© National Instruments | 1-17
NI cDAQ-9171/9174/9178 User Manual
• Independent Data Streams—The cDAQ-9171 supports six independent high-speed data
streams, which allow for up to six simultaneous hardware-timed tasks, such as analog input,
analog output, buffered counter/timers, and hardware-timed digital input/output.
The cDAQ-9174/9178 supports seven independent high-speed data streams, which allow
for up to seven simultaneous hardware-timed tasks, such as analog input, analog output,
buffered counter/timers, and hardware-timed digital input/output.
• PFI Signals—The PFI signals provide access to advanced features such as triggering,
synchronization, and counter/timers. You can also enable a programmable debouncing
filter on each PFI signal that, when enabled, samples the input on each rising edge of a filter
clock. PFI signals are available through parallel digital input and output modules installed
in up to two chassis slots and through the two PFI terminals provided on the cDAQ-9178
chassis. Refer to the PFI section of Chapter 4, Digital Input/Output and PFI, for more
information.
• Flexible Counter/Timers—The cDAQ chassis includes four general-purpose 32-bit
counter/timers that can be used to count edges, measure pulse-widths, measure periods
and frequencies, and perform position measurements (encoding). In addition, the
counter/timers can generate pulses, pulse trains, and square waves with adjustable
frequencies. You can access the counter inputs and outputs using parallel digital I/O
modules installed in up to two slots, or by using the two chassis PFI terminals provided on
the cDAQ-9178 chassis. Refer to Chapter 5, Counters, for more information.
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