104034

Open the active NC program in the editor and review the initialization section after the program header.

Insert the appropriate work offset command (typically G54 or G505 G54) in the program header or before the first G0/G1 movement command.

Verify that the selected work offset (e.g., G54) has valid offset values entered in the work offset memory under 'Offset' -> 'Work Offset'.

Reset the program, reselect it, and execute from the beginning to confirm alarm clears.

Search the NC program for G53 or G500 commands and identify where work offsets are cancelled.

After any G53 block (which is typically modal for one block only, verify SINUMERIK syntax), ensure a work offset (G54-G59) is reactivated before further machining operations.

If G500 is used intentionally, add the appropriate work offset command (G54-G59) immediately after the section requiring machine coordinates.

Test the modified program in single block mode to verify proper offset activation sequence.

G53 provides direct machine coordinate positioning - ensure safe positions are programmed to avoid collisions.

Check machine data MD28080 $MC_CHBFRAME_RESET_MASK to verify work offset reset behavior at program start and channel reset.

Modifying machine data requires password protection level and can affect machine behavior - document original values.

Review the startup NC programs (_N_INIT_SPF or _N_START_SPF in the MPF.DIR or WKS.DIR) for proper work offset initialization commands.

If startup files were recently modified, restore from backup or add G54 (or appropriate default offset) to the initialization routine.

Perform a control reboot (power cycle) and test with a simple program containing explicit G54 to isolate whether issue is system-wide or program-specific.