ABB NAOM01 Analog Output Module for Bailey INFI 90 / Symphony DCS Systems

Description

Product Overview

The ABB NAOM01 is a high-precision analog output module designed for the Bailey INFI 90, Symphony, and Network 90 distributed control systems (DCS), representing a cornerstone of ABB’s legacy process automation portfolio . This module serves as the critical interface between the DCS controller and field-based final control elements, converting digital control signals into standardized analog outputs that drive valves, variable frequency drives, positioners, and recording instruments with exceptional accuracy and stability . The ABB NAOM01 , often identified by its assembly part number 6631966D1, integrates seamlessly into the Symphony / INFI 90 I/O rack architecture, drawing its logic power from the system backplane and communicating directly with the master controller via the system bus .

Available in configurations supporting either 4 or 8 independent, software-configurable output channels, the ABB NAOM01 offers field-selectable output types including 4–20 mA, 0–20 mA, 0–10 V, and ±10 V, making it an exceptionally versatile solution for diverse process control requirements . Each channel is electrically isolated from the system backplane and from other channels, withstanding test voltages up to 1500 V AC, a feature critical for maintaining signal integrity and protecting sensitive control electronics in electrically noisy industrial environments . The ABB NAOM01 delivers a typical accuracy of ±0.1% of full scale at 25°C with a 12-bit DAC resolution, ensuring that control signals are transmitted with the precision demanded by applications such as flow control, pressure regulation, and temperature management .

Although the ABB NAOM01 has been discontinued by the original manufacturer, it remains a widely-sought spare part for maintaining and supporting the thousands of INFI 90, Network 90, and Symphony systems still in operation worldwide across power generation, oil and gas, and heavy process industries . The ABB NAOM01 continues to be available through aftermarket channels as new-old-stock or tested refurbished units, enabling plants to extend the life of their legacy automation infrastructure while planning systematic migrations to newer platforms.

Technical Specifications