Modicon TM4 - Ethernet Switch Ethernet switch for Modicon M241 and M251 logic controllers. The TM4ES4 Ethernet module provides an Ethernet interface to controller whithout an embedded Ethernet port. The module is also an Ethernet switch. 4 x RJ45 connectors for Ethernet communication Tranfer rate from 100 Mbit/s maximum Green and yellow status LED 1 screw for functional ground connection Schneider Electric Modicon TM4