Pfi - National Instruments DAQ X Series User Manual

PFI

X Series devices have up to 16 Programmable Function Interface (PFI)
signals. In addition, X Series devices have up to 32 lines of bidirectional
DIO signals.
Each PFI can be individually configured as the following:
•
•
•
•
Each PFI input also has a programmable debouncing filter. Figure 8-1
shows the circuitry of one PFI line. Each PFI line is similar.
Timing Signals
Static DO
Buffer
Static DI
To Input Timing
Signal Selectors
PFI
Change
Detection
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A static digital input
A static digital output
A timing input signal for AI, AO, DI, DO, or counter/timer functions
A timing output signal from AI, AO, DI, DO, or counter/timer
functions
Direction
Control
PFI
Filters
Figure 8-1. X Series PFI Circuitry
8-1
8
I/O Protection PFI x/P1/P2
Weak Pull-Down
X Series User Manual