Internet-Security.com UDP port 34980 details

UDP port 34980 is registered by IANA for EtherCAT.
In real deployments, it is used by Beckhoff’s EtherCAT Automation Protocol (EAP), which runs over UDP for controller-to-controller data exchange.
Beckhoff TwinCAT 3 systems (e.g., CX-series PLCs like CX9020/CX51xx and Beckhoff IPCs) use UDP/34980 for EAP cyclic publisher/subscriber and multicast communications on factory networks.
Beckhoff’s TwinCAT 3 EAP function (e.g., TF6760) is a common software component that communicates on this port.
No widely documented hacking/exploitation campaigns are specifically tied to UDP/34980; risks are typical of exposing industrial control traffic to untrusted networks.

UDP 34980