EP0883097A2 - Device for transmitting signals between a transmitter and a receiver - Google Patents
Device for transmitting signals between a transmitter and a receiver Download PDFInfo
- Publication number
- EP0883097A2 EP0883097A2 EP98109740A EP98109740A EP0883097A2 EP 0883097 A2 EP0883097 A2 EP 0883097A2 EP 98109740 A EP98109740 A EP 98109740A EP 98109740 A EP98109740 A EP 98109740A EP 0883097 A2 EP0883097 A2 EP 0883097A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- transmitter
- current
- point
- measured value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage
Definitions
- the invention relates to an arrangement for signal transmission between a donor station and a receiving station, which are connected to each other by a two-wire line over which a variable between two limit values analog signal current is transmitted that one in represents the measured value detected by a sensor and that required for the operation of the donor agency Supply current forms, with the encoder unit a circuit has a constant operating voltage for the Generated donor position, and one in the donor position controllable power source is provided, which over the Two-wire current flowing depending on the Measured value determined.
- the invention is therefore based on the object To design the arrangement of the type specified at the beginning, that the power available in the encoder is optimized becomes.
- the one that generates the operating voltage for the encoder Circuit is a switching regulator, and that in the encoder position a voltage source is provided, the output voltage changes opposite to the signal current and which the Input voltage of the step-down switching regulator forms.
- the switching regulator used in the arrangement according to the invention has the property that he applies the to him Converts input voltage into a constant output voltage, where, apart from internal losses, its output power equal to its performance on the input side is. This can increase the available input power be that its input voltage by changing the Output voltage of the voltage source opposite to Measured value is changed. In the presence of a low Measured value, which accordingly also a low signal current is the input voltage of the switching regulator increased while at a large reading, accordingly also results in a large signal current is reduced.
- From DE-C-39 34 007 is the use of a switching regulator to generate the supply voltage for a Transducer circuit and a sensor known, but it is with this known arrangement, the input voltage is not possible of the switching regulator to influence the available Affect performance.
- FIG. 1 shows schematically a transmitter point 10 which is connected to a receiving point 12 via a two-wire line 14.
- the transmitter point 10 is a measuring point in which a measured value (for example temperature, pressure, humidity, fill level, flow) is detected with the aid of a sensor 16.
- the encoder point 10 does not contain its own energy source, but obtains the supply current required for its operation via the two-wire line 14 from a voltage source 18 contained in the receiving point 12 14 transferred.
- the measured value signal is a signal current I S flowing over the two-wire line 14, which can change between two predetermined values (usually the current values 4 mA and 20 mA).
- the voltage source 18 supplies a direct voltage and the measuring current I S is a direct current.
- the transmitter 10 already contains the data acquisition mentioned sensor 16 and a transducer circuit connected to it 20, the outputs 22 and 24 two each outputs detected measured value signals. The purpose these two signals will be explained later.
- the receiving point 12 contains an evaluation circuit 26 which obtains the measured value information from the signal current I S transmitted via the two-wire line 14.
- a measuring resistor 28 is inserted into the two-wire line, at which a voltage U M is generated which is proportional to the signal current I S transmitted via the two-wire line and which is fed to the evaluation circuit 26.
- a resistor 30 is also shown in the receiving point 12, which, in addition to the resistor 28, represents the load which is on the two-wire line 14 on the receiver side.
- the signal current I S is set in the transmitter 10 by a controllable current source 32, to which the signal emitted by the transducer circuit 20 at the output 24 is supplied as a control signal for the signal current I S to be determined. Depending on the measured value recorded in each case, the signal current I S flowing in the two-wire line is determined by a corresponding control of the current source 32.
- the donor station contains 10 a controllable voltage source 34 and a switching regulator 36, whose task is to maintain a constant operating voltage for the transducer circuit 20 and the sensor 16 too produce.
- the input voltage for the switching regulator 36 is supplied by the voltage source 34, the value of the Output voltage of this voltage source 34 with the help of the transducer circuit 20 at the output 22 signal can be controlled.
- the use of the switching regulator 36 in connection with the controllable voltage source 34 makes it possible to always provide the measuring transducer circuit 20 and the sensor 16 with the highest possible power.
- the switching regulator 36 ensures that, despite an increase in its input voltage, the operating voltage of the transducer circuit 20 and the sensor 16 is kept at a constant value, so that a higher input power is available by increasing the input voltage on the switching regulator 36, which therefore also has a allows higher output power.
- the signal current I S also assumes the lower value of the signal current range, in the example given above, the value of 4 mA, so that the input power at the switching regulator 36 also has a low value Value would assume, since it is formed by the product of signal current and input voltage.
- the output voltage of the voltage source 34 can be increased by the control signal from the transducer circuit 20, so that the power available at the input of the switching regulator 36 is also increased. This increased power is then also available for the operation of the transducer circuit 20 and the sensor 16.
- the control voltage from the transducer circuit 20 is used to reduce the input voltage generated by the voltage source 34 at the input of the switching regulator 36, because in this case because of the high Signal current I S enough power for the operation of the transducer circuit 20 and the sensor 16 is available.
