Abstract: A display and operating unit having a web application for operating a field instrument and a method of operating a field instrument having a display and operating unit having a web application, wherein the display and operating unit is connectable to the field instrument; wherein at least one parameter of the field instrument is visualized on the display and operating unit by means of the web application and a parameterization of the field instrument s made possible and the web application for the visualization and/or parameterization is executed in a browser; wherein the browser is executed on the display and operating unit; and wherein the browser and/or the web application has/have an interface with which direct access to components or operating system components of the display and operating unit, to components of the field instrument and/or to external units is carried out.

Abstract: An apparatus and method for connecting a mobile device having a field device via a wireless LAN access point includes a server having a web service. The field device has a first module for generating a wireless LAN key and the server has a web service having a second module for generating a wireless LAN key. The first module and the second module respectively generate identical wireless LAN keys. The field device is identified by the mobile device by means of at least one piece of identification information. The mobile device transmits the identification information of the field device to the server having the web service. The server transmits the wireless LAN keys associated with the identification information to the mobile device. The mobile device is wirelessly connected via the wireless LAN access point to the field device by means of a wireless LAN name and the wireless LAN key.

Abstract: A method having a search program (15) and a search box (5) for searching and locating parameters (2) and/or process data (3) in a web application (4) which is provided for operating and visualizing at least one field instrument (1), wherein the web application (4) for the search dynamically produces the parameters (2) and/or process data (3) from an operating interface (6) at the running time, with the operating interface (6) having at least one searchable data structure (7).

Abstract: The invention relates to a method of offline instrument simulation of a field instrument, wherein at least one parameter of the field instrument is visualized and a parameterization of the field instrument is made possible and the instrument simulation is generated on the basis of an instrument description file, and wherein the instrument simulation is performed in a browser.