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NI SMD-7613/7614/7615/7616 User Manual
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© National Instruments
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19
Figure 19.
Connecting to the controller with Sinking (NPN) Outputs
Figure 20.
Using Mechanical Switches at 24 Volts
Single Ended Inputs
The SMD-761x includes four single ended, optically isolated input circuits that can be used with
sourcing or sinking signals. These inputs can be used with controllers, sensors, relays, or
mechanical switches. These inputs require an external power supply.
Note
COM, or common, refers to a connection to a common voltage. This is often
ground, but not always.If using sourcing (PNP) signals, connect COM to the negative
terminal of the power supply. When using sinking (NPN) signals, connect COM to
the positive terminal of the power supply.
761x
X1/
S
TEP+
X2/DIR–
X2/DIR+
X1/
S
TEP–
PLC
with
S
inking
O
u
tp
u
t
s
DIR
+12-24V
S
TEP
Direction
S
witch
R
u
n/
S
top
S
witch
(clo
s
ed=r
u
n)
+24 VDC
Power
Su
pply
+
–
Drive
X1/
S
TEP+
X2/DIR–
X2/DIR+
X1/
S
TEP–