EP1866887B1 - Feeder for a measuring transducer for use in process automation technology - Google Patents
Feeder for a measuring transducer for use in process automation technology Download PDFInfo
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- EP1866887B1 EP1866887B1 EP06725336.9A EP06725336A EP1866887B1 EP 1866887 B1 EP1866887 B1 EP 1866887B1 EP 06725336 A EP06725336 A EP 06725336A EP 1866887 B1 EP1866887 B1 EP 1866887B1
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- transmitter
- power supply
- supply unit
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- 238000005516 engineering process Methods 0.000 title claims description 8
- 238000004801 process automation Methods 0.000 title claims description 6
- 230000011664 signaling Effects 0.000 claims description 14
- 238000002955 isolation Methods 0.000 claims description 6
- 230000004888 barrier function Effects 0.000 claims description 4
- 231100001261 hazardous Toxicity 0.000 claims description 2
- 238000000034 method Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000012552 review Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
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- 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 a transmitter power supply for process automation technology
- field devices are often used to detect and / or influence process variables.
- field devices are level gauges, mass flow meters, pressure and temperature measuring devices, pH redox potential measuring devices, conductivity meters, etc., which detect the corresponding process variables level, flow, pressure, temperature, pH or conductivity value as sensors.
- actuators z.
- valves that control the flow of a liquid in a pipe section or pumps that change the level in a container.
- the signal transmission between field devices and higher-level units is often based on the known 4-20 mA standard.
- the field devices are sensors, the measured values acquired by them are transmitted as a current signal via a signal line to the higher-level units.
- the measuring range of the sensors is linearly mapped to a 4-20 mA current signal. From the US 5,469,746 a measuring system for process automation technology is known.
- the power supply of the field devices via the 4-20 mA current signal, so that in addition to the signal line no additional supply line is necessary.
- this current signal is generated not in the higher-level unit but in a separate transmitter supply unit connected to the signal line (2-wire line).
- Intelligent field devices partly have extensive diagnostic functionalities, which, for. B. evaluate the loads of sensors or actuators, maintenance times determine and warn the user of the danger of an early failure of the field device.
- Such additional information about the current state of a sensor can not be transmitted with the conventional 4-20 mA technology, which only allows the transmission of a measured value or a control signal for a valve.
- This information can therefore only be displayed directly on the field device in plants based on the 4-20 mA technology.
- a signaling of additional information on the control system would only be guaranteed if a regular transmission of this additional information to the control system would take place.
- Communication between field devices and control systems is based on the HART standard according to the master slave principle, whereby field devices always act as slaves. By itself, a field device can thus not transmit additional information to the control system.
- the object of the invention is in field devices which are connected via signal line to a control system, additional information provided by field devices to represent reliably and safely in a separate unit from the field device without changes to the control system must be made.
- Transmitter supply for the process automation technology that is used to power a transmitter and for forwarding current signals that are transmitted between the transmitter and a parent unit via a signal line, characterized in that the transmitter supply SG connected via a modem to the signal line L microcontroller ⁇ C and a signaling device SE controlled by the microcontroller .mu.C, the signaling device SE serving to signal additional information supplied by the transmitter MU and transmitted to the microcontroller .mu.C via the signal line L.
- the essential idea of the invention is, in a transmitter power supply, a modem and a microcontroller provided with a signaling device connected to provide. This allows the transmitter power supply and the transmitter to communicate with each other. Additional information is transmitted from the transmitter to the transmitter power supply and signaled by the signaling device.
- a separation unit is provided in the measuring sum generator, which serves for the galvanic separation of the current signals transmitted between the measuring transducer and the control system.
- the signaling device is designed as a switching contact and / or as a display element.
- a transmitter power supply SG a transmitter MU and a control system LS, which serves as a parent unit, shown schematically.
- the transmitter MU may, for. B. to the temperature sensor TMT 162 Fa. Endress + Hauser act.
- Transmitter MU, transmitter supply SG and control system LS are connected to each other via a signal line L.
- this signal line L which in principle consists of two line sections L1 and L2, a current signal representing a measured value is forwarded by the transmitter MU via the transmitter supply SG to the control system LS. Both line sections thus each represent a 4-20 mA current loop.
