Code F01650: Fault in safety parametr.
Issue Description & Safety Warning
The Siemens SINAMICS G120 CU240S Drive has triggered a critical Fault in safety parametr. 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
Reaction: OFF 2 (OFF 3) Acknowledge: Quit fault eg. via DI2 Cause: Error during startup or safety commissioning/reset: - r0949 = 0: Error during safety commissioning/reset. - r0949 = 1: Checksum error during safety commissioning or safety reset. - r0949 = 2: Error during internal parameter transfer. - r0949 = 3: Error finalizing the buffer transfer. - r0949 = 4: Failure during saving of parameters to EEPROM. - r0949 = 5: Error in safety parameter transfer during safety reset. - r0949 = 11: Communication channel between processors not ready. - r0949 =2000: Safety commissioning can only be finished by setting parameter p3900. Remedy: - Perform safety commissioning. - Try leaving via p3900 = 11.
Source: SINAMICS G120 Control Units CU240S Faults and Alarms (Edition 05/2007)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINAMICS G120 CU240S Drive Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code F01650 on the SINAMICS G120 CU240S Drive 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: 108 Siemens SINAMICS G120 CU240S Drive codes.
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