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When seeting the control gain of a PID controller, it allows me to type a negative gain; but it doesn't seem to respond properly. Is it really taking the negative number or it's just internally truncating to zero?
Which VI were you using? Which version of LabVIEW are you using?
With General PID Simulator.VI found in "C:\Program Files\National Instruments\LabVIEW 6\examples\pid\Prctrlex.llb" negative gains can be used (causing instability).
Regards,
Chad H. Application Engineer National Instruments http://www.ni.com/ask
