Increasing Current Drive
Each channel has a continuous output current of 250 mA. If you want to increase the output current to a device, you can connect any number of channels together in parallel. For example, if you want to drive 1 A of current, connect DO<0..3> in parallel as shown in Figure 3. You must turn all parallel channels on and off simultaneously so that the current on any single channel cannot exceed the 250 mA rating.
Figure 3. Increasing the Current to a Device Connected to the NI 9476
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NI 9476 Operating Instructions and Specifications