Справочник Пользователя для National Instruments NI 9474

the channel is in an overcurrent state, measure the voltage between 
DO and V

sup

. If the voltage is equal to the voltage of the external 

power supply connected to the module, the channel is in an 
overcurrent state.

After you have determined and fixed the cause of the overcurrent 
condition, reset the channel by turning it off. Alternatively, you can 
disconnect the external power supply from the module. However, 
doing so disconnects power from all of the module channels. 
Normal operation can resume after you correct the overcurrent 
condition and reset the channel.

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 

ni.com/info

 and enter 

cseriesdoc

 for information about 

C Series documentation.