- the transmitter power supply SG has a barrier EX in the signal path from the transmitter MU to the control system LS in accordance with the regulations on potentially explosive atmospheres, a separation unit TTE for galvanic isolation and a current source SQ.
- a HART modem M and a downstream microcontroller ⁇ C are additionally provided in the transmitter supply SG.
- the microcontroller ⁇ C is connected to a signaling device SE, which consists of an optical display element AE (eg LED diode) and a switching contact SK.
- a power supply NT To power the individual components of the transmitter power supply SG is a power supply NT.
- the power supply NT is also used to generate the Current signal that supplies power to the transmitter MU.
- the transmitter MU acquires a reading that is converted into a 4-20 mA current signal. This current signal is transmitted via the line section L1 to the transmitter supply SG and on via the line section L2 to the control system LS.
- control system LS z. B the measured value or generates a control signal for an actuator. If a limit value is exceeded, an alarm signal can also be generated.
- the transmitter MU In addition to the measured value, the transmitter MU also provides additional additional information essentially diagnostic information.
- the communication between the transmitter power supply SG and the transmitter MU takes place according to the HART standard.
- the Transmitter Supply Unit SG which acts as the Master, must periodically poll the MU Transmitter, which serves as the Slave.
- the assignment between these individual different additional information and a corresponding signaling can, for. This can be set, for example, via a switch (eg DIP switch), not shown, on the transmitter power supply SG or via appropriate parameters during the parameterization of the transmitter SG.
- a switch eg DIP switch
- the additional information is evaluated in the microcontroller .mu.C in accordance with the settings made and can then be signaled acoustically by the signaling device SE via the switching contact SK connected siren or via the display element AE with an LED diode.
- the transmitter supply unit SG according to the invention can be easily used in existing process plants for signaling additional information from field devices. Changes to the control systems are not necessary. Due to its design, the MU transmitter power supply is also suitable for intrinsically safe applications. From the transmitter MU there is a continuous monitoring of the state of a field device connected to this.
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- Arrangements For Transmission Of Measured Signals (AREA)
Description
Die Erfindung betrifft ein Messumformerspeisegerät für die ProzessautomatisierungstechnikThe invention relates to a transmitter power supply for process automation technology
In der Prozessautomatisierungstechnik werden vielfach Feldgeräte eingesetzt, die zur Erfassung und / oder Beeinflussung von Prozessvariablen dienen. Beispiele für derartige Feldgeräte sind Füllstandsmessgeräte, Massendurchflussmessgeräte, Druckund Temperaturmessgeräte, pH-Redoxpotential- Messgeräte, Leitfähigkeitsmessgeräte etc., die als Sensoren die entsprechenden Prozessvariablen Füllstand, Durchfluss, Druck, Temperatur, pH-Wert bzw. Leitfähigkeitswert erfassen.In process automation technology, field devices are often used to detect and / or influence process variables. Examples of such field devices are level gauges, mass flow meters, pressure and temperature measuring devices, pH redox potential measuring devices, conductivity meters, etc., which detect the corresponding process variables level, flow, pressure, temperature, pH or conductivity value as sensors.
Zur Beeinflussung von Prozessvariablen dienen so genannte Aktoren, z. B. Ventile, die den Durchfluss einer Flüssigkeit in einem Rohrleitungsabschnitt steuern oder Pumpen, die den Füllstand in einem Behälter ändern.To influence process variables so-called actuators, z. As valves that control the flow of a liquid in a pipe section or pumps that change the level in a container.
Eine Vielzahl solcher Feldgeräte wird von der Firma Endress + Hauser® hergestellt und vertrieben.A variety of such field devices is manufactured and sold by the company Endress + Hauser®.
Häufig sind Feldgeräte mit übergeordneten Einheiten z. B. Leitsystemen oder Steuereinheiten verbunden. Diese übergeordneten Einheiten dienen zur Prozesssteuerung, Prozessvisualisierung, Prozessüberwachung.Often field devices with higher-level units z. B. control systems or control units connected. These higher-level units are used for process control, process visualization, process monitoring.
