Diagnostic circuit for monitoring an analog-digital converter circuit
First Claim
1. A diagnostic circuit for monitoring an analog-digital converter circuit during an input of a measured value of at least one of a level gauge, a pressure gauge and a flowmeter, comprising:
- a multiplexer selecting different signals;
a first microcontroller controlling at least the multiplexer;
wherein a supply voltage is provided for the microcontroller; and
wherein the diagnostic circuit is configured to detect a change in the supply voltage on the basis of a comparison of the supply voltage with a stored supply voltage reference value of the supply voltage by utilizing the multiplexer and the first microcontroller.
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Accused Products
Abstract
Described is monitoring of an analog-digital conversion of a measured value of at least one of a pressure gauge, a level gauge and a flowmeter. Different measured values can be provided for the analog-digital converter by means of a first microcontroller, wherein these measured values are subsequently transmitted from this first area into a second area by means of a unidirectional coupler. These values are acquired by a second microcontroller in the second area and compared with reference values that are stored in the second area or at another location. This diagnostic circuit may make it possible to detect drifts of resistances and of reference voltages, as well as a faulty analog-digital converter or a program execution error of the first microcontroller.
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Citations
14 Claims
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1. A diagnostic circuit for monitoring an analog-digital converter circuit during an input of a measured value of at least one of a level gauge, a pressure gauge and a flowmeter, comprising:
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a multiplexer selecting different signals; a first microcontroller controlling at least the multiplexer; wherein a supply voltage is provided for the microcontroller; and wherein the diagnostic circuit is configured to detect a change in the supply voltage on the basis of a comparison of the supply voltage with a stored supply voltage reference value of the supply voltage by utilizing the multiplexer and the first microcontroller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An arrangement, comprising:
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a diagnostic circuit including a multiplexer selecting different signals and a first microcontroller controlling at least the multiplexer, wherein a supply voltage is provided for the microcontroller and wherein the diagnostic circuit is configured to detect a change in the supply voltage on the basis of a comparison of the supply voltage with a stored supply voltage reference value of the supply voltage by utilizing the multiplexer and the first microcontroller. - View Dependent Claims (13)
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14. A method for monitoring an analog-digital converter circuit during an input of a measured value of at least one of a level gauge, a pressure gauge and a flowmeter, comprising:
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supplying a microcontroller with a supply voltage, the microcontroller being configured control at least the multiplexer, the multiplexer being configured to select different signals; measuring the supply voltage; comparing the measured supply voltage with a stored supply voltage reference value of the supply voltage; and detecting a change in the supply voltage on the basis of the comparison.
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Specification