Cause

Within a configuration project a bus slave and bus master that belong to the same logical network differ in regards to the Physical network: Name property.

Solution

1. Locate the bus ports of the bus slave and the bus master in the schematic using the Go to (graphic) and Go to 2nd coordinate functionalities from the popup menu of the Message management dialog.
2. Call up the property dialog of the bus ports and in the Bus data tab check the value entered respectively in the Physical network: Name field.
3. Copy the value from the Physical network: Name field at the bus port of the master, insert it into the field by the same name at the bus ports of the slaves and confirm the entries.
   Or alternatively for a manual change use the menu items Project data > PLC > Complete data > Synchronize names of physical networks.
4. Then start a new check run.