LabView instrumentoinnissa, 55492, 3opLabview in instrumentation

• Lecturer: Heikki Ojala, heikki.ojala@helsinki.fi, room C204a Physicum

• Teaching assistant: Hannu Koskenvaara, hannu.koskenvaara@helsinki.fi, room B436 Chemicum

• Course webpage: http://electronics.physics.helsinki.fi/?page_id=679• Time: Monday&Wednesday 12-14• Place:

– Lectures in D104 on 7.11., 9.11., 16.11., 23.11., 28.11., 30.11.– Excercises in D210 on 2.11., 14.11., 21.11., 5.12., 7.12., 12.12., 14.12.

• Material: Lecture notes Supporting material: Learning with LabVIEW 8 (Robert H. Bishop)

• Exam: Monday 19.12.

Course contents

1. Labview basics– virtual instruments, data flow, palettes

2. Structures– for, while, case, ...– editing techniques

3. Controls&Indicators– arrays, clusters, charts, graphs

4. Modular programming + recording– SubVIs– File I/O

5. Analysis– Linear algebra, Signal processing, Mathscript

6. Communication between loops– Producer/Consumer, State Machine, Local variables

7. Instrument control– DAQ, GPIB, Serial, Data collection

LabVIEW (Laboratory Virtual Instrument Engineering Workbench)

• Graphical programming language– icons instead of text– dataflow programming

• Virtual Instruments (VI)– measure, control, analyze, and store data– look like physical instruments– three main components:

• front panel, block diagram, icon and connector

Each VI has 2 Windows

Front Panel• User Interface (UI)

– Controls = Inputs– Indicators = Outputs

Block Diagram• Graphical Code

– Data travels on wires from controls through functions to indicators

– Blocks execute by Dataflow– Execution elements (functions,

structures, subVIs,...) are called nodes

LabVIEW Programs Are Called Virtual Instruments (VIs)

Front panel and the associated block diagram

Icon and connector

• specify the pathways for data to flow into and out of Vis– connect VIs to other VIs

connectoricon

Run Button

Continuous Run Button

Abort Execution

Execution Highlighting Button

Additional Buttons on the Block Diagram Toolbar

Front panel Toolbar

Retain Wire Values Button

Step Function Buttons

Controls Palette(Controls & Indicators)

(Place items on the Front Panel Window)

Indicator:Numeric Slide

Control:Numeric

Customize Palette View

Functions (and Structures) Palette

(Place items on the Block Diagram Window)

Structure:While Loop

Context Help Window• Help»Show Context Help, press the <Ctrl+H>

keys• Hover cursor over object to update windowAdditional Help

–Right-Click on the VI icon and choose Help, or

–Choose “Detailed Help.” on the context help window

Labview Help

Help>>Find Examples

File>>New (from template)

More help & resources

• NI.com– active forums with professional help

• Block diagram execution– Dependent on the flow of data– Block diagram does NOT execute

left to right• Node executes when data is

available to ALL input terminals

• Nodes supply data to all output terminals when done

Dataflow Programming

Example: DataflowA.vi, DataflowB.vi

Keynotes

Keynotes