"By the action of the measurement unit on the connecting line, in one configuration, the transmission unit, and thus, consequently preferably, also the transmitter are shifted into a definable state and/or an error signal is transferred to the transmission unit. The transmission unit is generally an interface of the transmitter to the vicinity.
"In the case in which the measurement unit does not detect an error state, that therefore there is no error state, in one configuration, the measurement unit transfers a measurement signal which has been generated as a result of determining the measurement quantity to the transmission unit.
"One version for displaying of the error or for the associated shifting of the transmission unit or of the transmitter into a secured state lies in that, via the connecting line, a charging state of the transmitter is influenced such that charging state monitoring detects a charging state error. If the transmitter, for example, has an energy storage device, in one configuration, in the case of an error, it is discharged; this can be detected, for example, by a monitoring of the voltage. Discharging also has the advantage that the stored energy is no longer present so that the transmitter is in a low-energy, and therefore, a safe state.
"In one configuration, the measurement unit acts on the connecting line such that an energy value which has been tapped from the measurement unit is outside a definable region. For example, if a certain range is specified for the available voltage, a voltage demand outside this range indicates the presence of an error. The corresponding applies to the electrical current whose demand can, likewise, alternatively be set by the measurement unit. If, for example, the energy demand is increased, the measurement unit takes energy from the transmission unit or the transmitter and forces the transmission unit or the transmitter into a safe, i.e., de-energized or at least low-energy state relative to normal operation.
"In one alternative or supplementary configuration, the measurement unit acts on the connecting line such that the connecting line is interrupted. There is a switch for this purpose, for example.
"The aforementioned object is achieved according to another teaching of the invention in the initially named, especial safety or safety-relevant transmitter in that the measurement unit is made such that, in the case in which there is an error state, the measurement unit acts on the connecting line for transmission of energy. The measurement unit is made for transmission of the measurement signal which is produced based on the actual measurement with a sensor element to the transmission unit. Furthermore, the measurement unit allows the detection of the presence of an error in the transmitter or in the monitored process or in the hardware environment which is connected to the transmitter. The measurement unit and the transmission unit are connected for the transmission of data and energy, and the connection modalities can also coincide in a connection. In case of an error the measurement unit displays the error and in the error-free state preferably transmits the measured value or the generated measurement signal. For error display the measurement unit acts on the connecting line for transmission of energy.
"The measurement unit and the transmission unit of the transmitter in accordance with the invention preferably allow the sending and receiving of electrical signals, data and energy. There can be bidirectional or unidirectional links.
"If the transmitter is, for example, a two-wire measurement device, a current characteristic and/or voltage characteristic or a value as is outside the characteristics or values which occur in a normal case is set by the measurement unit at the signal output of the transmission unit, i.e., on the two-wire interface of the signal transmission element, for example, in the case of an error.
"In one configuration, the measurement unit is made such that the measurement unit is shifted into a definable state via action on the connecting line and/or an error signal is transferred to the transmission unit. In one configuration, there is at least one switch for opening and closing the connecting line for the action.
"The above described configurations of the method in accordance with the invention can also be used in the transmitter in accordance with the invention named here, i.e., the remarks made on the method apply accordingly here. Conversely, the configurations of the transmitter in accordance with the invention can also be used in the method and the remarks also apply accordingly to the implementation in the method in accordance with the invention.
"In particular, there are now a host of possibilities for embodying and developing the method in accordance with the invention and the transmitter in accordance with the invention. In this regard reference is made to the following description of exemplary embodiments in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
"FIG. 1 shows a schematic of a transmitter in accordance with the invention which illustrates essentially the active functional relationships using a block diagram, with a connection to a signal transmission element,
"FIG. 2 shows a schematic of another exemplary embodiment of a transmitter in accordance with the invention with an example for the shifting of the transmission unit into a definable state in case of an error, and
"FIG. 3 is a plot of a time characteristic of a voltage signal of a transmission unit of the exemplary embodiment of FIG. 2."
For additional information on this patent application, see: PICHOT, Vincent. Method for Monitoring a Transmitter and Corresponding Transmitter. U.S. Patent Application Serial Number 680431, filed
Keywords for this news article include: Electronics,
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