Siemens SINUMERIK codes
Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

6421

Siemens 840D 6421 - Channel tool move not possible. Empty location for tool on

Channel tool move not possible. Empty location for tool on

Siemens SINUMERIK alarm 6421: Channel tool move not possible. Empty location for tool on. 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 6421 fires when the NCK attempts to execute a tool change command but cannot locate an available empty slot in the tool magazine for the specified tool. This occurs when tool magazine capacity is exceeded, slot assignments are misconfigured, or the tool changer's location table (MD 24100 - MD 24199 range) contains invalid or occupied location references.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Causes and Fixes

  1. 1

    Access Diagnostics > Tool Management in the MMC. Verify actual magazine occupancy against MD 20050 (tool magazine max capacity). Compare physical magazine state against the NCK's internal location bitmap.

    Do not force tool changes while magazine is full; this can damage the tool changer.

  2. 2

    Check PLC tool magazine status via the tool changer interface (typically OB 240 tool change routine). Review the location bitmap in the tool management DB to ensure empty slots are correctly flagged. If bitmap is incorrect, perform a manual magazine inventory via MMC Setup > Tool Management > Refresh Inventory.

  3. 3

    Verify MD 20070 (tool magazine location type) and MD 24100-24199 (tool location assignment table) are correctly configured for your magazine geometry. Confirm that occupied/empty slot flags match physical reality by manually checking 3-5 random locations.

  4. 4

    If bitmap corruption is suspected, perform a warm restart of the NCK (Diagnostics > System > Warm Start). This forces the tool management system to reinitialize the location table from EEPROM parameters.

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