A method for operating a field device by means of a control unit

A method for operating a field device (F1) by means of a, preferably hand-held, the operating unit (B), wherein by means of a client application on the operating unit (B) identification information (N1, P1, ID0) of a user (N) and / or the operating unit ( B) (at a higher-level unit e) are submitted for authentication, in particular by input by the user, wherein (from the higher-level unit e) in response to identification information (ID1, ID2, ID3) of the to-use field device (F1, F2, F3), the means of the client application (on the operating device B) are transmitted to the superordinate unit (e), an access authorization (AB, AF1, Af2, ASR, AC, AD) or access denial for the field device or at least one field devices function from the parent unit (e) to the client application on the operating unit (B) is transmitted.