- the limits within which the voltage set by the voltage source 34 can be changed depending on the measured value detected in each case depends on several factors, such as the output voltage of the supply voltage source 18, the load formed in the measuring resistor 28 and the resistor 30 in the receiver point 12 and on the minimum Terminal voltage U K from which must be present at the encoder point 10 for its proper operation.
- FIG. 2 shows a diagram which shows how the voltage U e generated by the voltage source 34 and the signal current I S change depending on the measured value M.
- the measured value M is shown standardized; its smallest value has the standardized value 0 and its largest value has the standardized value 1.
- the signal current I S has the value 4 mA for the minimum measured value and 20 mA for the maximum measured value.
- the input voltage U e changes from 12 V at the minimum measured value to 10 V at the maximum measured value.
- FIG. 3 shows a further embodiment of the arrangement to be described here.
- the voltage source 34 is not controlled by an output signal of the transducer circuit 20, but rather directly by the terminal voltage U k at the transmitter point.
- This terminal voltage can be used for this purpose, since it is also clearly related to the measured value detected by the sensor 16, which leads to the setting of the signal current I S.
- the signal current I S which also flows in the receiver station 12, in turn determines the terminal voltage U k on the basis of the voltage drops in the receiver station.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine Anordnung zur Signalübertragung zwischen einer Geberstelle und einer Empfangsstelle, die miteinander durch eine Zweidrahtleitung verbunden sind, über die ein zwischen zwei Grenzwerten veränderlicher analoger Signalstrom übertragen wird, der einen in der Geberstelle von einem Sensor erfaßten Meßwert repräsentiert und den für den Betrieb der Geberstelle erforderlichen Versorgungsstrom bildet, wobei die Geberstelle eine Schaltung aufweist, die eine konstante Betriebsspannung für die Geberstelle erzeugt, und wobei in der Geberstelle eine steuerbare Stromquelle vorgesehen ist, die den über die Zweidrahtleitung fließenden Strom in Abhängigkeit von dem Meßwert bestimmt. The invention relates to an arrangement for signal transmission between a donor station and a receiving station, which are connected to each other by a two-wire line over which a variable between two limit values analog signal current is transmitted that one in represents the measured value detected by a sensor and that required for the operation of the donor agency Supply current forms, with the encoder unit a circuit has a constant operating voltage for the Generated donor position, and one in the donor position controllable power source is provided, which over the Two-wire current flowing depending on the Measured value determined.
Eine Anordnung dieser Art ist aus der EP-A-0 744 724 bekannt. Bei dieser bekannten Anordnung sind keine Maßnahmen getroffen, die es ermöglichen könnten, die in der Geberstelle dem Sensor und dessen Meßwandlerschaltung zur Verfügung gestellte Leistung zu optimieren. Die Betriebsspannung der Geberstelle wird vielmehr stets auf einem konstanten Wert gehalten, so daß abhängig von dem gerade fließenden Signalstrom mehr oder weniger Leistung für die interne Versorgung in der Geberstelle zur Verfügung steht.An arrangement of this type is known from EP-A-0 744 724. In this known arrangement there are no measures taken that could enable those in the donor agency the sensor and its transducer circuit for To optimize the performance provided. The operating voltage rather, the donor office is always on one held constant so that depending on the straight flowing signal current more or less power for that internal supply is available in the donor station.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Anordnung der eingangs angegebenen Art so auszugestalten, daß die in der Geberstelle verfügbare Leistung optimiert wird.The invention is therefore based on the object To design the arrangement of the type specified at the beginning, that the power available in the encoder is optimized becomes.
Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß die die Betriebsspannung für die Geberstelle erzeugende Schaltung ein Schaltregler ist, und daß in der Geberstelle eine Spannungsquelle vorgesehen ist, deren Ausgangsspannung sich entgegengesetzt zum Signalstrom ändert und die die Eingangsspannung des Abwärts-Schaltreglers bildet.This object is achieved according to the invention in that the one that generates the operating voltage for the encoder Circuit is a switching regulator, and that in the encoder position a voltage source is provided, the output voltage changes opposite to the signal current and which the Input voltage of the step-down switching regulator forms.
Der in der erfindungsgemäßen Anordnung verwendete Schaltregler hat die Eigenschaft, daß er die an ihn angelegte Eingangsspannung in eine konstante Ausgangsspannung umsetzt, wobei, abgesehen von internen Verlusten, seine Ausgangsleistung gleich seiner eingangsseitig vorhandenen Leistung ist. Die verfügbare Eingangsleistung kann dadurch erhöht werden, daß seine Eingangsspannung durch Verändern der Ausgangsspannung der Spannungsquelle entgegengesetzt zum Meßwert verändert wird. Bei Vorhandensein eines niedrigen Meßwerts, der demgemäß auch einen niedrigen Signalstrom ergibt, wird daher die Eingangsspannung des Schaltreglers erhöht, während sie bei einem großen Meßwert, der demgemäß auch einen großen Signalstrom ergibt, verringert wird.The switching regulator used in the arrangement according to the invention has the property that he applies the to him Converts input voltage into a constant output voltage, where, apart from internal losses, its output power equal to its performance on the input side is. This can increase the available input power be that its input voltage by changing the Output voltage of the voltage source opposite to Measured value is changed. In the presence of a low Measured value, which accordingly also a low signal current is the input voltage of the switching regulator increased while at a large reading, accordingly also results in a large signal current is reduced.
