National Instruments NI 9472 - Manual (Page 11)

© National Instruments Corp. 11 NI 9472/9474
You can directly connect the NI 9472/9474 to a variety of industrial
devices such as solenoids, motors, actuators, relays, and lamps.
Make sure the devices you connect to the NI 9472/9474 are
compatible with the output specifications of the module. Refer to
the
Specifications section for more information about the output
specifications.
Connect the device to DO and connect the common of the device
to COM. Refer to Figure 3 for an illustration of how to connect a
device to the NI 9472/9474.
Figure 3. Connecting a Device to the NI 9472/9474
External
Power
Supply
NI 9472/9474
+
_
COM
V
sup
Device
DO