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You can mimic a static write to a PFI line by using DAQmx routing. Use the DAQmx Connect Terminal VI to route an internal logic high or low to one of the PFI lines. Be sure to disconnect the route when you are done, otherwise you will not be able to export other signals to that PFI line, or use it as a trigger. I've included a small LV 7.1 VI as an example.