Aus der DE-C-39 34 007 ist zwar die Verwendung eines Schaltreglers zur Erzeugung der Versorgungsspannung für eine Meßwandlerschaltung und einen Sensor bekannt, jedoch ist es bei dieser bekannten Anordnung nicht möglich, die Eingangsspannung des Schaltreglers zur Beeinflussung der verfügbaren Leistung zu beeinflussen.From DE-C-39 34 007 is the use of a switching regulator to generate the supply voltage for a Transducer circuit and a sensor known, but it is with this known arrangement, the input voltage is not possible of the switching regulator to influence the available Affect performance.
Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Advantageous further developments and refinements of the invention are marked in the subclaims.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der Beschreibung von Ausführungsbeispielen anhand der Zeichnung. In der Zeichnung zeigen:
- Figur 1
- eine schematische Darstellung einer Anordnung zur Signalübertragung zwischen einer Geberstelle und einer Empfangsstelle gemäß einem ersten Ausführungsbeispiel,
- Figur 2
- ein Diagramm zur Erläuterung des Zusammenhangs zwischen dem Meßwert, dem Signalstrom und der Eingangsspannung des Schaltreglers und
- Figur 3
- eine schematische Darstellung einer Anordnung zur Signalübertragung zwischen einer Geberstelle und einer Empfangsstelle gemäß einem zweiten Ausführungsbeispiel.
- Figure 1
- 1 shows a schematic representation of an arrangement for signal transmission between a transmitter location and a reception location according to a first exemplary embodiment,
- Figure 2
- a diagram for explaining the relationship between the measured value, the signal current and the input voltage of the switching regulator and
- Figure 3
- is a schematic representation of an arrangement for signal transmission between a transmitter and a receiver according to a second embodiment.
In der Zeichnung zeigt Figur 1 schematisch eine Geberstelle
10, die mit einer Empfangsstelle 12 über eine Zweidrahtleitung
14 verbunden ist. Die Geberstelle 10 ist bei dem
dargestellten Beispiel eine Meßstelle, in der mit Hilfe
eines Sensors 16 ein Meßwert (beispielsweise Temperatur,
Druck, Feuchtigkeit, Füllstand, Durchfluß) erfaßt wird. Die
Geberstelle 10 enthält keine eigene Energiequelle, sondern
bezieht den für ihren Betrieb erforderlichen Versorgungsstrom
über die Zweidrahtleitung 14 von einer in der
Empfangsstelle 12 enthaltenen Spannungsquelle 18. Über die
gleiche Zweidrahtleitung 14 wird ein jeweils den gerade
gemessenen Meßwert darstellendes Meßwertsignal von der
Geberstelle 10 zur Empfangsstelle 14 übertragen. Einer
üblichen Technik entsprechend ist das Meßwertsignal ein über
die Zweidrahtleitung 14 fließender Signalstrom IS, der sich
zwischen zwei vorgegebenen Werten (üblicherweise den Stromwerten
4 mA und 20 mA) ändern kann. Die Spannungsquelle 18
liefert eine Gleichspannung, und der Meßstrom IS ist ein
Gleichstrom.In the drawing, FIG. 1 shows schematically a
Zur Meßwerterfassung enthält die Geberstelle 10 den bereits
erwähnten Sensor 16 und eine mit ihm verbundene Meßwandlerschaltung
20, die an Ausgängen 22 und 24 zwei den jeweils
erfaßten Meßwert repräsentierende Signale abgibt. Der Zweck
dieser beiden Signale wird anschließend noch erläutert.The
Die Empfangsstelle 12 enthält eine Auswertungsschaltung 26,
die aus dem über die Zweidrahtleitung 14 übertragenen
Signalstrom IS die Meßwertinformation gewinnt. Zu diesem
Zweck ist in die Zweidrahtleitung ein Meßwiderstand 28
eingefügt, an dem eine Spannung UM entsteht, die dem über
die Zweidrahtleitung übertragenen Signalstrom IS proportional
ist und die der Auswertungsschaltung 26 zugeführt
wird. In dem schematischen Schaltbild von Figur 1 ist in der
Empfangsstelle 12 ferner ein Widerstand 30 gezeigt, der
neben dem Widerstand 28 die Last repräsentiert, die empfängerseitig
an der Zweidrahtleitung 14 liegt.The
