Chapter 4
Digital I/O Functionality
NI 1450 Series Compact Vision System User Manual
4-6
ni.com
Figure 4-2.
High Pulse with Rising Edge Trigger
Figure 4-3 shows how to create a high and low pulse train with a
microsecond delay and width.
Figure 4-3.
High and Low Pulse Trains
Quadrature Encoder
The quadrature encoder uses ISO Input 6 for its Phase A input and
ISO Input 7 for its Phase B input. Encoder speed is limited by the speed of
the isolated inputs. Each isolated input can change at a maximum rate of
100 kHz, making the maximum encoder rate 400,000 counts/s.
The quadrature encoder can also be used as a timebase for the pulse
generation delay.
Trigger
Pulse
Delay
Width
Low Pulse Train
High Pulse Train
Delay
Width
Width
Delay
Software
Start
