The TCSEFEC23FCF21 is Schneider Electric's ConneXium industrial firewall/router - the security appliance that sits between a machine cell and the rest of the network, instead of trusting a VLAN alone.

Why a firewall at the machine, not just a VLAN?

A VLAN separates traffic logically but shares the same hardware and trusts every device on the subnet. This firewall screens every packet at the port - stateful inspection plus intrusion detection - so a compromised office PC or a stray laptop can't open a session to the controller. The alternative - flat network or VLAN only - means one infected IT device is one hop from stopping a line.

What routing does it add beyond filtering?

It is also a router: IPv4/IPv6 with RIP, OSPF, and BGP, so the cell can sit on its own subnet and still reach the MES or cloud through a defined path. The copper port lands on the machine, the multimode fiber reaches the backbone - keeping the noisy shop floor and the corporate network on separate physical media, not just separate tags.