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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 100150 - Directory could not be read
SIEMENS alarm 100150 'Directory could not read' occurs when the SINUMERIK system cannot access or read a directory structure, typically on the CF card, hard disk, or network drive. This is commonly caused by file system corruption, hardware failures, or incorrect access permissions in the NCK file system.
100150
Siemens 840D 100150 - Directory could not be read
Directory could not be read
Siemens SINUMERIK operator message 100150: Directory could not be read. This is an informational message from the SINUMERIK control indicating a system status or operation result that may require operator action.
Root Cause Summary
SIEMENS alarm 100150 'Directory could not read' occurs when the SINUMERIK system cannot access or read a directory structure, typically on the CF card, hard disk, or network drive. This is commonly caused by file system corruption, hardware failures, or incorrect access permissions in the NCK file system.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Check CF Card Status
Navigate to HMI → Diagnostics → Hardware → Storage and verify CF card status. Look for error indicators or 'not ready' status.
Use CHKDSK function in Windows partition if accessible
- 2
Perform File System Check
Access Service → System Data → Archive and attempt to read system directories. If errors occur, backup critical data immediately.
Always backup machine data before attempting file system repairs
- 3
Reformat CF Card
If corruption is confirmed, reformat CF card using SINUMERIK formatting utility in Service → System → Format Storage Device.
Keep spare formatted CF cards with base system image for quick recovery
- 4
Restore System Image
Restore SINUMERIK system image from backup or factory image using Service → System Data → Restore function.
Call a technician if:
- ·Hardware replacement required
- ·System image restoration needed
- ·Multiple storage devices failing
Prevention
- Perform regular CF card health checks
- Maintain UPS power protection
- Schedule periodic system backups
- Monitor network connectivity stability
Common Mistakes
- Ignoring early storage warnings
- Not backing up before repairs
- Using non-SINUMERIK compatible storage devices
- Forcing shutdowns during file operations
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Always verify with your machine manual or a certified technician before performing service procedures.