Chapter 4
Signal Connections
4-20
ni.com
Figure 4-16.
Limit, Home, Inhibit-In (Alarm), In-Position, and General-Purpose Input
Circuit Connected to a Low-Side Switch
Caution
Excessive input voltages can cause erroneous operation and/or component
failure. Verify that your input voltage is within the specification range.
The input active state of these signals is software programmable for active
open or active closed. Active open refers to a state where the current is not
flowing between the input signal and Axis <1..4> VI_COM. Active closed
refers to a state where the current is flowing between the input signal and
Axis <1..4> VI_COM.
Optocoupler
V
cc
R
LIMIT
PCI-7390
Axis <1..4> Input
Axis <1..4> VI_COM
Isolated
Ground
+24 V
Low-Side
Switch
