Navigating LabVIEW
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TOPICS
ni.com/training1
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About Me
Izabela Horvath Studenta an 4 Facultatea de Electrotehnica si
Electroenergetica, Specializare ET LabVIEW Student Ambassador
UPT Certified LabVIEW Developer Intern at National Instruments in 2014 [email protected]
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Course Webpage
Romania.ni.com/upt
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ni.com/trainingDr. James Truchard
National InstrumentsLeader in data acquisition technology with innovative modular instruments and LabVIEW graphical programming software
Corporate headquarters in Austin, TX
Offices in nearly 50 countries
35,000+ companies served annually
Approx. 7,100 employees
More than 1,000 products
600 Alliance Partners
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Platform-Based Approach
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Advanced Manufacturing Aerospace and Defense Consumer Electronics
Energy TransportationWireless
Diversity of Applications
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Getting the Most out of This Course
• Ask questions!• Experiment with hands-on exercises to
understand the methods used• Explore solutions• Implementations explore a possible
solution - you may find a better one
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TOPICS
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Navigating LabVIEW
A. What Is LabVIEW?B. Project ExplorerC. Parts of a VID. Front PanelE. Block Diagram
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F. Searching for Controls, VIs and Functions
G. Selecting a ToolH. DataflowI. Building a Simple VI
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A. What Is LabVIEW?
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Laboratory Virtual Instrumentation
Engineering Workbench
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What Is LabVIEW?— A graphical programming environment used
to develop sophisticated measurement, test and control systems.
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LabVIEW:• Interfaces with
wide variety of hardware• Scales across
different targets and OSs• Provides built-in
analysis libraries
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LabVIEW Language Characteristics
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LabVIEW Core 1 Topics
•Graphical•Dataflow-oriented•Compiled•Multi-platform
LabVIEW Core 2 and Later
Topics•Event-driven•Multi-threaded•Object-oriented•Memory- Managed
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B. Project Explorer
Project Explorer WindowFiles TypesProject Folders
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Project Explorer
• Find, access, and organize project files
• Prevent, detect, and resolve incorrect links
• Deploy or download files to targets
• Manage code for build options− Executables, installers,
and zip files
• Integrate with source code control providers
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LabVIEW Files
Common LabVIEW file extensions:
LabVIEW project —.lvprojVirtual instrument (VI) —
.viCustom control — .ctl
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Adding Folders to a Project
• Virtual folder− Organizes project
items and does not represent files on disk
• Auto-populating folder− Adds a directory on
disk to the project− LabVIEW continuously
monitors and updates the folder according to changes made in the project and on disk
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C. Parts of a VI
Front PanelBlock DiagramIconConnector Pane
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Parts of a VIVIs have 3 main components:
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Block diagram
Front panel
Icon/Connector pane
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Parts of a VI – Front Panel
You build the front panel with controls (inputs) and indicators (outputs).
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Front Panel – User interface for the VI
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Parts of a VI – Block Diagram
Front panel objects appear as terminals on the block diagram.
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Block Diagram – Contains the graphical source code
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Parts of a VI – Icon/Connector Pane
Icons and connector panes are necessary to use a VI as a subVI.− A subVI is a VI that appears on the block diagram of another
VI.− A subVI is similar to a subroutine or function in a text-based
programming language.
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Icon – Graphical representation
of a VI
Connector Pane – Map of the inputs and outputs of a
VI
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DEMONSTRATION
Using the Project Explorer and Starting a VI
• Open an existing project.• Identify the parts of a VI.• Create a new project.• Add and remove files and folders.• Create a new VI.
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D. Front Panel
Controls and IndicatorsObject StylesObject Types
Boolean NumericString
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Front Panel
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Controls and IndicatorsControls
− Input devices− Knobs, buttons, slides− Supply data to the
block diagram
Indicators− Output devices− Graphs, LEDs− Display data the block
diagram acquires or generates
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Front Panel Object Styles
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Numeric Controls and Indicators
The numeric data in a control or indicator can represent numbers of various types, such as integer or floating-point.
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Numericindicator
Numeric controlIncrement/Decrement
buttons
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Boolean Controls and Indicators• The Boolean data type represents data that
has only two options, such as True/False or On/Off.• Use Boolean controls and indicators to
enter and display Boolean (TRUE/FALSE) values.• Boolean objects simulate switches, push
buttons and LEDs.
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Booleancontrol
Booleanindicator
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Strings• The string data type is a sequence of ASCII
characters .• Use string controls to receive text from the
user.• Use string indicators to display text to the
user.
