National Instruments BridgeVIEW Activity 9-4. Call a SubVI

Chapter 9 Creating VIs

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

Your objective is to build a VI that uses the Temp & Vol.vi as a subVI.

The Temp& Vol VI you built in Activity9-1 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.