Code F01611: Defect in cross comparis.
Issue Description & Safety Warning
The Siemens SINAMICS G120 CU240S Drive has triggered a critical Defect in cross comparis. 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: Data exchange error between processors: - r0949 = 100: P2 has entered the safe torque off due to a drive fault on P2 or a subsequent fault of F1600/F1630 - r0949 = 102: Dynamic checksums are different on P1. Cross comparison fault or problem with processor com- munication. - r0949 = 103: Derived frequency is different on both processors. Cross comparison fault or problem with proces- sor communication. - r0949 = 104: Frequency error on P1 caused by VFM. - r0949 = 201: Frequency check with error on P2. - r0949 = 202: Dynamic checksums are different on P2. Cross comparison fault or problem with processor com- munication. Remedy: - Reduce EMC. - Perform a forced dynamisation
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 F01611 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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