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ErrorLib — Industrial Fault Code Library

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C01799

Acceptance test mode active

Siemens · SINAMICS G120

What does C01799 mean?

The acceptance test mode is currently active, indicating that safety functions are being validated. This is a normal state during commissioning or re-validation of safety parameters and functions.

Common Causes

  • Commissioning engineer explicitly activated acceptance test mode via control panel or engineering software (e.g., Safety Integrated Commander).
  • Safety parameters (e.g., P30600, P30601) were modified, requiring re-validation of safety functions.
  • Initial power-up or system reset after a major configuration change or firmware update.
  • Completion of a mandatory safety documentation procedure for machine validation.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Confirm the acceptance test mode activation status on the HMI or drive display (r2124).

  2. 2

    Follow the acceptance test procedure specified in the machine's safety documentation or commissioning manual.

  3. 3

    Deactivate acceptance test mode via control word (e.g., Profisafe telegram bit or P30999) once validation is complete.

  4. 4

    Ensure all safety functions (e.g., STO, SS1, SLS) pass their respective validation steps and document results.

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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