26014

Access Siemens HMI > Diagnostics > Alarms > Archive and note the %1 axis number and %2 machine data parameter number from alarm 26014.

Navigate to Machine > Parameters > Axis-specific > [Axis] and locate the flagged MD parameter. Verify MD32010 (positive overtravel distance) is positive non-zero, MD32020 (negative overtravel distance) is negative non-zero, and both have consistent physical units (typically mm or degrees).

Do not enter values that contradict the axis type; rotary axes typically use smaller numeric ranges than linear axes.

Cross-check MD32000 (axis type: 0=linear, 1=rotary) matches the overtravel parameters. If MD32000=1 (rotary), overtravel values should reflect degrees (0-360 range typical); if MD32000=0 (linear), values reflect motion units.

Clear the alarm via HMI reset or NCK power cycle after correcting the parameter. Verify the axis definition in the Part Program editor or Axis Configuration tool shows consistent limits.

Open the machine data editor (Siemens HMI > Machine > Parameters > Machine Data Backup or NCK Editor). Locate the axis and MD parameter from the alarm. Verify the entry format matches the parameter definition: most overtravel MDs expect REAL or FLOAT (e.g., 150.5) not integers or alphanumeric.

Delete the invalid entry and re-enter using the correct syntax. Reference the MD catalog (Siemens documentation or HMI parameter assistant) to confirm expected data type and units. Use decimal notation for REAL values (e.g., 100.0, not 100).

If the parameter was imported via a backup file, verify the backup was created from a compatible 840D software version. Mismatched versions may cause type conflicts.

If manual entry does not resolve the alarm, use the NCK > Restore Factory Defaults option for that axis, then manually re-enter critical MDs from documented baseline machine configuration.

Document the flagged MD parameter and review related parameters: if alarm reports MD32010, also check MD32000 (axis type), MD32020 (negative overtravel), MD32030 (reference point offset), and MD32040 (axis length). Verify mathematical consistency: reference point + axis length should fall within ±(MD32010, MD32020) bounds.

Compare the machine data set against a known working backup or the original machine commissioning documentation. Identify which parameter was recently changed. Restore that parameter to its baseline value and test.

Use Siemens Machine Data Comparison tool (HMI feature) to highlight differences between current and reference configurations.

If no baseline is available, recalculate overtravel limits based on physical machine stroke and encoder range. Ensure positive overtravel ≥ 0 and negative overtravel ≤ 0, and that the reference point offset (MD32030) is reachable within these bounds.