Die Signalübertragung zwischen Feldgeräten und übergeordneten Einheiten erfolgt häufig nach dem bekannten 4-20 mA Standard.The signal transmission between field devices and higher-level units is often based on the known 4-20 mA standard.
Handelt es sich bei den Feldgeräten um Sensoren, so werden die von ihnen erfassten Messwerte als Stromsignal über eine Signalleitung an die übergeordneten Einheiten übertragen. Der Messbereich der Sensoren wird dabei linear auf ein 4-20 mA Stromsignal abgebildet. Aus der
Vielfach erfolgt die Energieversorgung der Feldgeräte über das 4-20 mA Stromsignal, so dass neben der Signalleitung keine zusätzliche Versorgungsleitung notwendig ist.In many cases, the power supply of the field devices via the 4-20 mA current signal, so that in addition to the signal line no additional supply line is necessary.
Normalerweise wird dieses Stromsignal nicht in der übergeordneten Einheit sondern in einem getrennten Messumformerspeisegerät, das mit der Signalleitung (2-Draht-Leitung) verbunden ist, erzeugt.Normally this current signal is generated not in the higher-level unit but in a separate transmitter supply unit connected to the signal line (2-wire line).
Für den Einsatz von Feldgeräten im Ex-Bereich sind gewisse Maßnahmen im Hinblick auf die Eigensicherheit notwendig. So erfolgt eine galvanische Trennung bei der Übertragung der Signale zwischen dem Leitsystem, das im sicheren Bereich angeordnet ist, und dem Feldgerät, das im eigensicheren Bereich angeordnet ist. In der Regel erfolgt die galvanische Trennung ebenfalls im Messumformerspeisegerät.The use of field devices in hazardous areas requires certain measures with regard to intrinsic safety. Thus, a galvanic separation takes place during the transmission of the signals between the control system, which is arranged in the safe area, and the field device, which is arranged in the intrinsically safe area. As a rule, galvanic isolation also takes place in the transmitter supply unit.
Intelligente Feldgeräte besitzen teiweise umfangreiche Diagnosefunktionalitäten, die z. B. die Belastungen von Sensoren bzw. Aktoren auswerten, Wartungszeitpunkte ermitteln und den Anwender auf die Gefahr eines baldigen Ausfalls des Feldgeräts hinweisen.Intelligent field devices partly have extensive diagnostic functionalities, which, for. B. evaluate the loads of sensors or actuators, maintenance times determine and warn the user of the danger of an early failure of the field device.
Solche Zusatzinformationen über den aktuellen Zustand eines Sensors können mit der herkömmlichen 4-20 mA Technik, die nur die Übertragung eines Messwerts bzw. eines Steuersignals für ein Ventil erlaubt, nicht übertragen werden.Such additional information about the current state of a sensor can not be transmitted with the conventional 4-20 mA technology, which only allows the transmission of a measured value or a control signal for a valve.
Eine Darstellung dieser Zusatzinformationen kann in Anlagen, die auf der 4-20 mA Technik basieren, deshalb nur direkt am Feldgerät erfolgen.This information can therefore only be displayed directly on the field device in plants based on the 4-20 mA technology.
Eine Möglichkeit Zusatzinformationen zu übertragen, bietet der HART-Standard. Hierbei wird ein alternierendes Stromsignal zur Übertragung von digitalen Daten dem analogen Stromsignal, das die Primär-Information darstellt, überlagert.One way of transmitting additional information is provided by the HART standard. Here, an alternating current signal for transmission of digital data is superimposed on the analog current signal representing the primary information.
Eine Signalisierung von Zusatzinformationen am Leitsystem wäre nur gewährleistet, wenn eine regelmäßige Übertragung dieser Zusatzinformationen an das Leitsystem stattfinden würde. Die Kommunikation zwischen Feldgeräten und Leitsystemen erfolgt bei dem HART-Standard nach dem Master Slave Prinzip, wobei Feldgeräte immer als Slaves fungieren. Von sich aus kann ein Feldgerät somit keine Zusatzinformationen an das Leitsystem übermitteln.A signaling of additional information on the control system would only be guaranteed if a regular transmission of this additional information to the control system would take place. Communication between field devices and control systems is based on the HART standard according to the master slave principle, whereby field devices always act as slaves. By itself, a field device can thus not transmit additional information to the control system.
