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US 7,643,639 B2Granted
Process automation system and process device for a process automation system
AssigneeSiemens Aktiengesellschaft
InventorsAndreas Kaszkin, Wolfgang Stiehl
Life of this patent
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Abstract
A process automation system in which process devices (1-6) execute predetermined functions as part of the process automation and exchange data (23, 24) relevant to functions and/or devices with the process automation system. Some but not all of the data (23, 24) are exchanged in encrypted form.
Claims6
A process automation system, comprising:
- process devices that execute predetermined functions as part of the process automation and thereby exchange data that are relevant to at least one of the functions and the devices within the process automation system,
- wherein some but less than all of the data are exchanged in encrypted form,
- wherein, in at least a first of the process devices, a communication device determines by hard wiring or programming which of transmission data are encrypted in an encryption device of the first process device, and
- wherein, in at least a second of the process devices, the communication device recognizes which of reception data are encrypted and decrypts the reception data in a decryption device of the second process device.
1 more element
Dependencies are inferred from the claim text.