A trigger is a signal that causes an action, such as starting or stopping the acquisition of data. When you configure a trigger, you must decide how you want to produce the trigger and the action you want the trigger to cause. The cRIO controller supports internal software triggering, external digital triggering, analog triggering, and internal time triggering.
Three triggers are available: Start Trigger, Reference Trigger, and Pause Trigger. An analog or digital trigger can initiate these three trigger actions. C Series parallel digital input modules and the controller’s integrated PFI trigger line can be used in any controller slot to supply a digital trigger. To find your module triggering options, refer to the documentation included with your C Series modules. For more information about using analog modules for triggering, refer to the Analog Input Triggering Signal and Analog Output Triggering Signals sections.