The ABB CI810 is an AF100 Fieldbus Communication Interface (FCI) module designed for the S800 I/O system. It serves as a crucial link, enabling seamless communication between the S800 I/O station and an Advant Controller 400 Series over the high-speed AF100 fieldbus. This module is engineered for reliability and performance in demanding industrial automation environments. The CI810 can be configured for redundant operation, significantly increasing system availability and fault tolerance. It supports up to 12 I/O modules per interface and can be mounted directly on a DIN rail, simplifying installation and system expansion within an ABB Advant OCS or System 800xA architecture.