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Chapter 6
Counters
Pulse Train Generation
Refer to the following sections for more information about the cDAQ chassis pulse train
generation options:
•
Finite Pulse Train Generation
•
Retriggerable Pulse or Pulse Train Generation
•
Continuous Pulse Train Generation
•
Buffered Pulse Train Generation
•
Finite Implicit Buffered Pulse Train Generation
•
Continuous Buffered Implicit Pulse Train Generation
•
Finite Buffered Sample Clocked Pulse Train Generation
•
Continuous Buffered Sample Clocked Pulse Train Generation
Finite Pulse Train Generation
This function generates a train of pulses with programmable frequency and duty cycle for a
predetermined number of pulses. With cDAQ chassis counters, the primary counter generates
the specified pulse train and the embedded counter counts the pulses generated by the primary
counter. When the embedded counter reaches the specified tick count, it generates a trigger that
stops the primary counter generation.
Figure 6-28.
Finite Pulse Train Generation: Four Ticks Initial Delay, Four Pulses
Retriggerable Pulse or Pulse Train Generation
The counter can output a single pulse or multiple pulses in response to each pulse on a hardware
Start Trigger signal. The generated pulses appear on the Counter
n
Internal Output signal of the
counter.
You can route the Start Trigger signal to the Gate input of the counter. You can specify a delay
from the Start Trigger to the beginning of each pulse. You also can specify the pulse width.
The delay and pulse width are measured in terms of a number of active edges of the Source
input. The initial delay can be applied to only the first trigger or to all triggers using the
CO.EnableInitalDelayOnRetrigger
property. The default for a single pulse is True, while
the default for finite pulse trains is False.
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