Flow Ctrl Tech Engineering

Practical PID Loop Tuning for Industrial Process PLCs: Step Tests, Dead Time & Anti-Windup

Field engineer guide to tuning PID loops on temperature, pressure, and flow systems: calculating process dead time, applying Cohen-Coon parameters, and preventing integrator windup.

  • Derivative action (D) should never be applied to noisy flow or pressure loops; reserve it for lag-heavy temperature loops.
  • Always execute PID calculation blocks inside a fixed-time cyclic interrupt (e.g., OB35 at exactly 100ms).
  • Integral anti-windup prevents massive overshoot when manual override or physical valve limits are hit.

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