What the sampling speed buys you
The PXF9AER2-JVCA1: A 50 ms sampling period means the controller updates its control output every 50 ms — fast enough to catch thermal transients in processes like injection molding or extrusion, where a slower loop lets temperature overshoot past the setpoint before the controller reacts. The self-tuning algorithm adjusts PID parameters automatically during the first heat-up cycle, so you don't need to run a separate auto-tune procedure or guess the process time constant.