Yokogawa Electric Corporation PW481 Power Module

The Yokogawa PW481 Power Module (Style S2) is an industrial power supply module engineered exclusively for Yokogawa CENTUM VP and FIO/FCU control systems, providing regulated internal power to CPU, I/O, and communications modules within DCS/PLC architectures. It accepts 100–120 VAC ±10%, 50/60 Hz, draws about 2.5 A (roughly 200 VA), and installs in a rack/base module across slots P1–P2, weighing about 1 kg. The PW481 supports dual-redundant configurations for high-reliability operation and is designed to feed internal power to FCU, FIO Node Units, and Optical ESB Bus Repeater Units via a dedicated backplane connector. Common replacements include PW482 (220–240 VAC version), PW484 (24 VDC version), and NFPW441 / NFPW444 for newer STARDOM systems. It is commonly deployed in chemical processing, power generation, manufacturing, and process automation environments to ensure stable operation of CPU, I/O, and communication modules and continuous plant uptime.