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Chapter 1 Getting Started with the cDAQ Chassis
• Independent Data Streams—The NI 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 NI 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 NI 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 NI cDAQ-9178 chassis. Refer to Chapter 5, Counters, for more information.
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