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E. Block Diagram
TerminalsNodesWiresHelp
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Block Diagram
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Block Diagram
Block diagram items:• Terminals• Constants• Nodes
− Functions− SubVIs− Structures• Wires• Free labels
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Terminals
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Same label name
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Terminals for Front Panel Objects• Terminals are:
– Entry and exit ports that exchange information between the front panel and block diagram.
– Analogous to parameters in text-based programming languages.
• Double-click a terminal to locate the corresponding front panel object.
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View Terminals as Icons
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• By default, View as Icon option enabled.• Deselect View as Icon
for a more compact view.
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Nodes
Nodes are objects on the block diagram that have inputs and/or outputs and perform operations when a VI runs.
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Nodes
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Function Nodes
• Functions are:− Fundamental operating elements of LabVIEW.− Do not have front panels or block diagrams,
but do have connector panes.− Has a pale yellow background on its icon.• Double-clicking a function only selects the
function. • Functions do not open like VIs and subVIs.
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SubVI Nodes
• SubVIs :− Are VIs that you use on the block diagram of
another VI.− Have front panels and block diagrams.− Use the icon from the upper-right corner of
the front panel as the icon that appears when you place the subVI on a block diagram.
• When you double-click a subVI, the front panel and block diagram open.• Any VI has the potential to be used as a
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Express VIs
• Express VIs:− Are a special type of subVI.− Require minimal wiring because you
configure them with dialog boxes.− Save each configuration as a subVI.• Icons for Express VIs appear on the
block diagram as icons surrounded by a blue field.
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VI Node View Options
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Structures
• Structures in LabVIEW have the form of frames.
• Other nodes (functions, subVIs, more structures) can be inserted into the frames.
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Wires
• Wires transfer data between block diagram objects.• Wires are different colors, styles, and
thicknesses, depending on their data types.
• A broken wire appears as a dashed black line with a red X in the middle.
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Scalar
Floating-point Integer String Boolean
1-D Array
2-D Array
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Constants
• Constants are the source of values just as control terminals, but their value is fixed in the code.
• You can create a constant of each data type.
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Free labels• A free label is a label (a text box) not
attached to any object. • Free labels can be put on the front panel or
block diagram. They are created by double-clicking on empty space in the window. • They can serve as comments or
instructions to the user of the application.
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Context Help• Displays basic
information about wires and nodes when you move the cursor over an object.• Can be shown or
hidden in the following ways:− Select Help»Show
Context Help from the LabVIEW menu.
− Press <Ctrl-H>.− Click the following
button on the toolbar:48
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LabVIEW Help• Contains detailed descriptions and instructions
for most palettes, menus, tools, VIs, and functions.
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• Can be accessed by:− Selecting Help»
LabVIEW Help from the menu.
− Clicking the Detailed help link in the Context Help window.
− Right-clicking an object and selecting Help from the shortcut menu.
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Examples
• LabVIEW includes hundreds of example VIs.• Use NI Example Finder
to browse and search installed examples.− Select Help»Find Examples in the menu.
• Click the example buttons in LabVIEW Help topics.
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GOAL
Group ExerciseConcept: Exploring a VI
Identify the parts of an existing VI.
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F. Searching for Controls, VIs and Functions
Palettes Quick DropNI Global Search
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Searching for Controls, VIsand Functions
Ways to find controls, VIs, and functions:• Search or navigate the palettes.
− Controls palette− Functions palette• Search by name of object.
− Quick Drop dialog box• Search palettes, LabVIEW Help, and ni.com.− Search text box in toolbar
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Controls Palette
• Contains the controls and indicators you use to create the front panel.• Navigate the
subpalettes or use the Search button to search the Controls palette.
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Functions Palette
• Contains the VIs, functions, and constants you use to create the block diagram.• Navigate the
subpalettes or use the Search button to search the Functions palette.
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Searching with Quick Drop
• Lets you quickly find controls, functions, VIs, and other items by name.• Press the <Ctrl-
Space> keys to display the Quick Drop dialog box.
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Global Search
Use the Search bar in the top right of the front panel and block diagram windows to search palettes, LabVIEW Help, and ni.com.
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DEMONSTRATION
Search for Controls, VIs and Functions
• Configure palettes to customize visible palettes.
• Search and navigate the palettes.• Search for help using global search.• Use Quick Drop to search by name.
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DISCUSSION
Group ExerciseConcept: Locating Controls, Functions and VIs
• Why would you want to add a function to the Favorites category in the Functions palette?• When to use the Quick Drop dialog box and when
to use the Search button on the Controls and Functions palettes?
