The EKS provides access control on PCs and control systems in an industrial environment. EKS basically comprises two components: an Electronic-Key and the matching Electronic-Key adapter. A memory chip and an antenna are built into the Electronic-Key (RFID transponder). The data carrier in the Electronic-Key is equipped with a combined read/write and fixed-code memory. The Electronic-Key locks into the Key adapter and is held there during operation of the installation. Due to the non-contact transfer of data, it was possible to design the Electronic-Key adapter from the access side with the high degree of protection IP 67, i.e. suitable for industry. Various data interfaces are available for the Electronic-Key adapter.