What this controller is and what the 50 ms sampling means for your loop
The Fuji PXF4ABA2-FVMA1 is a self-tuning 1/16 DIN (48 x 48mm) compact temperature and process controller with a 50ms sampling speed. That 50 ms sampling rate means it reads the process variable and updates the control output every 50 milliseconds.
The 1/16 DIN (48 x 48mm) panel cutout is the standard small-controller footprint — fits the same hole as every other 1/16 DIN controller on the market, so it drops into an existing panel cutout without rework. The compact depth leaves room behind the panel for wiring and optional communications modules.