National Instruments NI 9403 User Manual download pdf (Page 9)

Overcurrent/Short-Circuit Protection

The overcurrent protection allows only a specified amount of

current through the output channels to protect the NI 9403 from

short circuits. If the NI 9403 goes into an overcurrent state, the

module sets all the DIO channels to high impedance for

approximately 280 milliseconds. When the channels are in this

state, the NI 9403 can accept new line direction configuration and

output state data but cannot pass valid input data to the software.

After the protection period, the NI 9403 automatically recovers to

the latest direction configuration and output state. If the

overcurrent condition still exists, the module again sets the

channels to high impedance. This cycle continues until the

overcurrent condition is removed. Refer to the Specifications

section for more information about the maximum output current.

Sleep Mode

This module supports a low-power sleep mode. Support for sleep

mode at the system level depends on the chassis that the module is

plugged into. Refer to the chassis manual for information about

support for sleep mode. If the chassis supports sleep mode, refer to

the software help for information about enabling sleep mode. Visit

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National Instruments NI 9403 User Manual Page 9