The Beckhoff original PLC control module BK1120 is a bus coupler module used in the Beckhoff EtherCAT system. It serves as a connection point between the EtherCAT fieldbus and the local I/O modules within the system.

The BK1120 module allows for the integration of various I/O modules, such as digital inputs, digital outputs, analog inputs, and analog outputs, depending on the specific requirements of the application. It offers seamless communication between the I/O modules and the EtherCAT network, enabling real-time data exchange and synchronized operation.

The BK1120 bus coupler module is designed to be mounted on a DIN rail and features a compact, space-saving design. It provides system diagnostics and supports automatic addressing and configuration of the connected I/O modules. The module also offers protection against overvoltage, short circuits, and reverse polarity, ensuring the safety and reliability of the system.

Overall, the Beckhoff BK1120 PLC control module is a crucial component in the Beckhoff EtherCAT system, facilitating efficient and reliable control and automation in various industrial applications.