ARRANGEMENT AND METHOD FOR OPERATING A FIELD DEVICE WITH A WEB SERVER

摘要

A method for operating a field device (F) that comprises a first web server (C1) and an internal memory unit (S1). To request data from the field device (F), a client (CL) in an operator unit (BG) sends an enquiry to the first web server (C1) via the first communication link (VI). The first web server (C1) transmits the data to the client (CL) if the data are present in the internal memory unit (S1). Otherwise, the first web server (C1) directs the enquiry to the second web server (C2) via the second communication link (V2), which reads the data from an external memory unit (S2) and sends them to the first web server (C1), with the first web server (C1) subsequently sending the data to the client (CL). It is therefore possible for data and functions of the field device (F) to be relocated to a second server (C2) having an external memory unit (S2) or database. The data may be e.g. parameter labels, error texts, help texts and menu labels in different languages. The values of the parameters that influence the measurement response (inputs) and the yield (outputs) must be stored in the memory unit (S1) that is internal in the field device (F).