EP0883097B1 - Anordnung zur Signalübertragung zwischen einer Geberstelle und einer Empfangsstelle - Google Patents
Anordnung zur Signalübertragung zwischen einer Geberstelle und einer Empfangsstelle Download PDFInfo
- Publication number
- EP0883097B1 EP0883097B1 EP98109740A EP98109740A EP0883097B1 EP 0883097 B1 EP0883097 B1 EP 0883097B1 EP 98109740 A EP98109740 A EP 98109740A EP 98109740 A EP98109740 A EP 98109740A EP 0883097 B1 EP0883097 B1 EP 0883097B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- transmitter location
- current
- transmitter
- signal
- 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.)
- Revoked
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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 interconnected by a two-wire line are, via which a variable between two limit values analog signal current is transmitted, which 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 station, and one in the donor station 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 ones 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. Via the same two-wire line 14, a measured value signal representing the measured value just measured is sent from the encoder point 10 to the receiving point 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
- 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 receiver side on the two-wire line 14.
- the signal current I S is set in the transmitter point 10 by a controllable current source 32, to which the signal emitted by the transducer circuit 20 at the output 24 is fed 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 thus 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 output signal 22 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 enables higher output power.
- the signal current I S also assumes the lower value of the signal current range, i.e.
- 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 sufficient 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 recorded 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 from 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 Uk due to 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)
Description
- 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.
Claims (3)
- Anordnung zur Signalübertragung zwischen einer Geberstelle (10) und einer Empfangsstelle (12), die miteinander durch eine Zweidrahtleitung (14) verbunden sind, über die ein zwischen zwei Grenzwerten veränderlicher analoger Signalstrom (IS) übertragen wird, der einen in der Geberstelle (10) von einem Sensor (16) erfaßten Meßwert repräsentiert und den für den Betrieb der Geberstelle (10) erforderlichen Versorgungsstrom bildet, wobei die Geberstelle (10) eine Schaltung (36) aufweist, die eine konstante Betriebsspannung für die Geberstelle (10) erzeugt, und wobei in der Geberstelle (10) eine steuerbare Stromquelle (32) vorgesehen ist, die den über die Zweidrahtleitung (14) fließenden Strom in Abhängigkeit von dem Meßwert bestimmt, dadurch gekennzeichnet, daß die die Betriebsspannung für die Geberstelle (10) erzeugende Schaltung (36) ein Schaltregler ist, und daß in der Geberstelle (10) eine Spannungsquelle (34) vorgesehen ist, deren Ausgangsspannung sich entgegengesetzt zum Signalstrom ändert und die die Eingangsspannung des Abwärts-Schaltreglers (36) bildet.
- Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Spannungsquelle (34) durch ein Steuersignal gesteuert wird, das von einer Meßwandlerschaltung (20) erzeugt wird, die das vom Sensor (16) abgegebene, den Meßwert repräsentierende Signal verarbeitet.
- Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Spannungsquelle (34) durch ein von den Eingangsklemmen der Geberstelle (10) abgegriffenes, der Spannung (UK) an der Zweidrahtleitung (14) entsprechendes Steuersignal gesteuert wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19723645A DE19723645B4 (de) | 1997-06-05 | 1997-06-05 | Anordnung zur Signalübertragung zwischen einer Geberstelle und einer Empfangsstelle |
DE19723645 | 1997-06-05 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0883097A2 EP0883097A2 (de) | 1998-12-09 |
