NI SMD-7613/7614/7615/7616 User Manual
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© National Instruments
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21
Figure 24.
Connecting a PNP Type Proximity Sensor to an Input
Connecting Limit Switches and Sensors
The CWLIMIT and CCWLIMIT differential inputs can be used to connect end of travel sensors.
You can use signals that are sinking (NPN), sourcing (PNP) or differential (line driver). By
connecting switches or sensors that are triggered by the motion of the motor or load, you can
force the motor to operate within certain limits, preventing damage to your system by traveling
too far.
The limit inputs are optically isolated, allowing you to choose a voltage for your limit circuits of
12 to 24 VDC. This also allows you to have long wires on limit sensors that may be far from the
drive with less risk of introducing noise to the drive electronics.
Refer to the following diagrams for help connecting limit switches and sensors:
Figure 25.
Wiring a Mechanical Limit Switch
12-24 VDC
Power
Su
pply
-
+
XCOM
X
3
..X6
O
u
tp
u
t
+
PNP
Proximity
S
en
s
or
-
Drive
Drive
12-24 VDC
Power
Su
pply
+
–
CCWLIMIT–
CWLIMIT–
C
