The ABB AC/S 1.1.1 Application Controller, Basic (order code AC/S1.1.1) is an HVAC automation controller for KNX — from central plant through room automation — aimed at energy-efficiency targets such as EN 15232 and LEED.

Pre-defined automation modules cover schedules, set-point calculation, heat curves, data logging, and device monitoring. Build custom modules with the graphical logic editor. An automatically generated web UI monitors and manages the KNX system. Engineering is entirely in ETS (no separate PC software).

Key Features

• HVAC automation modules: Schedule, set point, heat curve, logging, and device monitoring out of the box.
• Graphical logic editor: Create and reuse your own automation modules.
• Auto-generated web UI: Monitor and operate the KNX system from a browser.
• ETS-only engineering: Commission with ETS 5.6.5+ and the ABB AC/S Device Configuration App (DCA).
• Flexible supply: 24 V AC/DC or Power over Ethernet (PoE), plus KNX TP.
• BACnet sibling: Need BMS gateway built-in? See AC/S1.2.1.

At a Glance

Specification	Detail
Product type	KNX Application Controller, Basic, MDRC
Order code	AC/S1.1.1
Product ID	2CDG110205R0011
Group objects (max.)	2000
Group address assignments (max.)	16000
Automation modules (ASM, max.)	500
Web UI I/O (max.)	30
Auxiliary supply	24 V AC/DC or PoE
Width / weight	4 MW / approx. 192 g
Bus system	KNX TP

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

Applications

• Central HVAC: Plant-level schedules, heat demand, and set-point strategies on KNX.
• Room-to-plant continuity: Same controller family from primary systems to rooms.
• Energy-efficiency projects: Support EN 15232 / LEED-oriented HVAC automation.
• BMS without BACnet on-device: Use Basic when BACnet is handled elsewhere; choose AC/S1.2.1 for integrated BACnet/IP.

Installation Notes

Mount on a 35 mm DIN rail (4 MW). Connect KNX TP and supply 24 V AC/DC or PoE. Commission with ETS 5.6.5 or later and the free ABB AC/S DCA from the KNX online shop. Import application and documentation from Downloads.