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CREATING SUBVIS FROM SECTIONS OF A VI in Modular Programming

You can convert a section of a VI into a subVI by using the positioning tool to select the section of the block diagram you want to reuse as shown in Figure 3.11. Then select Edit»Create SubVI as

Select a portion of the available VI to create a SubVI

shown in Figure 3.12 from the menu to convert the selected portion into a subVI. SubVI created with default icon is shown in Figure 3.13. An icon for the new subVI replaces the selected section of the block diagram. LabVIEW creates controls and indicators for the new subVI, automatically configures the connector pane based on the number of control and indicator terminals you selected, and wires the subVI to the existing wires.
Select Edit»Create SubVI to create subVI.

SubVI created with default icon

Creating a subVI from a selection is convenient but still requires careful planning to create a logical hierarchy of VIs. Consider which objects to include in the selection and avoid changing the functionality of the original or resulting VI. Creating a subVI from a selection is the same as removing the selected objects and replacing them with a subVI. In both situations, LabVIEW does not remove any of the front panel terminals included in the selection from the original VI. The front panel terminals remain on the front panel of the original VI and the terminals are wired to the new subVI. Also for each front panel object with a Property Node or local variable in the selection, LabVIEW adds a control reference to the original block diagram and wires the reference to the subVI. In the subVI, LabVIEW wires the reference to a Property Node. Select not more than 28 objects to create a subVI, because 28 is the maximum number of connections on a connector pane. You avoid creating cycles on the block diagram and including a structure that contains a front panel terminal in the selection.


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