National Instruments NI CVS-1450 Series - Manual (Page 55)

Chapter 4 Digital I/O Functionality
© National Instruments Corporation 4-7 NI CVS-1450 Series 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 CVS-1450 device reads simultaneously.
You can program the CVS-1450 device 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 CVS-1450 device programmed for part classification
might drive the product selection port of a downstream CVS-1450 device.
Alternatively, a PLC with information about which part is being inspected
can drive the product selection port of the CVS-1450 device.
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
CVS-1450 device. 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