ABSTRACT
International fieldbus standardization has always been a difficult endeavor. The adoption of Ethernet technology for industrial communication between controllers, and even for communication with field devices, supports direct Internet capability in the field area, for instance, remote user interfaces via Web browser. Typical cabling topology of Ethernet is the star topology, all devices are connected to a central switching device. Users of a Real-Time Ethernet (RTE) network have different requirements for different applications. Several RTE solutions use the TCP/User datagram protocol/IP protocol stack without any modification. With this protocol stack, it is possible to communicate over network boundaries transparently, also through routers. The RTE- time-critical control network (TCnet) Application Layer Service defines the common memory system. The common memory is a virtual memory shared over the RTE-TCnet network by the participating application processes running on each node.
