Reliance Electric B-60021 PMI Processor Module

The Reliance Electric 0-60021-1 PMI Processor Module is a compact, front-loading controller designed to plug into a Reliance Automax PMI Rack and serve as the PMI processor for the Power Module Interface system. Weighing approximately 1.10 pounds before packing, it features a front panel with meter ports, two communications links, and two rail ports, plus five LED indicators labeled OK, COMM OK, PM Flt, EXT Flt, and Rail Flt to convey status at a glance. In PMI rack configurations, the PMI Processor module coordinates control tasks and inter‑module communications across the rack, executing the core control algorithm and handling I/O and speed feedback data within the Automax distributed power system. This unit represents legacy Reliance Electric hardware and is now considered obsolete by the original manufacturer, though it remains relevant for repair, refurbishment, or compatibility in aging automation installations. Documentation and marketplace listings commonly refer to this family of PMI processors as 0-60021 (with variants such as 0-60021-1 through 0-60021-4), reflecting its central role in Reliance Electric drive architectures. When installed with the appropriate PMI rack and companion modules, the 0-60021-1 enables continued operation of legacy servo drives within established automation systems.