Product Overview

The ABB SPDSI22 is a high-density digital input interface designed for the Symphony Plus and Harmony rack Distributed Control Systems (DCS). Functioning as a 16-channel universal input module, it is engineered to capture discrete signals from field-level equipment—such as limit switches, relay contacts, and pushbuttons—and convert them into logic-level data for the controller. The SPDSI22 is a versatile successor within the INFI 90 lineage, offering enhanced signal detection speed and superior electromagnetic noise rejection. Its modular architecture allows it to fit seamlessly into standard Harmony racks, providing a reliable bridge for data acquisition in mission-critical utility and process automation environments.

Technical Specifications & Module Parameters

• Channel Count: 16 independent digital input channels

• Input Type: Universal discrete (supporting various voltage ranges via jumper configuration)

• On-Board Customization: Includes 32 jumpers for flexible signal tailoring per channel

• Physical Dimensions: 3.7cm x 31.3cm x 17.7cm

• Weight: 0.24 kg

• System Architecture: Compatible with Symphony Plus and legacy INFI 90 / Harmony systems

• Communication Integration: Supports data routing via Ethernet-based control networks

• Isolation: High-level galvanic isolation between field inputs and system logic

• Manufacturing Origin: Sweden

• Maintenance Features: Hot-swappable design for reduced mean time to repair (MTTR)

Industrial Automation Scenarios

The SPDSI22 module is specifically built for sectors requiring high availability and precise event sequencing. Typical deployment areas include:

• Power Generation: Monitoring auxiliary contacts of high-voltage circuit breakers and motor control center (MCC) statuses in thermal and hydro plants.

• Water Treatment Facilities: Capturing pump run/stop signals and level switch triggers across distributed lift stations.

• Process Manufacturing: Managing discrete feedback from valve positioners and safety interlocks in chemical or pharmaceutical production lines.

• Steam Turbine Control: Serving as the input interface for critical trip logic and operational sequence monitoring.

• Infrastructure Modernization: Acting as a direct, high-performance replacement for aging INFI 90 modules to improve system diagnostic capabilities without changing existing field wiring.