The ABB ABA/S 1.2.1 Logic Controller (order code ABA/S1.2.1) is a powerful 4 MW MDRC logic engine for ABB i-bus® KNX. The logic editor is integrated in ETS with up to 3000 logic elements, simulation for testing, and user-defined function blocks that can be saved and reused.

Auxiliary supply is 24 V DC or alternatively Power over Ethernet (PoE). Date/time for timer functions must be provided via KNX/TP. For lighter graphical logic on bus power only, see ABL/S2.1; for yearly schedules see ABZ/S2.1.

Key Features

• Up to 3000 logic gates: Large-scale interlocking, sequences, and energy strategies in one controller.
• ETS-integrated editor: No separate logic IDE — configure inside ETS with simulation.
• Custom function blocks: Create, save, and reuse user-defined blocks.
• 24 V DC or PoE: Flexible auxiliary power for panel or PoE-ready installs.
• High object capacity: Up to 500 group objects, 2000 group addresses / assignments (application-dependent).
• WebUI inputs/outputs: Up to 60 WebUI I/O points for visualization hooks.

At a Glance

Specification	Detail
Product type	KNX Logic Controller, MDRC
Order code	ABA/S1.2.1
Product ID	2CDG110192R0011
Logic capacity	Up to 3000 logic elements
Group objects (max.)	500
Group addresses / assignments (max.)	2000 / 2000
WebUI I/O	Up to 60
Auxiliary supply	24 V DC or PoE
Width / weight	4 MW / approx. 192 g
Bus system	KNX TP

Technical data, product manual, installation instructions, drawings, EPLAN, and declarations are under Downloads.

Applications

• Central building logic: Complex interlocks across HVAC, lighting, and security from one MDRC.
• Simulation & commissioning: Test logic in ETS before going live on site.
• Reusable libraries: Ship standardized function blocks across projects.
• Companion devices: Pair with ABL/S2.1 for smaller graphical logic or ABZ/S2.1 for calendar/time macros.

Installation Notes

Mount on a 35 mm DIN rail (4 MW Pro M). Connect KNX front terminal plus 24 V DC or PoE auxiliary. Provide date/time via KNX when using timer functions. Commission with the Logic Controller ETS application and follow the product manual in Downloads.