EP0883097A3 EP0883097A3 (de) | 1999-02-17 |
EP0883097B1 true EP0883097B1 (de) | 2003-03-19 |
Family
ID=7831521
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98109740A Revoked EP0883097B1 (de) | 1997-06-05 | 1998-05-28 | Anordnung zur Signalübertragung zwischen einer Geberstelle und einer Empfangsstelle |
Country Status (4)
Country | Link |
---|---|
US (1) | US6140940A (de) |
EP (1) | EP0883097B1 (de) |
JP (1) | JP2960717B2 (de) |
DE (2) | DE19723645B4 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2449378C1 (ru) * | 2008-07-31 | 2012-04-27 | Майкро Моушн, Инк. | Инструмент шины и способ для прогнозируемого ограничения энергопотребления в двухпроводной инструментальной шине |
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DE69223186T2 (de) * | 1991-07-24 | 1998-03-12 | Matsushita Electric Ind Co Ltd | Zusammensetzung zur Verwendung in einem transparenten elektrisch leitenden Film sowie Verfahren zur Herstellung dieses Films |
DE19919084C2 (de) * | 1999-04-27 | 2001-05-31 | Micronas Gmbh | Zweidrahtsensoreinrichtung |
DE19925943A1 (de) * | 1999-06-08 | 2000-12-21 | Krohne Messtechnik Kg | Schaltungsanordnung zur Meßwerterfassung, -übertragung und -auswertung |
DE29917651U1 (de) * | 1999-10-07 | 2000-11-09 | Siemens Ag | Meßumformer sowie Prozeßleitsystem |
ATE423303T1 (de) * | 2000-05-19 | 2009-03-15 | Flowtec Ag | Gesteuerte stromquellen von zwei-leiter- messgeräten |
DE10034684A1 (de) | 2000-07-17 | 2002-01-31 | Endress Hauser Gmbh Co | Meßeinrichtung zur Messung einer Prozeßvariablen |
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 (de) * | 2003-04-25 | 2004-10-27 | Siemens Aktiengesellschaft | Steuereingangsschaltung für ein elektrisches Gerät |
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 |
US8063694B2 (en) * | 2006-04-28 | 2011-11-22 | Micro Motion, Inc. | Bus loop power interface and method |
WO2007132389A1 (en) * | 2006-05-12 | 2007-11-22 | Nxp B.V. | Current interface with a blocking capacitor attached to an additional pin |
DE102007021099A1 (de) | 2007-05-03 | 2008-11-13 | Endress + Hauser (Deutschland) Ag + Co. Kg | Verfahren zum Inbetriebnehmen und/oder Rekonfigurieren eines programmierbaren Feldmeßgeräts |
DE102007035710A1 (de) * | 2007-07-30 | 2009-02-05 | Siemens Ag | Messumformer und Stellungsregler zum Anschließen an eine Zweileiter-Stromschleife sowie deren Verwendung |
ATE461369T1 (de) * | 2007-10-24 | 2010-04-15 | Festo Ag & Co Kg | Fluidische ventilanordnung mit wenigstens einem elektromagnetventil und einem identifikationsdatenspeicher |
DE102007058608A1 (de) | 2007-12-04 | 2009-06-10 | Endress + Hauser Flowtec Ag | Elektrisches Gerät |
DE102007062919A1 (de) | 2007-12-21 | 2009-06-25 | Endress + Hauser Gmbh + Co. Kg | Vorrichtung zur Diagnose und/oder Ermittlung von Betriebs- bedingungen und/oder von Umgebungsbedingungen eines Feldgeräts der Prozessautomatisierungstechnik |
DE102008022373A1 (de) | 2008-05-06 | 2009-11-12 | Endress + Hauser Flowtec Ag | Meßgerät sowie Verfahren zum Überwachen eines Meßgeräts |
DE102009024853A1 (de) | 2008-06-12 | 2009-12-17 | Abb Technology Ag | Fernmesstechnische Einrichtung mit einem schleifengespeisten Gerät und Verfahren zu dessen Betriebsspannungsversorgung |
CA2731949C (en) * | 2008-07-31 | 2015-02-03 | Micro Motion, Inc. | Bus instrument and method for predictively limiting power consumption in a two-wire instrumentation bus |
DE102008043178A1 (de) * | 2008-10-24 | 2010-04-29 | Endress + Hauser Wetzer Gmbh + Co. Kg | Feldgerät der Prozessautomatisierungstechnik |
DE102008043199A1 (de) * | 2008-10-27 | 2010-04-29 | Endress + Hauser Process Solutions Ag | Autarkes Feldgerät |
DE102009005220A1 (de) * | 2009-01-20 | 2010-04-22 | Continental Automotive Gmbh | Konstante Laststrommodulation für Sensoren |
DE102009014252A1 (de) | 2009-03-20 | 2010-09-23 | Siemens Aktiengesellschaft | Feldgerät zur Prozessinstrumentierung |
JP4830058B2 (ja) * | 2009-10-21 | 2011-12-07 | 旭化成エレクトロニクス株式会社 | 2線式伝送器 |
EP2561603B1 (de) | 2010-04-19 | 2019-09-04 | Endress+Hauser Flowtec AG | Treiberschaltung für einen messwandler sowie damit gebildetes messsystem |
