ABB Ability Symphony Plus · HR Series ABB NTAI05 Analog Input Termination Unit A field-side termination point for 15 analog input signals connected to the SPFEC analog input module. This page brings the part identity, signal path, HART extension option and practical replacement checks into one purchasing view. 15 Field input signalsSignal path to SPFEC TypeAnalog Input Termination Unit Signals15 field inputs Companion ModuleSPFEC analog input module SystemSymphony Plus HR