Separate networks for high reliability
Two physically separated networks were used for the automation applications and PC applications so that, for example, data-intensive camera surveillance does not affect other applications. Redundant ring structures and redundancy mechanisms such as the High Speed Redundancy Protocol (HRP) and Standby Coupling, Virtual Router Redundancy Protocol (VRRP) and Open Shortest Path First (OSPF) routing protocol achieve shortest reconfiguration times in the event of a fault – and thus the highest availability of the entire crane network.
Reliable solution with redundant ring structures
The hub of the three-level network solution is formed by Layer 3 Scalance XR552-12M routers – two of each connected to a redundant ring in the operator's data center. One pair is for networking the automation components and the other for PC-based applications. All four routers are connected via a Scalance S615 Industrial Security Appliance to the higher-level backbone of the operator network. The routers communicate with the subordinate, similarly ring-redundant block level – each made up of two series X-300 Scalance Layer 2 switches per block in separate VLAN (Virtual Local Area Network) segments. With four further X-300 and X-200 series switches for each crane, the number of installed Scalance devices increases to more than 300. The network has over 1,000 participants, each of which was allocated a unique IP address so that they can be quickly identified and addressed.