Simatic net, cp 343-1 lean communications processor f. connection of simatic s7-300 w. ind. ethernet using tcp/ip and udp, send/receive with and w/o rfc1006, s7 commun. , multicast, fetch/write, diagnostic expansions, loadable communication blocks, snmp diagnostics, initializ. using lan, 10/100 mbit, rj45 port for lan