EP0295593A2 - Individual identification - Google Patents
Individual identification Download PDFInfo
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- EP0295593A2 EP0295593A2 EP88109332A EP88109332A EP0295593A2 EP 0295593 A2 EP0295593 A2 EP 0295593A2 EP 88109332 A EP88109332 A EP 88109332A EP 88109332 A EP88109332 A EP 88109332A EP 0295593 A2 EP0295593 A2 EP 0295593A2
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- Prior art keywords
- line
- detectors
- detector
- signaling
- individual identification
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- 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.)
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/02—Monitoring continuously signalling or alarm systems
- G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/018—Sensor coding by detecting magnitude of an electrical parameter, e.g. resistance
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/04—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using a single signalling line, e.g. in a closed loop
Definitions
- the invention relates to an individual identification of a plurality of detectors arranged in a two-wire detection line with closable contacts, in particular fire detectors in fire detection systems.
- Optical displays arranged on detectors are relatively inexpensive to implement. However, in extensive systems, for example with 100 or more detectors, the search for a visual display of an addressed detector is quite time-consuming. Other systems lead a line from each signaling contact to a central point. This enables quick identification; however, the installation effort is considerable for such a system.
- the invention has for its object to avoid the above disadvantages and to create an individual display that can be realized with the simplest means and reliably.
- each detector a diode is assigned to each closable contact and one of the cores of the signaling line has a signaling resistance, the cores of the signaling line being terminated by means of a line with a terminal resistor, and in that the line voltage is via a constant current generator fed signal line is periodically or aperiodically inverted by means of an inverter, the voltage being fed to a voltage measurement with a message display and, via a comparator chain, to an evaluation circuit with a fault and alarm line.
- each detector consists of only one contact and two cheap passive components.
- Several such detectors can be arranged in an unprotected two-wire signaling line.
- Each triggered detector has the value "1", this value increasing depending on the sequence of the detectors arranged in the signaling line by the number of detectors located in front of the addressed detector in the course of the signaling line. This means that in a signaling line with, for example, 10 detectors, the detector in sixth position, when activated, reports the value six to the control center.
- the evaluation circuit can display the value digitally or analogously, or (with a corresponding program) output it alphanumerically.
- a subsequent increase or decrease in the number of detectors is possible without interfering with the detector or the evaluation device.
- the evaluation device After the evaluation device has responded, it starts running Test cycle. If the signal line is short-circuited, the same resistance value is measured during the inversion of the line voltage as before the inversion. This leads to an error message.
- the value of the terminating resistor is measured when the line voltage is inverted, the previous value is a closed signal contact; this leads to the corresponding output signal and the measured resistance value is displayed as a signal location and displayed as a number.
- the price for the two additional components installed in the detector is only a fraction of the price for the detector. Installation is extremely simple and interference-free. Each reporting location is e.g. using a site plan with numbers to locate it immediately when the message signal appears.
- Such a device is ideally suited for monitoring slide positions, as are required for sprinkler systems.
- Extinguishing systems in which shrinkage detectors are required for extinguishing agents can also be implemented cost-effectively.
- the invention has the further advantage that the individual detectors do not have to be set individually on the construction site.
- a slide-in module can be used which, in addition to the usual displays for system faults and line faults, contains a digital display that shows the number of the signaling contact addressed in the event of a system fault.
- Each insert can monitor several detectors. The usual double wire is sufficient for the connection between the control panel and the detectors.
- the exemplary embodiment shows a fire alarm system which consists on the one hand of an alarm line L and on the other hand of a fire alarm system Z.
- the signal line L with the cores BC is terminated by the end line E with the terminating resistor RE.
- a current flows through the signal line L and is determined by the constant current generator I.
- there is a voltage at the input terminals of the signal line L the value of which depends on the addition of all signaling resistors RM and the terminal resistor RE. This voltage is fed to the voltage measurement G and, via a comparator chain Q with the comparators KUA, to an evaluation circuit N.
- the built-in detector contact S closes.This changes the number of detector resistors RM connected in series and thus also the total resistance of the signal line L through which the constant current flows.
- the evaluation N is controlled via the comparator A of the comparator chain Q, so that an alarm message via P is issued.
- the voltage measurement G and the message display H are activated. A number appears in the display H; this number depends on the measured voltage. Since this in turn depends on the number of resistors RM connected in series in the signal line L at the time of the alarm, this number can serve as identification of the addressed detector M.
