Method and system for secure data transmission
First Claim
1. A method for secure data transmission between at least a first and a second station of a communications system designed for serial data transmission between said stations, with the first station comprising a first evaluator and the second station comprising a second evaluator, the method comprising:
- transmitting a data report from the first station to the second station;
checking said data report by means of the second evaluator arranged in the second station;
transmitting an acknowledgement report from the second station to the first station depending on the results of the check of the data report; and
checking the acknowledgement report by means of the first evaluator arranged in the first station, wherein a redundant evaluation of safety-oriented data is performed, wherein said safety-oriented data serves to control safety-relevant processes of a machine or installation;
wherein in said evaluation the first and second evaluators respectively form one part of a corresponding pair of evaluators for achieving a shared redundancy,wherein each of the first and second evaluators is adapted to incorporate a functionality of the respective other evaluator; and
wherein said functionality comprises the ability to evaluate at least one of safety-oriented input data of a sensor and safety-oriented output data of an actuator.
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Accused Products
Abstract
A method and system are disclosed that secure data transmission in a communications system employed to control safety-relevant processes, through the provision of cooperating evaluators arranged in a shared manner in communications stations in order to evaluate safety-oriented data in a simple and cost-effective way. In the disclosed method, a data report is transmitted from a first station, by means of a communications system designed for serial data transmission, to a second station and said data report is checked by means of a second evaluator arranged in the second station. Depending on the results of the check of the data report, an acknowledgement report is transmitted from the second station to the first station, which acknowledgement report likewise is checked by the evaluator arranged in the first station. Furthermore, the disclosed system carries out the method.
17 Citations
32 Claims
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1. A method for secure data transmission between at least a first and a second station of a communications system designed for serial data transmission between said stations, with the first station comprising a first evaluator and the second station comprising a second evaluator, the method comprising:
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transmitting a data report from the first station to the second station; checking said data report by means of the second evaluator arranged in the second station; transmitting an acknowledgement report from the second station to the first station depending on the results of the check of the data report; and checking the acknowledgement report by means of the first evaluator arranged in the first station, wherein a redundant evaluation of safety-oriented data is performed, wherein said safety-oriented data serves to control safety-relevant processes of a machine or installation; wherein in said evaluation the first and second evaluators respectively form one part of a corresponding pair of evaluators for achieving a shared redundancy, wherein each of the first and second evaluators is adapted to incorporate a functionality of the respective other evaluator; and wherein said functionality comprises the ability to evaluate at least one of safety-oriented input data of a sensor and safety-oriented output data of an actuator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for transmission of safety-oriented data for control of an automation system, comprising:
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a serial communications system having at least a first and a second station connected thereto; a first evaluator arranged in the first station; and a second evaluator arranged in the second station, with the second evaluator being designed in order to check a data report received from the first station and in order to generate an acknowledgement report depending on the results of the check of the data report, the first evaluator being designed in order to check the acknowledgement report received from the second station, and with the first and/or second station being designed in order to execute a security function in the event of a fault; wherein the first and second evaluators respectively form one part of a corresponding pair of evaluators for achieving a shared redundancy; wherein the pair of evaluators are adapted to perform a redundant evaluation of safety-oriented data, wherein said safety-oriented data serves to control safety-relevant processes of a machine or installation, wherein each of the first and second evaluators is adapted to incorporate a functionality of the respective other evaluator; and wherein said functionality comprises the ability to evaluate at least one of safety-oriented input data of a sensor and safety-oriented output data of an actuator. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification