What causes Siemens SINUMERIK alarm 100901?

Required machine data or parameter not configured for the requested function. Option bit not set in SINUMERIK to enable the required functionality. Program references a function or axis that has not been configured. Machine commissioning incomplete — required setup step was not performed. Configuration data cleared or lost due to a parameter reset or hardware change.

How do I fix Siemens SINUMERIK alarm 100901?

1. Read the full alarm message to identify what is missing (axis name, parameter number, function name). 2. Consult the SINUMERIK alarm manual for alarm 100901 for the specific configuration requirement. 3. Check the relevant machine data group and set the required parameter. 4. If a specific option is required, verify it is licensed and enabled in the SINUMERIK option settings. 5. Power cycle after making configuration changes to apply the new settings.

axismd.ai

Siemens SINUMERIK Controller

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

Alarm 100901

Siemens 840D 100901 - No data changed

Alarm 100901 occurs when a data modification operation was initiated but no actual changes were made to the system parameters, settings, or program data. This typically happens when attempting to save identical data or when write operations fail silently without modifying the target data block.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

100901

Siemens 840D 100901 - No data changed

No data changed

Root Cause Summary

Alarm 100901 occurs when a data modification operation was initiated but no actual changes were made to the system parameters, settings, or program data. This typically happens when attempting to save identical data or when write operations fail silently without modifying the target data block.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Review the operation that triggered the alarm - verify if you actually modified any values before attempting to save.
2
If changes were intended, re-enter the parameter or data modification ensuring new values differ from existing ones.
3
Execute the save/write command again after confirming data has been modified.
4
Acknowledge the alarm with CANCEL KEY or RESET if no changes were needed.

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.