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Chapter 4 Digital I/O Functionality
© National Instruments Corporation 4-7 NI 1450 Series Compact Vision System User Manual
Figure 4-4 shows a rising edge trigger and a low pulse with a quadrature
encoder delay and a microsecond width.
Figure 4-4. Rising Edge Trigger, Low Pulse with a Quadrature Encoder Delay
Product Selection Port
The product selection port consists of a group of five isolated digital inputs
that the software running on the NI 1450 reads simultaneously. You can
program the NI 1450 to switch between up to 32 (2
5
) inspection sequences
for different parts on an assembly line.
Based on the input to the product selection port, you can configure the
application software to run the appropriate inspection sequence. For
example, an upstream NI 1450 programmed for part classification might
drive the product selection port of a downstream NI 1450. Alternatively,
a PLC with information about which part is being inspected can drive the
product selection port of the NI 1450.
Using ISO Input 5 as a Latch
You can configure the product selection port to use ISO Input 5 as a latch.
A rising edge on ISO Input 5 can latch the data into a data register on the
NI 1450. Before each inspection, the software checks the status of the
product select inputs and reads the most recent value latched into the
register.
Note In Vision Builder AI, ISO Input 5 is always designated as a latch.
Phase A
Phase B
Delay Width
Trigger
Low Pulse