The ABB SPNPM22 is a Network Processing Module (NPM) for the Symphony Plus HR Series (Harmony Rack) and legacy Bailey INFI 90 distributed control systems (DCS). It serves as the central communication gateway between the high-speed INFI-NET plant network (Cnet) and the local ControlWay I/O bus, managing token passing, exception reporting, and time distribution across the control system.
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