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Chapter 9

Creating VIs

© National Instruments Corporation

9-19

Opening, Operating, and Changing SubVIs

You can open a VI used as a subVI from the block diagram of the calling 
VI by double-clicking on the subVI icon or by selecting Project»This VI’s 
SubVIs. You will see a palette containing all the subVIs of the calling VI. 
Select the subVI you want to open.

Any changes you make to a subVI alter only the version in memory until 
you save the subVI. The changes affect all instances of the subVI and not 
just the node you used to edit the VI.

Activity 9-4. Call a SubVI

Temp & Vol.vi

The Temp & Vol VI you built in Activity 9-1 returns a temperature and 
volume. You will take a volume reading and convert the value to gallons 
when a switch is pressed.

Front Panel

1.

Open a new front panel by selecting File»New.

2.

Select a Horizontal Switch from the Controls»Boolean palette and 
label it 

volume

. Place free labels on the front panel to indicate 

Liters

 

and 

Gallons

 by using the Labeling tool.

3.

Select a meter from Controls»Numeric and place it on the front panel. 
Label it 

Tank Volume

. 

4.

Change the range of the meter to accommodate values ranging 
between 0.0 and 1000.0. With the Operating tool, double-click on the 
high limit and change it from 10.0 to 1000.0. Switch to the positioning 
tool and resize the meter by dragging out one of the corners and 
expanding the control.