Modbus Cross-Communication: Activating Different Port numbers in the Controller Firewall

  1. In the WAGO Solution Builder Plug-in an Application template was created that permits Modbus cross-communication.
  2. The Application template is available as an .atpkg file.
  1. Select the “Applications” menu item.
  2. Click [Select file].
  3. Upload the Application template as an .atpkg file.
  4. Drag and drop the Application template to assign it to a higher-order “Controller” entity (for example, Floor distributor).
  5. A further “Controller” entity is created each time a further item is assigned (dragged and dropped).
  6. Repeat Step 4 two times consecutively to create a total of three “Controller” entities.
  7. Select menu item “Cross-communication“.
  8. Configure two cross-communication links for the three new “Controller” entities (see 8 Configure Cross-communication).
  9. For each cross-communication link select Modbus TCP under Type.
  10. Under “Connector” select a connector for each cross-communication link that you defined in the WAGO Solution Builder Plug-in.
  11. Assign a unique port number for every cross-communication link. These port numbers must be different.


  12. Select menu item “Configuration“.
  13. In the tree structure, select one of the newly created “Controller” entities.
  14. Select the “CONTROLLER“ tab.
  15. Select the item “WBM – Web-Based-Management”.
  16. Check that the assigned port numbers are listed under “ControllerSettings”.
  1. The allocated port numbers will be activated on the next synchronization of the controller firewall.