PROFIBUS/PROFINET: Bus configuration changed

What does 380503 mean?

This alarm indicates that a new SDB (System Data Block) with a modified configuration has been provided for the PROFIBUS/PROFINET bus. Similar to 380502, the new settings will only be activated upon the next bus power-up. This is an informational alarm requiring a system restart to apply the updated configuration, ensuring correct bus operation and avoiding potential communication errors.

• A global change in the PROFIBUS/PROFINET network configuration (e.g., adding a new segment, changing bus master settings).
• Firmware upgrade of the PROFIBUS/PROFINET master (PLC CPU) or an associated communication module.
• Project modifications involving network addresses, bus cycle times, or diagnostic settings for the entire bus.
• A major update or replacement of the central PLC or its communication processor.
• The engineering software performed a consistency check and generated a new SDB due to minor parameter adjustments across multiple devices.

Click steps to track your progress.

1. 1

   1. Acknowledge the alarm and determine if the bus configuration change was an intentional act (e.g., new project download).

2. 2

   2. Upload the active hardware configuration from the PLC into the engineering software to identify discrepancies with the existing offline project.

3. 3

   3. Review the PLC's diagnostic buffer (e.g., using Step 7 or TIA Portal) for further details regarding the specific SDB change.

4. 4

   4. If the change is expected, download the updated and verified hardware configuration from the engineering software to the PLC.

5. 5

   5. Perform a full Power OFF/ON cycle of the PLC and all associated PROFIBUS/PROFINET devices to ensure the new SDB is fully activated and initialized.

6. 6

   6. Verify operational status of all PROFIBUS/PROFINET devices after the configuration download by monitoring their diagnostic LEDs and process values.