Der Signalstrom IS wird in der Geberstelle 10 durch eine
steuerbare Stromquelle 32 eingestellt, der das von der
Meßwandlerschaltung 20 am Ausgang 24 abgegebene Signal als
Steuersignal für den festzulegenden Signalstrom IS zugeführt
wird. Abhängig vom jeweils erfaßten Meßwert wird somit der
in der Zweidrahtleitung fließende Signalstrom IS durch eine
entsprechende Steuerung der Stromquelle 32 bestimmt.The signal current I S is set in the
Wie aus Figur 1 ferner hervorgeht, enthält die Geberstelle
10 eine steuerbare Spannungsquelle 34 und einen Schaltregler
36, dessen Aufgabe darin besteht, eine konstante Betriebsspannung
für die Meßwandlerschaltung 20 und den Sensor 16 zu
erzeugen. Die Eingangsspannung für den Schaltregler 36 wird
von der Spannungsquelle 34 geliefert, wobei der Wert der
Ausgangsspannung dieser Spannungsquelle 34 mit Hilfe des von
der Meßwandlerschaltung 20 am Ausgang 22 abgegebenen Signals
gesteuert werden kann.As can also be seen from FIG. 1, the donor station contains
10 a
Die Verwendung des Schaltreglers 36 in Verbindung mit der
steuerbaren Spannungsquelle 34 ermöglicht es, der Meßwandlerschaltung
20 und dem Sensor 16 stets die höchstmögliche
Leistung zur Verfügung zu stellen. Der Schaltregler 36 sorgt
dabei dafür, daß trotz einer Erhöhung seiner Eingangsspannung
die Betriebsspannung der Meßwandlerschaltung 20 und des
Sensors 16 auf einem konstanten Wert gehalten wird, so daß
durch eine Erhöhung der Eingangsspannung am Schaltregler 36
eine höhere Eingangsleistung zur Verfügung steht, die somit
auch eine höhere Ausgangsleistung ermöglicht. Bei einem vom
Sensor 16 erfaßten Meßwert, der am unteren Ende des Meßwertbereichs
liegt, nimmt der Signalstrom IS ebenfalls den
unteren Wert des Signalstrombereichs an, im oben angegebenen
Beispiel also den Wert von 4 mA, so daß auch die Eingangsleistung
am Schaltregler 36 einen niedrigen Wert annehmen
würde, da sie durch das Produkt aus Signalstrom und Eingangsspannung
gebildet wird. Durch das Steuersignal aus der
Meßwandlerschaltung 20 kann die Ausgangsspannung der Spannungsquelle
34 für diesen Fall erhöht werden, so daß die am
Eingang des Schaltreglers 36 verfügbare Leistung ebenfalls
erhöht wird. Diese erhöhte Leistung steht dann auch für den
Betrieb der Meßwandlerschaltung 20 und des Sensors 16 zur
Verfügung.The use of the
Wenn der vom Sensor 16 erfaßte Meßwert einen hohen Wert hat,
der zu einem hohen Signalstrom IS führt, wird mittels des
Steuersignals aus der Meßwandlerschaltung 20 die von der
Spannungsquelle 34 am Eingang des Schaltreglers 36 erzeugte
Eingangsspannung herabgesetzt, da in diesem Fall wegen des
hohen Signalstroms IS genügend Leistung für den Betrieb der
Meßwandlerschaltung 20 und des Sensors 16 zur Verfügung
steht. If the measured value detected by the
In welchen Grenzen die von der Spannungsquelle 34 eingestellte
Spannung abhängig vom jeweils erfaßten Meßwert
verändert werden kann, hängt von mehreren Faktoren, wie der
Ausgangsspannung der Versorgungsspannungsquelle 18, der aus
dem Meßwiderstand 28 und im Widerstand 30 gebildeten Last in
der Empfängerstelle 12 und von der minimalen Klemmenspannung
UK ab, die an der Geberstelle 10 für deren einwandfreiem
Betrieb vorhanden sein muß.The limits within which the voltage set by the
In Figur 2 ist ein Diagramm dargestellt, aus dem hervorgeht,
wie sich die von der Spannungsquelle 34 erzeugte Spannung Ue
und der Signalstrom IS in Abhängigkeit vom Meßwert M ändert.
Der Meßwert M ist dabei normiert dargestellt; sein kleinster
Wert hat den normierten Wert 0 und sein größter Wert hat den
normierten Wert 1. Bei der oben erwähnten Zweidrahttechnik
hat der Signalstrom IS beim minimalen Meßwert den Wert 4 mA
und beim maximalen Meßwert den Wert 20 mA. Im angegebenen
Beispiel ändert sich dabei die Eingangsspannung Ue von 12 V
beim minimalen Meßwert auf 10 V beim maximalen Meßwert.
