Code 201107: <location>CU: Save to CompactFlash card unsuccessful
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>CU: Save to CompactFlash card unsuccessful alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Message value: %1 Drive object: All objects Reaction: NONE Acknowledge: IMMEDIATELY SINAMICS-Alarms Cause: A data save to the CompactFlash card was not able to be successfully carried out. - CompactFlash card is defective. - CompactFlash card does not have sufficient memory space. Fault value (r0949, interpret decimal): 1: The file on the RAM was not able to be opened. 2: The file on the RAM was not able to be read. 3: A new directory was not able to be created on the CompactFlash card. 4: A new file was not able to be created on the CompactFlash card. 5: A new file was not able to be written to the CompactFlash card. Remedy: - try to save again. - use another CompactFlash card.
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 201107 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
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