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The FIO (Fieldnetwork I/O) System is connected to the Field Control Unit (FCU) via an ESB, optical ESB, or ER bus. The Field Control Unit (AFV30/AFV40) is connected to an ESB Bus Node Unit (ANB10) or an Optical ESB Bus Node Unit (ANB11). The Field Control Unit (AFV10) is connected to an ESB Bus Node Unit (ANB10) or an ER Bus Node Unit (ANR10). A node unit consists of a power supply module, a bus interface module, and input/output modules that are installed in a base unit. The power supply module, bus interface module, and input/output modules can be configured redundantly. The Unit for Optical ESB Bus Repeater Module (ANT10U) can be used to connect the optical ESB bus in a chain or star configuration. The following shows a system configuration example.