PS011

Review the G-code program at the alarm line number. Check if G01, G02, or G03 appears without a preceding F command in the current program block or previous blocks since program start or M30 reset.

Verify feedrate range parameters: Check Parameter 1430 (minimum feedrate limit) and Parameter 1432 (maximum feedrate limit). Ensure the F value in program falls within these limits. Out-of-range values may be ignored by the control.

Add appropriate F command before the cutting move. For metric systems (G21), typical format is F100 for 100mm/min. For inch systems (G20), use F4.0 for 4.0 inches/min. Ensure F is specified in same block or prior blocks.

Check Parameter 0000 bit 0 (F code setting) to verify feedrate units (mm/min, inch/min, or mm/rev). Ensure program F values match the configured units and G98/G99 mode for drilling cycles.

Check if alarm occurred after emergency stop (RESET button), program restart, or mode switch (MEM/MDI/EDIT). These conditions clear modal F value in Fanuc controls depending on Parameter 3402 bit 6 (F modal retention setting).

Navigate to SYSTEM > PARAM and check Parameter 3402 bit 6. If bit 6=0, feedrate is cleared on reset. If bit 6=1, feedrate modal is retained. Adjust based on operational requirements and ensure program includes F command after resets.

Add F command to program initialization section (immediately after program number and safety blocks). This ensures feedrate is always established before any cutting moves regardless of restart conditions.

Check Parameter 1401 (initial feedrate value). If set to 0, no default feedrate exists. Consider setting a non-zero value as a safety default, though explicit F commands in programs are always recommended.

Relying on Parameter 1401 default is not best practice. Always program explicit F commands for safety and program portability.

Review current modal state at alarm point. Press SYSTEM > DIAGNOSIS > check Diagnostic 0200-0226 (modal G-code status). Verify G00/G01/G02/G03 state matches intended operation. G00 should not require F, but modal confusion may trigger alarm.

Check Parameter 1401 bit 3 (F code check). If bit 3=1, control strictly enforces F command presence for all cutting moves. If bit 3=0, enforcement is relaxed. Verify setting matches machine operational requirements.

If using custom macros (G65/G66) or subprograms (M98), verify that modal feedrate is properly passed or re-established within the called program. Macro variable #4119 contains current feedrate value and can be checked for debugging.