BX8 KNX Elsner: Smart Solar Shading Automation for Buildings | MT Distribuzione

BX8 KNX by Elsner: Intelligent solar shading automation for high-performance buildings

6 Aug 2025

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BX8 KNX by Elsner: Intelligent Solar Shading Automation for High-Performance Buildings

In the context of advanced automation for smart buildings, the BX8 KNX by Elsner Elektronik represents an outstanding solution for comprehensive solar shading management. Designed for DIN rail mounting, the BX8 KNX Blind Control Extension module allows precise and dynamic control of up to eight façades, integrating seamlessly into home and building automation systems based on the KNX standard.

Precise Solar Control on Eight Facades: Slat & Shadow Edge Tracking

The main function of the BX8 KNX is the intelligent automation of shading devices such as awnings, external venetian blinds, roller shutters, and louvre systems. The module performs real-time slat tracking and shadow edge tracking, adjusting the slat angles and closing positions according to the sun's position and the façade orientation. This optimizes indoor visual and thermal comfort while reducing energy consumption associated with cooling systems.

Adaptability to building geometry and shading type:

Configuration of slat width.
Adjustment of façade alignment.
Individual control customization for up to 8 façades.

Integration of Climate Data for Automatic Protection

The BX8 KNX goes beyond solar control, incorporating protective functions against wind, rain, frost, and heat. The module can process environmental data from KNX weather stations (necessary for proper operation) and trigger protective actions based on the following parameters:

Wind speed.
Precipitation (rain/snow).
External and internal temperatures.
Global solar radiation.

This protection logic prevents damage to shading elements and ensures safe and automated operation even in adverse weather conditions.

Advanced Time-Based Automation: Weekly, Seasonal, and Event Timers

The flexibility of the BX8 KNX extends to time-based programming, thanks to a highly detailed timer system:

Seasonal Timer: up to 4 seasons, with 2 time periods per day.
Weekly Timer: 24 customizable time slots.
Event Timer: up to 8 events manageable via specific logic conditions.

This allows shading systems to be synchronized with the building's daily routines and customized scenarios (e.g., office mode, vacation, weekend settings).

9 Binary Inputs for Local Commands and Custom Logic

The BX8 KNX features 9 digital (binary) inputs for connecting push-buttons, contact sensors, or rotary encoders. These inputs allow:

Execution of manual local commands (e.g., raise/lower awning).
Activation of predefined KNX scenes.
Management of complex interaction logics with other bus devices.

All inputs are at KNX potential (SELV) and support cable lengths up to 10 meters.

Technical Details and Installation Features

The BX8 KNX is designed for fast and secure installation on a standard DIN EN 60715 rail, occupying 3 DIN modules (53 mm wide). The electronics are housed in a robust plastic enclosure (IP20), suitable for use in electrical cabinets or distribution boards.

Key Specifications:

KNX Supply Voltage: 30 V DC SELV, consumption ≤ 12.5 mA.
Configuration: S-Mode, up to 1920 communication objects.
Interfaces: 9 binary inputs.
Operating Environment: -5°C to +45°C, RH 0-95% (non-condensing).
Connections: spring terminals for conductors from 0.2 to 2.5 mm².

Complete Integration into the KNX System for Smart Building Management

The BX8 KNX stands out for its ability to integrate perfectly into complex KNX automation projects, offering:

Comprehensive status feedback (editable texts).
Logical programming based on weather conditions, schedules, and events.
Compatibility with manual control devices (buttons, encoders, touch panels).

This modularity makes the BX8 KNX ideal for commercial buildings, high-end residential projects, and any application where natural light control is strategic for both energy efficiency and user comfort.