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Check Program Manager Directory

Navigate to HMI → Program Manager and verify the subroutine file exists in the current workpiece directory or system directory structure.

Use the search function in Program Manager to quickly locate missing files across all directories.

Verify File Extension

Ensure the subroutine file has the correct .SPF extension for subprograms or .MPF for main programs in the SINUMERIK file system.

Incorrect file extensions will prevent the control from recognizing valid subroutine files.

Transfer Missing Files

Use DNC interface or USB transfer to copy the missing subroutine files to the appropriate workpiece directory via Program Manager.

Always verify file integrity after transfer by opening the file in the SINUMERIK editor.

Examine Subroutine Call Line

In the Program Editor, locate the line triggering the alarm and verify proper L-word syntax (e.g., L10 for subroutine call or L10 P1 for parameterized call).

Use the SINUMERIK syntax highlighting to identify formatting errors in subroutine calls.

Check Path Specification

Verify if absolute path references are correctly formatted using SINUMERIK directory syntax (e.g., /_N_WKS_DIR/_N_SUBPROG_SPF).

Mixing relative and absolute path references can cause unpredictable subroutine resolution failures.

Validate Parameter Passing

If using parameterized subroutines, ensure R-parameter assignments are properly defined before the subroutine call.

Use the Program Test function to simulate subroutine calls without machine movement.

Check Active Workpiece Directory

Navigate to Commissioning → Machine Data and verify MD18210 points to the correct workpiece directory path.

Document the original MD18210 value before making any changes for easy rollback.

Verify Search Path Settings

Check MD18212 (MM_SEARCH_RUN_DIR) to ensure the control searches the correct directories for subroutines during program execution.

Modifying search path machine data requires control restart to take effect.

Reset Directory Structure

Use HMI → Startup → Directory Structure to rebuild the workpiece directory tree if corruption is suspected.

Backup all programs before rebuilding directory structure to prevent data loss.

Check User Memory Status

Navigate to Diagnostics → Memory to verify available user memory and check for memory allocation errors in the SINUMERIK system.

Clear unnecessary files from temp directories to free up user memory space.

Perform File System Check

Execute a file system consistency check through Service → File System → Check to identify and repair corrupted directory entries.

File system repairs may result in loss of corrupted files - ensure backups are available.

Restart Control System

Perform a complete SINUMERIK control restart (power cycle) to reinitialize the file system and clear any temporary corruption.

Monitor the boot sequence for any file system error messages during startup.

Verify User Access Level

Check current user login level in HMI → User Management and ensure sufficient privileges to access the subroutine directory location.

Different protection levels may restrict access to system directories containing standard subroutines.

Check File Protection Status

In Program Manager, verify the subroutine file properties do not show write protection or access restrictions that could prevent execution.

Never modify system-level subroutines without proper authorization and backup procedures.

Review Protection Level Settings

Examine MD9100-9107 (protection level configuration) to ensure program execution rights are properly configured for the current user level.

Consult machine documentation for specific protection level requirements for subroutine access.