Why Can't I Use DAQ Assistant Express VIs to Do 4 Counter Tasks?

Updated May 3, 2018

Reported In

Hardware

  • cDAQ-9178
  • NI-9411
  • NI-9401

Software

  • LabVIEW Full

Driver

  • NI-DAQmx

Issue Details

I am trying to read four counters from a 9411 on my 9178 chassis using four different DAQ Assistant Express VIs. When I use three DAQ Assistants it works fine but when I drop the fourth one it is gray and will not run. 

Solution

Your cDAQ has a limited number of timing engines and you are limited by using the DAQ Assistant Express VIs to the number of timing engines you have on board.
Consider using the DAQmx VIs to configure your tasks and their timing properties, and customize the source of the timing VIs in order to configure multiple tasks to one timing engine or access an external timing engine.

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