The Series F Ethernet PLC-processor builds on previous processor designs and improves Ethernet communications with capabilities to auto-negotiate between 10Mbps and 100Mbps. The processor includes an RJ45 connector on the faceplate, allowing direct connection of CAT-5 Ethernet cabling while eliminating the need for an external transceiver. The new processor is designed to auto-negotiate between 10Mbps and 100Mbps during power up. An upgrade to RSLogix 5 programming software (version 7.1 or later) is necessary to manually negotiate data speeds or to use the new e-mail messaging capability that gives users the ability to send an e-mail to a relay server based on event and machine occurrences.