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Press OFFSET key, navigate to WORK ZERO OFFSET screen. Check all active work offsets (G54-G59, G54.1 P1-P48) for abnormally large values (exceeding machine travel or beyond ±99999.999mm/inch).

Access SYSTEM > PARAM and verify parameter 1320 (maximum input value for coordinate data). Compare against current offset values. Check parameters 5440-5443 (offset value limits for X, Y, Z) and 5444-5447 (4th-7th axis limits) if set.

If offset values are corrupted, reset specific work offset by entering 0.0 in X, Y, Z fields or restore from known-good backup. For macro-driven offset writes, verify program logic uses appropriate range checking before writing to #5221-#5346 variables.

Clearing work offsets will require re-establishing part zero. Record existing valid offsets before clearing.

If problem persists after clearing offsets, backup and restore offset data via SYSTEM > PMC > I/O screen or memory card backup function. Check battery voltage (DIAGNOSIS > STATUS > BATTERY) for offset memory retention issues.

Press OFFSET key, navigate to TOOL GEOMETRY or TOOL WEAR OFFSET screen. Inspect all active tool offsets (T01-T999 depending on parameter 6800 setting) for values exceeding typical ranges (length >999mm, radius >500mm).

Access SYSTEM > PARAM and check parameter 5013 (maximum tool offset value, typically 99999999). Verify parameters 5025 (X-axis tool offset limit), 5026 (Z-axis), 5027 (Y-axis), and 5028 (additional axis limits) are correctly set for machine configuration.

Correct offending tool offset by entering valid value or resetting to 0.0. If using macro programs with offset writes (#10001-#19999 for geometry, #11001-#29999 for wear), add range validation logic before assignment.

Tool offset changes affect machining results. Re-measure tools and verify offsets before production.

Check parameter 0000 bit 7 (TWE - Tool Offset Write Enable). If bit is 0, enable it temporarily for offset correction, then disable after correction to prevent accidental program-based offset overwrites.

Review active NC program around alarm occurrence. Search for macro variable assignments to offset system variables: #5221-#5226 (current work offset), #5241-#5246 (G54), #2001-#2999 (tool wear), or #10001-#19999 (tool geometry).

In MDI mode, manually inspect suspected offset variable values. Example: enter program 'N10 #100=#5221 N20 M30' to read current G54 X-offset into #100, then check #100 on SYSTEM > MACRO > VARIABLE screen.

Add conditional range checking in macro program before offset writes. Example: IF[ABS[#100]GT1000]THEN#3000=1(OFFSET_EXCEEDS_LIMIT) before #5221=#100 assignment. Verify calculation logic for sign errors or missing decimal points.

Test modified macro programs in single-block mode with feed override at 0% to catch errors.