Plug-in board for the upstream Systevo Control to manage a maximum of 127 active system components in the corridor data bus, such as room terminals, room electronic modules, information displays and other units. The corridor data bus of a field bus card can be segmented into up to six sub-groups. There is an option to feed in the Systevo Control a unit redundant power supply via a decentralized power supply installed in the ward or living area. There is an option to include a bus terminator to terminate the corridor data bus (data / audio). An additional repeater (data / audio) is required after 64 active system components. There is the option to update the firmware of active system components (providing it is supported by the units). It is prepared for future device functionality subject to license to enable the use of additional service features.