EP0090399B1 - Direct current signalling installation - Google Patents
Direct current signalling installation Download PDFInfo
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- EP0090399B1 EP0090399B1 EP83103070A EP83103070A EP0090399B1 EP 0090399 B1 EP0090399 B1 EP 0090399B1 EP 83103070 A EP83103070 A EP 83103070A EP 83103070 A EP83103070 A EP 83103070A EP 0090399 B1 EP0090399 B1 EP 0090399B1
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- signalling
- line
- resistance value
- switch
- signalling line
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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
Definitions
- DC systems for fire protection, emergency calls or other hazard monitoring devices, such as intrusion protection, are widespread because they require little effort.
- detectors are connected in parallel to each detector line, which generally consists of a two-wire line and is also referred to as an alarm loop.
- the detection line has an end link, e.g. a resistance, completed.
- the connection resistor provides a quiescent current, via which the line is monitored.
- the alarm device changes its resistance and thus the total resistance of the line.
- the increasing or decreasing current is considered an alarm criterion. In the control center, however, it is generally not possible to determine which detector of the detector line has triggered the alarm in the known systems.
- a control device is also provided in the control center, which connects various direct voltages to the conductor loop in order to eliminate the pure line resistance in the respective detector by means of the voltage limiter circuit.
- Such a hazard alarm system has the disadvantage that the control center has a complex and complicated circuit arrangement, that different direct voltages have to be switched on or over to the conductor loop in order to determine the pure line resistance and to subtract it from the total resistance of the conductor loop.
- the individual detectors have a complicated circuit arrangement with a large number of components.
- DE-OS 2 611 145 describes an alarm system with a control device designed as a balanced bridge, which is equipped to protect a number of objects with the sensors associated with the objects, which are arranged with resistors in at least one current loop.
- a known detector circuit described there only has an alarm contact and, in series therewith, a resistor which is arranged in the conductor loop.
- several similar detectors can be arranged in series in the conductor loop.
- An additional detector or sensor is formed by a simple work contact, which is transverse to the conductor loop.
- a downstream control device can only detect a change in resistance and thus display an alarm.
- this arrangement has the disadvantage that the triggering detector cannot be recognized.
- DE-OS2939462 also discloses a method for identifying individual detectors in intrusion or fire detection systems, in which the respective lines are queried for their resistance value and compared with stored resistance setpoints for the individual detectors in the event of an alarm or sabotage. The response of the relevant detector is displayed.
- the disadvantage here is an elaborate circuit arrangement in the control center with several switch groups for switching the line voltage on and the comparison and logic elements.
- the individual detectors have a number of components which make the detector complex and cost-intensive.
- the object of the invention is to improve a direct current alarm system, in particular an intruder alarm system of the type described at the outset, in such a way that the measuring and evaluation device in the control center and the individual detectors are distinguished by a relatively simple circuit arrangement.
- the triggering detector should be able to be displayed directly.
- the detectors connected to the two-wire detection line only have a series resistor that is in series in the detection line and a detector switch that is connected directly between the two wires of the detection line and is closed in the event of an alarm.
- the detection line thus forms a conductor loop with fixed resistors connected in series.
- the respective detection line has a certain total resistance, which is essentially the sum of the connected detectors or their Resistors are formed.
- the response of a detector changes the total resistance of the detector line.
- the response of a specific detector results in a very specific change in resistance, because the specific detector short-circuits the detector line, so that only the detectors between the control center and the specific detector contribute to the current total resistance of the line, ie the detector line.
- the measuring and evaluation device arranged in the control center has a window discriminator assigned to each detector, at the reference input of which there is a reference voltage which corresponds to the measuring voltage of the resistance value of the detection line when the detector in question has been triggered.
- the individual window criminals form a number of voltage windows.
- a triggering detector with the characteristic resistance value of the detection line, causes a corresponding measurement voltage, which is fed to the respective measurement input of the window discriminators. As a result, the triggering of a particular detector is recognized and displayed because the output of each individual window discriminator leads to a respective display device.
- the hazard alarm system according to the invention does not require different DC voltages that have to be switched over or on. Likewise, no complex detectors are required. A large number of detectors of the same design, with only a few switching elements, are connected to one detector line. Eliminating the line resistance is not necessary.
- a further window discriminator can be provided, the reference voltage of which corresponds to a resistance value of the signal line that occurs when the line is disturbed, for example due to a line interruption or a short circuit in the signal line between the control center and the first detector.
- an alarm line is connected to the center Z.
