Counter Output:General Properties:More:Advanced:Constrained Generation Mode Property

DAQmx - Data Acquisition VIs and Functions

Edition Date: January 2019

Part Number: 370469AP-01

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Short Name: CO.ConstrainedGenMode

Property of DAQmx Channel

Specifies constraints to apply when the counter generates pulses. Constraining the counter reduces the device resources required for counter operation. Constraining the counter can also allow additional analog or counter tasks on the device to run concurrently. For continuous counter tasks, NI-DAQmx consumes no device resources when the counter is constrained. For finite counter tasks, resource use increases with the frequency regardless of the constraint mode. However, fixed frequency constraints significantly reduce resource usage, and fixed duty cycle constraint marginally reduces it.

Unconstrained (14708) Counter has no restrictions on pulse generation.
Fixed High Frequency (14709) Pulse frequency must be above 7.63 Hz and cannot change while the task runs. In this mode, the duty cycle has 8 bits of resolution.
Fixed Low Frequency (14710) Pulse frequency must be below 366.21 Hz and cannot change while the task runs. In this mode, the duty cycle has 16 bits of resolution.
Fixed 50 Percent Duty Cycle (14711) Pulse duty cycle must be 50 percent. The frequency can change while the task runs.


The following table lists the characteristics of this property.

Settable while task is runningdevice-specific
Available in Run-Time Engineyes


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