Daughter card for Summer + Intergral and Summer + Proportional + Integeral. Cards (6624150A1, 6624151A1, and 6624151J2C).
The Bailey 820 6624141F1C is a legacy industrial automation card, part of Summer + Proportional + Integral (SPI) controller card. It is part of the vintage Bailey 820 Control System line, which featured a split architecture designed heavily in the 1970s for modulating control in large power stations and boiler management system