What causes Siemens SINUMERIK alarm 20096?

Part program contains an illegal or unsupported command for the current machine configuration. Channel or axis configuration does not support the programmed function. Required machine option not enabled for the commanded function. Axis assignment or transformation configuration error. Program execution sequence error.

How do I fix Siemens SINUMERIK alarm 20096?

1. Identify the program block that triggered the alarm — note the channel and block number. 2. Review the commanded function against the SINUMERIK programming manual. 3. Check if the required machine option is enabled for this function. 4. Verify axis assignments and transformation settings are correct for the application. 5. Consult the Siemens SINUMERIK alarm manual for alarm 20096 specific remedy.

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Siemens SINUMERIK Controller

System · Intermediate · 30-120 minutes

Alarm 20096

Siemens 840D 20096 - Axis brake test aborted, additional information

Alarm 20096 indicates the NCK brake test sequence has failed or been aborted for the specified axis. This occurs when the brake control logic detects an inconsistency between the expected brake state and actual axis behavior during the automated brake test cycle, typically triggered at machine startup or via MDI command.

Siemens SINUMERIKSystemIntermediate30-120 minutes

20096

Siemens 840D 20096 - Axis brake test aborted, additional information

Axis brake test aborted, additional information

Root Cause Summary

Alarm 20096 indicates the NCK brake test sequence has failed or been aborted for the specified axis. This occurs when the brake control logic detects an inconsistency between the expected brake state and actual axis behavior during the automated brake test cycle, typically triggered at machine startup or via MDI command.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Navigate to Diagnostics > System > Axis Data and verify MD 32100 (Brake test active) setting. Confirm it matches the actual axis configuration in MD 32010 (Axis type: 1=linear, 2=rotary).
2
Check MD 32110 (Brake test time) and MD 32120 (Brake ramp time) are set to realistic values (typically 500-2000ms). If values are zero or invalid, reset to defaults via machine data editor.
Do not set brake test time below 200ms as this may cause premature timeout detection.
3
Verify axis is assigned to a valid NCK channel in MD 32000 (Axis number). Cross-reference with channel configuration in MD 20050 (Channel axes assignment).

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