- the conversion of the measured voltage into the display digit is expediently designed such that a "1" is synonymous with the first detector M arranged in the message line L, a "2" is the same as the second detector. This ensures that all detectors M have identical resistance RM and that no adjustment is necessary after installing or expanding a detection line.
- the alarm message sent via P can, for example, open an alarm valve of a sprinkler system and thus start the extinguishing process in the event of a fire via the sprinkler system.
- a diode D is connected in series with each signaling contact.
- the feed of the signal line L is periodically inverted in polarity by an inverter I.
- a comparative voltage is applied to the comparator chain Q only by the turnaround time of the pole inverter operated by the inverter I.
- the value of this voltage is essentially determined by the resistor RE, the value of which is greater than the sum of all the resistors RM which are possible in a detection line. In the event of a line break, no current flows through this terminating resistor RE.
- An interference signal above 0 is emitted via the comparator U of the comparator chain Q and the evaluation N. If the signal line L is short-circuited, the line voltage will drop due to the then bridged resistor RE and possibly a part of the resistor RM. This causes the comparator K of the comparator chain Q to respond and an error message to be issued.
- the line voltage which fluctuates periodically, triggers the comparator A of the comparator chain Q and, via the evaluation N, releases the voltage measurement G with the subsequent message display in H.
- This ensures that a short circuit in the signal line L - as required by the relevant regulations - cannot lead to an alarm message and thus to an alarm being triggered.
- only two passive components are required in the mutually identical detectors in order to signal the required individual display of the actuated detector. Also, if the number of detectors M in a detection line L is subsequently changed, no adjustment of the central station Z or manipulation of the detectors M is necessary.
Abstract
Description
Die Erfindung betrifft eine Einzelidentifikation von mehreren in einer Doppelader-Meldeleitung angeordneten Meldegebern mit schließbaren Kontakten, insbesondere von Brandmeldern in Brandmeldeanlagen.The invention relates to an individual identification of a plurality of detectors arranged in a two-wire detection line with closable contacts, in particular fire detectors in fire detection systems.
In vielen Einsatzfällen bei Prozeßsteuerungen, Meß- und Regelanlagen, sowie automatischen Feuerlöschanlagen werden Meldekontakte verwendet, welche die ordnungsgemäße Funktion oder die Stellung von Stellgliedern signalisieren.In many applications with process controls, measuring and control systems, as well as automatic fire extinguishing systems, signaling contacts are used which signal the correct function or the position of actuators.
Wenn mehrere solcher Meldekontakte in einer Anlage verwendet werden, ist es notwendig, bei einer vom Normalfall abweichenden Signalisierung möglichst schnell den Störort zu erkennen. Dies kann durch an jedem Kontakt angeordnete optische Anzeige oder durch eine Fernübertragung der Melderidentifikation erfolgen.If several such signaling contacts are used in a system, it is necessary to identify the fault location as quickly as possible if the signaling deviates from the normal case. This can be done by an optical display on each contact or by remote transmission of the detector identification.
An Meldern angeordnete optische Anzeigen sind relativ preiswert zu realisieren. Jedoch ist in umfangreichen Anlagen, z.B. bei 100 und mehr Meldern die Suche nach einer optischen Anzeige eines angesprochenen Melders recht zeitaufwendig. Andere Systeme führen von jedem Meldekontakt eine Leitung zu einer zentralen Stelle. Dadurch ist eine schnelle Identifikation möglich; der Installationsaufwand ist jedoch für ein solches System erheblich.Optical displays arranged on detectors are relatively inexpensive to implement. However, in extensive systems, for example with 100 or more detectors, the search for a visual display of an addressed detector is quite time-consuming. Other systems lead a line from each signaling contact to a central point. This enables quick identification; however, the installation effort is considerable for such a system.
Moderne Digitalsysteme benötigen nur eine Doppeladerleitung, jedoch ist dabei sowohl bei den einzelnen Meldern, als auch bei der Auswertung in der Zentrale ein erheblicher elektronischer Aufwand notwendig. Außerdem ist im allgemeinen eine störsichere spezielle Installationsleitung erforderlich. Des weiteren muß bei derartigen Anlagen jeder Melder nach der Installation manuell auf die Individualkennung eingestellt werden.Modern digital systems only require a two-wire line, however, a considerable amount of electronic effort is required both for the individual detectors and for the evaluation in the control center. In addition, an interference-proof special installation line is generally required. Furthermore, in such systems, each detector must be manually set to the individual identifier after installation.
