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Alarming:RateOfChange:Ack Type Property

LabVIEW 2013 Help

Edition Date: June 2013

Part Number: 371361K-01

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Short Name: Alarming.ROC.AckType

Requires: Base Development System

Class: Variable Properties

To Use: Create a property.

Gets or sets how the Rate of Change alarm for a shared variable is acknowledged. To use this property, you must install the LabVIEW Datalogging and Supervisory Control Module.

Note  You can enable alarming only for network-published shared variables.

This property is similar to the Ack Type option on the Alarming page of the Shared Variable Properties dialog box.


0Auto (default)—indicates that LabVIEW acknowledges the alarm when the shared variable value returns to a normal state.
1User—indicates that LabVIEW does not acknowledge the alarm until you acknowledge the alarm, regardless of the alarm state.
2None—is obsolete.
3Each Occurrence—indicates that LabVIEW does not acknowledge the alarm until you acknowledge the alarm. LabVIEW generates a new alarm instance whenever the alarm changes from a normal state to an abnormal state.

If you specify Each Occurrence for this property, LabVIEW may generate a large number of alarm instances before you acknowledge them.


The following table lists the characteristics of this property.

Data type
Available in Run-Time EngineNo
Available in Real-Time Operating SystemNo
Settable when the VI is runningYes
Loads the front panel into memoryNo
Need to authenticate before useNo
Loads the block diagram into memoryNo
Remote access allowedYes
Must wait until user interface is idleNo
Available with control VIsNo
Available with global VIsNo
Available with strict type definitionsNo
Available with polymorphic VIsNo


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