week 3 - labview student ambassadors_v1

8/19/2019 Week 3 - LabVIEW Student Ambassadors_v1

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Course Learning Map

Lesson 3

Implementing a VI

Lesson 2

Troubleshooting &Debugging VIs

Lesson 1

Naigating LabVI!"

Lesson #

Managing $ile an% ar%'are(esources

Lesson )

Creating an% LeeragingData *tructures

Lesson +

Deeloping Mo%ular,pplications

Lesson -

*oling Datalo' Challenges 'ith Variables

Lesson

0sing *euential an% *tateMachine ,lgorithms

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Lesson 3

Implementing a VI

A. Front Panel Basics

B. LabVIEW Data Types

C. Documenting Code

D. Wile Loops

E. For Loops

F. Timing a VI

!. Data Feedbac" in Loops

#. Plotting Data $ Wa%e&orm Cart

I. Case 'tructures

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!. $or Loops

Conditional TerminalComparison (it Wile Loops

)umeric Con%ersion &or Count Terminal

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$or Loops

LabVIEW For Loop Flo(cart Pseudo Code

N41556

i456

0ntil i4N7

(epeat 8co%e6i4i91:6

!n%6

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$or Loops

• Create a For Loop te same (ay you create a Wile Loop.

• *ou can replace a Wile Loop (it a For Loop by rigt+

clic"ing te border o& te Wile Loop and selecting

(eplace 'ith $or Loop &rom te sortcut menu.• Te %alue in te count terminal ,an input terminal-

indicates o( many times to repeat te subdiagram

in te For Loop.

)


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$or Loops ; Con%itional Terminal

*ou can add a conditional terminal to con&igure a For Loop tostop (en a Boolean condition is true or an error occurs.

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$or Loops ; Con%itional Terminal

For Loops con&igured (it a conditional terminal a%e• A red glyp ne/t to te count terminal.

• A conditional terminal in te lo(er rigt corner


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$or Loop/"hile Loop Comparison

$or Loop• E/ecutes a set number o& times

unless a conditional terminal is

added.

•

Can e/ecute 0ero times.• Tunnels automatically output an

array o& data.

"hile Loop• 'tops e/ecuting only i& te %alue

at te conditional terminal meets

te condition.

•

1ust e/ecute at least once.• Tunnels automatically output te

last %alue.

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$or Loops ; Numeric Conersion• Te number o& iterations a For Loop e/ecutes must be speci&ied in

non+negati%e integers.

• I& you (ire a double+precision2 &loating+point numeric %alue to te

count terminal2 LabVIEW con%erts te numeric %alue to a 34+bit signed

integer.

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$or loop an% 'hile loop in%e=ing

comparison 8N!" *LID!:

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>roup !=ercise 3?3

Concept7 "hile Loops ersus $or Loops

5nderstand (en to use a Wile Loop and (en to use a For

Loop.


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$. Timing a VI

6easons To 5se TimingWait Functions and E/press VIs

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Timing a VI

Wy do you need timing in a VI7

• To control te &re8uency at (ic a loop e/ecutes.

• To pro%ide te processor (it time to complete oter tas"s2

suc as processing te user inter&ace.

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"ait $unctions

A (ait &unction inside a loop• Allo(s te VI to sleep &or a set amount o& time.

• Allo(s te processor to address oter tas"s during te (ait

time.

• 5ses te operating system millisecond cloc".

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!lapse% Time !=press VI

•

Determines o( muc time elapses a&ter some point inyour VI.

• 9eeps trac" o& time (ile te VI continues to e/ecute.

• Does not pro%ide te processor (it

time to complete oter tas"s.

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D!MN*T(,TIN

"ait Chart VI

Compare and contrast using a Wait &unction and te Elapsed

Time E/press VI &or so&t(are timing.


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>. Data $ee%bac@ in Loops

'i&t 6egistersInitiali0ing 'i&t 6egisters

De&ault &or 5n(ired Values

Compound 'i&t 6egisters

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Data $ee%bac@ in Loops

•

Wen programming (it loops2 you o&ten need to "no( te%alues o& data &rom pre%ious iterations o& te loop.

• 'i&t registers trans&er %alues &rom one loop iteration to te

ne/t.

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*hit (egisters

•

6igt+clic" te border and select ,%% *hit (egister &romte sortcut menu.

• 6igt si&t register stores data on completion o& an iteration.

• Le&t si&t register pro%ides stored data at beginning o& te

ne/t iteration.

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Bloc" Diagram :st run 4nd run

Initiali0ed'i&t

6egister

;utput < = ;utput < =

)ot

Initiali0ed'i&t6egister

;utput < > ;utput < ?

InitialiAing *hit (egistersVI inishes (un again(un once

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0se Deault i 0n'ire%

De&ault %alues %ary by data type

5ninitiali0ed si&t registers use de&ault %alues &or &irst run.

Data TBpe Deault Value

)umeric @

Boolean FAL'E

'tring Empty

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!=ercise 3?+

,erage Temperature VI

M!"(

5se a Wile Loop and si&t registers to a%erage data.


