LabVIEW and VirtualInstrumentation

in the Design Flow

Design Flow Cycle: Overlap of Design& Test

Modeling

Prototyping

CodeGeneration

Design Test

Calibration &Functional Test

Specification

Unit Test (Hardware-in-

The-Loop)

V Diagram – Specification

•Specify requirements of the system

Unit External Environment

V Diagram – Modeling andPrototyping• Create a model and prototype of the unit

• Tools:

– Simulation software

– Real-time system with I/O

Prototype of Unit External Environment

Simulation Interface Toolkit

• Use LabVIEW and Simulink® together forPrototyping and Hardware-in-the-LoopTesting

• Two components:1.Model interface

– Run Simulink® model in LabVIEW

2.User interface– LabVIEW-based user interface (sinks and sources)

in Simulink®

Simulation Interface ToolkitCreate Model in Simulink®

LabVIEW-based sink in Simulink®

Run Model in LabVIEW

Control Toolset

• PID Control Toolkit

• Fuzzy Logic Toolkit

• Advanced Control Tools

– Continuous linear (e.g. transfer function, integral, derivative)

– Discrete linear (e.g. discrete transfer function, unit delay)

– Nonlinear (e.g. 2D look-up table, backlash, saturation)

• Ships with the LabVIEW Real-Time Module

• Available for LabVIEW for Windows

• Model the simulated suspension system:

• Differential equation:

• Transfer function:

Vehicle Suspension Example

)()(

)()()(

2

2

tkudttdu

btkxdttdx

bdt

txdm +=++

kbsms

kbs

sU

sXsH

+++==

2)(

)()(

Vehicle Suspension Model inLabVIEW

Real-Time with I/O: LabVIEW Real-Time

•LabVIEW Graphicalenvironment

•Deterministicperformance (based ona real-time kernel)

•Built-in tools for controlsystems

What is MATRIXx?

Xmath

SystemBuild

DocumentIt

RealSim

AutoCode

Other

Softwareimplementation

Documentation

Hardware integrationand test

Analysisand design

Modelingand simulation

fftfreqpolynomial

x=Ax+Buy=Cx+Du

•

InterLeaf

Framemaker

HTML

MicrosoftWord

Processor 3

Processor 2

Task 1

Task 2

Task 3

Rea

l-ti

me

sch

edu

ler

I/O d

rive

rs

Hardware Systems

M

oore’s Law

Real-Time PXI PerformanceP

erfo

rman

ce

1999

PXI-8176 RT40 kHz cycle times

2000 2001 2002 2003 2004 2005

Leveraging CommercialTechnology in Real-Time

System

Need for Measurements in theDesign Flow

• Compare theoretical models with real-world data

• Detect design flaws earlier in the processwith measurements

PXI Real-Time Components• I/O connectivity

– Data Acquisition– Signal Conditioning– Dynamic Signal Acquisition– Motion Control– Image Acquisition

• Communication protocols– Ethernet– Serial– CAN– GPIB

• 3rd party connectivity with NI-VISA– Reflective Memory, MIL-STD-1553, Telemetry/IRIG B

• Chassis expansion through MXI-3

NetworkModule

FieldPoint Real-Time ComponentsIndustrial

I/O Modules

LabVIEW FPGA and PXI-7831R ReconfigurableI/O Board

8 A/D

8 D/A16 DIO

40 DIO

40 DIO

MITE

PXI / PCI Bus

68-pin VHDCI cable

68-pin VHDCI cable

68-pin VHDCI cable

FPGA(Xilinx

Virtex-II)

• 8 independent 16-bit Analog Inputs (A/Ds), 200 kS/s (5 µsec conversion)• 8 independent 16-bit Analog Outputs (D/As), 500 kS/s (2 µsec conversion)• 96 DIO Lines• 1M gate FPGA

Connectivity options

LabVIEW FPGA is ideal for:

• Parallel Tasks for Acquisition and Analysis– Parallelism is inherent in LabVIEW block diagram

approach

– Parallel tasks are clocked through the FPGAsimultaneously:

• Flexible I/O– Logic to modify DIO lines to counters, encoders, PWM

• Resource synchronization and timing– Precise timing of onboard resources including Analog I/O,

Digital I/O

Note: There is no operating system

V Diagram – Code Generation•Generate code for target processor fromvalidated control algorithms. Coding may bedone by hand or by using automatic codegeneration tools.

•Tools–Code generation

–I/O to verify code

Code Generation

LabVIEW Integration with TI DSP/CodeComposer Studio®

• Solves complexity of developing tests for DSPsystems�Complexity has delayed validation until after product

prototypes

• Now create tests during design modeling�Access DSP memory with TI’s RTDX interface

�Example:� Generate data set in LabVIEW and send it to the DSP memory

� Execute a test including real world I/O

� Read the DSP memory to LabVIEW and analyze it

Integrated Development and TestSoftware

CodeComposer

Studio®

DSP

Real-world stimuli

Real-world measurements

Download, debug

LabVIEW

RTDX

Calibration

LabVIEW Inside…

…TektronixOscilloscopes

V Diagram – Unit Test (Hardware-in-the-Loop)•Validate unit with a simulated environment

•Tools–Real-time system with I/O

–Simulation Software

Simulated EnvironmentActual Unit

V Diagram – Calibration &Functional Test• Test the integrated system• Tools

LabVIEW, CVI/Measurement Studio, TestStand, DIAdem,DAQ, FieldPoint, Signal Conditioning, Instruments, IMAQ,MotionPXI, PCI, PCMCIA, GPIB, Serial, CAN

Actual Unit External Environment

Application Examples• Automotive

– Powertrain control– Hybrid electric vehicles

• Aerospace, Defense– Flight control systems– Vehicle simulators– Gun turret control

• Biomedical– Muscle stimulators

• Electronics– Printer paper feeders

Other LabVIEW Initiatives• Increase functionality and work with companies indesign areas

LabVIEWEDA Embedded

Design

ControlDesign

Math

MCAD

Virtual Instrumentation and OpenSystems•NI has been part of expanding open systems

– GPIB, VXI, and PXI

– Now with the Design Flow

Combining our developments with others

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