+5 V Power As An Input - National Instruments NI USB-621x User Manual

+5 V Power as an Input

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If you have high current loads for the digital outputs to drive, you can
exceed the 50 mA internal limit by connecting an external +5 V power
source to the +5 V terminals. These terminals are protected against
undervoltage and overvoltage, and they have a 350 mA self-resetting fuse
to protect them from short circuit conditions. If your USB-621x device has
more than one +5 V terminal, you can connect the external power supply to
one terminal and use the other as a power source.
3-3
Chapter 3 Connector Information
NI USB-621x User Manual