100156

Check USB connection status

Navigate to HMI → Services → USB and verify if the USB device is still recognized in the device list.

Use only industrial-grade USB devices rated for vibration environments

Inspect USB port and connector

Physically examine the USB port on the HMI/NCU and the connector on the storage device for damage, debris, or loose connections.

Power down the system before cleaning USB ports to prevent ESD damage

Restart transfer operation

Reinsert the USB device, wait for recognition, then restart the file transfer from HMI → Program Manager → External.

Always use 'Safely Remove Hardware' function before disconnecting USB devices

Test USB device on external system

Connect the USB device to a PC and run CHKDSK /F to check for file system errors and bad sectors.

Use USB devices with wear-leveling technology for industrial applications

Format USB device with FAT32

If errors are found, backup any critical data and reformat the USB device using FAT32 file system for optimal SINUMERIK compatibility.

Formatting will erase all data - ensure backups are available

Test with known good USB device

Use a different, verified working USB device to repeat the transfer operation and confirm the issue was device-specific.

Keep a dedicated USB device for each machine to avoid cross-contamination issues

Check system resources

Navigate to HMI → Diagnostics → System → Resources and verify available memory and CPU usage are within normal ranges (<80%).

Close unnecessary applications before large file transfers to free system resources

Restart HMI system

Perform a controlled restart of the HMI unit via HMI → Startup → Restart HMI to reset USB drivers and clear memory.

Ensure no active machining operations before restarting HMI

Update USB drivers if available

Check SINUMERIK software version and install any available USB driver updates through the service interface.

Document current software versions before any updates for rollback capability

Check file size limitations

Verify the file size is within SINUMERIK limits (typically 2GB for individual files) and available storage space on target location.

Split large backup files into smaller segments for more reliable transfers

Adjust transfer timeout parameters

Access machine data MD and check timeout settings related to file operations, typically found in MD11xxx series parameters.

Only modify machine data parameters if you understand their full impact

Transfer files in smaller batches

Instead of bulk transfers, copy files individually or in smaller groups to reduce transfer time and system load.

Use compression for large NC programs to reduce transfer time and storage requirements

Check network connectivity

Verify network connection stability using HMI → Diagnostics → Network and check for packet loss or high latency to USB server.

Use dedicated network segments for USB-over-IP to avoid bandwidth competition

Verify USB server status

Check the USB-over-IP server status and ensure the shared USB device is properly connected and accessible.

Network USB devices are not recommended for critical production file transfers

Switch to direct USB connection

Temporarily use a direct USB connection to eliminate network variables and confirm the transfer operation works reliably.

Configure network QoS to prioritize USB-over-IP traffic if network USB is required