Controller class and sampling rate
The PXF4APA2-FV1A1 is a 1/16 DIN (48 x 48 mm panel cutout) self-tuning temperature and process controller with a 50 ms sampling speed, meaning it updates its control output every 50 milliseconds. That sampling rate puts it in the mid-speed range for thermal processes — fast enough for most extruder zones, packaging seal bars, and reflow ovens, but not intended for sub-cycle power control on a 50/60 Hz line where you'd want faster than 10 ms.