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Power down the control and remove the CompactFlash card. Inspect for physical damage, bent pins, or write-protect switch position.

Always perform a proper shutdown sequence before removing storage media to prevent data corruption.

Insert the CompactFlash card into a PC card reader and check file system integrity using CHKDSK (Windows) or fsck (Linux). Verify the card is not write-protected.

Check available storage space on the card. Delete old log files, monitoring data, or archived files from /user/sinumerik/data or /card directories if space is below 10%.

If errors persist, replace the CompactFlash card with a Siemens-approved industrial-grade card and restore system backup. Re-archive existing data to external storage first.

Only use Siemens-certified CompactFlash cards rated for industrial use with sufficient write cycles.

Access HMI Service mode, navigate to Diagnostics > Memory, and check available storage space on all partitions. Identify which partition holds monitoring data (typically /user or /card).

Via HMI or service laptop, browse to /user/sinumerik/data and /user/common/trace directories. Delete obsolete monitoring files (.log, .trc, .dat files older than necessary retention period).

Archive critical log files to external storage before deletion for compliance and troubleshooting records.

Check directory permissions using the service laptop with RMOS access. Ensure monitoring directories have write permissions for the system user account.

Configure automatic log rotation in the system settings under Commissioning > System Data > Monitoring to prevent future storage exhaustion.

Verify network cable connections and switch port status. Check HMI network settings under Commissioning > Network Configuration for correct IP address, subnet mask, and gateway.

Test network connectivity by pinging the remote storage server from the HMI service mode or diagnostic terminal. Verify DNS resolution if using hostnames.

Check network share credentials and mounting status. Re-authenticate or remount the network drive with correct username/password. Verify share permissions allow write access.

Network credentials may be stored in machine data or initialization files - document before changes.

Temporarily redirect monitoring data to local storage in machine data settings to verify alarm clears, confirming network storage as root cause. Then resolve remote server issues.