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© National Instruments Corporation 8-1 NI 6238/6239 User Manual
8
PFI
NI 6238/6239 devices have 10 Programmable Function Interface (PFI)
signals—six input signals and four output signals.
Each PFI <0..5>/P0.<0..5> can be configured as a timing input signal for
AI or counter/timer functions or a static digital input. Each PFI input also
has a programmable debouncing filter.
Caution When making measurements, take into account the minimum pulse width and
time delay of the digital input and output lines.
Figure 8-1 shows the circuitry of one PFI input line. Each PFI line is
similar.
Figure 8-1. NI 6238/6239 PFI Input Circuitry
Each PFI <6..9>/P1.<0..3> can be configured as a timing output signal
from AI, AO, or counter/timer functions or a static digital output.
Figure 8-2 shows the circuitry of one PFI output line. Each PFI line is
similar.
To Input Timing
Signal Selectors
Isolation
Barrier
Digital
Isolators
PFI <0..5>/P0.<0..5>
PFI
Filters
Static DI