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HELP! I have a problem with my NI 6112 card about pwm output frequencies

  today,I open simulink and start working . I try to adjust the pwm frequencies to 1hz , in the duty cycle mode. but which turn out to fail.  yes the least frequency  it works is 4.5hz,but I need it to be lower for my devices. but as though I worked hard,but it just won't work,which frustrates me a lot...

  this is reason that simulink give.

 

 

Error occurred while executing External Mode MEX-file 'quarc_comm':ExtSetTargetPkt() call failed on STOP.Ensure target is still running



Error occurred while executing External Mode MEX-file 'quarc_comm':DAQmx failed to output the requested PWM values.

 

and I sweer ,1hz is definitely between the range of maximum and minimum.

please help!!!!!!

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