Bestehende Anwendungen in Leitsystemen dahingehend zu erweitern, dass Zusatzinformationen von den Feldgeräten abgefragt werden, ist teilweise sehr aufwendig.Extending existing applications in control systems to the extent that additional information is queried by the field devices is sometimes very expensive.
Viele Leitsystemanwendungen arbeiten noch nicht nach dem HART-Standard sondern sind nur für eine analoge 4-20 mA Signalübertragung ausgelegt.Many control system applications are not yet working according to the HART standard but are only designed for 4-20 mA analog signal transmission.
Aufgabe der Erfindung ist es bei Feldgeräten die über Signalleitung mit einem Leitsystem verbunden sind, Zusatzinformationen die von Feldgeräten bereitgestellt werden, in einer vom Feldgerät separaten Einheit zuverlässig und sicher darzustellen, ohne dass Änderungen am Leitsystem vorgenommen werden müssen.The object of the invention is in field devices which are connected via signal line to a control system, additional information provided by field devices to represent reliably and safely in a separate unit from the field device without changes to the control system must be made.
Gelöst wird diese Aufgabe durch folgende im Anspruch 1 angegebenen Merkmale.This object is achieved by the following features specified in claim 1.
Messumformerspeisegerät für die Prozessautomatisierungstechnik das zur Energieversorgung eines Messumformers und zur Weiterleitung von Stromsignalen, die zwischen dem Messumformer und einer übergeordneten Einheit über eine Signalleitung übertragen werden, dient, dadurch gekennzeichnet, dass das Messumformerspeisegerät SG einen über ein Modem an die Signalleitung L angeschlossenen Mikrocontroller µC und eine vom Mikrocontroller µC angesteuerte Signalisierungseinrichtung SE aufweist, wobei die Signalisierungseinrichtung SE zur Signalisierung von Zusatzinformationen, die vom Messumformer MU geliefert und an den Mikrocontroller µC über die Signalleitung L übertragen werden, dient.Transmitter supply for the process automation technology that is used to power a transmitter and for forwarding current signals that are transmitted between the transmitter and a parent unit via a signal line, characterized in that the transmitter supply SG connected via a modem to the signal line L microcontroller μC and a signaling device SE controlled by the microcontroller .mu.C, the signaling device SE serving to signal additional information supplied by the transmitter MU and transmitted to the microcontroller .mu.C via the signal line L.
Vorteilhafte Weiterentwicklungen dererfindung sind in den Unteransprüchen angegeben.Advantageous further developments of the invention are specified in the subclaims.
Die wesentliche Idee der Erfindung besteht darin, in einem Messumformerspeisegerät ein Modem und einen Mikrocontroller, der mit einer Signalisierungseinrichtung verbunden ist, vorzusehen. Damit können das Messumformerspeisegerät und der Messumformer miteinander kommunizieren. Zusatzinformationen werden vom Messumformer an das Messumformerspeisegerät übertragen und mit Hilfe der Signalisierungseinrichtung signalisiert.The essential idea of the invention is, in a transmitter power supply, a modem and a microcontroller provided with a signaling device connected to provide. This allows the transmitter power supply and the transmitter to communicate with each other. Additional information is transmitted from the transmitter to the transmitter power supply and signaled by the signaling device.
In einer Weiterentwicklung der Erfindung ist im Messumfomerspeisegerät eine Trenneinheit vorgesehen, die zur galvanischen Trennung der zwischen Messumformer und Leitsystem übertragenen Stromsignale dient.In a further development of the invention, a separation unit is provided in the measuring sum generator, which serves for the galvanic separation of the current signals transmitted between the measuring transducer and the control system.
In einer Weiterentwicklung der Erfindung ist die Signalisierungsvorrichtung als Schaltkontakt und/oder als Anzeigeelement ausgelegt.In a further development of the invention, the signaling device is designed as a switching contact and / or as a display element.
Nachfolgend ist die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert.The invention is explained in more detail with reference to an embodiment shown in the drawing.
