The invention relates substantially to a method for the assignment of industrial field devices to a user account in a cloud environment, comprising the following steps: logging in of a user in the cloud environment; scanning of the public identifier by the user by means of the mobile terminal of the user; checking, by means of the mobile terminal of the user by establishment of contact with the cloud environment, of whether the field device is already linked to a user account; connecting of the field device to the Internet by the user, provided such a connection does not yet exist, in such a way that the cloud environment can be contacted by the field device; triggering a linking of the field device by the user by means of the mobile terminal of the user and the previously scanned public identifier of the field device; authenticating of the field device in the cloud environment by means of the private security key of the field device and assigning of the field device to the public identifier by means of the c
