Automation System and Method for Error-Protected Acquisition of a Measured Value
AssigneeSiemens Aktiengesellschaft
InventorsThomas Kahabka, Johannes Mueller
Life of this patent
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Abstract
A method for error-protected acquisition of a measured value in a control unit, wherein the measured value is firstly acquired with a first acquisition device and secondly with a second acquisition device and thereby a first measured value and a second measured value are made available, where in a comparison step in a safety program executing in the control unit, the first and the second measured value are compared with one another for a deviation from one another and upon reaching or exceeding a pre-determined maximum deviation, an error is identified.
Claims14
A method for error-protected acquisition of a measured value in a control unit, the measured value being firstly acquired with a first acquisition device and secondly with a second acquisition device such that a first measured value and a second measured value are made available, during a comparison in a safety program executing in the control unit, the first and the second measured value being compared with one another for a deviation from one another and upon reaching or exceeding a pre-determined maximum deviation, an error being identified, the method comprising:
- parameterizing the first acquisition device for a first measurement range to be set;
- parameterizing the second acquisition device for a second measurement range to be set;
- re-parameterizing alternatingly, aided by the safety program, the measurement range for the second acquisition device in the safety program, based on information regarding how the second acquisition device is currently parameterized, such that a currently set second measurement range is known and it is therefore known in which range the second measured value must lie;
- and
- performing a plausibility check between the first measured value and the second measured value;
- wherein if the plausibility check result is negative, an error is also identified.
An automation system configured for error-protected acquisition of a measured value, comprising:
- a first acquisition device configured to acquire a first measured value;
- a second acquisition device configured to acquire a second measured value;
- and
- a control unit which executes a safety program provided with the safety unit, the a safety program comparing the first and the second measured values with one another for a deviation from one another and upon reaching or exceeding a pre-determined maximum deviation, identifying an error;
- wherein the first acquisition device is set for a first measurement range to be set and the second acquisition device is alternatingly re-parameterizable aided by the safety program in a second measurement range to be set;
- wherein the safety program has knowledge regarding a currently set second measurement range;
- wherein the safety program is further configured to perform a plausibility check between the first measured value and the second measured value;
- and
- wherein the safety program is further configured to perform the plausibility check aid by knowledge of a value range to be expected within which the second measured value must lie and is further configured, in an event of a negative plausibility check result, to also signal an error.
Dependencies are inferred from the claim text.