The PR100073 ETHERCAT from Kunbus GmbH is a protocol converter. It allows communication between networks of different protocols by pairing different gateway modules. For example, it can pair to PR10006 as the Ethernet/IP Gateway module.
Confirmed by the supplier, PR100073 is a Slave only and cannot be a master without any basis module e.g. RevPi Core or RevPi CONNECT. The basis module can be configured as a soft-master, e.g with installed codesys PR100337.
The operation Information and video of this series can be found here: KUNBUS Modular Gateways