Generate Software Timed Trigger with NI-DAQmx in LabVIEW

Issue Details

• I have an NI hardware configuration and I want to use one digital or analog input signal to trigger a particular task or operation on my LabVIEW code.
• I want to synchronize two tasks to execute one after the other, and my NI hardware configuration does not have the physical channels to perform a hardware trigger.

Solution

A software-timed trigger can be implemented by continuously monitoring the status of an input signal within a while loop. When a specific condition is met—such as a threshold being crossed—the loop exits and the DAQmx Start.vi is called to initiate the desired task.

The following code snippet demonstrates how to create a software-timed trigger using an analog input. In this example, an analog voltage value from the DAQ Assistant is monitored, and once it exceeds a defined threshold, it triggers a separate DAQmx Analog Input Task.

Note: The DAQ Assistant VI can be substituted with a digital input task if your application requires digital triggering instead.

Block Diagram:

Note: This image is a LabVIEW snippet, which includes LabVIEW code that you can reuse in your project. To use a 
snippet, right-click the image, save it to your computer, and drag the file onto your LabVIEW diagram.

False Case:

Additional Information