The Wago Fieldbus Coupler is designed for applications with a low data width in the process image. These are primarily applications that use digital process data or only low volumes of analog process data. The system supply is provided directly by the coupler. The field supply is provided via a separate supply module. The CANopen Fieldbus Coupler detects all connected I/O modules and creates a local process image. The local process image is divided into two data zones containing the data received and the data to be sent. The process data can be sent via the CANopen bus to a control system for further processing. The process output data is sent via the CANopen bus.