What causes Siemens SINUMERIK alarm 104225?

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 104225?

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 104225 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.

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Siemens SINUMERIK Controller

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

Alarm 104225

Siemens 840D 104225 - No TO memory available in channel

Alarm 104225 indicates that the Tool Offset (TO) memory buffer in the active channel is exhausted or insufficient. This occurs when the number of active tool offsets exceeds the allocated memory resources, typically due to excessive D-number usage, multiple geometry offsets being called simultaneously, or improper memory allocation in the channel-specific machine data.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

104225

Siemens 840D 104225 - No TO memory available in channel

No TO memory available in channel

Root Cause Summary

Alarm 104225 indicates that the Tool Offset (TO) memory buffer in the active channel is exhausted or insufficient. This occurs when the number of active tool offsets exceeds the allocated memory resources, typically due to excessive D-number usage, multiple geometry offsets being called simultaneously, or improper memory allocation in the channel-specific machine data.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Review the NC program at the alarm point and identify all active tool offset calls (G41/G42/G43 with D-numbers).
2
Check machine data MD28020 $MC_MM_NUM_TOOL_OFFSET_BLOCKS to verify the maximum number of TO memories allocated for this channel (typical default is 9).
3
Modify the NC program to deactivate unused tool offsets using G40 (cutter compensation off) or reduce simultaneous D-number usage by structuring tool changes more efficiently.
Ensure G40 is programmed before tool changes and in safe positions to avoid contour violations.
4
If program optimization is insufficient, increase MD28020 value in increments (e.g., from 9 to 15) and perform a full system restart (Power Off/On with NCK reset).
Increasing this value consumes additional NCK memory; verify available system resources before modification.

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