Eine Individualerkennung mit schließenden Kontakten ist bekannt (DE-OS 32 11 550). Bei dieser Erkennung ist jedoch keine Differenzierung zwischen einem Leitungskurzschluß und einem geschlossenen Meldekontakt möglich.An individual recognition with closing contacts is known (DE-OS 32 11 550). With this detection, however, it is not possible to differentiate between a line short circuit and a closed signal contact.
Der Erfindung liegt die Aufgabe zugrunde, die vorstehenden Nachteile zu vermeiden und eine Individualanzeige zu schaffen, die mit einfachsten Mitteln und zuverlässig zu verwirklichen ist.The invention has for its object to avoid the above disadvantages and to create an individual display that can be realized with the simplest means and reliably.
Diese Aufgabe wird dadurch gelöst, daß in jedem Melder jedem schließbaren Kontakt eine Diode zugeordnet ist und eine der Adern der Meldeleitung jeweils einen Meldewiderstand aufweist, wobei die Adern der Meldeleitung mittels einer Leitung mit einem Endwiderstand abgeschlossen sind, und daß die Linienspannung der über einen Konstantstromgenerator gespeisten Meldeleitung mittels eines Inverters periodisch oder aperiodisch invertiert wird, wobei die Spannung einer Spannungsmessung mit Meldeanzeige und über eine Comparatorkette einer Auswertschaltung mit Stör- und Alarmleitung zugeführt wird.This object is achieved in that in each detector, a diode is assigned to each closable contact and one of the cores of the signaling line has a signaling resistance, the cores of the signaling line being terminated by means of a line with a terminal resistor, and in that the line voltage is via a constant current generator fed signal line is periodically or aperiodically inverted by means of an inverter, the voltage being fed to a voltage measurement with a message display and, via a comparator chain, to an evaluation circuit with a fault and alarm line.
Zur Folge dieser Maßnahme besteht jeder Melder nur aus einem Kontakt und zwei billigen passiven Bauelementen. Es können mehrere derartiger Melder in einer ungeschützten Doppelader-Meldeleitung angeordnet sein. Dabei hat jeder ausgelöste Melder den Wert "1", wobei sich dieser Wert in Abhängigkeit von der Reihenfolge der in der Meldeleitung angeordneten Melder jeweils um die Anzahl der vor dem angesprochenen Melder im Zuge der Meldeleitung liegenden Meldern erhöht. Dies bedeutet, daß in einer Meldeleitung mit beispielsweise 10 Meldern, der an sechster Stelle liegende Melder im Falle der Aktivierung den Wert sechs zur Zentrale meldet. Bei den übrigen Meldern verhält es sich ebenso. Die Auswertschaltung kann den Wert digital oder analog anzeigen oder (mit einem entsprechenden Programm) alphanumerisch ausgeben.As a result of this measure, each detector consists of only one contact and two cheap passive components. Several such detectors can be arranged in an unprotected two-wire signaling line. Each triggered detector has the value "1", this value increasing depending on the sequence of the detectors arranged in the signaling line by the number of detectors located in front of the addressed detector in the course of the signaling line. This means that in a signaling line with, for example, 10 detectors, the detector in sixth position, when activated, reports the value six to the control center. The same applies to the other detectors. The evaluation circuit can display the value digitally or analogously, or (with a corresponding program) output it alphanumerically.
Eine nachträgliche Erhöhung oder Verminderung der Anzahl der Melder ist ohne Eingriffe in die Melder oder die Auswerteinrichtung möglich.A subsequent increase or decrease in the number of detectors is possible without interfering with the detector or the evaluation device.
Mit der Erfindung ist eine einfache und preiswerte Lösung für die Individualanzeige gefunden, die in der Lage ist, den Vorschriften entsprechend zwischen einer Leitungsstörung in Form eines Kurzschlußes oder eine Unterbrechung und einer Meldung, beispielsweise einer Gefahrenmeldung unterscheiden zu können.With the invention, a simple and inexpensive solution for the individual display has been found, which is able to differentiate according to the regulations between a line fault in the form of a short circuit or an interruption and a message, for example a hazard message.