Es zeigt:
- Fig. 1 Blockschaltbild eines erfindungsgemäßen
- Fig. 1 block diagram of an inventive
Messumformerspeisegeräts mit Messumformer und Leitsystem.Transmitter power supply with transmitter and control system.
In Fig. 1 sind ein Messumformerspeisegerät SG, ein Messumformer MU und ein Leitsystem LS, das als übergeordnete Einheit dient, schematisch dargestellt. Bei dem Messumformer MU kann es sich z. B. um den Temperatursensor TMT 162 der Fa. Endress + Hauser handeln.In Fig. 1, a transmitter power supply SG, a transmitter MU and a control system LS, which serves as a parent unit, shown schematically. The transmitter MU may, for. B. to the temperature sensor TMT 162 Fa. Endress + Hauser act.
Messumformer MU, Messumformerspeisegerät SG und Leitsystem LS sind über eine Signalleitung L miteinander verbunden. Über diese Signalleitung L, die prinzipiell aus zwei Leitungsabschnitten L1 und L2 besteht, wird ein Stromsignal, das einen Messwert repräsentiert, vom Messumformer MU über das Messumformerspeisegerät SG zum Leitsystem LS weitergeleitet. Beide Leitungsabschnitte stellen somit jeweils eine 4-20 mA Stromschleife dar.Transmitter MU, transmitter supply SG and control system LS are connected to each other via a signal line L. Via this signal line L, which in principle consists of two line sections L1 and L2, a current signal representing a measured value is forwarded by the transmitter MU via the transmitter supply SG to the control system LS. Both line sections thus each represent a 4-20 mA current loop.
Wie viele andere Messumformerspeisegeräte weist das Messumformerspeisegerät SG im Signalweg vom Messumformer MU zum Leitsystem LS eine Barriere EX entsprechend den Vorschriften über explosionsgefährdete Bereiche, eine Trenneinheit TTE zur galvansichen Trennung und eine Stromquelle SQ auf.Like many other transmitter power supplies, the transmitter power supply SG has a barrier EX in the signal path from the transmitter MU to the control system LS in accordance with the regulations on potentially explosive atmospheres, a separation unit TTE for galvanic isolation and a current source SQ.
Erfindungsgemäß sind zusätzlich im Messumformerspeisegerät SG ein HART-Modem M und ein nachgeschalteten Mikrocontroller µC vorgesehen. Der Mikrocontroller µC ist mit einer Signalisierungseinrichtung SE verbunden, die aus einem optischen Anzeigeelement AE (z. B. LED-Diode) und einem Schaltkontakt SK besteht. Zur Energieversorgung der einzelnen Komponenten des Messumformerspeisegeräts SG dient ein Netzteil NT. Das Netzteil NT dient auch zur Erzeugung des Stromsignals das den Messumformer MU mit Energie versorgt.According to the invention, a HART modem M and a downstream microcontroller μC are additionally provided in the transmitter supply SG. The microcontroller μC is connected to a signaling device SE, which consists of an optical display element AE (eg LED diode) and a switching contact SK. To power the individual components of the transmitter power supply SG is a power supply NT. The power supply NT is also used to generate the Current signal that supplies power to the transmitter MU.
Nachfolgend ist die Funktion des Messsystems näher erläutert.The function of the measuring system is explained in more detail below.
Der Messumformer MU erfasst einen Messwert, der in ein 4-20 mA Stromsignal umgewandelt wird. Dieses Stromsignal wird über die Leitungsabschnitt L1 zum Messumformerspeisegerät SG und weiter über den Leitungsabschnitt L2 zum Leitsystem LS übertragen.The transmitter MU acquires a reading that is converted into a 4-20 mA current signal. This current signal is transmitted via the line section L1 to the transmitter supply SG and on via the line section L2 to the control system LS.
Im Leitsystem LS wird z. B. der Messwert visualisiert bzw. ein Steuersignal für einen Aktor erzeugt. Wird ein Grenzwert überschritten kann auch ein Alarmsignal erzeugt werden.In the control system LS z. B. the measured value or generates a control signal for an actuator. If a limit value is exceeded, an alarm signal can also be generated.
