BE/S 4.20.1 4-Fold Binary Input Device Manual

This document describes the ABB BE/S 4.20.1, a 4-fold binary input device for coupling potential-free contacts with the ABB i-bus® EIB/KNX system. It details the device's technical specifications, including polling voltage, sensing current, manual operation keys, and application functions such as switching, dimming, shutter control, and light scene storage.