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US 7,890,300 B2Granted
Method for monitoring a field device
AssigneeEndress + Hauser Process Solutions AG
InventorsVincent De Groot, Philipp Zumoberhaus
Life of this patent
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Abstract
A method for monitoring a field device connected via a data bus with a control unit. To prevent unauthorized tampering with the field device, the control unit requests, at intervals of time, an individual identifier of the field device. The requested individual identifier is compared with an identifier stored in the control unit. An alarm is produced or a warning, in the case of a change in the requested individual identifier.
Claims13
A method for monitoring a field device connected via a data bus with a control unit, comprising the steps of:
- using the control unit to request at intervals in time, an individual identifier of the field device;
- comparing the requested individual identifier of the field device with an identifier stored in the control unit, for indicating an unauthorized tampering with the field device based on the unauthorized replacement or change of hardware has occurred, or software, or even just parts thereof in the field device;
- and
- producing an alarm or a warning, in the case of a change in the requested individual identifier.
1 more element
The method as claimed in 3, wherein:
- the individual identifier is a test sum of a memory unit in the field device.
Dependencies are inferred from the claim text.