When the project is compiled, the routing data is generated automatically by the network configuration of the S7 project in STEP 7 and saved in the system data in SDB999. You cannot delete this SDB in the system data container.
If you create each controller in a separate S7 project, then no routing SDBs are created. Communication between the individual controllers then takes place via unspecified connections.
System data blocks, Switch off, Remove, Routing, S7 routing