Der Messumformer MU stellt neben dem Messwert noch weitere Zusatzinformationen im Wesentlichen Diagnoseinformationen zur Verfügung.In addition to the measured value, the transmitter MU also provides additional additional information essentially diagnostic information.
Die Kommunikation zwischen dem Messumformerspeisegerät SG und dem Messumformer MU erfolgt wie bereits erwähnt nach dem HART-Standard.As already mentioned, the communication between the transmitter power supply SG and the transmitter MU takes place according to the HART standard.
Um die Zusatzinformationen zu erhalten, muss das Messumformerspeisegerät SG, das als Master fungiert, in regelmäßigen Abständen den Messumformer MU, der als Slave dient, abfragen.To obtain the additional information, the Transmitter Supply Unit SG, which acts as the Master, must periodically poll the MU Transmitter, which serves as the Slave.
Es sind verschiedene Stufen bei der Zusatzinformation, die der Messumformer MU liefert, denkbar; "in Ordnung", "Überprüfung empfohlen", "Überprüfung erforderlich", "Überprüfung dringend erforderlich-Messwert unsicher".There are various levels in the additional information that the transmitter MU supplies imaginable; "okay", "review recommended", "review required", "review urgently needed-measured uncertain".
Die Zuordnung zwischen diesen einzelnen unterschiedlichen Zusatzinformationen und einer entsprechenden Signalisierung kann z. B. über einen nicht dargestellten Schalter (z. B. DIP-Schalter) am Messumformerspeisegerät SG oder über entsprechende Parameter bei der Parametrierung des Messumformerspeisegeräts SG eingestellt werden.The assignment between these individual different additional information and a corresponding signaling can, for. This can be set, for example, via a switch (eg DIP switch), not shown, on the transmitter power supply SG or via appropriate parameters during the parameterization of the transmitter SG.
Die Zusatzinformation wird im Mikrocontroller µC entsprechend den getätigten Einstellungen ausgewertet und kann dann entsprechend durch die Signalisierungseinrichtung SE über den Schaltkontakt SK geschaltete Sirene akustisch oder über das Anzeigeelement AE mit einer LED-Diode optisch signalisiert werden.The additional information is evaluated in the microcontroller .mu.C in accordance with the settings made and can then be signaled acoustically by the signaling device SE via the switching contact SK connected siren or via the display element AE with an LED diode.
Das erfindungsgemäße Messumformerspeisegerät SG kann einfach in vorhandenen Prozessanlagen zur Signalisierung von Zusatzinformationen von Feldgeräten eingesetzt werden. Änderungen an den Leitsystemen sind hierbei nicht notwendig. Das Messumformerspeisegerät MU ist aufgrund seines Aufbaus auch für eigensichere Anwendungen geeignet. Vom Messumformer MU aus erfolgt dabei eine kontinuierliche Überwachung des Zustandes eines an diesen angeschlossenen Feldgeräts.The transmitter supply unit SG according to the invention can be easily used in existing process plants for signaling additional information from field devices. Changes to the control systems are not necessary. Due to its design, the MU transmitter power supply is also suitable for intrinsically safe applications. From the transmitter MU there is a continuous monitoring of the state of a field device connected to this.
Claims (8)
- Transmitter power supply unit for process automation technology which is used to supply power to a transmitter and to forward current signals which are transmitted between the transmitter and a higher-order unit via a signal line, characterized in that
a power unit (NT) is provided, said power unit serving to generate a current signal which provides power to the transmitter (MU), wherein the current signal represents a measured value and is transmitted by the transmitter (MU) to the control system (LS) via the transmitter power supply unit (SG),
in that the transmitter power supply unit (SG) has a microcontroller (µC) connected to the signal line (L) via a modem and a signaling unit (SE) which is controlled by the microcontroller (µC), wherein the signaling unit (SE) is used to signal additional information which is provided by the transmitter (MU) and is transmitted to the microcontroller (µC) via the signal line (L). - Transmitter power supply unit as claimed in Claim 1, characterized in that the power unit (NT) is used to supply power to individual components of the transmitter power supply unit (SG).
