The ABB LFO/A1.1 Outside Light Sensor is the outdoor sensor head for the HS/S4.2.1 KNX light-sensor interface. It measures twilight / light value on façades or canopies — it is not a standalone KNX bus device.

Mount outdoors and wire to the HS/S4.2.1 MDRC module. Use for dusk/dawn lighting and light-dependent shutter scenes.

Key Features

• Outdoor sensor head: Surface / canopy mounting.
• Pairs with HS/S4.2.1: KNX interface + ETS application live on the MDRC.
• Twilight / light value: 1–100 lux or 100–20,000 lux via HS parameterization.

At a Glance

Specification	Detail
Product type	Outside light sensor (accessory)
Order code	LFO/A1.1
Product ID	2CDG120045R0011
Mate device	HS/S4.2.1
Bus	None (sensor head only)
Mounting	Outdoor surface

HS manuals, LFO drawings, EPLAN, and declarations are under Downloads. ETS .knxprod is on the HS/S4.2.1 page.

Applications

• Outdoor lighting: Dusk/dawn automatic switching.
• Façade blinds: Light-dependent shutter scenes.

Installation Notes

Install LFO/A1.1 outdoors per the sensor drawing. Wire to HS/S4.2.1 in the distribution board. Commission via the HS ETS application.