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In this section, you will learn about LabVIEW debugging techniques.

If a VI does not run, it is a broken, or nonexecutable, VI. The Run button often appears broken, shown at left, when you create or edit a VI. If it is still broken when youfinish wiring the block diagram, the VI is broken and will not run. Generally, this means that a required input is not wired,or a wire is broken.

Finding errors

Click the broken Run button or select Windows>>Show Error List to display the Error list window, which lists all the errors. Double-click an error description to display therelevant block diagram or front panel and highlight the object that contains the error.

Execution highlighting

View an animation of the execution of the block diagram byclicking the Highlight Execution button, shown in . Execution highlighting shows the flow of data on the block diagram from one node to anotherusing bubbles that move along the wires. Use execution highlighting in conjunction with single-stepping to see howdata move from node to node through a VI.

Execution highlighting greatly reduces the speed at which the VI runs.

Single-stepping

Single-step through a VI to view each action of the VI on the block diagram as the VI runs. The single-steppingbuttons affect execution only in a VI or subVI in single-step mode. Enter single-step mode by clicking the Step Over or Step Into button. Move the cursor over the Step Over , Step Into , or Step Out button to view a tip strip that describes the next step if you clickthat button. You can single-step through subVIs or run them normally.

If you single-step through a VI with execution highlighting on, anexecution glyph, shown in , appears on the icons of the subVIs that are currently running.

Probes

Use the Probe tool, shown in , to check intermediate values on a wire as a VFI runs. Whenexecution pauses at a node because of single-stepping or a breakpoint, you also can probe the wire that just executedto see the value that flowed through that wire.

You also can create a custom probe to specify which indicator you use to view the probed data. For example, ifyou are viewing numeric data, you can choose to see that data in a chart within the probe. To create a custom probe,right-click a wire and select Custom Probe>>New from the shortcut menu.

Breakpoints

Use the Breakpoint tool, shown in , to place a breakpoint on a VI, node, or wire on the block diagram and pause execution at thatlocatiFon. When you set a breakpoint on a wire, execution pauses after data pass through the wire. Place a breakpointon the block diagram workspace to pause execution after all nodes on the block diagram execute. When a VI pauses at abreakpoint, LabVIEW brings the block diagram to the front and uses a marquee to highlight the node or wire thatcontains the breakpoint. LabVIEW highlights breakpoints with red borders for nodes and block diagrams and red bullets forwires. When you move the cursor over an existing breakpoint, the black area of the Breakpoint tool cursor appears white. Use the Breakpoint tool to click an existing breakpoint to remove it.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
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
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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