Patent ID: 7657492

Claim:
A method to perform safety-relevant operations at a technical unit, comprising: providing a Human Machine Interface (HMI) system with at least one mobile control and monitoring device for automation components of a technical unit, wherein a data transmission between the mobile control and monitoring device and the automation components is contactless; providing a manual device for releasing or blocking safety-relevant operations of the technical unit; providing a locating device for locating the mobile control and monitoring device; providing an evaluation device to manage an active operating area, and to activate the automation components for safety-relevant operations of the technical unit via the mobile control only when the manual device is released by an operator and the locating means detects that the mobile control and monitoring device is located inside an active operating area; and generating a warning signal when the mobile control and monitoring device is in a warning area located outside the active operating area, wherein the manual release of safety-relevant operations is performed by an operator, wherein the manual release is a precondition for them being activated.