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The interface circuit is the same for the forward limits, reverse limits, and home inputs. As shown in
Figure 24, you can wire a sourcing output device, such as a PNP sensor, to the limit or home inputs. You
can use the isolated power (V
to power the limit home sensor.
PNP
(Sourcing)
Output Device
Viso
V+
Out
V–
Ciso
Figure 24. UMI-7774/72 Optically Isolated Sinking Input Interface Circuit and Connection to
You can also connect the limit and home inputs to a high-side switch. Figure 25 shows an example of
wiring the limit or home input to a high-side switch.
Viso
High-Side
Limit Switch
Digital
Input
Ciso
Figure 25. UMI-7774-7772 Optically Isolated Sinking Input Interface Circuit and Connection to
NI UMI-7774/72 User Guide and Specifications
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
) and isolated common (C
iso
Input
Out
Current Limiter
UMI-7774/72
Sourcing Output Sensor
Current Limiter
UMI-7774/72
High-Side Switch
26
) signals provided on the control connector
iso
Vcc
Vcc
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