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ErrorLib — Industrial Fault Code Library

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C01798

Test stop for motion monitoring is running

Siemens · SINAMICS G120

What does C01798 mean?

The inverter is currently performing a forced checking procedure (test stop) for its extended motion monitoring functions. This is a normal operational state during a safety test and indicates that the system is validating its safety capabilities.

Common Causes

  • Automatic periodic test for motion monitoring functions initiated by the safety controller.
  • Manual initiation of a safety test via HMI or safety engineering software (e.g., Startdrive).
  • System power cycle or reset triggering a safety self-test for motion monitoring.
  • Configuration change in safety parameters (e.g., P30650) requiring a verification test.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Monitor status parameter r0949 for the test progress and completion status.

  2. 2

    Confirm the status LED on the safety module (e.g., integrated safety F-CPU) indicates test activity.

  3. 3

    Wait for the test duration specified in Parameter P30650 (test interval) to complete.

  4. 4

    Verify that the motion monitoring safety function (e.g., Safe Speed Monitor) correctly re-engages after the test.

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

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Source: Siemens SINAMICS G120
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