The ABB HS/S4.2.1 Outside Light Sensor Interface is an MDRC KNX twilight / light-value switch. It ships with the outdoor sensor head LFO/A1.1 for facade or canopy mounting.

Parameterize as a twilight switch (1–100 lux) or light-value switch (100–20,000 lux) for outdoor lighting, shutters, or façade scenes.

Key Features

• Twilight mode: 1–100 lux threshold switching.
• Light-value mode: 100–20,000 lux continuous / threshold use.
• Includes LFO/A1.1: Outdoor light sensor accessory.
• KNX TP: Bus-powered MDRC interface module.

At a Glance

Specification	Detail
Product type	KNX Outside Light Sensor Interface, MDRC
Order code	HS/S4.2.1
Product ID	2CDG120044R0011
Sensor	LFO/A1.1 included
Ranges	1–100 lux / 100–20,000 lux
Width	4 MW
Supply	KNX bus

Product manual, installation instructions, ETS .knxprod, drawings, and declarations are under Downloads.

Applications

• Outdoor lighting: Dusk/dawn automatic on/off.
• Blind / façade: Light-dependent shutter scenes.
• Energy saving: Daylight-linked load enable.

Installation Notes

Mount the MDRC interface (4 MW) on a 35 mm DIN rail. Install LFO/A1.1 outdoors per the sensor drawing and wire to the HS module. Import the HS/S 4.2.1 .knxprod from Downloads.