The Art of LabVIEW in TestStand - National Instrumentsaustralia.ni.com/sites/default/files/Art of...
Transcript of The Art of LabVIEW in TestStand - National Instrumentsaustralia.ni.com/sites/default/files/Art of...
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The Art of LabVIEW in TestStand
Rejwan Ali
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Agenda
• TestStand vs LabVIEW
• The Art
• Additional Resources
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Agenda
• TestStand vs LabVIEW
• The Art
• Additional Resources
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VSAND
TestStand vs LabVIEWTestStand AND LabVIEW
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TestStand AND LabVIEW
• LabVIEW is a development environment
• TestStand is a test executive
• LabVIEW could be used to build a test executive
• TestStand is an off-the-shelf test executive
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NI TestStand – Test Management Software
• Graphical development
environment
• Automate tests written in
10 different test languages
• Multithreaded sequence
execution
• ASCII, HTML/Web, XML,
and ATML report
generation
• Access, Oracle,
SQL Server database
connectivity
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NI TestStand – Test Management Software
• Full Featured and Simple User Interfaces are provided in NI
LabVIEW, NI LabWindows™/CVI, C#, C++, and VB.NET
• TestStand Deployment Utility builds a simple installer with
necessary dependencies
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TestStand AND LabVIEW
• Components of a
Test Executive
• LabVIEW
Compliments
TestStand
• Pick the Right
Tool for the Job
AND
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TestStand AND LabVIEW
• Components of a
Test Executive
• LabVIEW
Compliments
TestStand
• Pick the Right
Tool for the Job
• Layers of an automated test
Drivers
Test Executive
Programming Language/Script
Hardware Layer
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TestStand AND LabVIEW
• Components of a
Test Executive
• LabVIEW
Compliments
TestStand
• Pick the Right
Tool for the Job
• Using TestStand as your test
executive
Drivers
TestStand
Code Modules
Hardware Layer
LabVIEW CVI VC++ .NET
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TestStand AND LabVIEW
• Components of a
Test Executive
• LabVIEW
Compliments
TestStand
• Pick the Right
Tool for the Job
• Components of a test executive
Test Executive
Drivers
Code Modules
Hardware Layer
User
Interface
Result
Collection
Report
Generation
Database
Logging
Tools/
UtilitiesTest Flow
User MgmtTest
SequenceEngine
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TestStand AND LabVIEW
• Components of a
Test Executive
• LabVIEW
Compliments
TestStand
• Pick the Right
Tool for the Job
• Components that can be customized with LabVIEW
Test Executive
Drivers
Code Modules
Hardware Layer
User
Interface
Result
Collection
Report
Generation
Database
Logging
Tools/
UtilitiesTest Flow
User MgmtTest
SequenceEngine
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TestStand AND LabVIEW
• Components of a
Test Executive
• LabVIEW
Compliments
TestStand
• Pick the Right
Tool for the Job
How do I know if TestStand is the right
tool?
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TestStand AND LabVIEW
• Components of a
Test Executive
• LabVIEW
Compliments
TestStand
• Pick the Right
Tool for the Job
Key Words:
• Volume Production Test
• User Management
• Parallel/Multi-head Test
• Report Generation
• Database Logging
• Product Family
• Multi-Developer Environment
• Framework
• Phased Approach
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TestStand AND LabVIEW
• Components of a
Test Executive
• LabVIEW
Compliments
TestStand
• Pick the Right
Tool for the Job
Scenario 1-
“We want to test 15 UUTs in a temperature chamber
at the same time AND simultaneously. If certain
people log in to the test they need to be able to
debug the UUTs.”
• Batch/Parallel Testing
• User Management
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TestStand AND LabVIEW
• Components of a
Test Executive
• LabVIEW
Compliments
TestStand
• Pick the Right
Tool for the Job
Scenario 2-
“We want to be able to do extensive
troubleshooting of our contraption. We only
make 2 contraptions per year”
• Not production but could tests be reused by
production?
• Low Volume
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TestStand AND LabVIEW
• Components of a
Test Executive
• LabVIEW
Compliments
TestStand
• Pick the Right
Tool for the Job
Other considerations:
• Are there multiple groups making
similar tests in the company?
• Can I meet my customer’s deadline?
• Will this grow over time?
• Training costs? Both on in house test
executive and COTS test executive
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TestStand AND LabVIEW
• Components of a
Test Executive
• LabVIEW
Compliments
TestStand
• Pick the Right
Tool for the Job
• Summary:
• LabVIEW and TestStand can be
used together to create a fully
automated test
• Choosing the right tool for the right
job can save you time and money
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Agenda
• TestStand AND LabVIEW
• The Art
• Additional Resources
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The Art
• Drawing the Line
• Examples
• Making the Right
Choice
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The Art
• Because some functionality in
TestStand and LabVIEW overlap it is
an art to know which tool to use for
which task
• Does it make sense to keep this
functionality in TestStand
• Does it make sense to push this
functionality to LabVIEW
• Drawing the Line
• Examples
• Making the Right
Choice
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The Art Chart
Native Functions/Operators
TS Datatypes
Limit Evaluation
Result Collection
Locking
Synchronization
API
Looping
Database Com.
