Chapter 3
Digital I/O Functionality
NI CVS-1450 Series User Manual
3-12
ni.com
Overheat
Operating the NI CVS-1450 device outside of its temperature
specifications may cause the NI CVS-1450 device to overheat. Refer to
the
Specifications
section of
Getting Started with the NI CVS-1450 Series
Compact Vision System
for temperature specifications.
In the event of an overheat, all NI CVS-1450 device operation halts and the
POWER OK
LED turns red. If shutdown mode is enabled, the outputs
go to the user-defined shutdown states.
Considerations When Connecting the Digital I/O
The isolated trigger inputs on the NI CVS-1450 device are current sinking
and optically isolated. Figure 3-5 shows the trigger input interface circuit.
Wiring an Isolated Input to a Sourcing Output Device
You can wire an isolated input to a sourcing output device, as shown in
the example in Figure 3-5. Refer to the
Specifications
section of
Getting
Started with the NI CVS-1450 Series Compact Vision System
for switching
thresholds and current requirements.
Caution
Do
not
apply a voltage greater than 30 VDC to the isolated inputs. Doing so could
damage NI CVS-1450 device.
Figure 3-5.
Example of Connecting an Isolated Input to a Sourcing Output Device
V
cc
Sourcing
Output
Device
V
iso
Current
Limiter
C
iso
NI CVS-1450 device
Input
