NI 9475 Operating Instructions and Specifications 10 ni.com
I/O Protection
The NI 9475 is short-circuit proof in accordance with IEC1131-2
and provides overcurrent protection.

Understanding Short-Circuit-Proof Devices

Each channel on the NI 9475 has circuitry that protects it from
current surges resulting from short circuits. Whether the module
suffers damage from these overcurrent conditions depends on the
following factors:
• The amount of current through the channel
• The amount of time the current is above the current limit
• The frequency of the current surges
When the amount of current through the DO pin is greater than
13A, the channel trips and goes into an overcurrent state. In an
overcurrent state, the channel turns off and the module is not
damaged. If the current through DO is between 6 A and 13 A, the
state of the channel is indeterminate and depends on factors such
as the current level, the temperature, and the power supply.