Symphony Plus Analog Input Module

The ABB IMASI23 is a 16-channel universal analog input module designed for the Symphony Plus / Harmony Rack I/O system (the evolution of the Bailey INFI 90 DCS platform). It serves as the critical data acquisition front-end, converting field analog signals—including thermocouples, RTDs, millivolt, and high-level current/voltage signals—into digital data for the controller. 

The ABB SPFEC12 is a 15-channel analog input module designed for the Symphony Plus S+ HR I/O (Harmony Rack) series, serving as the standard analog signal acquisition card for Bailey INFI 90 / Net 90 distributed control systems (DCS). It converts field analog signals (4–20 mA current or 1–5 V voltage) into digital data for the controller, providing the critical front-end data acquisition layer for process control in power generation, petrochemical, and heavy industry applications.