PS0018

Navigate to OFFSET screen > WORK (G54-G59) and verify all axis values in the active work coordinate system. Note any unusually large positive or negative values that may be erroneous data entry.

Check SYSTEM > PARAM and review parameters 1320 (X+ stroke), 1321 (Y+ stroke), 1322 (Z+ stroke), 1326 (X- stroke), 1327 (Y- stroke), 1328 (Z- stroke). Confirm work offset + program coordinates do not exceed these limits.

Access POSITION screen > ABSOLUTE display and verify current machine position. Calculate total position (absolute position + work offset + programmed move) to confirm it remains within stroke parameters.

If work offset data is corrupted or incorrect, correct the values in OFFSET > WORK screen or reload from backup. Alternatively, set parameter 1201#0 (OFC) to 1 to enable offset write capability if protected.

Changing parameter 1201#0 requires power cycle to take effect. Ensure proper backup before modifying work offset data.

Review the program line causing the alarm and identify the G-code work coordinate command (G54, G55, G56, G57, G58, G59, or G54.1 P__).

Check SYSTEM > PARAM > parameter 1220 to verify the number of additional work coordinate systems available. For G54.1 P__, the P value must not exceed the value in parameter 1220 (typically 48, 96, or 300 depending on option).

Verify option specification at SYSTEM > CONFIG or boot screen to confirm that Additional Work Coordinate Systems option is enabled. Without this option, only G54-G59 are available.

If G54.1 P__ is required but not available, modify program to use standard G54-G59 coordinates, or contact Fanuc/machine builder to purchase and install the Additional Work Coordinates option.

Adding CNC options requires proper software keys and may necessitate control reconfiguration.

Check MAINTENANCE > BATTERY screen or DIAGNOSIS > STATUS for low battery voltage warning (typically DIAGNOSIS #0070 shows battery voltage). If below 3.0V on standard systems, battery replacement is urgent.

Battery failure can result in complete loss of all parameters, offsets, and macro variables. Replace battery immediately if voltage is low.

Navigate to SYSTEM > PARAM and verify parameter 1202#0-#3 (coordinate system selection bits) are set correctly for your machine configuration. Incorrect settings may cause coordinate calculation errors.

Backup all data via SYSTEM > PMC or I/O channel, then initialize work offset data by setting all offsets to zero manually or reload from known good backup file. Verify alarm clears after reloading.

If alarm persists after data reload, perform parameter clear and reload all parameters from verified backup. Access SYSTEM > PARAM > [INIT] following proper Fanuc procedure for your specific control series with proper key switch position.

Parameter initialization erases ALL parameters, offsets, pitch error compensation, and custom settings. Only perform with complete verified backup and machine builder documentation available.