Method for secure communication between a field device in automation technology and a terminal and a system for secure communication between a field device and a terminal

摘要

A method (1) for secure communication between a field device (2) in automation technology and a terminal device (5) connected to the field device (2) via a terminal device communication link (4) is shown and described, the field device (3) having a physical process (6) and the field device (3) via a fieldbus interface (7) with other field devices (3a, 3b, 3c, 3d) and / or a process control system (8) can be brought into connection for the exchange of process information Improper access to the field device by means of the terminal device communication interface is prevented with a high degree of security in that an individual access identifier (10) is stored in the terminal device (5) and the terminal device (5) transmits its access identifier (10) to the field device (3) (11) that the field device (3) is connected to an authentication server (13) via a server communication connection (12) and the field device (3) the access identifier (10 ) or an access identifier (10 ') derived from the access identifier (10) to the authentication server (13) transmits (14) that authentication data (15) are stored on the authentication server (13) on the basis of which the authenticity of the access identifier (10) the authentication server (13) is checked (16), and that the resulting authentication result (17) is transmitted (18) from the authentication server (13) via the server communication connection (12) to the field device (3) and that depending on the The authentication result (17) transmitted to the field device (3) is made available (19) to the terminal device (5) with resources of the field device (3).