Nach dem Ansprechen der Auswerteinrichtung läuft zunächst ein Prüfzyklus ab. Bei einem Kurzschluß der Meldeleitung wird während der Invertierung der Linienspannung der gleiche Widerstandswert wie vor der Invertierung gemessen. Dies führt zu einer Störungsmeldung.After the evaluation device has responded, it starts running Test cycle. If the signal line is short-circuited, the same resistance value is measured during the inversion of the line voltage as before the inversion. This leads to an error message.
Wenn bei der Invertierung der Linienspannung der Wert des Abschlußwiderstandes gemessen wird, so handelt es sich beim vorangegangenen Wert um einen geschlossenen Signalkontakt; dies führt zum entsprechenden Ausgangsignal und der gemessene Widerstandswert wird als Signalort zur Anzeige gebracht und als Ziffer angezeigt.If the value of the terminating resistor is measured when the line voltage is inverted, the previous value is a closed signal contact; this leads to the corresponding output signal and the measured resistance value is displayed as a signal location and displayed as a number.
Der Preis für die in den Meldern zusätzlich eingebauten beiden Bauelemente ist nur ein Bruchteil des Preises für den Melder. Die Installation ist äußerst einfach und störsicher. Jeder Meldeort ist z.B. anhand eines mit Zahlen versehenen Lageplanes sofort bei Erscheinen des Meldesignales zu lokalisieren.The price for the two additional components installed in the detector is only a fraction of the price for the detector. Installation is extremely simple and interference-free. Each reporting location is e.g. using a site plan with numbers to locate it immediately when the message signal appears.
Eine solche Einrichtung ist hervorragend zur Überwachung von Schieberstellungen geeignet, wie sie für Sprinkleranlagen gefordert werden. Auch Löschanlagen, in denen Schwundmelder für Löschmittel gefordert werden, können damit kostensparend realisiert werden.Such a device is ideally suited for monitoring slide positions, as are required for sprinkler systems. Extinguishing systems in which shrinkage detectors are required for extinguishing agents can also be implemented cost-effectively.
Im Gegensatz zu bekannten Systemen, bei denen eine komplexe elektronische Baugruppe in jedem Melder installiert sein muß, bringt die Erfindung den weiteren Vorteil, daß keine individuelle Einstellung der Einzelmelder auf der Baustelle zu erfolgen hat. Für eine Anzeige in der Brandmeldezentrale kann ein Einschub verwendet werden, der neben den üblichen Anzeigen für Anlagenstörung und Leitungsstörung eine Digitalanzeige enthält, die bei Anlagenstörung die Nummer des angesprochenen Meldekontaktes anzeigt. Dabei kann jeder Einschub mehrere Melder überwachen. Für die Verbindung zwischen Zentrale und den Meldern reicht die übliche Doppeladerleitung aus.In contrast to known systems, in which a complex electronic assembly must be installed in each detector, The invention has the further advantage that the individual detectors do not have to be set individually on the construction site. For a display in the fire alarm control panel, a slide-in module can be used which, in addition to the usual displays for system faults and line faults, contains a digital display that shows the number of the signaling contact addressed in the event of a system fault. Each insert can monitor several detectors. The usual double wire is sufficient for the connection between the control panel and the detectors.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend näher beschrieben.An embodiment of the invention is shown in the drawing and will be described in more detail below.
Das Ausführungsbeispiel zeigt eine Brandmeldeanlage, die einerseits aus einer Meldeleitung L und andererseits aus einer Brandmeldeanlage Z besteht.The exemplary embodiment shows a fire alarm system which consists on the one hand of an alarm line L and on the other hand of a fire alarm system Z.
Die Meldeleitung L mit den Adern BC wird durch die Endleitung E mit dem Endwiderstand RE abgeschlossen. Durch die Meldeleitung L fließt ein Strom, der durch den Konstantstromgenerator I bestimmt wird. Dadurch liegt an den Eingangsklemmen der Meldeleitung L eine Spannung, deren Wert abhängig ist von der Addition aller Meldewiderstände RM und dem Endwiderstand RE. Diese Spannung wird der Spannungsmessung G und über eine Comparatorkette Q mit den Comparatoren KUA einer Auswertschaltung N zugeführt.The signal line L with the cores BC is terminated by the end line E with the terminating resistor RE. A current flows through the signal line L and is determined by the constant current generator I. As a result, there is a voltage at the input terminals of the signal line L, the value of which depends on the addition of all signaling resistors RM and the terminal resistor RE. This voltage is fed to the voltage measurement G and, via a comparator chain Q with the comparators KUA, to an evaluation circuit N.