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DI*C0**IN

!=ercise 3?+

,erage Temperature VI

*ou calculated te a%erage o& te last = temperature readings.#o( (ould you modi&y te VI to calculate te a%erage o& te

last :@ temperature readings7


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. lotting Data ; "aeorm Chart

2)


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lotting Data ; "aeorm Chart

•

Wa%e&orm cartis a special type

o& numeric

indicator.

• Wa%e&orm carts

display single or

multiple plots.

2#


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"aeorm Chart roperties

E/tensi%e plotcustomi0ation lets you

• 'o( or ide legends.

• Cange color and line

styles.• Cange interpolation

styles.

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!=ercise 3?)

Temperature Monitor VI ; lot Multiple Temperatures

M!"(

Plot multiple data sets on a single (a%e&orm cart and

customi0e te cart %ie(.


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DI*C0**IN

!=ercise 3?)

Temperature Monitor VI ; lot Multiple Temperatures

In (at (ays do te &ollo(ing tools allo( te user to interact (it te plot7

• Plot Legend

• !rap Palette

• 'cale Legend


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I. Case *tructures

Parts o& a Case 'tructureEnum Case 'tructures

Error Case 'tructures

Input and ;utput Tunnels

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Case *tructures

•

#a%e t(o or more subdiagrams or cases.• 5se an input %alue to determine (ic case to e/ecute.

• E/ecute and display only one case at a time.

• Are similar to case statements or i...then...else statements

in te/t+based programming languages.

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Case *tructures

Case *elector Label

*elector Terminal

• Case 'elector Label

Contains te name o& te current

case.

#as decrement and increment

arro(s.

• 'elector Terminal

Lets you (ire an input %alue2 or

selector2 to determine (ic case

e/ecutes.

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Case *tructures

'elector terminal data types

• Boolean

True case and False Case

• Error Cluster

Error Case and )o Error Case

• Integer2 string2 or enum

'tructure can a%e any

number o& cases.

Include a De&ault diagram to

a%oid listing e%ery possible

input %alue.

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!num Case *tructure

• !i%es users a list o& items &rom (ic to select

• Te case selector displays a case &or eac item in te

enumerated type control

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*hortcut Menu

5se te sortcut menu o& aCase structure to Customi0e te structure and

diagrams.

6emo%e or replace testructure.

Add2 duplicate2 remo%e2 or

rearrange cases.

'peci&y te De&ault case.

'(itc cases.

3)


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!rror Case *tructure

5se Case structures inside VIs to e/ecute te code i& tere is

no error and s"ip te code i& tere is an error.

3#


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Input an% utput Tunnels

*ou can create multiple input and output tunnels.

• Inputs tunnels are a%ailable to all cases i& needed.

• *ou must de&ine eac output tunnel &or eac case.

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Case *tructures

• Create case structures using di&&erent data type selectors.

• Add2 remo%e2 and duplicate cases.

• Create di&&erent type o& output tunnels.


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!=ercise 3?#

Temperature "arnings VI

M!"(

1odi&y a VI to use Case structures to ma"e a so&t(are

decision.


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!=ercise 3?#

Temperature "arnings VI

• Wat appens i& all te %alues are :@7 #o( could you &i/

tis7• Are all output tunnels de&ined7 Wat appens i& an output

is not de&ined7


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*ummarBEuiA

:. I& an input to a &unction is mar"ed (it a red dot ,"no(n as

a coercion dot-2 (at does te dot indicate7

a- Data (as trans&erred into a structure.

b- A For Loop (as con&igured (it a conditional terminal.

c- A For Loop iteration terminal is un(ired.

d- Te %alue passed into a node (as con%erted to a

di&&erent representation.

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*ummarBEuiA ,ns'er

:. I& an input to a &unction is mar"ed (it a red dot ,"no(n as

a coercion dot-2 (at does te dot indicate7

a- Data (as trans&erred into a structure.

b- A For Loop (as con&igured (it a conditional terminal.

c- A For Loop iteration terminal is un(ired.

%: The alue passe% into a no%e 'as conerte% to a

%ierent representation.

+2


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*ummarBEuiA

4. Wic structure must run at least one time7

a- Wile Loop

b- For Loop

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*ummarBEuiA ,ns'er

4. Wic structure must run at least one time7

a: "hile Loop

b- For Loop

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*ummarBEuiA

3. Wic is only a%ailable on te bloc" diagram7

a- Control

b- Constant

c- Indicatord- Connector Pane

+)


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*ummarBEuiA ,ns'er

3. Wic is only a%ailable on te bloc" diagram7

a- Control

b: Constant

c- Indicatord- Connector Pane

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*ummarBEuiA

>. Wic mecanical action causes a Boolean control in te

FAL'E state to cange to T65E (en you clic" it and stay

T65E until LabVIEW as read te %alue7

a- '(itc 5ntil 6eleasedb- '(itc Wen 6eleased

c- Latc 5ntil 6eleased

d- Latc Wen 6eleased

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*ummarBEuiA ,ns'er

>. Wic mecanical action causes a Boolean control in te

FAL'E state to cange to T65E (en you clic" it and stay

T65E until LabVIEW as read te %alue7

a- '(itc 5ntil 6eleasedb- '(itc Wen 6eleased

c- Latc 5ntil 6eleased

%: Latch "hen (elease%

+-


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week 3 - labview student ambassadors_v1

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