21. For switching power supplies, the primary source of regulation error is switching ripple, rather than control loop precision. 22. A positive control loop tends towards instability as player-software loop strives towards a higher standard of desirable performance. 23. "' Loop performance "'indicates the performance of control loops , typically in the context of a regulatory PID loop. 24. It may be related to cybernetics as it involves a negative feedback control loop , or to systems theory. 25. In a secondary, implicit control loop the computer system adapts to its user improving its usability in general. 26. PLCs may include logic for single-variable feedback analog control loop , a proportional, integral, derivative ( PID ) controller. 27. Compact controllers in high-end equipment are available with touchscreen and graphical representation of the control loop or the system. 28. Information Technology ( IT ) plays now a central role in making management control loops more efficient and effective. 29. In the figure there are three feedback loops : current control loop, velocity control loop and position control loop . 30. In the nominal, i . e . fault-free situation, the lower control loop operates to meet the control goals.