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G. Selecting a Tool
Selecting a ToolBlock Diagram Clean-Up
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Selecting a Tool
• A tool is a special operating mode of the mouse cursor.
• Create, modify, and debug VIs using the tools provided by LabVIEW.
• By default, LabVIEW automatically selects tools based on the context of the cursor.
• If you need more control, use the Tools palette to select a specific tool.− Select View»Tools Palette to
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Wiring Tips • Press <Ctrl-B> to delete broken wires.• Right-click and select Clean Up Wire to
reroute the wire.
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Wiring Tips – Clean Up Diagram Use the Clean Up Diagram tool to reroute multiple wires and objects and to improve readability.
1. Select a section of your block diagram.2. Click the Clean Up Diagram button on the
block diagram toolbar (or press <Ctrl-U>).
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Cloning and Moving Items
• Clone an object in Windows using the following steps:1. Select the Positioning tool.2. Press the <Ctrl> key while clicking an object.3. Drag the copy to new location.• Move an object using the following steps:
1. Select the Positioning tool.2. Click and drag the object to new location.Note: Avoid cutting and pasting objects as this can impact related items. For example, cutting and pasting a block diagram terminal also moves the front panel object.
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DEMONSTRATION
Selecting, Editing, Resizing and Wiring
• Select item to move, copy, or delete• Edit text• Resize an object• Wire terminals and nodes• Automatic and manual tool selection
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DEMONSTRATION
Setting Options for the EnvironmentIn Tools»Options… dialog box you can customize settings for the LabVIEW environment.Suggested changes:– Front Panel page
• Set Control Style for New VIs to Silver style
– Block Diagram page • Uncheck Place front panel terminals as icons• Configure Block Diagram Cleanup to customize
your block diagram
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H. Dataflow
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Dataflow
LabVIEW follows a dataflow model for running VIs.• A node executes only when data are
available at all of its required input terminals.• A node supplies data to the output
terminals only when the node finishes execution.68
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Dataflow – Quiz
What are the nodes in this fragment of code?
Which node executes first?
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Dataflow – Quiz Answer
There are two nodes: „square” and „greater than?” functions.
Square executes first.
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Dataflow – Quiz
Which node executes first?
a) Addb) Subtractc) Random Numberd) Divide e) Sine
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Dataflow – Quiz Answer
No single correct answer.
Which node executes first? a) Add – Possiblyb) Subtract –
Definitely notc) Random Number –
Possiblyd) Divide – Possiblye) Sine – Definitely not
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Group ExerciseConcept: Dataflow
Identify dataflow execution order in the following block diagrams.
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Group ExerciseConcept: Dataflow
Which node executes first? Last?Where are the data dependencies?
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Which Express VI executes last?
Group ExerciseConcept: Dataflow
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Which Express VI executes last?
Group ExerciseConcept: Dataflow
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Which Tone Measurements Express VI executes last?
Group ExerciseConcept: Dataflow
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I. Building a Simple VI
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Building a Simple VI
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Acquire Express VIs
• DAQ Assistant Express VI
• Instrument I/O Assistant Express VI
• Simulate Signal Express VI
• Read from Measurement File Express VI
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Analyze Express VIs
• Amplitude and Level Measurements Express VI
• Statistics Express VI
• Spectral Measurements Express VI
• Tone Measurements Express VI
• Filter Express VI
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Present Express VIs and Indicators
• Display Message Express VI
• Play Waveform Express VI
• Report Express VI
• Write to Measurement File Express VI
• DIAdem Report Express VI
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Building and Running a VI
1. Place Express VI on the block diagram.
2. Configure the dialog box that opens.3. Wire Express VIs together.4. Save and run the VI.
The Run button appears broken when the VI you are creating or editing contains errors.
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Homework:Navigating LabVIEW
Practice navigating the LabVIEW environment - add things to the front panel and block diagram, align and resize objects, use simple functions.
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Homework:Simple AAP VI
Build a simple Acquire-Analyze-Present VI.
You may use some of the Express VIs mentioned on the slides or different VIs that can be found in LabVIEW palettes.
To find a function or VI, use ‘Search’ button on the palette or use Quick Drop window (<Ctrl+space>).
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Homework:Simple AAP VIExample: using Express VIs
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Homework:Simple AAP VIExample: without Express VIs
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Example – scenario:• Acquire a sine waveform for 0.1 seconds.• Determine the average value of the waveform.• Log the data to a file.• Display the data to a graph.
Homework:Simple AAP VI