ETS 6.4 shows a nonexistent device in Programming Mode
Hi everyone,
I'm trying to commission a new MDT glass push-button in my KNX installation, but I've run into a strange issue with ETS.
Topology:
- Main line: 1.0 TP
- Subline: 1.1 TP
What happened:
I initially tried to commission the new MDT glass push-button with individual address 1.1.52. During the download, ETS displayed the following error:
The address of the device was successfully programmed but the final check of this procedure failed. Please check the topology. You may need to switch off the programming mode (LED) manually.
After several attempts, I disconnected the device from the KNX bus.
However, ETS still detects individual address 1.1.52 under Diagnostics → Individual Addresses → Programming Mode, with a hop count of 6.
The strange thing is:
- Programming Mode: 1.1.52 still appears.
- Individual Address Check: The device cannot be found.
- Line Scan: The device cannot be found either.
- Bus power cycle: I switched off the entire KNX bus and powered it back on, but the issue persists.
The original device is physically disconnected, and no device with address 1.1.52 should currently be responding on the bus.
Has anyone experienced this issue before?
Why does ETS continue to show 1.1.52 in Programming Mode when the address is not reachable through Individual Address Check or Line Scan?
Could this be an ETS diagnostic issue, a problem with the KNX interface, or something related to the failed download and programming-mode state?
Any advice on how to clear or further diagnose this would be greatly appreciated.
Thanks in advance!
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Hi there
I've had this issue before when another device was in programming mode beforehand, and then I selected the new device for download without it being in programming mode. This then downloaded the new address to the existing device. I also got the topology warning, since the device that was in programming mode was on a different line than addressed.
What happens if you try to read out "Device Info" from the address? Does it show a different serial number? Can you gather which address it should have based on the linked group addresses and product type? You can then set the old individual address for that existing device.
You can then connect the new device again, and put it into programming mode, "Download" all, and all should be well. If it doesn't work, you can try to download by serial number.
You say you disconnected the KNX bus, but which line did you disconnect? Just the backbone, or just the subline. Or both?
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