NPIM01 Processor Interface Module for OIU (Operator Interface Unit).
The Bailey NPIM01 (or ABB NPIM01, part number 663I996KI) is a Processor Interface Module. It functions as a Network Interface Slave Module within the legacy Bailey INFI-90 and Network 90 distributed control systems (DCS). It serves as a key communication interface between the control system and operator interface units (OIU).