Method for monitoring a transmitter and corresponding transmitter
First Claim
1. A method for monitoring a transmitter having a measurement unit, a transmission unit, a connecting line, and a signal transmission element that is part of a field bus, the measurement unit and the transmission unit being interconnected at least for transmission of signals and being connected by the connecting line for supplying power from the transmission unit to the measurement unit,comprising the steps of:
- using the measurement unit to determine a measurement quantity and to produce a measurement signal which is dependent on the determined measurement quantity,using the transmission unit to receive the measurement signal from the measurement unit and to transfer an output signal in converted form to the signal transmission element based on the measurement signal,tapping signal from the signal transmission element and supplying the signal that has been tapped back to the transmission unit for transmission back to the measurement unit as a comparison signal,inducing from the transmission unit, a determination of the measurement quantity by the measurement unit,transferring the comparison signal, which corresponds to the signal tapped from the transmission element and input to the transmission unit from the transmission element, to the measurement unit,comparing the comparison signal with a stored signal and producing a comparison result, anddepending on the comparison result, either the measurement signal which has been generated following the determination of the measurement quantity is transferred from the measurement unit to the transmission unit if a positive comparison result is produced or an error signal is transferred from the measurement unit to the transmission unit by acting on the connecting line if a negative comparison result is produced.
1 Assignment
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Accused Products
Abstract
A method for monitoring a transmitter (1) with a measurement (2) and a transmission unit (3), with which a measurement (2) signal is generated that is dependent on a measurement quantity, and with the transmission unit (3) receiving the measurement signal, and based on the measurement signal, an output signal is transferred to a signal transmission element (4). To makes it possible to recognize an error, an input signal is taken from the signal transmission element (4) and is transferred to the measurement unit (2) as a comparison signal which corresponds to the input is compared with a stored signal and based upon the outcome of the comparison, either the measurement signal is transferred from the measurement unit (2) to the transmission unit (3) or the transmission unit (3) is shifted into a definable state and an error signal is transferred to it.
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Citations
7 Claims
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1. A method for monitoring a transmitter having a measurement unit, a transmission unit, a connecting line, and a signal transmission element that is part of a field bus, the measurement unit and the transmission unit being interconnected at least for transmission of signals and being connected by the connecting line for supplying power from the transmission unit to the measurement unit,
comprising the steps of: -
using the measurement unit to determine a measurement quantity and to produce a measurement signal which is dependent on the determined measurement quantity, using the transmission unit to receive the measurement signal from the measurement unit and to transfer an output signal in converted form to the signal transmission element based on the measurement signal, tapping signal from the signal transmission element and supplying the signal that has been tapped back to the transmission unit for transmission back to the measurement unit as a comparison signal, inducing from the transmission unit, a determination of the measurement quantity by the measurement unit, transferring the comparison signal, which corresponds to the signal tapped from the transmission element and input to the transmission unit from the transmission element, to the measurement unit, comparing the comparison signal with a stored signal and producing a comparison result, and depending on the comparison result, either the measurement signal which has been generated following the determination of the measurement quantity is transferred from the measurement unit to the transmission unit if a positive comparison result is produced or an error signal is transferred from the measurement unit to the transmission unit by acting on the connecting line if a negative comparison result is produced. - View Dependent Claims (2, 3, 5, 6, 7)
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4. A transmitter, comprising:
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a signal transmission element that is part of a field bus, a measurement unit for determining a measurement quantity and producing a measurement signal which is dependent on the measurement quantity determined, a transmission unit that is interconnected with the measurement unit at least for transmission of signals, and being adapted for receiving the measurement signal from the measurement unit and transferring an electrical output signal to the signal transmission element based on the measurement signal, a connecting line for transmitting energy between the measurement unit and the transmission unit, and a storage unit, wherein the transmission unit is adapted for inputting an electrical signal taken from the signal transmission element and to transfer a comparison signal, which is dependent on the signal input from the signal transmission element, to the measurement unit, wherein the transmission unit and the measurement unit are constructed and matched to one another such that the transmission unit is able to induce a determination of the measurement quantity by the measurement unit, wherein the measurement unit is made to transmit the measurement signal to the transmission unit and to receive the comparison signal from the transmission unit, wherein the measurement unit has at least one comparison unit, wherein the comparison unit is adapted to compare the comparison signal to a signal stored in the storage unit, and to produce a comparison result based thereon, and wherein the measurement unit depending on the comparison result transfers either the measurement signal to the transmission unit or transfers an error signal to the transmission unit by acting on the connecting line so as to set an energy demand outside of a given normal range.
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Specification