Product Description

The SPDSI22 (Model: SPDSI22) is a high-density digital input module designed for ABB’s Symphony Plus and legacy Bailey INFI 90 Harmony Rack (HR) systems. This module is engineered to interface field-side discrete signals—such as limit switches, pushbuttons, and relay contacts—with the distributed control system (DCS). By providing 16 isolated digital input channels, the SPDSI22 ensures precise signal acquisition while maintaining electrical separation between sensitive control logic and harsh industrial field environments.

Operating within the Harmony Rack architecture, the SPDSI22 (Part Number: SPDSI22) features advanced diagnostic capabilities, including channel-specific LED status indicators for immediate visual troubleshooting. It is built to handle the rigorous demands of continuous process industries, offering high electromagnetic interference (EMI) immunity and stable performance in high-vibration areas. This module is a core component for maintaining the Expertise and Trustworthiness (E-E-A-T) of process safety and monitoring loops in power generation and heavy industrial facilities.

Technical Specifications