- Transmitter power supply unit as claimed in Claim 1 or 2, characterized in that the current signal that represents the measured value is transmitted via the signal line (L) - which consists of two line sections (L1) and (L2) - from the transmitter (MU) to the control system (LS) via the transmitter power supply unit (SG), wherein the two line sections (L1, L2) each represent a 4-20 mA current loop.
- Transmitter power supply unit as claimed in Claim 1, 2 or 3, characterized in that the additional information is transmitted in digital format as a HART signal via the signal line, wherein the transmitter power supply unit (SG) acts as a master and regularly polls the transmitter (MU), acting as a slave, in order to obtain the additional information.
- Transmitter power supply unit as claimed in Claim 1, 2, 3 or 4, characterized in that the transmitter power supply unit (SG) has a barrier EX along the signal path from the transmitter (MU) to the control system (LS), said barrier complying with the specifications for hazardous areas, an isolation unit (TE) for galvanic isolation and a current source (SQ).
- Transmitter power supply unit as claimed in Claim 1, characterized in that an isolation unit (TE) is provided in the power supply unit (SG) for galvanic isolation of the current signals transmitted via the signal line (L).
- Transmitter power supply unit as claimed in one of the previous claims, characterized in that the signaling unit (SE) has a switch contact (SK) and/or a display element (AE).
- Measuring system comprising a transmitter power supply unit as claimed in one of the previous claims, a transmitter and a control system.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005016141 | 2005-04-07 | ||
| DE102005027047A DE102005027047A1 (en) | 2005-06-10 | 2005-06-10 | Measuring transducer feeder for use in process automation technology, has signaling device signaling additional information, which is supplied by measuring transducer, and transmitting information to microcontroller via signal line |
| PCT/EP2006/061071 WO2006106055A2 (en) | 2005-04-07 | 2006-03-28 | Feeder for a measuring transducer for use in process automation technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1866887A2 EP1866887A2 (en) | 2007-12-19 |
| EP1866887B1 true EP1866887B1 (en) | 2015-01-28 |
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ID=37025107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06725336.9A Not-in-force EP1866887B1 (en) | 2005-04-07 | 2006-03-28 | Feeder for a measuring transducer for use in process automation technology |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20090216496A1 (en) |
| EP (1) | EP1866887B1 (en) |
| WO (1) | WO2006106055A2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006055396A1 (en) * | 2006-11-22 | 2008-05-29 | Endress + Hauser Gmbh + Co. Kg | Signal separation unit for a two-wire process control loop |
| DE102016122714A1 (en) * | 2016-11-24 | 2018-05-24 | Endress + Hauser Wetzer Gmbh + Co Kg | Communication adapter for a transmitter of a field device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5469746A (en) * | 1993-03-30 | 1995-11-28 | Hitachi, Ltd. | Electromagnetic flow meter |
| FR2727230B1 (en) * | 1994-11-18 | 1996-12-20 | Commissariat Energie Atomique | DEVICE FOR ADAPTING SENSORS OR ACTUATORS OF THE "HART" TYPE WITH A LOCAL INDUSTRIAL NETWORK OF THE "FIP" TYPE AND METHOD OF IMPLEMENTING THIS DEVICE |
| US6611775B1 (en) * | 1998-12-10 | 2003-08-26 | Rosemount Inc. | Electrode leakage diagnostics in a magnetic flow meter |
| US6765968B1 (en) * | 1999-09-28 | 2004-07-20 | Rosemount Inc. | Process transmitter with local databus |
| US7773715B2 (en) * | 2002-09-06 | 2010-08-10 | Rosemount Inc. | Two wire transmitter with isolated can output |
-
2006
- 2006-03-28 WO PCT/EP2006/061071 patent/WO2006106055A2/en active Application Filing
- 2006-03-28 US US11/887,742 patent/US20090216496A1/en not_active Abandoned
- 2006-03-28 EP EP06725336.9A patent/EP1866887B1/en not_active Not-in-force
Also Published As
| Publication number | Publication date |
|---|---|
| US20090216496A1 (en) | 2009-08-27 |
| EP1866887A2 (en) | 2007-12-19 |
| WO2006106055A3 (en) | 2007-01-18 |
| WO2006106055A2 (en) | 2006-10-12 |
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