Method for providing fail-safe secure data transmission between a numerical control system and a spatially separate unit
AssigneeDr. Johannes Heidenhain GmbH
InventorWalter Kranitzky
Life of this patent
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Abstract
A fail-safe system to connect a mobile input unit with a machine control unit, implementing a redundant preprocessing of the user inputs in the mobile input unit. The signals from the input means are routed to two processors of the input unit, and both processors encode the user inputs before transmitting the signals to the control unit. In the control unit, the received and encoded user inputs are decoded by two processors and subsequently compared to one another for concordance. When concordance is given, the received data is further processed in the control. If there is no concordance, an error routine is executed, shutting down the machine tool.
Claims10
A method for providing fail-safe transmission of data between a numerically controlled device and a spatially separate input unit, comprising:
- providing the data to at least two input processors of the input unit, which are independent of one another;
- encoding the data in the at least two input processors of the input unit using different encoding algorithms in each of the at least two input processors;
- transmitting the encoded data from the at least two input processors to a machine controller of the device;
- providing the encoded data to at least two control processors, corresponding to each of the at least two input processors;
- decoding the encoded data in the at least two control processors, using different decoding algorithms that are the inverse of the different encoding algorithms;
- and
- checking for parity the decoded data and executing an error routine in response to a result of non-parity.
Dependencies are inferred from the claim text.