Method for updating device descriptions for field devices in process automation technology

1. A method for updating device descriptions for different field devices, sensors or actuators, for determining and influencing process variables in process automation technology, whereby the field devices are connected via a field bus,

whereby in each case a device description describes the functionality of the corresponding field device in a standardized language and

whereby a control unit and an external server are employed, and

whereby from the control unit a process activity is controlled or monitored and from which direct access to individual field devices is possible,

wherein data transfer between the field devices and the control unit is carried out according to an international standard for field buses, comprising the steps:

storing preconfigured device descriptions for specific applications of the field devices on a central server connected to the field bus via Internet,

storing and running an application program in the control unit for servicing, configuring, parameterizing, or troubleshooting the field device, which application program requires device descriptions for field devices for its operation;

downloading from the central server via the internet, by the application program in the control unit, the preconfigured device description of the corresponding field device to be serviced;

wherein following a query of the device type of the field device corresponding device information for servicing the field device is downloaded from the central server.

2. The method as claimed in claim 1 wherein in the case that a preconfigured version of the device description of the field device is not available in the control unit the necessary device descriptions are downloaded via the internet from the central server.

3. The method as claimed in claim 1 wherein the most up-to-date device descriptions are stored on the central server.

4. The method as claimed in claim 1 wherein the updated device information is only downloaded from the central server when the device information saved in the control unit differentiates from that stored in the field device.

5. The method as claimed in claim 1 wherein following appropriate selection by a user preconfigured device descriptions for specific applications of a field device which are stored on the central server are loaded from the application program.

6. The method as claimed in claim 1 wherein the device descriptions on the central server are stored in respective national language.

7. The method as claimed in claim 1 wherein a current firmware for specific field devices are downloaded from the central server as well.

8. The method as claimed in claim 1 wherein as a result of the query of the application program specific information of various field devices and various users is transferred to the central server.