F30611

Defect in a monitoring channel

Siemens · SINAMICS G120

What does F30611 mean?

A defect has been detected in a monitoring channel. The fault value r0949 provides more detailed information on the specific issue. This indicates a critical problem with safety monitoring that needs further investigation to ensure safe operation.

Common Causes

  • Internal hardware defect within the safety-related drive option module or integrated safety board.
  • Discrepancy between redundant monitoring channels (e.g., processor 1 and processor 2) exceeding internal tolerance.
  • Corrupted EEPROM data in the safety module preventing proper initialization or operation.
  • Electromagnetic interference (EMI) affecting internal communication paths within the safety circuit.
  • Permanent internal power supply failure to the safety logic components.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Record the exact fault value from r0949 (fault code additional info) for detailed diagnosis.

  2. 2

    Power cycle the inverter and observe if the fault persists after re-initialization.

  3. 3

    Perform a safety function hardware test by triggering STO and monitoring diagnostic bits r0947.x for correct response.

  4. 4

    Verify module temperature (r0037) to rule out overheating of internal safety components.

  5. 5

    If r0949 indicates an internal hardware error (e.g., value 10), prepare for safety module replacement.

Browse all codes in this manual (109)
Verified technical data. Last updated: March 2026

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