Справочник Пользователя для National Instruments NI 1450 Series

Table 4-3 lists the product selection ports.

General-purpose inputs are available as both TTL and isolated inputs. 
At any time, the software running on the NI 1450 can read these 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 1450 system 
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.

General-purpose outputs are also available as both TTL and isolated 
outputs. At any time, the software running on the NI 1450 can drive these 
outputs high or low.

The primary difference between general-purpose outputs and timed pulse 
outputs is that the timing of general-purpose outputs is controlled by 
software rather than hardware. As a result, timing of general-purpose 
outputs changes as the inspection algorithm changes, which makes 
general-purpose outputs less appropriate than timed outputs for camera 
control, strobe light control, and other applications that require precise 
timing.

Table 4-3.  Product Selection Port

Data(5), rising edge latch

 ISO Input 5

Data(4)

 ISO Input 4

Data(3)

 ISO Input 3

Data(2)

 ISO Input 2

Data(1)

 ISO Input 1

Data(0)

 ISO Input 0