- the individual detectors MI to Mn are connected to the detection line ML.
- the resistance R of the individual detector is connected in series in the detection line.
- the signaling switch S is shown here as a simple switching contact. It is arranged parallel to the detection line and open when it is quiet. In this case, the signaling switch is arranged from the control center Z in front of the signaling resistor R, so that the signaling line ends at the end with a short-circuit EG.
- FIG. 1 A modified detector circuit is shown in FIG.
- the ML detection line is connected to the control center.
- Several detectors MI to Mn are connected to the ML detection line.
- the detector resistor R is again connected in series to the detection line as in FIG. 1.
- the detector switch S is arranged after the detector resistor R parallel to the ML detector line.
- the detection line is terminated with a terminating resistor RL as the end element. If a detector responds, for example detector M2, the signaling switch S is closed. As a result, the detector line is short-circuited after detector resistance R of detector 2. The detectors behind it are therefore ineffective.
- the total resistance of the signaling line is changed suddenly, in this case reduced, and the instantaneous, according to the switching example, the total resistance of the signaling line formed by the detectors M1 and M2 is determined.
- the detector that has responded can be identified from this resistance value.
- FIG. 3 the central office Z is indicated, from which the reporting lines depart. Only one detection line ML is shown in FIG. 3.
- the alarm line monitoring is located in the control center and can be periodically connected to the respective alarm line, for example.
- a measuring device ME which determines the instantaneous resistance value of the detection line, is connected to the detection line ML.
- This measuring device ME is connected to an evaluation device AW, which in turn has a display downstream device ANZ on which the detector (eg M1) is displayed (LD1) that triggered the alarm.
- LD1 display downstream device ANZ on which the detector (eg M1) is displayed
- a fault for example if a short circuit or line break occurs on the line, is also indicated (LDS).
- a series of window discriminators are provided in the central measuring and evaluation device (ME, AW) according to the invention for evaluating the currently measured detection line measured values, as shown in FIG. 4.
- Each detector (Ml to Mn) is assigned a window discriminator DI to Dn.
- the voltage corresponding to the resistance value of the detection line ML is fed to the respective measurement input of the row of discriminators DO to Dn.
- the number of discriminators is one more than the corresponding number of detectors which are connected to a line ML.
- the response of the individual detector can be determined and displayed directly (ANZ MI to ANZ Mn).
- a line fault e.g. Line interruption or short circuit between the control center and the first detector shown in FIG. 2
- the individual detectors have a simple circuit arrangement, as shown in FIGS. 1 and 2.
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Abstract
Description
Die Erfindung betrifft eine Gleichstrommeldeanlage gemäss dem Oberbegriff des Patentanspruches 1.The invention relates to a direct current signaling system according to the preamble of patent claim 1.
Gleichstrommeldeanlagen für Brandschutz, Notruf oder andere Gefahrenüberwachungseinrichtungen, wie beispielsweise Intrusionsschutz, sind weit verbreitet, da sie nur einen geringen Aufwand erfordern. Dabei sind an jeder Meldelinie, die im allgemeinen aus einer Zwei-Draht-Leitung besteht und auch als Meldeschleife bezeichnet wird, jeweils mehrere Melder parallel angeschlossen. Die Meldelinie ist mit einem Endglied, z.B. einem Widerstand, abgeschlossen. Der Anschlusswiderstand sorgt für einen Ruhestrom, über den die Leitung überwacht wird. Im Alarmfall ändert der alarmgebende Melder seinen Widerstand und damit den Gesamtwiderstand der Leitung. Der sich erhöhende oder auch erniedrigende Strom gilt als Alarmkriterium. In der Zentrale ist jedoch bei den bekannten Anlagen im allgemeinen nicht feststellbar, welcher Melder der Melderlinie den Alarm ausgelöst hat.DC systems for fire protection, emergency calls or other hazard monitoring devices, such as intrusion protection, are widespread because they require little effort. Several detectors are connected in parallel to each detector line, which generally consists of a two-wire line and is also referred to as an alarm loop. The detection line has an end link, e.g. a resistance, completed. The connection resistor provides a quiescent current, via which the line is monitored. In the event of an alarm, the alarm device changes its resistance and thus the total resistance of the line. The increasing or decreasing current is considered an alarm criterion. In the control center, however, it is generally not possible to determine which detector of the detector line has triggered the alarm in the known systems.
Es sind Meldeanlagen bekannt, bei denen die einzelnen Melder einer Meldelinie identifizierbar sind. