It would be nice to have a Etercat master card on the RMC200.
Controllers Delta can already be used for projects that mixte hydraulic actuators and electric actuators. In those situation we use dummy drives controlled through Delta analog outputs. But it would make a more modern setup to control them through Ethercat.
It would also allow Delta controllers to read/write to Ethercat remote I/Os in smaller projects that do not require a PLC.