044

In MDI or EDIT mode, review the program block that triggered the alarm. Identify which canned cycle (G73, G74, G76, G80-G89) was last commanded before the G27-G30 reference return.

Insert G80 (canned cycle cancel) on the line immediately before the G27/G28/G29/G30 command. Ensure it is on a separate block or at the beginning of the reference return block.

Reset the alarm using the RESET key, return to program start or safe position, and restart the program to verify the G80 cancellation resolves the alarm.

After alarm reset, verify machine position on POSITION > ABSOLUTE screen before restarting to ensure no collision risk.

Check parameter 3405#0 (G28 reference return check) if set to 1, it enables strict modal checking. Review program structure to ensure all canned cycles include proper G80 cancellation before motion mode changes.

Navigate to EDIT mode and display the main program. Check if M98 subprogram call occurs after any G73-G89 canned cycle without intervening G80 cancellation.

Add G80 in the main program immediately before the M98 subprogram call, or add G80 as the first block in the subprogram (Oxxxx) to ensure clean modal state.

Review parameter 3404#1 (subprogram modal inheritance). If set to 0, modal groups reset at subprogram call. If set to 1, modal states are preserved across M98 calls.

Changing parameter 3404#1 affects all programs. Test thoroughly after modification as it impacts modal behavior globally.

Establish programming standard to include G80 G40 G49 G90 as initialization block at the start of all subprograms to ensure predictable modal state.

Press SYSTEM > ALARM to note the exact program block number (Nxxxx) and sequence where alarm 044 occurred. Use EDIT search function to locate this block in the macro program.

Trace macro logic backward from the alarm point. Check for GOTO statements, IF-THEN-ELSE conditions, or WHILE loops that may execute G27-G30 after a canned cycle without passing through G80 cancellation.

Insert G80 before each G27/G28/G29/G30 command in all conditional branches, or use macro variable #4003 (modal G-code group 9) to check if canned cycle is active before reference return execution.

System variable #4003 returns the active Group 9 modal code (73-89 for canned cycles, 80 if cancelled). Verify availability in OPERATOR'S MANUAL for your specific control series.