Error calculation is the step in a control system that computes the difference between a desired setpoint and the measured process variable. This error term is the input that drives corrective action in feedback controllers such as PID loops. Accurate, low-latency error calculation is essential for stable and responsive position, velocity, and other regulated control behaviours.
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- The error signal it produces feeds proportional, integral, and derivative terms that determine the controller output. Precision and timing of this computation directly govern loop stability, overshoot, and steady-state accuracy.