How do I control a servo-valve to open and close with Dasylab?

[schase]

I am currently using a servo-valve to run an endurance test and would like to control it to open a close  at a set frequency rate and set pressure rate (6000psi). Is there a controller that I can use to do that?  I am using Dasylab with a NI Daq board and I get the pressure and flow readings from the analog to digital signals correctly but to actually control a servo which is powered with and external power supply to provide 25VDC.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

[TomRizzo]

It would be unwise to use DASYLAb to close a loop on a servovalve.

The best way to do that would be to buy a analog PID controller board, MOOG and Parker sells those, and use an anaqlog output from the NI card to controll it.

We did many tests using this way.

There are also other option like servo-controllers that could perform many tasks, like FG, conditioning, limits, and profiles and then use DASYLAb for Data acquisition.

The price for this solution would be of course higher.