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Chapter 3
Digital I/O Functionality
Note
In Vision Builder AI, ISO Input 5 is always designated as a latch.
NI CVS-1450 Series User Manual
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 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.
Table 3-3 lists the product selection ports.
Function
Data(5), rising edge latch
Data(4)
Data(3)
Data(2)
Data(1)
Data(0)
General-Purpose I/O
General-purpose inputs and outputs are available as both TTL and isolated
connections. At any time, the software running on the NI CVS-1450 device
can read the inputs and drive the outputs high or low.
General-Purpose Inputs
The primary difference between general-purpose inputs and trigger inputs
is that you cannot use general-purpose inputs to initiate a timed pulse
generator. In an application, use the general-purpose inputs to get the status
of the inputs at a given point and not to synchronize the NI CVS-1450
device with an external event.
An example of how to use general-purpose inputs is reading the status of
a general-purpose input as the first step in your inspection sequence and
recording that value as part of your inspection.
Table 3-3. Product Selection Port
3-8
External Connection
ISO Input 5
ISO Input 4
ISO Input 3
ISO Input 2
ISO Input 1
ISO Input 0
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