Description

The IMASI23 (ASI23) is a high‑density universal analog input submodule for legacy ABB Bailey INFI 90 / Symphony DCS. It acquires field sensor signals, performs linearization, cold‑junction compensation and engineering‑unit conversion locally on‑board, then transmits data to the controller via the I/O Expander Bus. Widely deployed in power, pulp & paper, petrochemical and boiler control systems.

Technical Specifications

• Brand: ABB (Bailey)
• Model: IMASI23
• Warranty: One Year
• Condition: 100% New & Original
• Channels: 16 independent, galvanically isolated AI
• Supported signals: Thermocouple (TC), RTD, mV, 4–20 mA, 0–10 V, ±10 V
• ADC: 24‑bit delta‑sigma converter per channel
• Accuracy: ±0.1% FS
• Isolation: 2500 VAC channel‑to‑channel, channel‑to‑backplane
• Cold junction: Built‑in CJC for thermocouple
• Bus: I/O Expander Bus to INFI90 controller
• Hot swap: Yes
• Termination: Matched Bailey TU termination unit / cable harness
• Operating temp: 0 °C to +60 °C
• Diagnostics: Front status LEDs, wire break, out‑of‑range, self‑test

Differentiation

• IMASI23: Older Harmony rack universal AI
• SPASI23: Direct form/fit/function newer replacement revision
• IMASI03 / IMASI13: Earlier generation predecessors
• IMASO11 / SPASO11: Analog output sibling module
• Origin: USA / Malta
• Certifications: CE, cULus
• Lifecycle: Original production discontinued; only aftermarket / surplus tested spare, configuration needs matching function block settings