ABB ABL/S 2.1 — Allows the devlopment of complex logical functions by simply combining different logic elements and gates using a graphical user interface as an ETS plug-in from ETS3. No additional software is required. There are 50 logical elements (AND, OR, 1ofN), 50 uni- and bidirectional gates, 30 timer modules (On- /Off delay, impulse duration, and stairway light controller), 10 comparators, 200 worksheets, 250 Marker and 254 In- and Outputs are available. No additional power supply required, the device is powered from KNX bus.