The ABB 57360001‑HC DSMC112 is a legacy floppy disk controller board for ABB Advant Master DCS automation systems. It realizes floppy‑disk data read‑write, program backup and configuration file import‑export functions for old‑generation control cabinets. Adopting industrial euro‑card circuit architecture, it matches cabinet backplane bus and completes data interaction with main processor units. Built‑in surge suppression and signal filtering circuits adapt to harsh workshop environments of thermal power, chemical and pulp‑paper industries. Standard rack‑mount plug‑in structure supports convenient on‑site replacement to reduce unplanned downtime. As a scarce discontinued spare part for legacy DCS cabinets, each unit passes comprehensive aging and function testing before shipment for equipment overhaul and spare‑parts stocking.