Wenn nun einer der im Zuge der Meldeleitung L angeordneten Mel der 1 bis n anspricht, so schließt der eingebaute Melderkontakt S. Dadurch ändert sich die Anzahl der in Serie geschalteten Melderwiderstände RM und damit auch der Gesamtwiderstand der vom Konstantstrom durchflossenen Meldeleitung L. Somit ändert sich zwangsläufig die an den Eingangsklemmen der Meldeleitung L liegende Linienspannung. Über den Comparator A der Comparatorkette Q wird die Auswertung N angesteuert, so daß eine Alarmmeldung über P abgesetzt wird. Gleichzeitig wird die Spannungsmessung G und die Meldeanzeige H aktiviert. In der Anzeige H erscheint eine Ziffer; diese Ziffer ist abhängig von der gemessenen Spannung. Da diese wiederum abhängig ist von der Anzahl der in der Meldeleitung L zum Alarmzeitpunkt in Serie geschalteten Widerstände RM, kann diese Ziffer als Identifikation des angesprochenen Melders M dienen. Zweckmäßigerweise wird die Umsetzung der gemessenen Spannung in die Anzeigeziffer so ausgelegt, daß eine "1" gleichbedeutend ist mit dem ersten in der Meldeleitung L angeordneten Melder M, eine "2" gleicht dem zweiten Melder. Damit ist sichergestellt, daß alle Melder M identische Meldewiderstände RM haben und keinerlei Anpassung nach der Installation oder nach der Erweiterung einer Meldelinie notwendig ist. Die über P abgesetzte Alarmmeldung kann beispielsweise ein Alarmventil einer Sprinkleranlage öffnen und damit den Löschvorgang im Brandfalle über die Sprinkleranlage in Gang setzen.If one of the Mel which responds 1 to n, the built-in detector contact S closes.This changes the number of detector resistors RM connected in series and thus also the total resistance of the signal line L through which the constant current flows. The evaluation N is controlled via the comparator A of the comparator chain Q, so that an alarm message via P is issued. At the same time the voltage measurement G and the message display H are activated. A number appears in the display H; this number depends on the measured voltage. Since this in turn depends on the number of resistors RM connected in series in the signal line L at the time of the alarm, this number can serve as identification of the addressed detector M. The conversion of the measured voltage into the display digit is expediently designed such that a "1" is synonymous with the first detector M arranged in the message line L, a "2" is the same as the second detector. This ensures that all detectors M have identical resistance RM and that no adjustment is necessary after installing or expanding a detection line. The alarm message sent via P can, for example, open an alarm valve of a sprinkler system and thus start the extinguishing process in the event of a fire via the sprinkler system.
Um eine Unterscheidung zwischen einem geschlossenen Meldekon takt und einem Kurzschluß in der Meldeleitung L, z.B. zwischen zwei Meldern zu ermöglichen, ist in Serie zu jedem Meldekontakt eine Diode D geschaltet. Die Einspeisung der Meldeleitung L wird durch einen Inverter I periodisch in der Polarität invertiert. Im Normalbetrieb der Meldeleitung L liegt an der Comparatorkette Q eine nur durch die Umschlagzeit des vom Inverter I betriebenen Polwenders unterbrochene Gleichspannung an. Der Wert dieser Spannung wird im wesentlichen durch den Widerstand RE bestimmt, dessen Wert größer als die Summe aller in einer Meldelinie möglichen Widerstände RM ist. Bei einer Leitungsunterbrechung fließt kein Strom über diesen Endwiderstand RE. Über den Comparator U der Comparatorkette Q und die Auswertung N wird ein Störsignal über 0 abgegeben. Bei einem Kurzschluß der Meldeleitung L wird aufgrund des dann überbrückten Widerstandes RE und gegebenenfalls eines Teiles der widerstände RM die Linienspannung sinken. Dies führt zum Ansprechen des Comparators K der Comparatorkette Q und zum Absetzen einer Störungsmeldung.To differentiate between a closed signaling con clock and a short circuit in the signal line L, for example between two detectors, a diode D is connected in series with each signaling contact. The feed of the signal line L is periodically inverted in polarity by an inverter I. In normal operation of the signal line L, a comparative voltage is applied to the comparator chain Q only by the turnaround time of the pole inverter operated by the inverter I. The value of this voltage is essentially determined by the resistor RE, the value of which is greater than the sum of all the resistors RM which are possible in a detection line. In the event of a line break, no current flows through this terminating resistor RE. An interference signal above 0 is emitted via the comparator U of the comparator chain Q and the evaluation N. If the signal line L is short-circuited, the line voltage will drop due to the then bridged resistor RE and possibly a part of the resistor RM. This causes the comparator K of the comparator chain Q to respond and an error message to be issued.
