2

Safety Source Address Not Valid (F_Source_Add)

ABB · AC500

What does 2 mean?

The configured PROFIsafe source address (F_Source_Add) for the safety PLC is invalid. This prevents the safety PLC from properly identifying itself to other safety devices in the network, leading to potential communication failures and a compromised safety chain. The risk is that other safety components might not correctly process data from this PLC.

Common Causes

  • The F_Source_Add configured for the safety PLC in the project does not match the actual, internally assigned F_Source_Add of the PLC itself.
  • Manual configuration error when setting the F_Source_Add for the safety PLC in the PLC programming software.
  • A new safety PLC was installed, and its F_Source_Add was not correctly parameterized or is conflicting with another device.
  • Firmware update on the safety PLC reset or changed its internal F_Source_Add assignment logic, causing a mismatch.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the F_Source_Add configured for the safety PLC in the PLC programming software (e.g., device properties) matches its actual source address (e.g., from diagnostics).

  2. 2

    Ensure that the F_Source_Add is unique across the entire PROFIsafe network segment to prevent communication conflicts.

  3. 3

    Correct the F_Source_Add in the safety PLC's hardware configuration as needed.

  4. 4

    Recompile the entire safety PLC project and download the updated configuration to the safety PLC.

  5. 5

    Check the safety PLC's diagnostic buffer for specific information regarding the F_Source_Add issue.

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Verified technical data. Last updated: March 2026

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