The Binary Inputs button in the Preferences view of an added I/O communication module BPlus or I/O module supporting device profile CiA® 401 or CiA® 404 opens the Binary Inputs view.
Note that changes in this view are not saved and applied by the I/O module until you exit the view. Use the drop-down list to link the I/O module's binary inputs displayed in the Channel column to the desired function: