mouse functions) can be selected from the “tool” window To find tools

select “show tools palette” from “window” menu

Some issues of LabView give option for auto-tool select TURN IT OFF!

The tools palette
Auto tools is turn off and on by clicking on the “green” button (Dark green is off)

Opening LabView (Linux)

The LabView icon


Programs themselves are called “vi” (virtual instruments) To start a new “vi”, select “new vi” from the LabView start up screen

Wiring an indicator to the input of a function will generate an error Wiring a control to the output of a function will generate an error


Double (left) clicking on any terminal on the diagram (white) will highlight the associated control or indicator on the front panel (grey) Double (left) clicking on any control or indicator on the front panel (grey) will highlight the associated terminal on the diagram (white)
Click to turn off auto tools
7
Using LabView to add two numbers

Create new program

Select “new VI” from the file menu Selecting a digital control


Select a digital control from the controls palette and place it on the front panel (grey) Do the same again Select a digital indicator from the controls palette and place it on the front panel
2
LabView - the basics

All LabView programmes comprise two screen types
The
“front panel” (grey) which acts as the user interface The “diagram” (white) which contains the “programme”
The LabView start up screen
4
LabView - front Panel


Controls (data input) and indicators (data output) can be selected from the “controls” window and placed on the front panel. To find controls
Selecting a digital indicator
8
Adding two numbers - front panel


Controls and indicator placed on front panel N.B. software automatically numbers controls of the same type in sequence

Select “wiring tool” from tools palette

Cursor now changes function “click” on wire start point “drag” to end point then “release”

Use wiring tool to connect
The front panel
9
Adding two numbers - diagram

Data terminals automatically appear on diagram
The diagram
10
Adding two numbers - placing the function


Select and drag the “addition function onto the diagram To find addition

Selecting a numeric function
Show function panel Click on numeric Select and drag addition onto diagram
Dragging onto the diagram
11
Adding two numbers - wiring the function