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DAQmx Trigger (Reference » Analog Edge) (G Dataflow)

Last Modified: September 18, 2017

Configures the task to stop the acquisition when the device acquires all pretrigger samples; an analog signal reaches the level you specify; and the device acquires all post-trigger samples.


task in

task in is the name of the task that the operation applies.



source is the name of a virtual channel or terminal where there is an analog signal to use as the source of the trigger.

For E Series devices, if you use a virtual channel, it must be the only channel in the task. The only terminal you can use for E Series devices is PFI0.



slope specifies on which slope of the signal the Reference Trigger occurs.

Name Description

Trigger when the signal crosses level on a falling slope.


Trigger when the signal crosses level on a rising slope.



level specifies at what threshold to trigger. Specify this value in the units of the measurement or generation. Use slope to specify on which slope to trigger at this threshold.


error in

error in describes error conditions that occur before this node runs. This input provides standard 'error in' functionality.


pretrigger samples per channel

pretrigger samples per channel specifies the minimum number of samples to acquire per channel before recognizing the Reference Trigger. The number of post-trigger samples per channel is equal to number of samples per channel in the DAQmx Timing node minus pretrigger samples per channel.


task out

task out is a reference to the task after this node runs.


error out

error out contains error information. If error in indicates that an error occurred before this node ran, error out contains the same error information. Otherwise, error out describes the error status that this node produces.

Where This Node Can Run:

Desktop OS: Windows

FPGA: LabVIEW NXG does not support FPGA devices

Web Server: Not supported in VIs that run in a web application

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