Example ethernet network topology


This tutorial provides an example ethernet network wiring diagram for the cMT series HMI. This network topology example may be used as a reference for all HMIs with two ethernet ports.


When configuring an ethernet network for an HMI, each LAN port must be assigned a unique IP address on separate subnets, except for some HMIs with an active Codesys license. Communication issues may occur if the IP addresses assigned to each ethernet port (LAN1 and LAN2) are on the same subnet. Even if the ethernet port is not in use, it must be assigned an IP address on a separate subnet.


  • LAN1:
  • LAN2:
  • PLC: