What causes Siemens SINUMERIK alarm 26010?

Parameter or machine data configuration error. Hardware fault on the NC or drive component. Part program error or illegal command. Communication fault between NC and drive or I/O modules. Software or firmware error requiring system restart.

How do I fix Siemens SINUMERIK alarm 26010?

1. Note the complete alarm text including any axis, channel, or block number values. 2. Check for related alarms active simultaneously in the SINUMERIK alarm list. 3. Power cycle the machine to clear transient faults. 4. Review the SINUMERIK machine data for parameters related to the alarm. 5. Consult the Siemens SINUMERIK alarm manual for alarm 26010 detailed remedy.

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Siemens SINUMERIK Controller

Overtravel/Limit · Intermediate · 30-120 minutes

Alarm 26010

Siemens 840D 26010 - Axis QEC: invalid acceleration characteristic

Alarm 26010 indicates that one or more QEC (Quick Error Correction) acceleration characteristic parameters ($AA_QEC_ACCEL_1, $AA_QEC_ACCEL_2, or $AA_QEC_ACCEL_3) for the referenced axis contain invalid values outside their permissible ranges. The QEC acceleration characteristic divides the error correction into three quantization zones, and parameter values must fall within defined boundaries for proper NCK execution.

Siemens SINUMERIKOvertravel/LimitIntermediate30-120 minutes

26010

Siemens 840D 26010 - Axis QEC: invalid acceleration characteristic

Axis QEC: invalid acceleration characteristic

Root Cause Summary

Alarm 26010 indicates that one or more QEC (Quick Error Correction) acceleration characteristic parameters ($AA_QEC_ACCEL_1, $AA_QEC_ACCEL_2, or $AA_QEC_ACCEL_3) for the referenced axis contain invalid values outside their permissible ranges. The QEC acceleration characteristic divides the error correction into three quantization zones, and parameter values must fall within defined boundaries for proper NCK execution.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
Access Diagnostics > Parameters > Machine Data (MD) menu on the 840D control. Navigate to Axis-specific MD: $AA_QEC_ACCEL_1, $AA_QEC_ACCEL_2, and $AA_QEC_ACCEL_3 for the faulted axis (identify axis from %1 in alarm text).
Do not edit parameters while axis is enabled or NCK is running.
2
Verify each parameter value is within valid range (typically 1-100 for acceleration quantization percentage). Cross-reference against the machine builder's commissioning documentation or contact Siemens factory settings for your specific 840D model.
Default values should rarely be modified unless qualified commissioning engineer has documented compensation requirement.
3
If values are out of range, reset to defaults: $AA_QEC_ACCEL_1 = default value, $AA_QEC_ACCEL_2 = default value, $AA_QEC_ACCEL_3 = default value. Use 'Reset to Default' function if available in Siemens HMI, or manually enter documented factory defaults.
4
Save MD changes via 'Store' or 'Write' command. Perform warm restart (NCK stop/start cycle) and verify axis motion test without alarm recurrence.

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