Clean Group Address Structure for Scalable KNX Projects
In many projects, I’ve seen group addresses set randomly or just based on the physical layout, and while that might work at the beginning, it becomes confusing later especially during maintenance or when handing over the project to another integrator.
A better approach we follow is this:
Use a clear, structured format for group addresses from day one, based on function and floor/zone. For example:
Main group = Floor
Middle group = Function (Lighting, HVAC, Shutters, etc.)
Sub group = Room or Individual channel
Example:
1/1/1 – Ground Floor / Lighting / Living Room Main Light
1/2/3 – Ground Floor / HVAC / Master Bedroom Thermostat Mode
2/1/5 – First Floor / Lighting / Child Room Spotlights
This way, everything stays readable even after years, especially when using diagnostics or importing into visualization tools. It also helps when explaining the setup to a client or facility team.
It’s a small habit but it really pays off on large projects.
Would be glad to hear how others approach this as well.
Best regards,
Ahmed Madhoor
Ulti Trend – Smart Home Technologies
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Thank you for sharing your approach! I completely agree that a structured format for group addresses is crucial for long-term clarity and ease of maintenance. Your method of categorizing by floor, function, and specific rooms makes it intuitive and scalable.
In our projects, we often manage around 65,000 group addresses, so I believe there’s no need to be overly restrictive with the addressing scheme. Utilizing the entire range can actually enhance organization and prevent confusion. There are 32 main groups, 8 middle groups, and 255 group addresses, which gives us flexibility while maintaining clarity.
We also have the habit of implementing dummy main groups to better visualize the separation between floors. For example, we use
0/0/0as a dummy for the Ground Floor and1/1/1for the actual Ground Floor address, while6/0/0serves as a dummy for the First Floor and7/1/1for the actual First Floor address. This additional layer helps in quickly identifying which floor a particular address belongs to, further enhancing clarity.Additionally, documenting the addressing scheme in a standardized manner, particularly in a table-structured form, has proven invaluable.
Looking forward to hearing more from others!
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