US 12,476,799 B2
Constrained operation of a field device
Markus Sauer, Munich (DE); Tobias Aigner, Munich (DE); and Nejc Zupan, Munich (DE)
Assigned to SIEMENS AKTIENGESELLSCHAFT, Munich (DE)
Appl. No. 17/287,694
Filed by Siemens Aktiengesellschaft, Munich (DE)
PCT Filed Oct. 7, 2019, PCT No. PCT/EP2019/077091
§ 371(c)(1), (2) Date Apr. 22, 2021,
PCT Pub. No. WO2020/083630, PCT Pub. Date Apr. 30, 2020.
Claims priority of application No. 18202064 (EP), filed on Oct. 23, 2018.
Prior Publication US 2021/0399885 A1, Dec. 23, 2021
Int. Cl. H04L 9/08 (2006.01); G05B 19/042 (2006.01)
CPC H04L 9/0838 (2013.01) [G05B 19/0428 (2013.01); H04L 9/0825 (2013.01); H04L 9/085 (2013.01); G05B 2219/25205 (2013.01); G05B 2219/25428 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for operating a field device, the field device being configured for interacting with a control device, the method comprising:
receiving by the field device from a key generation device, a base key,
determining by the field device a current constraint parameter relating to a predefined operating constraint for operating the field device,
generating by the field device a further key based on the base key and the current constraint parameter, wherein the further key is generated by dynamically modifying the base key with the current constraint parameter,
interacting by the field device with the control device using the generated further key, wherein interacting includes communicating data between the field device and the control device using the generated further key, wherein the generated further key matches a key for the control device generated based on the predefined operating constraint,
in response to a change to the field device related to the predefined operating constraint, updating, by the field device, the generated further key so that the updated generated further key does not match the key for the control device, and as a function of the updating, the field device no longer interacts with the control device,
wherein the predefined operating constraint defines one or more constraints which must be fulfilled for operating the field device,
wherein a predefined function is executed by the field device when the current constraint parameter fulfills the predefined operating constraint, and
wherein the predefined function relates to a configuration and placing into operation of the field device issued by the control device.