Built on the Industrial Ethernet ASIC, Ertec 400 (enhanced Realtime Ethernet controller) developed for Profinet-IRT, there are now two powerful Interbus proxies from Phoenix Contact. They differ only in the construction of the Interbus master: The FL NP PND-4TX IB uses copper wiring for the Interbus system. The FL NP PND-4TX IB-LK employs fibre-optic cabling.
All Interbus diagnostic functions, down to the individual circuit diagnostics, are mapped to Profinet mechanisms and 500-kilobaud and 2-megabaud systems can be connected. Profinet supports update rates as fast as 1 ms. This means that the proxy can be used when migrating applications to Profinet, making it possible to integrate anything from small Interbus segments to complete networks.
Both proxy devices combine the Interbus master with a four-port control cabinet switch which obviates the need for additional switching devices at the installation location. Several proxies can, for example, be switched together in a row. The proxy supports all protocols and functions required for Profinet, including the Lower Link Layer Discovery Protocol (LLDP) for obtaining topology information from the network. Both proxies therefore offer consistent, vertical integration of Interbus into any given Profinet-capable control system.
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