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Access Program Manager

Navigate to HMI → Program Manager → NC Programs to view file list and check file extensions.

Look for files with .SPF or .MPF extensions that show unusual file sizes

Check file properties

Right-click on the problematic file and select Properties to verify if it's marked as binary or compiled.

Do not attempt to force-edit binary files as this can corrupt the program

Access source code

Look for the original source file with .SPF.SRC or .MPF.SRC extension, or restore from backup if available.

Enable 'Show source files' in Program Manager settings to display .SRC files

Recompile if necessary

If source exists, delete binary version and let SINUMERIK recompile from source during next program call.

Identify file type

Check if file is located in /siemens/sinumerik/sys/ or similar system directories through HMI → Diagnostics → File System.

Never attempt to directly edit system binary files as this can damage the control system

Use proper configuration tools

Access machine data through HMI → Commissioning → Machine Data or use SINAMICS Startdrive for drive parameters.

Use MD numbers directly in machine data interface rather than trying to edit files

Export configuration if needed

Use HMI → Archive → Export to create readable backup files of machine configuration.

Exported files are in readable format and can be edited before re-import

Check file system integrity

Navigate to HMI → Diagnostics → Memory → File System and run consistency check on NC program directory.

Backup all programs before running file system repairs

Examine alarm buffer

Check HMI → Diagnostics → Alarms → Alarm Buffer for related file system or memory alarms around the time of corruption.

Look for alarms 10xxx series related to file operations

Restore from backup

Access HMI → Archive → Import and restore the program from most recent backup archive.

Check backup timestamp to ensure you're restoring the correct version

Delete corrupted file

Remove the corrupted binary file through Program Manager after successful restoration to prevent confusion.

Check transfer history

Review how the file was loaded - via CF card, network transfer, or DNC connection through HMI → Program Manager → Transfer Log.

Files transferred via FTP should use ASCII mode for NC programs

Verify file format

Check original file on source system to ensure it's plain text NC code and not a CAM post-processor binary output.

Some CAM systems output proprietary binary formats that need conversion

Re-transfer correctly

Delete current file and re-transfer using ASCII/text mode through HMI → Program Manager → External Programs → Load.

Use 'Text' option in transfer dialog, not 'Binary' for NC programs

Restart HMI application

Close Program Manager and restart through HMI → System → Restart HMI Application to clear memory issues.

This resolves temporary file handling glitches without full system restart

Check HMI memory status

Navigate to HMI → Diagnostics → Memory → HMI Memory and verify sufficient free space and no memory errors.

Low HMI memory can cause file handling errors

Update HMI software

Check current software version in HMI → System → Version and compare with latest available updates from Siemens.

Document current version before updating in case rollback is needed

Reset file associations

Access HMI → Settings → File Types and reset NC program file associations to default text editor.