Troubleshooting
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      Sources of error Connection of the inverters via ModBus TCP

      1. Checking the IP address in the digital twin

      • Access to the digital twin: Open the configuration interface of the digital twin.
      • Compare the IP address:
        • Check whether the IP address entered in the digital twin matches the IP address set in the inverter.


      2. Default port for Modbus communication

      • Check the communication port: The default port for Modbus TCP/IP communication is 502. Make sure that this is set correctly in both the digital twin and the inverter.

      3. Slave ID / unit ID / USS address

      • Matching the addresses: The slave ID (also called unit ID or USS address) must match the ID stored in the inverter.
        • Open the communication parameters in the inverter and compare them with the settings in the digital twin.

      Please note: There are sometimes fixed slave IDs for certain devices or inverter models with regard to TCP communication.

      4. Static IP or DHCP

      • Determine the IP assignment:
        • Check whether the IP address of the inverter is assigned statically or via DHCP.
        • If DHCP is currently being used, change the setting to a static IP and document the assigned address.

      Recommendation: Use static IP addresses for inverters to ensure that the IP address is not changed in the event of a communication failure.

      5. Network configuration

      • Check the network:
              • Make sure that the inverters and the logger are in the same network.
                • For more information, read the following article:
        Inverter wiring

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