Abstract: A rail-mounted device for automation systems having at least one local bus interface for connecting the rail-mounted device to a local bus of an automation system, and a power supply unit that has at least one input and at least one output through which the power supply unit is connectable to at least one electronic control unit of the automation system. The power supply unit of the rail-mounted device is equipped to detect a voltage drop or a loss of voltage at the input of the power supply unit and to provide a supply voltage at a minimum of one output of the power supply unit over a limited period by means of the electrical energy stored in the energy storage device. The rail-mounted device has at least one signal output for indicating a voltage drop or voltage loss detected at the input of the power supply unit.

Abstract: A method for transferring a digital file from an OPC VA server to an OPC VA client that is executed in a web browser as a web application, wherein an OPC VA file module is used to open the desired file on the OPC VA server, the digital data included therein are read using the OPC VA communication protocol and subsequently the open file is closed again. From the read digital data, a file is then formed that is a copy of the file to be transferred, the file formed then being provided to the web browser of the client as a file download.

Abstract: A method for transferring a digital file from an OPC VA server to an OPC VA client that is executed in a web browser as a web application, wherein an OPC VA file module is used to open the desired file on the OPC VA server, the digital data included therein are read using the OPC VA communication protocol and subsequently the open file is closed again. From the read digital data, a file is then formed that is a copy of the file to be transferred, the file formed then being provided to the web browser of the client as a file download.