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Navigate to SYSTEM > PARAM and check Parameter 13280-13299 (tool life management group parameters) for invalid values or corruption. Verify Parameter 13280 bit settings for tool life management enablement.

Access the tool life management screen via OFFSET/SETTING > LIFE and observe if data displays as garbled, negative numbers, or overflow values indicating memory corruption.

Check battery voltage on diagnostic screen SYSTEM > DIAGNOSIS > BATTERY. If voltage is below 3.0V or battery alarm present (LOW BATT indicator), replace battery immediately and re-register all tool life data.

Battery replacement requires parameter backup. Power loss during replacement will erase all parameters and tool data if backup battery is depleted.

Clear all tool life data by executing G10 L3 P0 (clears all groups) from MDI, then re-register tool life management groups and tool data systematically using G10 L3 Pn commands with valid tool numbers and life values.

Review the last executed G10 L3 command in program memory or MDI history. Verify syntax: G10 L3 Pn (group number) where n must be within range defined by Parameter 13281 (number of tool life management groups, typically 1-512).

Check that tool numbers specified in G10 L3 data do not exceed the maximum tool number defined in Parameter 13201 (maximum tool number for magazine, typically 1-999). Tool numbers of 0 or negative values are illegal.

Verify life count values are positive integers within allowable range (typically 1-99999999). Access OFFSET/SETTING > LIFE and examine the specific group showing the error for illegal data entries.

Re-register the affected tool life group using correct G10 L3 format from MDI: G10 L3 P[group#] L[life type] Q[life value] R[tool#]; where L=1 for count, L=2 for time in minutes. Execute with proper syntax and valid ranges.

Navigate to SYSTEM > PARAM and verify Parameter 13280 bit 0 (TLM: Tool Life Management enable) is set to 1. If this was recently toggled, existing data may be incompatible.

Check Parameter 13281 (number of tool life management groups). If this was reduced below the number of previously registered groups, data beyond the new limit becomes illegal. Increase to original value or clear excess groups.

Changing Parameter 13281 requires power cycle to take effect. Ensure value accommodates all registered tool groups.

Verify Parameter 13282 (number of tools per group) matches the registered tool structure. Mismatch causes data read errors. Standard value is 16-32 tools per group depending on system configuration.

After parameter correction, clear and re-initialize tool life management by executing G10 L3 P0 from MDI to delete all groups, then systematically re-register all tool groups with correct data matching current parameter settings.