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  • Virtual instruments (VIs) contain three main components-the front panel, the block diagram, and the icon and connectorpane.
  • The front panel is the user interface of a VI and specifies the inputs and displays the outputs of the VI.
  • The block diagram contains the graphical source code composed of nodes, terminals, and wires.
  • Use the Tools palette to create, modify, and debug VIs. Press the Shift key and right-click to display a temporary version of the Tools palette at the location of the cursor.
  • Use the Controls palette to place controls and indicators on the front panel. Right-click an open space onthe front panel to display the Controls palette.
  • Use the Functions palette to place VIs and functions on the block diagram. Right-click an open space onthe block diagram to display the Functions palette.
  • Use the Search button on the Controls and Functions palettes to search for controls, VIs, and functions.
  • All LabVIEW objects and empty space on the front panel and block diagram have associated shortcut menus, which youaccess by right-clicking an object, the front panel, or the block diagram.
  • Use the Help menu to display the Context Help window and the LabVIEW Help , which describes most palettes, menus, tools, VIs, functions, andfeatures.
  • Select Help>>Search the LabVIEW Bookshelf to display the LabVIEW Bookshelf , which you can use to search PDF versions of all the LabVIEW manuals and Application Notes .
  • You build the front panel with controls and indicators, which are the interactive input and output terminals of theVI, respectively.
  • Control terminals have a thicker border than indicator terminals. To change a control to an indicator or to changean indicator to a control, right-click the object and select Change to Indicator or Change to Control from the shortcut menu.
  • The block diagram is composed of nodes, terminals, and wires.
  • The broken Run button appears on the toolbar to indicate the VI is broken. Click the broken Run button to display the Error list window, which lists all the errors.
  • Use execution highlighting, single-stepping, probes, and breakpoints to debug VIs by animating the flow of datathrough the block diagram.

Tips and tricks


  • Frequently used menu options have equivalent keyboard shortcuts. For example, to save a VI, you can select File>>Save or press the Ctrl-S keys. Common keyboard shortcuts include the following:
  • Ctrl-r

    Runs a VI.
  • Ctrl-e

    Toggles between the front panel and block diagram.
  • Ctrl-h

    Toggles display of the Context Help window.
  • Ctrl-b

    Removes all broken wires.
  • Ctrl-f

    Finds VIs, globals, functions, text, or other objects loaded in memory or in a specified listof VIs.
  • To increment or decrement numeric controls faster, use the Operating or Labeling tools to place the cursor in the control and press the Shift key while pressing the up or down arrow keys.
  • You can disable the debugging tools to reduce memory requirements and to increase performance slightly. Select File>>VI Properties , select Execution from the top pull-down menu, and remove the checkmark from the Allow Debugging checkbox.


  • Click the Show Context Help Window button on the toolbar to display the Context Help window. Use the Context Help window to determine which terminals are required. Required terminalsare bold, recommended connections are plain text, and optional connections are dimmed.
  • Press the spacebar to toggle the wire direction.
  • To move objects one pixel, press the arrow keys. To move objects several pixels, press the Shift key while you press the arrow keys.
  • To cancel a wire you started, press the Esc key, right-click, or click the terminal where you started the wire.
  • Use the tip strips that appear as you move the Wiring tool over terminals.
  • Display the connector pane by right-clicking the node and selecting Visible Items>>Terminals from the shortcut menu.
  • You can bend a wire by clicking to tack the wire down and moving the cursor in a perpendicular direction. To tackdown a wire and break it, double-click.
1. Tack Down a Wire by Clicking, 2. Tack and Break the Wire by Double-clicking


  • Use the following shortcuts to create constants, controls, and indicators:
    • Right-click a function terminal and select Create>>Constant , Create>>Control , or Create>>Indicator from the shortcut menu.
    • Drag controls and indicators from the front panel to the block diagram to create a constant.
    • Drag constants from the block diagram to the front panel to create a control.
  • To duplicate an object, press the Ctrl key while using the Positioning tool to click and drag aselection.
  • To restrict an object's direction of movement horizontally or vertically, use the Positioning tool to select the object and press the Shift key while you move the object.
  • To keep an object proportional to its original size as you resize it, press the Shift key while you drag the resizing handles or circles.
  • To resize an object as you place it on the front panel, press the Ctrl key while you click to place the object and drag the resizing handles or circles.
  • To replace nodes, right-click the node and select Replace from the shortcut menu.
  • To display the block diagram of a subVI from the calling VI, press the Ctrl key and use the Operating or Positioning tool to double-click the subVI on the block diagram.
  • To display the front panel of a subVI from the calling VI, use the Operating or Positioning tool to double-click the subVI on the block diagram. You also canselect Browse>>This VI's SubVIs .
  • After you type a label, press the Enter key to end text entry.
  • To add items quickly to ring controls and Case structures, press the Shift-Enter keys after each item. Pressing Shift-Enter accepts the item and positions the cursor to add the next item. Refer to Making Decisions in a VI for more information about Case structures.
  • To copy the color of one object and transfer it to a second object without using a color picker, use the Color Copy tool to click the object whose color you want to copy. Use the Coloring tool to click the object to which you want to apply thecolor. You also can copy the color of one object by using the Coloring tool and pressing the Ctrl key.
  • Select Edit>>Undo if you make a mistake.
  • To create more blank space on the block diagram, press the Ctrl key while you use the Positioning tool to draw a rectangle on the block diagram.


  • When single-stepping, use the following keyboard shortcuts:
  • Ctrl-down arrow

    Steps into a node.
  • Ctrl-right arrow

    Steps over a node.
  • Ctrl-up arrow

    Steps out of a node.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
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..
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
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.
yes that's correct
I think
Nasa has use it in the 60's, copper as water purification in the moon travel.
nanocopper obvius
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
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
analytical skills graphene is prepared to kill any type viruses .
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
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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