The Beckhoff C1 Interface Cards series is designed to connect a host controller to the Beckhoff II/O-System, acting as the communication link between the host bus and a fiber-optic fieldbus ring.
These cards use dual-port memory for fast data exchange and provide separate areas for process data, configuration, testing, analysis, and signal-state control. Their communication structure is based on telegram-style data transfer with hardware-managed framing and addressing for up to 254 modules on the ring. The series also supports diagnostic functions such as module counting, address verification, ring reset, interruption detection, and light absorption testing within the fiber-optic network. Overall, the C1 series is built for distributed industrial I/O applications that require dependable host-to-fieldbus communication, organized diagnostics, and efficient signal handling.
