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The power of LabVIEW lies in the hierarchical nature of the VI. After you create a VI, you can use it on the block diagramof another VI. There is no limit on the number of layers in the hierarchy. Using modular programming helps you manage changesand debug the block diagram quickly.

A VI within another VI is called a subVI. A subVI corresponds to a subroutine in text-based programming languages. When youdouble-click a subVI, a front panel and block diagram appear, rather than a dialog box in which you can configure options. Thefront panel includes controls and indicators that might look familiar. The block diagram includes wires, front panel icons,functions, possibly subVIs, and other LabVIEW objects that also might look familiar.

The upper right corner of the front panel and block diagram displays the icon for the VI. This icon is the same as the iconthat appears when you place the VI on the block diagram.

Icon and connector pane

After you build a front panel and block diagram, build the icon and theconnector pane so you can use the VI as a subVI. Every VI displays an icon, such as the one shown in , in the upper right corner of the front panel and block diagram windows. An icon is a graphicalrepresentation of a VI. It can contain text, images, or a combination of both. If you use a VI as a subVI, the iconidentifies the subVI on the block diagram of the VI. You can double-click the icon to customize or edit it.

You also need to build a connector pane, shown in , to use the VI as a subVI. The connector pane is a set of terminals that correspond to the controls andindicators of that VI, similar to the parameter list of a function call in text-based programming languages. Theconnector pane defines the inputs and outputs you can wire to the VI so you can use it as a subVI. A connector pane receivesdata at its input terminals and passes the data to the block diagram code through the front panel controls and receives theresults at its output terminals from the front panel indicators.

As you create VIs, you might find that you perform a certain operation frequently. Consider using subVIs or loops toperform that operation repetitively. For example, the block diagram in contains two identical operations.

You can create a subVI that performs that operation and call the subVI twice. The example in calls the Temperature VI as a subVI twice on its block diagram and functions the same as the previous blockdiagram.You also can reuse the subVI in other VIs. Refer to Repetition and Loops for more information about using loops to combine common operations.

Refer to the LabVIEW Basics II: Development Course Manual for more information about application development. The following pseudo-code and block diagramsdemonstrate the analogy between subVIs and subroutines.

Function Code Calling Program Code
main {average (point1, point2, pointavg)}
function average (in1, in2, out){ out = (in1 + in2)/2.0;}
SubVI Block Diagram CallingVI Block Diagram

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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Source:  OpenStax, Labview graphical programming. OpenStax CNX. Apr 09, 2015 Download for free at https://legacy.cnx.org/content/col11408/1.2
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