Diese Werte sind hier nur als Beispiel angegeben; je nach
Anwendungsfall können sie auch davon abweichen.FIG. 2 shows a diagram which shows how the voltage U e generated by the
In Figur 3 ist eine weitere Ausführungsform der hier zu
beschreibenden Anordnung dargestellt. Im Gegensatz zum
Ausführungsbeispiel von Figur 1 wird in diesem Fall die
Spannungsquelle 34 nicht durch ein Ausgangssignal der
Meßwandlerschaltung 20, sondern direkt durch die Klemmenspannung
Uk an der Geberstelle gesteuert. Diese Klemmenspannung
kann zu diesem Zweck verwendet werden, da sie
ebenfalls eindeutig mit dem vom Sensor 16 erfaßten Meßwert
in Beziehung steht, der zur Einstellung des Signalstroms IS
führt. Der Signalstrom IS, der auch in der Empfängerstelle
12 fließt, bestimmt wiederum die Klemmenspannung Uk aufgrund
der Spannungsabfälle in der Empfängerstelle.FIG. 3 shows a further embodiment of the arrangement to be described here. In contrast to the exemplary embodiment of FIG. 1, in this case the
Die obigen Ausführungen zeigen, daß mit Hilfe der beschriebenen
Anordnung eine Optimierung der der Meßwandlerschaltung
20 und dem Sensor 16 zur Verfügung gestellten Leistung
ermöglicht wird. Eine Anwendung dieses Prinzips ist nicht
auf die Verwendung bei bestimmten Meßwandlerschaltungen und
Sensoren beschränkt. Beispielsweise kann sie ohne weiteres
bei Mikrowellen-Füllstandsmeßgeräten eingesetzt werden, die
nach dem Pulsradar-Verfahren oder dem Frequenzmodulations-Dauer-Radarverfahren
arbeiten.The above statements show that with the help of the described
Arrangement an optimization of the
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19723645 | 1997-06-05 | ||
DE19723645A DE19723645B4 (en) | 1997-06-05 | 1997-06-05 | Arrangement for signal transmission between a donor site and a receiving site |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0883097A2 true EP0883097A2 (en) | 1998-12-09 |
EP0883097A3 EP0883097A3 (en) | 1999-02-17 |
EP0883097B1 EP0883097B1 (en) | 2003-03-19 |
Family
ID=7831521
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98109740A Revoked EP0883097B1 (en) | 1997-06-05 | 1998-05-28 | Device for transmitting signals between a transmitter and a receiver |
Country Status (4)
Country | Link |
---|---|
US (1) | US6140940A (en) |
EP (1) | EP0883097B1 (en) |
JP (1) | JP2960717B2 (en) |
DE (2) | DE19723645B4 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29917651U1 (en) * | 1999-10-07 | 2000-11-09 | Siemens AG, 80333 München | Transmitter and process control system |
DE19919084A1 (en) * | 1999-04-27 | 2000-11-16 | Micronas Intermetall Gmbh | Two-wire sensor device |
WO2000075904A1 (en) * | 1999-06-08 | 2000-12-14 | Krohne Messtechnik Gmbh & Co. Kg | Circuit for recording, transmitting and evaluating measured values |
DE10034684A1 (en) * | 2000-07-17 | 2002-01-31 | Endress Hauser Gmbh Co | Measuring device for measuring a process variable |
EP1158274B1 (en) * | 2000-05-19 | 2009-02-18 | Endress + Hauser Flowtec AG | Controlled current sources of two-wire measuring apparatuses |
DE102007062919A1 (en) | 2007-12-21 | 2009-06-25 | Endress + Hauser Gmbh + Co. Kg | Device for diagnosing or determining operating conditions or environmental conditions of field device of process automation technology, comprises voltmeter unit, where effective loop current is determined over voltage drop |
WO2010014102A1 (en) * | 2008-07-31 | 2010-02-04 | Micro Motion, Inc. | Bus instrument and method for predictively limiting power consumption in a two-wire instrumentation bus |
EP2346011A1 (en) * | 2009-10-21 | 2011-07-20 | Asahi Kasei Microdevices Corporation | Two-wire transmitter |
EP2439711A1 (en) * | 2010-10-05 | 2012-04-11 | Yokogawa Electric Corporation | Two-wire transmitter |
WO2013097989A1 (en) * | 2011-12-27 | 2013-07-04 | Endress+Hauser Gmbh+Co. Kg | Device for determining and/or monitoring a limit value of a process variable |
WO2015090758A1 (en) * | 2013-12-18 | 2015-06-25 | Endress+Hauser Gmbh+Co. Kg | Field device for detecting or monitoring a physical or chemical process variable of a medium |
Families Citing this family (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69223186T2 (en) * | 1991-07-24 | 1998-03-12 | Matsushita Electric Ind Co Ltd | Composition for use in a transparent electroconductive film and process for producing the same |
DE20013501U1 (en) | 2000-08-04 | 2000-12-07 | Richard Hirschmann GmbH & Co., 72654 Neckartenzlingen | Circuit arrangement for connecting a sensor or actuator to a bus line |
US6930956B2 (en) * | 2002-01-18 | 2005-08-16 | Siemens Milltronics Process Instruments, Inc. | Current loop control circuit for a time of flight ranging system |
CA2374795A1 (en) * | 2002-03-05 | 2003-09-05 | Siemens Milltronics Process Instruments Inc. | Current limiter with low drop voltage for surge protection and fuse protection |
EP1471641A1 (en) * | 2003-04-25 | 2004-10-27 | Siemens Aktiengesellschaft | Input control circuit for an electric device |
