What causes Siemens SINUMERIK alarm 104246?

Part program contains an illegal or unsupported command for the current machine configuration. Parameter or machine data setting incompatible with the commanded operation. Required option or function not enabled on this SINUMERIK control. Incorrect axis assignment or configuration for the commanded function. Software version or compile cycle version mismatch.

How do I fix Siemens SINUMERIK alarm 104246?

1. Note the full alarm message including any parameter values shown (e.g., axis number, block number, channel). 2. Identify the program block or operation that triggered the alarm. 3. Review the SINUMERIK alarm manual for alarm 104246 to identify the specific cause and remedy. 4. Check the relevant machine data parameters referenced in the alarm. 5. If the alarm persists after correcting the program, contact Siemens technical support with the full alarm text and machine data backup.

axismd.ai

Siemens SINUMERIK Controller

Program/G-code · Intermediate · 30-120 minutes

Alarm 104246

Siemens 840D 104246 - Error on reading user tool data

Alarm 104246 occurs when the control system cannot properly read user-defined tool data from the tool management system. This typically results from corrupted tool data files, incorrect file permissions, syntax errors in tool data definitions, or communication issues between the HMI and NCK when accessing tool parameters.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

104246

Siemens 840D 104246 - Error on reading user tool data

Error on reading user tool data

Root Cause Summary

Alarm 104246 occurs when the control system cannot properly read user-defined tool data from the tool management system. This typically results from corrupted tool data files, incorrect file permissions, syntax errors in tool data definitions, or communication issues between the HMI and NCK when accessing tool parameters.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Navigate to Commissioning > Machine data > Tool data, and attempt to display the affected tool. Note any error messages or missing data fields.
2
Check the NCK file system at /user/sinumerik/data for _N_TOOL_DAT and related files. Verify file size is not 0 bytes and file is accessible.
Backup all tool data files before making any modifications
3
If available, restore tool data from a known good backup or regenerate the tool list from the archive. Use the 'Load Tool List' function in the tool management menu.
4
If restoration is not possible, delete the suspected corrupted tool entry and recreate it manually with all required parameters (geometry, compensation, type).

Service Recommended confidence

Seeing Multiple Alarms?

Seeing another alarm with this one? Enter the code.

Get machine-aware diagnosis

AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.

Start free

Was this guide helpful?

Always verify with your machine manual or a certified technician before performing service procedures.