Access control system for controlling access of a user to one or more operating functions of a technical installation

An access control device for controlling access by a user to one or more operating functions of a technical installation, the access control device comprising:

• an interface configured to receive dynamic access authorization data from a receiving device, which reads access authorization data from a mobile data medium continuously, continuously generates a dynamic portion, and continuously adds the dynamic portion to the access authorization data to obtain the dynamic access authorization data;
• and
• a processing unit configured to validate the access authorization data,
• wherein the access control device is configured to, in response to the dynamic portion of the dynamic access authorization data corresponding to a defined expectation, generate an enable signal for those operating functions of the technical installation for which the access authorization data is valid.

An access control method for controlling access of a user to one or more operating functions of a technical installation, the access control method comprising:

• reading, at a receiving device, access authorization data from a mobile data medium continuously;
• at the receiving device, continuously generating a dynamic portion;
• at the receiving device, adding the dynamic portion to the access authorization data to obtain dynamic access authorization data;
• sending the dynamic access authorization data from the receiving device to an access control device;
• at the access control device, receiving, the dynamic access authorization data;
• and
• in response to the dynamic portion of the dynamic access authorization data corresponding to a defined expectation, generating, at the access control device, an enable signal for those operating functions of the technical installation for which the access authorization data is valid.