US20060265105A1 (en) * | 2005-05-20 | 2006-11-23 | Hughes Albert R | Loop-powered field instrument |
US7480487B2 (en) * | 2005-05-20 | 2009-01-20 | Dresser, Inc. | Power regulation for field instruments |
WO2007130017A1 (en) * | 2006-04-28 | 2007-11-15 | Micro Motion, Inc. | Bus loop power interface and method |
KR20090009322A (en) * | 2006-05-12 | 2009-01-22 | 엔엑스피 비 브이 | Current interface with a blocking capacitor attached to an additional pin |
DE102007021099A1 (en) | 2007-05-03 | 2008-11-13 | Endress + Hauser (Deutschland) Ag + Co. Kg | Method for commissioning and / or reconfiguring a programmable field meter |
DE102007035710A1 (en) * | 2007-07-30 | 2009-02-05 | Siemens Ag | Measuring transducer e.g. position regulator, for use in system and automation technology of petrochemical industry, has voltage limiting unit, whose feeding voltage is adjustable independent of measured loop current |
EP2053254B1 (en) * | 2007-10-24 | 2010-03-17 | Festo AG & Co. KG | Fluid valve assembly with at least one electromagnetic valve and an identification data containing device |
DE102007058608A1 (en) | 2007-12-04 | 2009-06-10 | Endress + Hauser Flowtec Ag | Electric device |
DE102008022373A1 (en) | 2008-05-06 | 2009-11-12 | Endress + Hauser Flowtec Ag | Measuring device and method for monitoring a measuring device |
DE102009024853A1 (en) * | 2008-06-12 | 2009-12-17 | Abb Technology Ag | Telemetry device with a loop-fed device and method for its operating voltage supply |
RU2449378C1 (en) * | 2008-07-31 | 2012-04-27 | Майкро Моушн, Инк. | Bus instrument and method for predictively limited power consumption in two-wire instrumentation bus |
DE102008043178A1 (en) * | 2008-10-24 | 2010-04-29 | Endress + Hauser Wetzer Gmbh + Co. Kg | Field device for process automation technology, has control unit including current measurement unit that determines value of intensity of current applied at interface and flowing via control element |
DE102008043199A1 (en) * | 2008-10-27 | 2010-04-29 | Endress + Hauser Process Solutions Ag | Self-sufficient field device |
DE102009005220A1 (en) * | 2009-01-20 | 2010-04-22 | Continental Automotive Gmbh | Smart sensor system for use in automobile, has voltage regulator for supplying external supply voltage via supply line, and electronic switch whose load connection is connected with constant operating voltage by resistor |
DE102009014252A1 (en) | 2009-03-20 | 2010-09-23 | Siemens Aktiengesellschaft | Field device for process instrumentation |
EP2561603B1 (en) | 2010-04-19 | 2019-09-04 | Endress+Hauser Flowtec AG | Driver circuit for a measuring transducer and measuring system designed having same |
DE202010006553U1 (en) | 2010-05-06 | 2011-10-05 | Endress + Hauser Flowtec Ag | Electronic measuring device with an optocoupler |
DE102010030924A1 (en) | 2010-06-21 | 2011-12-22 | Endress + Hauser Flowtec Ag | Electronics housing for an electronic device or device formed therewith |
DE102010062310A1 (en) | 2010-12-01 | 2012-06-06 | Siemens Aktiengesellschaft | Circuit arrangement for transmitting a digital signal with an optocoupler |
DE102011050007B4 (en) * | 2011-04-29 | 2015-10-22 | Samson Ag | positioner |
DE102011076838A1 (en) | 2011-05-31 | 2012-12-06 | Endress + Hauser Flowtec Ag | Meter electronics for a meter device and meter device formed thereby |
DE102013100799A1 (en) | 2012-12-21 | 2014-06-26 | Endress + Hauser Flowtec Ag | Converter circuit with a current interface and measuring device with such a converter circuit |
DE102013109096A1 (en) | 2013-08-22 | 2015-02-26 | Endress + Hauser Flowtec Ag | Tamper-proof electronic device |
DE102014108107A1 (en) | 2014-06-10 | 2015-12-17 | Endress + Hauser Flowtec Ag | Coil arrangement and thus formed electromechanical switch or transmitter |
DE102016114860A1 (en) | 2016-08-10 | 2018-02-15 | Endress + Hauser Flowtec Ag | Driver circuit and thus formed converter electronics or thus formed measuring system |
DE102017102678A1 (en) | 2017-02-10 | 2018-08-16 | Endress+Hauser SE+Co. KG | Field device for determining a limit value |
DE102017130775A1 (en) | 2017-12-20 | 2019-06-27 | Endress+Hauser SE+Co. KG | Field device electronics for a field device of automation technology |
JP7010205B2 (en) | 2018-12-25 | 2022-01-26 | 横河電機株式会社 | 2-wire transmitter |
DE102019201322A1 (en) * | 2019-02-01 | 2020-08-06 | Vega Grieshaber Kg | Analog-digital mixed operation for one sensor input |
DE102022119145A1 (en) | 2022-07-29 | 2024-02-01 | Endress+Hauser Flowtec Ag | Connection circuit for a field device and field device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3934007A1 (en) * | 1989-03-31 | 1990-10-04 | Fischer & Porter Co | TWO WIRE REMOTE EQUIPMENT |
WO1994020940A1 (en) * | 1993-03-03 | 1994-09-15 | Milltronics Ltd. | Loop powered process control transmitter |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3783387A (en) * | 1972-06-14 | 1974-01-01 | Gen Electric | Noise detector circuit |
