The EJ series EtherCAT plug-in modules allows platform concepts to be implemented in large-scale machine production. The series offers many common components but maintains the ability to configure different variants. The modules feature the performance and functionality of the EtherCAT I/O system, while their design enables them to be attached directly to circuit boards. The circuit board used with the series is an application-specific signal distribution board that transmits signals and power to individual application-specific plug connectors to connect the controller to machine modules as required. Prefabricated plug-and-work cable harnesses replace the manual wiring processes common in control cabinet construction.