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OPERATING INSTRUCTIONS AND SPECIFICATIONS - page 11 / 24

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I/O Protection

The NI 9476 is protected against overcurrent, inrush, and short-circuit conditions in accordance with IEC 1131-2.

Understanding Protected Devices

Each channel on the NI 9476 has circuitry that protects it from voltage and current surges resulting from short circuits.

Caution The NI 9476 can be damaged under overvoltage and reverse bias voltage conditions. Check the voltage specifications for all devices that you connect to the NI 9476.

Excessive current through a DO pin causes the channel to go into an overcurrent state. In an overcurrent state, the channel cycles off and on until the short circuit is removed or the current returns to an acceptably low level. Refer the Specifications section for typical trip currents.

Each channel has a status line that indicates in software whether the channel is in an overcurrent state. Refer to the software help for information about reading output status.

© National Instruments Corp.

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NI 9476 Operating Instructions and Specifications

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