DE202010006553U1 (de) | 2010-05-06 | 2011-10-05 | Endress + Hauser Flowtec Ag | Elektronisches Meßgerät mit einem Optokoppler |
DE102010030924A1 (de) | 2010-06-21 | 2011-12-22 | Endress + Hauser Flowtec Ag | Elektronik-Gehäuse für ein elektronisches Gerät bzw. damit gebildetes Gerät |
JP5141790B2 (ja) | 2010-10-05 | 2013-02-13 | 横河電機株式会社 | 2線式伝送器 |
DE102010062310A1 (de) | 2010-12-01 | 2012-06-06 | Siemens Aktiengesellschaft | Schaltungsanordnung zur Übertragung eines Digitalsignals mit einem Optokoppler |
DE102011050007B4 (de) * | 2011-04-29 | 2015-10-22 | Samson Ag | Stellungsregler |
DE102011076838A1 (de) | 2011-05-31 | 2012-12-06 | Endress + Hauser Flowtec Ag | Meßgerät-Elektronik für ein Meßgerät-Gerät sowie damit gebildetes Meßgerät-Gerät |
DE102011089941A1 (de) * | 2011-12-27 | 2013-06-27 | Endress + Hauser Gmbh + Co. Kg | Vorrichtung zur Bestimmung und/oder Überwachung eines Grenzwertes einer Prozessgröße |
DE102013100799A1 (de) | 2012-12-21 | 2014-06-26 | Endress + Hauser Flowtec Ag | Umformerschaltung mit einer Stromschnittstelle sowie Meßgerät mit einer solchen Umformerschaltung |
DE102013109096A1 (de) | 2013-08-22 | 2015-02-26 | Endress + Hauser Flowtec Ag | Gegen Manipulation geschütztes elektronisches Gerät |
DE102013114377A1 (de) * | 2013-12-18 | 2015-06-18 | Endress + Hauser Gmbh + Co. Kg | Feldgerät zur Erfassung oder Überwachung einer physikalischen oder chemischen Prozessgröße eines Mediums |
DE102014108107A1 (de) | 2014-06-10 | 2015-12-17 | Endress + Hauser Flowtec Ag | Spulenanordnung sowie damit gebildeter elektromechanischer Schalter bzw. Meßumformer |
DE102016114860A1 (de) | 2016-08-10 | 2018-02-15 | Endress + Hauser Flowtec Ag | Treiberschaltung sowie damit gebildete Umformer-Elektronik bzw. damit gebildetes Meßsystem |
DE102017102678A1 (de) | 2017-02-10 | 2018-08-16 | Endress+Hauser SE+Co. KG | Feldgerät zur Bestimmung eines Grenzwertes |
DE102017130775A1 (de) | 2017-12-20 | 2019-06-27 | Endress+Hauser SE+Co. KG | Feldgeräteelektronik für ein Feldgerät der Automatisierungstechnik |
JP7010205B2 (ja) | 2018-12-25 | 2022-01-26 | 横河電機株式会社 | 2線式伝送器 |
DE102019201322A1 (de) * | 2019-02-01 | 2020-08-06 | Vega Grieshaber Kg | Analog-Digitaler Mischbetrieb für einen Sensoreingang |
DE102022119145A1 (de) | 2022-07-29 | 2024-02-01 | Endress+Hauser Flowtec Ag | Anschlussschaltung für ein Feldgerät und Feldgerät |
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FR2629609B1 (fr) * | 1988-03-31 | 1990-12-28 | Jacques Lewiner | Perfectionnements aux circuits electroniques d'interrogation |
CA1311032C (en) * | 1989-03-31 | 1992-12-01 | Stanley Chlebda | Two-wire telemetering system including power regulated transmitting device |
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DE4412388A1 (de) * | 1994-06-08 | 1995-12-14 | Hoenicke Helmut Prof Dipl Ing | Leistungssparende Elektronikschaltung zur Stromversorgung elektro-pneumatischer Stellungsregler mit Mikrocontroller |
EP0744724B1 (de) * | 1995-05-24 | 2001-08-08 | Endress + Hauser Gmbh + Co. | Anordnung zur leitungsgebundenen Energieversorgung eines Signalgebers vom Singnalempfänger |
-
1997
- 1997-06-05 DE DE19723645A patent/DE19723645B4/de not_active Revoked
-
1998
- 1998-05-28 DE DE59807514T patent/DE59807514D1/de not_active Revoked
- 1998-05-28 EP EP98109740A patent/EP0883097B1/de not_active Revoked
- 1998-06-03 US US09/089,688 patent/US6140940A/en not_active Expired - Lifetime
- 1998-06-04 JP JP10155727A patent/JP2960717B2/ja not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2449378C1 (ru) * | 2008-07-31 | 2012-04-27 | Майкро Моушн, Инк. | Инструмент шины и способ для прогнозируемого ограничения энергопотребления в двухпроводной инструментальной шине |
Also Published As
Publication number | Publication date |
---|---|
EP0883097A2 (de) | 1998-12-09 |
EP0883097A3 (de) | 1999-02-17 |
DE59807514D1 (de) | 2003-04-24 |
JPH1116082A (ja) | 1999-01-22 |
DE19723645A1 (de) | 1998-12-10 |
JP2960717B2 (ja) | 1999-10-12 |
DE19723645B4 (de) | 2006-04-13 |
US6140940A (en) | 2000-10-31 |
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