Abstract:
A method for safe data communication via WAN, LAN (e.g. Internet) between at least one external access unit and a field device, or a field bus adapter for determining or monitoring at least one physical or chemical process parameter. According to the method unauthorized accessing of a field device, or a field bus adapter, in the field is blocked in that the operator of the field device or the field bus adapter permits the external access unit to have targeted access to the field device, or the field bus adapter.
Abstract:
A method and an apparatus are presented for selectively locking controls from operators operating equipment. The invention actively detects when an operator accesses a control for which lockout is desired. After detection, the invention locks the control to prevent the operator from operating the control. Thus, operators are permitted selective access to controls. The active detection of when an operator is accessing a control is performed by first generating a signal, which is passed to a plate, where it is then coupled through the operator to a receiver. The signal is detected at a signal detector attached with a control so the control can react to the signal. In an automotive situation, the plate may be in a vehicle seat, with the signal coupling through a driver or passenger upon actuation of a control. Based on the signal received, the function of the control may be eliminated, altered, or reduced.
Abstract:
A method and an apparatus are presented for selectively locking controls from operators operating equipment. The invention actively detects when an operator accesses a control for which lockout is desired. After detection, the invention locks the control to prevent the operator from operating the control. Thus, operators are permitted selective access to controls. The active detection of when an operator is accessing a control is performed by first generating a signal, which is passed to a plate, where it is then coupled through the operator to a receiver. The signal is detected at a signal detector attached with a control so the control can react to the signal. In an automotive situation, the plate may be in a vehicle seat, with the signal coupling through a driver or passenger upon actuation of a control. Based on the signal received, the function of the control may be eliminated, altered, or reduced.
Abstract:
A pressure measuring device is provided, offering a high measure of safety and having a measuring element and a pressure transmitter connected in series before the measuring element. The pressure transmitter has a first membrane, and a second membrane arranged directly on a side of the first membrane facing away from the measuring element and extending parallel to the first membrane (11). A monitoring unit of the pressure measuring device monitors an intermediate space bounded by the first and second membranes for changes caused by a destruction of the second membrane.