75604

Navigate to Diagnostics > Program > RESU in NCK menu or access the part program directory containing cc_resu_ini.spf (typically in \\user\\sinumerik or machine defaults folder).

Open cc_resu_ini.spf in Editor and remove all block number designations (N-labels) from each NC block. Retain only the G-code and M-code commands without N prefix numbering.

Do not delete the subroutine structure itself; only remove block identifiers.

Verify syntax compliance: ensure no N-address labels exist and blocks are sequential without explicit numbering. Use Syntax Check (NCK > Compile) to validate the modified subroutine.

Reload part program and execute RESU cycle to confirm alarm 75604 is cleared and return traveling is operational.

Access the RESU subroutines directory and open cc_resu_end.spf in the NCK Editor (Diagnostics > Program > Part Program Editor).

Inspect all lines in cc_resu_end.spf and systematically remove N-block identifiers. Preserve all functional G/M codes and axis motion commands.

Ensure axis disable commands and safe stop logic remain intact; only strip the N-labels.

Save the corrected subroutine and trigger NCK Compile/Syntax Check to validate block structure. Confirm no compilation errors are reported in the Diagnostics panel.

Clear the alarm (Ctrl+Del or Panel reset), reload the part program, and test RESU execution to verify error code 1 no longer occurs.

Access Machine Data Editor (NCK > Machine Data > Channel-specific or Basic > RESU Parameters). Check MD20110 (or equivalent channel MD) to confirm correct subroutine file paths are assigned.

Verify the file path points to the standard SINUMERIK RESU subroutines without custom modifications. Compare against factory defaults or backup configuration if available.

If custom RESU files are in use, request the original subroutine source and validate that cc_resu_ini.spf and cc_resu_end.spf have never contained block number labels. Restore from backup if necessary.

Do not modify MD RESU path parameters unless subroutine files are confirmed block-number-free.

Clear alarm, perform cold start (Power On / Reset NCK), and re-test RESU to confirm alarm 75604 does not recur.