What this controller carries
The PXF5ABY2-FW100 is a Micro-Controller X with a 2-point alarm output and a single relay SPDT control output. The second control output slot is unpopulated — Y = None — so this variant gives you one dry-contact relay for on/off or alarm annunciation, plus two alarm points for pre-alarm or deviation thresholds. Revision code 2 tracks the firmware or hardware iteration.
The 5.8 cm x 4.8 cm x 9.6 cm footprint fits standard panel cutouts for this controller family. The relay SPDT output (Control Output 1) switches up to the rated contact load — verify the load type (resistive vs inductive) against the relay's AC/DC rating before wiring. The two alarm outputs are solid-state or relay depending on the option code; F = 2 points means both are populated.