Beim Ansprechen eines Melders M treten annähernd die gleichen Verhältnisse wie bei einem Kurzschluß auf, jedoch ist die Linienspannung nur während einer Halbperiode des Inverters I abgesenkt. Während der folgenden Halbperiode ist der Zustand der Meldelinie wie im Normalbetrieb, da die in Serie zum Melder M geschlatete Diode D nur in einer Richtung leitend ist und somit nur in einer Halbperiode der geschlossene Kontakt S und damit einen Teil der Melder M und den Endwiderstand RE überbrückt.When a detector M responds, approximately the same conditions occur as in the event of a short circuit, but the line voltage is only reduced during a half period of the inverter I. During the following half-period, the status of the detection line is as in normal operation, since the diode D, which is connected in series with the detector M, is only conductive in one direction and thus only in one half-cycle the closed contact S and therefore bridges part of the detector M and the terminating resistor RE.
Die somit periodisch schwankende Linienspannung führt zum Ansprechen des Comparators A der Comparatorkette Q und gibt über die Auswertung N die Spannungsmessung G mit nachfolgender Meldeanzeige in H frei. Somit ist sichergestellt, daß ein Kurzschluß der Meldeleitung L - wie in den einschlägigen Vorschriften gefordert - nicht zu einer Alarmmeldung und damit zu einer Alarmauslösung führen kann. Außerden sind in den untereinander identischen Meldern nur zwei passive Bauelemente notwendig, um die geforderte Individualanzeige des betätigten Meldegebers zu signalisieren. Auch ist bei einer nachträglichen Änderung der Anzahl der Melder M in einer Meldelinie L keine Anpassung der Zentrale Z oder Manipulation an den Meldern M nötig.The line voltage, which fluctuates periodically, triggers the comparator A of the comparator chain Q and, via the evaluation N, releases the voltage measurement G with the subsequent message display in H. This ensures that a short circuit in the signal line L - as required by the relevant regulations - cannot lead to an alarm message and thus to an alarm being triggered. In addition, only two passive components are required in the mutually identical detectors in order to signal the required individual display of the actuated detector. Also, if the number of detectors M in a detection line L is subsequently changed, no adjustment of the central station Z or manipulation of the detectors M is necessary.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88109332T ATE96930T1 (en) | 1987-06-15 | 1988-06-11 | INDIVIDUAL IDENTIFICATION. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3719988 | 1987-06-15 | ||
| DE19873719988 DE3719988A1 (en) | 1987-06-15 | 1987-06-15 | INDIVIDUAL IDENTIFICATION |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0295593A2 true EP0295593A2 (en) | 1988-12-21 |
| EP0295593A3 EP0295593A3 (en) | 1989-08-30 |
| EP0295593B1 EP0295593B1 (en) | 1993-11-03 |
Family
ID=6329765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88109332A Expired - Lifetime EP0295593B1 (en) | 1987-06-15 | 1988-06-11 | Individual identification |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4833451A (en) |
| EP (1) | EP0295593B1 (en) |
| AT (1) | ATE96930T1 (en) |
| AU (1) | AU597203B2 (en) |
| DE (1) | DE3719988A1 (en) |
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| US11875667B2 (en) | 2021-04-05 | 2024-01-16 | Carrier Corporation | Fire system with current response calibration |
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| JPH0744937B2 (en) * | 1986-12-12 | 1995-05-17 | 而至歯科工業株式会社 | Composite crown for dental restoration |
| DE4030533A1 (en) * | 1990-09-27 | 1992-04-02 | Bosch Gmbh Robert | ARRANGEMENT FOR MONITORING A CONSUMER IN CONNECTION WITH AN INTERNAL COMBUSTION ENGINE OR. A MOTOR VEHICLE |
