Symphony Plus’s Harmony and Melody I/O families provide migration paths for legacy Bailey and MOD 300 systems, protecting prior capital investment. The system’s System 800xA-compatible operator interface delivers unified process, electrical, and safety management on a single workstation. ABB Ability’s cloud platform ingests Symphony Plus historian data to feed AI-driven anomaly detection, reducing unplanned turbine and boiler downtime. Built-in IEC 61850 GOOSE messaging integrates substation protection relays natively. Redundant CPUs and power supplies deliver 99.999% control availability.