Which tunnel addresses are used for IP Router IPR/S 3.1.1?
The following applies when using the ETS 4: When a Router from the product catalog is inserted, the first five free physical addresses in the line are automatically reserved for the tunnel connection.
When the ETS 5 is used, the tunnel addresses (PA) must be manually entered in the Properties window of the ETS. Unlike with the ETS 4, no automatic addressing takes place.
Also see: http://new.abb.com/low-voltage/products/intelligent-building-systems/abb-i-bus-knx/new-abb-i-bus-knx-ip-devices