BI04F01KNX is an Eelectron KNX binary-input product identified in the supplied model list. Binary input devices are used to connect external dry-contact devices such as conventional push buttons, switches, reed contacts and compatible sensors to a KNX installation. Depending on the exact hardware variant and ETS application, input events can be mapped to switching, dimming, shutter, scene or other bus functions. The precise number and electrical characteristics of inputs must be taken from the model-specific datasheet; these have not been assumed from the model code alone. The Eelectron catalogue documents the BI family as DIN-rail KNX input modules, with certain variants also supporting NTC probes, logic functions or mains-voltage sensing.