The ABB INIIT03 is an Industrial Network Interface Termination Unit designed for use within ABB’s INFI-90, Symphony, and Harmony distributed control systems (DCS). This module plays a critical role in maintaining the integrity and reliability of the INFI-NET communication loop. It provides proper termination, electrical isolation, and convenient connection points for the network nodes. By ensuring stable and error-free data transmission between controllers and other system components, the INIIT03 is an essential component for robust and efficient industrial process control.