JPS56140495A (en) * | 1980-03-31 | 1981-11-02 | Yokogawa Electric Works Ltd | 2-wire type transmitter |
US4520488A (en) * | 1981-03-02 | 1985-05-28 | Honeywell, Inc. | Communication system and method |
US4806905A (en) * | 1986-10-01 | 1989-02-21 | Honeywell Inc. | Transmitter for transmitting on a two-wire transmitting line |
FR2629609B1 (en) * | 1988-03-31 | 1990-12-28 | Jacques Lewiner | IMPROVEMENTS TO ELECTRONIC INTERROGATION CIRCUITS |
DE4412388A1 (en) * | 1994-06-08 | 1995-12-14 | Hoenicke Helmut Prof Dipl Ing | Current-loop powered electropneumatic actuator controller |
EP0744724B1 (en) * | 1995-05-24 | 2001-08-08 | Endress + Hauser Gmbh + Co. | Device for power supply by wire of a signal transmitter by the signal receiver |
-
1997
- 1997-06-05 DE DE19723645A patent/DE19723645B4/en not_active Revoked
-
1998
- 1998-05-28 DE DE59807514T patent/DE59807514D1/en not_active Revoked
- 1998-05-28 EP EP98109740A patent/EP0883097B1/en not_active Revoked
- 1998-06-03 US US09/089,688 patent/US6140940A/en not_active Expired - Lifetime
- 1998-06-04 JP JP10155727A patent/JP2960717B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3934007A1 (en) * | 1989-03-31 | 1990-10-04 | Fischer & Porter Co | TWO WIRE REMOTE EQUIPMENT |
WO1994020940A1 (en) * | 1993-03-03 | 1994-09-15 | Milltronics Ltd. | Loop powered process control transmitter |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19919084A1 (en) * | 1999-04-27 | 2000-11-16 | Micronas Intermetall Gmbh | Two-wire sensor device |
DE19919084C2 (en) * | 1999-04-27 | 2001-05-31 | Micronas Gmbh | Two-wire sensor device |
US6437581B1 (en) | 1999-04-27 | 2002-08-20 | Micronas Gmbh | Two wire sensor device |
WO2000075904A1 (en) * | 1999-06-08 | 2000-12-14 | Krohne Messtechnik Gmbh & Co. Kg | Circuit for recording, transmitting and evaluating measured values |
US6577989B2 (en) | 1999-06-08 | 2003-06-10 | Krohne Messtechnik Gmbh & Co., K.G. | Circuit arrangement for measured value detection, transfer and analysis |
DE29917651U1 (en) * | 1999-10-07 | 2000-11-09 | Siemens AG, 80333 München | Transmitter and process control system |
EP1158274B1 (en) * | 2000-05-19 | 2009-02-18 | Endress + Hauser Flowtec AG | Controlled current sources of two-wire measuring apparatuses |
DE10034684A1 (en) * | 2000-07-17 | 2002-01-31 | Endress Hauser Gmbh Co | Measuring device for measuring a process variable |
US6512358B2 (en) | 2000-07-17 | 2003-01-28 | Endress + Hauser Gmbh + Co. | Measuring device for measuring a process variable |
DE102007062919A1 (en) | 2007-12-21 | 2009-06-25 | Endress + Hauser Gmbh + Co. Kg | Device for diagnosing or determining operating conditions or environmental conditions of field device of process automation technology, comprises voltmeter unit, where effective loop current is determined over voltage drop |
WO2010014102A1 (en) * | 2008-07-31 | 2010-02-04 | Micro Motion, Inc. | Bus instrument and method for predictively limiting power consumption in a two-wire instrumentation bus |
US8595519B2 (en) | 2008-07-31 | 2013-11-26 | Micro Motion, Inc. | Bus instrument and method for predictively limited power consumption in a two-wire instrumentation bus |
EP2346011A1 (en) * | 2009-10-21 | 2011-07-20 | Asahi Kasei Microdevices Corporation | Two-wire transmitter |
EP2346011A4 (en) * | 2009-10-21 | 2014-04-30 | Asahi Kasei Microdevices Corp | Two-wire transmitter |
EP2439711A1 (en) * | 2010-10-05 | 2012-04-11 | Yokogawa Electric Corporation | Two-wire transmitter |
US8718152B2 (en) | 2010-10-05 | 2014-05-06 | Yokogawa Electric Corporation | Two-wire transmitter |
WO2013097989A1 (en) * | 2011-12-27 | 2013-07-04 | Endress+Hauser Gmbh+Co. Kg | Device for determining and/or monitoring a limit value of a process variable |
CN104024809A (en) * | 2011-12-27 | 2014-09-03 | 恩德莱斯和豪瑟尔两合公司 | Device For Determining And/Or Monitoring A Limit Value Of A Process Variable |
US10067081B2 (en) | 2011-12-27 | 2018-09-04 | Endress + Hauser Gmbh + Co. Kg | Apparatus for determining and/or monitoring a limit value of a process variable |
WO2015090758A1 (en) * | 2013-12-18 | 2015-06-25 | Endress+Hauser Gmbh+Co. Kg | Field device for detecting or monitoring a physical or chemical process variable of a medium |
CN105900023A (en) * | 2013-12-18 | 2016-08-24 | 恩德莱斯和豪瑟尔两合公司 | Field device for detecting or monitoring a physical or chemical process variable of a medium |
Also Published As
Publication number | Publication date |
---|---|
EP0883097B1 (en) | 2003-03-19 |
EP0883097A3 (en) | 1999-02-17 |
JP2960717B2 (en) | 1999-10-12 |
DE19723645A1 (en) | 1998-12-10 |
US6140940A (en) | 2000-10-31 |
JPH1116082A (en) | 1999-01-22 |
DE19723645B4 (en) | 2006-04-13 |
DE59807514D1 (en) | 2003-04-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0883097B1 (en) | Device for transmitting signals between a transmitter and a receiver | |
