Device for reliable position monitoring
AssigneeDr. Johannes Heidenhain GmbH
InventorsMartin Pohl, Alfons Baumgartner, Frieder Kohler, Berhard Wastlhuber, Andreas Balleisen
Life of this patent
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Abstract
A position transducer is connected to merely one input circuit. The outputs of the input circuit are connected, transmitted or routed, in part, to a first and to a second counter circuit. For the counting process, the first counter circuit uses the digital signals of the input circuit, while the second counter circuit generates digital signals from the analog signals and uses them for the counting process. It is, thus, possible, in spite of a not fully two-channel processing of the signals of a position transducer, to set up a reliable position monitoring using only one position transducer.
Claims20
A device for secure position monitoring, comprising:
- a first counter circuit;
- a second counter circuit;
- an input circuit including a first subset of output signals A, B, DA, DB, DR connected in part to the first counter circuit and including a second subset of output signals A, B, R connected in part to the second counter circuit;
- and
- a position transducer including output signals A+, A−, B+, B−, R+, R− connected to the input circuit;
- wherein the second counter circuit is configured to form signals DA′, DB′, DR′ necessary for counting from the second subset of output signals of the input circuit.
A numerical control for controlling a machine tool, comprising:
- a secure position monitor device including:
- a first counter circuit;
- a second counter circuit;
- an input circuit including a first subset of output signals A, B, DA, DB, DR connected in part to the first counter circuit and including a second subset of output signals A, B, R connected in part to the second counter circuit;
- and
- a position transducer including output signals A+, A−, B+, B−, R+, R− connected to the input circuit;
- wherein the second counter circuit is configured to form signals DA′, DB′, DR′ necessary for counting from the second subset of output signals of the input circuit.
Dependencies are inferred from the claim text.