- - spare part - - communications processor CP 343-1 Advanced for connection of SIMATIC S7-300 CPU to Industrial Ethernet: PROFINET IO controller and/or IO device; RT and IRT, MRP, PROFINET CBA; TCP/IP, ISO, UDP, S7 communication, S5-compatible communication (send/receive) with fetch/write RFC1006, multicast diagnostic extension, SNMP, DHCP, FTP client/server, email, Gigabit-SS1X RJ45 (10/100/1000) PROFINET interface 2x RJ45 (10/100 Mbps); PROFINET CBA; firewall/VPN; PROFIenergy.