National Instruments NI 9475 - Manual (Page 11)

© National Instruments Corp. 11 NI 9475 Operating Instructions and Specifications
Higher inrush currents that exist for less than the trip time do not
trip the protection circuitry. Refer to the
Specifications section for
more information about the maximum continuous output current,
short-circuit behavior, and short-circuit trip time. You also can
refer to the IEC 1131-2 standard for more information about
short-circuit-proof devices.
Tip Because the NI 9475 includes internal flyback
diodes, you do not need to add external diodes when
connecting to switching energy storing devices.
Power Supplies and Overcurrent Conditions
If a short-circuit occurs, the current through DO can exceed the
current rating for the power supply and the maximum continuous
output current for the NI 9475.
If the power supply you are using with the NI 9475 cannot supply
more than 13 A, the module may be damaged if a short-circuit
condition occurs.
Detecting an Overcurrent Condition
If a device connected to the module is not working while the
channel is on, the module channel may be in an overcurrent state.
Neither the software nor the module LEDs indicate if an