DE4132557C2 (en) | Device for transmitting electrical signals from a stationary control device to a transient unbalance compensation device | |
EP0744724B1 (en) | Device for power supply by wire of a signal transmitter by the signal receiver | |
DE69620099T2 (en) | High-frequency power amplifier | |
DE2929901C2 (en) | Electronic channel selector | |
DE2941831A1 (en) | DEVICE FOR DETERMINING THE STATE OF SEVERAL BISTABLE DEVICES LOCATED FROM A CENTRAL STATION | |
EP2348326B1 (en) | Current sensor unit and method for signal and/or data transfer | |
DE3025358A1 (en) | CONTROL SYSTEM FOR ADJUSTING A PHYSICAL SIZE | |
EP2806253A2 (en) | Measuring arrangement for determining a measured variable | |
WO2000070764A1 (en) | Compact bus interface with an integrated electrical isolation | |
DE3615452A1 (en) | ARRANGEMENT FOR TRANSMITTING SIGNALS IN A MEASURING ARRANGEMENT | |
DE3320110A1 (en) | Magnetic control valve | |
EP1048934A2 (en) | Dual-wire-type detector | |
DE3337041C1 (en) | Circuit device for logarithmization and digitization of analog signals | |
DE10331078B4 (en) | Device for detecting a physical quantity | |
EP1203933B1 (en) | Sensor device for measuring at least one variable | |
EP1156299A1 (en) | Measuring transducer for potentiometric position sensors and method for adjusting the parameters | |
EP0997747B1 (en) | Method for optimising the operation of an ultrasonic proximity switch and ultrasonic proximity switch with optimised operation | |
DE10102791B4 (en) | Electrical transmitter | |
EP0725995B1 (en) | Remote power supply unit | |
DE4016922A1 (en) | Two wire electrical measurement transducer - has main analogue path and digital correction path, enabling continuous measurement and rapid parameter change tracking | |
DE2944463A1 (en) | INDUCTIVE MEASURING DEVICE FOR A CONTROL OR REGULATOR, ESPECIALLY AN INTERNAL COMBUSTION ENGINE | |
EP1247109B1 (en) | Electrical circuit arrangement for converting an electrical input variable into an output electrical voltage | |
DE4426765C1 (en) | Two-wire transducer to four-wire measurement system, matching circuit | |
DE102017112755B4 (en) | Current repeater |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): DE FR GB IT |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
17P | Request for examination filed |
Effective date: 19990708 |
|
AKX | Designation fees paid |
Free format text: DE FR GB IT |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: ENDRESS + HAUSER GMBH + CO.KG. |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 20020516 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB IT |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REF | Corresponds to: |
Ref document number: 59807514 Country of ref document: DE Date of ref document: 20030424 Kind code of ref document: P |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 20030516 |
|
ET | Fr: translation filed | ||
PLBQ | Unpublished change to opponent data |
Free format text: ORIGINAL CODE: EPIDOS OPPO |
|
PLBI | Opposition filed |
Free format text: ORIGINAL CODE: 0009260 |
|
PLAX | Notice of opposition and request to file observation + time limit sent |
Free format text: ORIGINAL CODE: EPIDOSNOBS2 |
|
26 | Opposition filed |
Opponent name: IFM ELECTRONIC GMBH Effective date: 20031219 |
|
PLBB | Reply of patent proprietor to notice(s) of opposition received |
Free format text: ORIGINAL CODE: EPIDOSNOBS3 |
|
APBP | Date of receipt of notice of appeal recorded |
Free format text: ORIGINAL CODE: EPIDOSNNOA2O |
|
APBM | Appeal reference recorded |
Free format text: ORIGINAL CODE: EPIDOSNREFNO |
|
RAP2 | Party data changed (patent owner data changed or rights of a patent transferred) |
Owner name: ENDRESS + HAUSER (DEUTSCHLAND) HOLDING GMBH |
|
APBQ | Date of receipt of statement of grounds of appeal recorded |
Free format text: ORIGINAL CODE: EPIDOSNNOA3O |
|
APAH | Appeal reference modified |
Free format text: ORIGINAL CODE: EPIDOSCREFNO |
|
RAP2 | Party data changed (patent owner data changed or rights of a patent transferred) |
Owner name: ENDRESS + HAUSER (DEUTSCHLAND) HOLDING GMBH Owner name: ENDRESS + HAUSER GMBH + CO. KG |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20070522 Year of fee payment: 10 |
|
APBU | Appeal procedure closed |
Free format text: ORIGINAL CODE: EPIDOSNNOA9O |
|
RDAF | Communication despatched that patent is revoked |
Free format text: ORIGINAL CODE: EPIDOSNREV1 |
|
RDAG | Patent revoked |
Free format text: ORIGINAL CODE: 0009271 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: PATENT REVOKED |
|
27W | Patent revoked |
Effective date: 20070626 |
|
GBPR | Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state |
Free format text: 20070626 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20070522 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20070516 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20120531 Year of fee payment: 15 |