Using Pfi Terminals As Timing Input Signals - National Instruments PXI-6238 User Manual

Chapter 8 PFI
Timing Signals
When a terminal is used as a timing input or output signal, it is called PFI x
(where x is an integer from 0 to 9). When a terminal is used as a static digital
input or output, it is called P0.x or P1.x.
The voltage input and output levels and the current drive levels of the PFI
signals are listed in the NI 6238/6239 Specifications.

Using PFI Terminals as Timing Input Signals

Use PFI <0..5> terminals to route external timing signals to many different
M Series functions. Each input PFI terminal can be routed to any of the
following signals.
•
•
•
•
•
•
•
•
•
•
•
Most functions allow you to configure the polarity of PFI inputs and
whether the input is edge or level sensitive.
NI 6238/6239 User Manual
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Static DO
Buffer
Figure 8-2. NI 6238/6239 PFI Output Circuitry
AI Convert Clock
AI Sample Clock
AI Start Trigger
AI Reference Trigger
AI Pause Trigger
AI Sample Clock Timebase
AO Start Trigger
AO Sample Clock
AO Sample Clock Timebase
AO Pause Trigger
Counter input signals for either counter—Source, Gate, Aux,
HW_Arm, A, B, Z
8-2
Isolation
Barrier
Digital
PFI <6..9>/P1.<0..3>
Isolators
ni.com