The ABB SPDSI22 is a robust digital input module designed for the ABB Symphony Plus S+ Control system. This module provides 16 channels, organized into two isolated groups of eight, for interfacing with 24 VDC field signals. It is engineered to reliably monitor the status of digital field devices such as switches, push-buttons, and proximity sensors in demanding industrial environments. The SPDSI22 features sinking inputs and robust isolation between channel groups and the system, ensuring high signal integrity and protection against electrical noise. As part of the SD Series I/O, it integrates seamlessly into control applications, offering reliable data acquisition for process automation and control.