The ABB AA/A 2.1.2 Analogue Actuator (order code AA/A2.1.2) converts KNX telegrams into analogue voltage signals (0…10 V) for HVAC and process control. This 2-fold surface-mounted unit is bus-powered (no auxiliary mains), rated IP54, and suits outdoor-adjacent or damp plant rooms where an MDRC rail is not available.

Each channel can be parameterized as 0…1 V, 0…5 V, 0…10 V, or 1…10 V DC. Unused outputs can be deactivated. Commission with ETS and the shared AA/XX.1.2 application; ABB i-bus® Tool supports advanced diagnosis.

Key Features

• 2 independent voltage outputs: Drive valves, dampers, EC fans, and 1…10 V ballasts from KNX.
• Selectable ranges: 0…1 / 0…5 / 0…10 / 1…10 V DC per channel.
• Bus-powered: No 230 V auxiliary supply — only KNX TP.
• IP54 surface housing: Wider environmental range (−20 … +70 °C) than MDRC siblings.
• ETS + i-bus Tool: Standard parameterization plus diagnostic tooling.
• Sister MDRC: For 4-fold voltage/current in the panel, see AA/S4.1.2.

At a Glance

Specification	Detail
Product type	KNX analogue actuator, 2-fold, surface-mounted
Order code	AA/A2.1.2
Product ID	2CDG110203R0011
Outputs	2 voltage channels
Signal ranges	0…1 / 0…5 / 0…10 / 1…10 V DC
Load / current	≥ 5 kΩ · max. 2 mA (4 mA for 1…10 V ballasts)
Supply	KNX bus only
Protection	IP54
Operating temperature	−20 … +70 °C
Bus system	KNX TP

Technical data, installation instructions, ETS .knxprod, drawings, EPLAN, and declarations are under Downloads.

Applications

• HVAC field devices: 0–10 V valves, dampers, and fan speed near the plant.
• 1…10 V lighting: Analogue ballast control where DALI is not used.
• Remote / IP54 locations: Surface mount when a distribution board is impractical.
• Panel alternative: Prefer AA/S4.1.2 for four channels with current (0/4…20 mA) on DIN rail.

Installation Notes

Surface-mount the IP54 housing, connect KNX via the pluggable screw terminal, and wire analogue outputs A…B (0.08…1.5 mm²). Assign the physical address with the programming button/LED. Import the official .knxprod (Downloads) into ETS under Manufacturers → ABB → Output → Analog Output.