NI cDAQ-9178 - Page 54

NI cDAQ-9178/9174 User Guide and Specifications 54 ni.com
Figure 48 shows a generation of two pulses with a pulse delay of five and a pulse width of three (using
the rising edge of Source) with CO.EnableInitalDelayOnRetrigger set to the default True.
Figure 48. Retriggerable Single Pulse Generation with Initial Delay on Retrigger
Figure 49 shows the same pulse train with CO.EnableInitalDelayOnRetrigger set to the default False.
Figure 49. Retriggerable Single Pulse Generation False
Note The minimum time between the trigger and the first active edge is two ticks of the source.
For information about connecting counter signals, refer to the Default Counter/Timer Routing section.
Continuous Pulse Train Generation
This function generates a train of pulses with programmable frequency and duty cycle. The pulses
appear on the Counter n Internal Output signal of the counter.
You can specify a delay from when the counter is armed to the beginning of the pulse train. The delay
is measured in terms of a number of active edges of the Source input.
You specify the high and low pulse widths of the output signal. The pulse widths are also measured in
terms of a number of active edges of the Source input. You also can specify the active edge of the Source
input (rising or falling).
The counter can begin the pulse train generation as soon as the counter is armed, or in response to a
hardware Start Trigger. You can route the Start Trigger to the Gate input of the counter.
You also can use the Gate input of the counter as a Pause Trigger (if it is not used as a Start Trigger).
The counter pauses pulse generation when the Pause Trigger is active.
SOURCE
GATE
(Start Trigger)
OUT
5 3 5 3
Counter
Load Values
4 3 210210 43 210210
SOURCE
GATE
(Start Trigger)
OUT
5 3 2 3
Counter
Load Values
4 3 210210 43 210210