The WAGO Fieldbus Coupler connects the WAGO I/O System as a slave to the PROFIBUS fieldbus. The fieldbus coupler detects all connected I/O modules and creates a local process image. This process image may include a mixed arrangement of analog (word-by-word data transfer) and digital (bit-by-bit data transfer) modules. The process image can be transferred via the PROFIBUS fieldbus to the memory of the control system.