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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 840D 28007 - NCU link: conflict in configuration data of NCU
Alarm 28007 fires when the local NCU detects a mismatch between its own NCU link configuration and the configuration of a remote NCU node during power-up initialization. This typically involves discrepancies in machine data parameters that define NCU link topology, node count, or module assignments across the distributed SINUMERIK system.
28007
Siemens 840D 28007 - NCU link: conflict in configuration data of NCU
NCU link: conflict in configuration data of NCU
Siemens SINUMERIK alarm 28007: NCU link: conflict in configuration data of NCU. This alarm indicates a fault or error condition on the SINUMERIK 840D control. Refer to the Siemens SINUMERIK alarm documentation for the complete description and remedy.
Root Cause Summary
Alarm 28007 fires when the local NCU detects a mismatch between its own NCU link configuration and the configuration of a remote NCU node during power-up initialization. This typically involves discrepancies in machine data parameters that define NCU link topology, node count, or module assignments across the distributed SINUMERIK system.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access Siemens SINUMERIK 840D HMI or Engineering Tool. Navigate to Diagnostics > Machine Data > Category 28 (NCU Link). Locate MD 28000.
Do not modify during active machine operation.
- 2
Document the local NCU's MD 28000 value and compare with the remote NCU node referenced in the alarm parameter %1. Both values must be identical.
- 3
If values differ, edit MD 28000 on the local NCU to match the remote node configuration. Save changes and perform a complete NCU restart (power cycle or warm restart via Maintenance > System > Reset).
Verify configuration files are backed up before modification.
- 4
Monitor NCU link initialization on the Diagnostics screen. Confirm alarm 28007 clears after restart.
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