FTP
Popups
Executables
Options Loading
Limit Loading
Hardware Communication
Data Display
Advanced Math
Network Communication
User Event Driven
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The Art Chart
Native Functions/Operators
TS Datatypes
Limit Evaluation
Result Collection
Locking
Synchronization
API
Looping
Database Com.
FTP
Popups
Executables
Options Loading
Limit Loading
Hardware Communication
Data Display
Advanced Math
Network Communication
User Event Driven
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The Art
• Native Functions/Operators
• For Instance:
Generate a random number
between 1000 and 2000
• Drawing the Line
• Examples
• Making the Right
Choice
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The Art
• Native Functions/Operators
• TestStand:
• LabVIEW:
• Drawing the Line
• Examples
• Making the Right
Choice
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The Art
• Native Functions/Operators
• Using native functions eliminates code
modules
• However, some advanced functions
may not exist in TestStand but are
available in LabVIEW
• (e.g. Reverse 1D Array)
• Drawing the Line
• Examples
• Making the Right
Choice
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The Art Chart
Native Functions/Operators
TS Datatypes
Limit Evaluation
Result Collection
Locking
Synchronization
API
Looping
Database Com.
FTP
Popups
Executables
Options Loading
Limit Loading
Hardware Communication
Data Display
Advanced Math
Network Communication
User Event Driven
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The Art
• Hardware Communication
• Communicate with Instruments and
UUT
• For Instance:
Set a current limit on a power supply
• Drawing the Line
• Examples
• Making the Right
Choice
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The Art
• Hardware Communication
• TestStand:
• Need a code module
• LabVIEW:
• Drawing the Line
• Examples
• Making the Right
Choice
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The Art
• Hardware Communication
• TestStand cannot directly call drivers
without a code module
• Drawing the Line
• Examples
• Making the Right
Choice
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The Art Chart
Native Functions/Operators
TS Datatypes
Limit Evaluation
Result Collection
Locking
Synchronization
TestStand API
Looping
Database Com.
FTP
Popups
Executables
Options Loading
Limit Loading
Hardware Communication
Data Display
Advanced Math
Network Communication
User Event Driven
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The Art
• API Calls
• For Instance:
Programmatically returning the result
of a specific step by name
• Drawing the Line
• Examples
• Making the Right
Choice
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The Art
• API Calls
• TestStand:
• LabVIEW:
• Drawing the Line
• Examples
• Making the Right
Choice
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The Art
• Example: API Calls
• Simpler in TestStand
• Unnecessary code module
• Do not need to close refs
• However, one must use API in
LabVIEW when creating a standalone
TS application (such as a custom UI)
• Drawing the Line
• Examples
• Making the Right
Choice
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The Art Chart
Native Functions/Operators
TS Datatypes
Limit Evaluation
Result Collection
Locking
Synchronization
API
Looping
Database Com.
FTP
Popups
Executables
Options Loading
Limit Loading
Hardware Communication
Data Display
Advanced Math
Network Communication
Data Analysis
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The Art
• Shared Functionality
• How complex is it in LabVIEW?
• How complex is it in TestStand?
• Can I reuse it in a LabVIEW only app?
• Do I already have something?
• What are my company’s standards?
• Which is easier to maintain?
• What is the performance?
• Drawing the Line
• Examples
• Making the Right
Choice
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The Art
• Making the Right Choice• Drawing the Line
• Examples
• Making the Right
Choice
LabVIEW TestStand
Pros:
• Faster
• More Flexible
• Lower Level Access
Pros:
• Garbage Cleanup
• Less Code (maintain)
• Direct API Access
• More readable
Cons:
• More Code
- Deployment
- Maintenance
• Close References
Cons:
• Less Flexible
• Step Action Overhead
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Agenda
• TestStand AND LabVIEW
• Most Common Mistakes
• Additional Resources
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Additional Resources
• I’m still hungry for information?
• UsingLabVIEWLabWindowsCVIwithTestStand.pdf
• Located on the web and on disk:
<TestStand>\Doc\Manuals
• Key topics:
• Using LabVIEW Data Types
with TestStand
• Effectively Using LabVIEW with
TestStand
• Using LabVIEW
with TestStand
• Advanced
Architecture
Series
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The Art
• I’m still hungry for information?
• Advanced Architecture Series
• http://www.ni.com/white-paper/7022/en/
• Key topics:
• Best Practices for Code Module Development – Ray Farmer
• NI TestStand Type Management Best Practices
– Santiago Delgado
• Using LabVIEW
with TestStand
• Advanced
Architecture
Series
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Agenda
• TestStand AND LabVIEW
• The Art
• Additional Resources