communications processor CP 443-1 for connection of SIMATIC S7-400 to Industrial Ethernet over ISO, TCP/IP and UDP, S7 communication, fetch/write, send/receive with and without RFC1006, multicast, PROFINET IO controller, DHCP, SNMP V2, web, diagnostics, initialization via LAN, access protection via IP access list integrated real-time switch ERTEC 400, 2xRJ45 connection for LAN with 10/100 Mbps.