NI 9472/9474 12 ni.com
Increasing Current Drive
Each channel of the NI 9472 has a continuous output current of
0.75A, and each channel of the NI 9474 has a continuous output
current of 1A. If you want to increase the o utput current to a
device, you can connect any number of channels together in
parallel. For example, using the NI9474, if you want to drive 4 A
of current, connect DO<0...3> in parallel as shown inFigure 4.
You must turn all parallel channels on and off simultaneously so
that the current on any single channel cannot exceed the 1A rating.
Figure 4. Increasing the Current to a Device Connected to the NI 9474
NI 9474
DO3
DO1
DO0
DO2
4 A
+
_
COM
1 A
1 A
1 A
1 A
External
Power
Supply
Device
V
sup