Hi @PabloPaul,
Thank you for your question.
To help narrow down the cause of the issue, could you please provide a screenshot of the device configuration within your CODESYS project, along with the CODESYS version used to develop the project?
Additionally, please note that the LAN-1 Ethernet port on the cMT-CTRL01 is dedicated to the CODESYS runtime. For EtherNet/IP communication with the iR-ETN, the device must be connected to LAN-1, as this is the interface used by CODESYS for network communication.
For additional troubleshooting steps, here are a few resources that may help: