Allow Undefined Values Property

LabVIEW 2018 Help

Edition Date: March 2018
Part Number: 371361R-01
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Short Name: AllowUndefVals

Requires: Base Development System

Class: Ring Properties

To Use: Create a property.

If TRUE, users can enter numeric values not already associated with any entries in the list of items defined for a ring control. Users must enter undefined numeric values in the digital display of the control. If FALSE, users must select from the list of items defined for the control.

This property is similar to the Allow Undefined Values item on the shortcut menu of a ring control and the Allow undefined values at run time checkbox on the Edit Items page of the Ring Control Properties dialog box.


The following table lists the characteristics of this property.

Data type
Available in Run-Time EngineYes
Available in Real-Time Operating SystemYes
Settable when the VI is runningYes
Loads the front panel into memoryYes
Need to authenticate before useNo
Loads the block diagram into memoryNo
Remote access allowedYes


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