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Chapter 4 Digital I/O Functionality
NI CVS-1450 Series User Manual 4-12 ni.com
Considerations When Connecting the Digital I/O
The isolated trigger inputs on the CVS-1450 device are current sinking
and optically isolated. Figure 4-6 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 4-5. Refer to Appendix B, Specifications, for switching
thresholds and current requirements.
Caution Do not apply a voltage greater than 30 VDC to the isolated inputs. Doing so could
damage CVS-1450 device.
Figure 4-5. Example of Connecting an Isolated Input to a Sourcing Output Device
Wiring an Isolated Output to an External Load
The digital output circuit sources current to external loads, as shown in
the example in Figure 4-6.
Caution Do not draw more than 100 mA from 24 V or 30 V isolated outputs. Do not draw
more than 50 mA from 5 V isolated outputs.
Vcc
Sourcing
Output
Device
Viso
Current
Limiter
Ciso
CVS-1450 device
Input