| DE4210848A1 (en) * | 1992-02-19 | 1993-08-26 | Beckhausen Karlheinz | Safety device, esp. for protecting people and objects from dangerous parameters - has comparator between measuring sensor and display, and displays at least two active states of comparison signal |
| US5512890A (en) * | 1992-02-19 | 1996-04-30 | Namco Controls Corporation | Sensor connection system |
| US5440293A (en) * | 1992-05-29 | 1995-08-08 | Pittway Corporation | Detector supervision apparatus and method |
| GB2312752A (en) * | 1996-05-01 | 1997-11-05 | Smiths Industries Plc | Aircraft temperature monitoring |
| GB9609046D0 (en) * | 1996-05-01 | 1996-07-03 | Smiths Industries Plc | Aircraft temperature monitoring |
| EP2804163B1 (en) * | 2013-05-17 | 2015-09-16 | Minimax GmbH & Co KG | Method and apparatus for detecting faults in control lines in hazard warning and control systems |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2154537A1 (en) * | 1970-11-12 | 1972-05-18 | Securitas Alarm Ab | Fire alarm system |
| DE2923899A1 (en) * | 1979-06-13 | 1980-12-18 | Merk Gmbh Telefonbau Fried | Switching arrangement for alarm circuit monitored by quiescent current - has terminal resistance at indicator circuits and polarised diodes w.r.t. supply current |
| DE2935335A1 (en) * | 1979-08-31 | 1981-03-19 | Siemens AG, 1000 Berlin und 8000 München | DC alarm signalling system - has two parallel lines connecting series of units, with terminal impedance and memory to record impedance at various times |
| DE3211550A1 (en) * | 1982-03-29 | 1983-10-13 | Siemens AG, 1000 Berlin und 8000 München | DC DETECTOR |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4435698A (en) * | 1980-06-11 | 1984-03-06 | Hekatron Gmbh | Circuit arrangement for the transmission of measurements to a central, especially in a fire alarm system |
| DE3127324A1 (en) * | 1981-07-10 | 1983-01-27 | Siemens AG, 1000 Berlin und 8000 München | METHOD AND ARRANGEMENT FOR INCREASING THE SENSITIVITY AND EMERGENCY SAFETY IN A DANGER, IN PARTICULAR FIRE DETECTING SYSTEM |
| US4567471A (en) * | 1983-08-08 | 1986-01-28 | Pittway Corporation | Monitoring system |
| US4549168A (en) * | 1983-10-06 | 1985-10-22 | Ryszard Sieradzki | Remote station monitoring system |
-
1987
- 1987-06-15 DE DE19873719988 patent/DE3719988A1/en active Granted
-
1988
- 1988-06-01 AU AU16939/88A patent/AU597203B2/en not_active Ceased
- 1988-06-11 AT AT88109332T patent/ATE96930T1/en not_active IP Right Cessation
- 1988-06-11 EP EP88109332A patent/EP0295593B1/en not_active Expired - Lifetime
- 1988-06-14 US US07/207,103 patent/US4833451A/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2154537A1 (en) * | 1970-11-12 | 1972-05-18 | Securitas Alarm Ab | Fire alarm system |
| DE2923899A1 (en) * | 1979-06-13 | 1980-12-18 | Merk Gmbh Telefonbau Fried | Switching arrangement for alarm circuit monitored by quiescent current - has terminal resistance at indicator circuits and polarised diodes w.r.t. supply current |
| DE2935335A1 (en) * | 1979-08-31 | 1981-03-19 | Siemens AG, 1000 Berlin und 8000 München | DC alarm signalling system - has two parallel lines connecting series of units, with terminal impedance and memory to record impedance at various times |
| DE3211550A1 (en) * | 1982-03-29 | 1983-10-13 | Siemens AG, 1000 Berlin und 8000 München | DC DETECTOR |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11875667B2 (en) | 2021-04-05 | 2024-01-16 | Carrier Corporation | Fire system with current response calibration |
Also Published As
| Publication number | Publication date |
|---|---|
| US4833451A (en) | 1989-05-23 |
| AU597203B2 (en) | 1990-05-24 |
| DE3719988C2 (en) | 1992-06-17 |
| AU1693988A (en) | 1988-12-15 |
| DE3719988A1 (en) | 1988-12-29 |
| EP0295593B1 (en) | 1993-11-03 |
| ATE96930T1 (en) | 1993-11-15 |
| EP0295593A3 (en) | 1989-08-30 |
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