In modern CNC architectures, the main I/O board processes a set baseline of machine tool commands. When a complex machine requires additional inputs or outputs (such as extra tool changer sensors, safety interlocks, status indicators, or auxiliary fluid valves), the A03B-0823-C013 serves as a direct system expander.
It interfaces directly with the central CNC rack via FANUC’s proprietary, high-speed serial network communication protocol known as I/O Link.