The X20 I/O system bus controller makes it possible to implement OPC UA communication from the sensor layer to the ERP layer without an interface. The X20BC008U bus controller functions as an OPC UA server and provides all information about connected I/O modules to OPC UA clients from any manufacturer. This includes controllers, SCADA systems, ERP systems or cloud applications. All production process data is transferred using a single protocol. With the publish-subscribe model (Pub/Sub), data can be distributed efficiently. The bus controller can be used with all controllers and I/O modules from the X20 and X67 product lines without limitations.