User Guide

NI cDAQ-9172 User Guide and Specifications 40 ni.com
PFI
You can configure channels of a correlated digital module in slots 5 and 6
as Programmable Function Interface (PFI) terminals.
You can configure each PFI individually as the following:
• Static digital input
• Static digital output
• Timing input signal for AI, AO, DI, DO, or counter/timer functions
• Timing output signal from AI, AO, DI, DO, or counter/timer functions
Each PFI input also has a programmable digital filter circuit that is
configurable on a per-line basis. The filters allow the rejection of noise
caused by noisy environments, bounces on switches, and so on. Refer to the
NI-DAQmx Help for more information. The NI-DAQmx Help is available
after installation from Start»All Programs»National Instruments»
NI-DAQ»NI-DAQmx Help.
Counters
The NI cDAQ-9172 chassis has two general-purpose 32-bit counter/timers
and one frequency generator, as shown in Figure 15. The general-purpose
counter/timers can be used for many measurement and pulse generation
applications.
Some counter/timer signals may be routed to PFI signals. To access
PFI signals, you must use a correlated digital I/O C Series module in
slot 5 and/or 6.
Note For more information about C Series signal connections for counters, refer to
the NI-DAQmx Help. The NI-DAQmx Help is available after installation from Start»
All Programs»National Instruments»NI-DAQ»NI-DAQmx Help.