As any error in your SQL will cause an exit, not just a credential problem, you'll loop around when you don't want to, as you noted in a comment.

Contrasted with the feedback loop this method is more accurate, the timing error is caught faster, the time resource is not necessary and it does not occupy resources of the hardware in DSP.

Stepper motor control can be used as a special motor, do not use their accumulated error (accuracy of 100%) the characteristics of a wide range of open-loop control.