The above error messages may indicate that there is a conflict between the Ethernet ports used for the host-target connection, and the one used to connect to the EtherCAT network. This may be due to incorrect settings in the EtherCAT Init block.
R2020a and earlier:
Ensure that all fields (such as "PCI Bus" and "PCI Slot") within the EtherCAT Init block are specified correctly, i.e., they match with the actual hardware setup.
R2020b and later:
Use the Ethernet Configuration utility (speedgoat.configureEthernet) which is part of Speedgoat I/O Blockset to reserve the correct Ethernet port for the EtherCAT Master:
If everything is specified correctly and the issue persists, please check that the network card(s) work.