Code F01612: Diff. in hardw. detection
Issue Description & Safety Warning
The Siemens SINAMICS G120 CU240S Drive has triggered a critical Diff. in hardw. detection 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: The hardware (safety or non-safety hardware) could no be identified. - r0949 = 100: Identification error during startup on P1. - r0949 = 101: Runtime detection error on P1. - r0949 = 102: Hardware or software configuration error on P1. - r0949 = 200: Startup error on P2. - r0949 = 201: Runtime detection error on P2. - r0949 = 202: Hardware or software configuration error on P2. Remedy: - Inverter hardware is faulty or problem in processor communication. Perform a power cycle.
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 F01612 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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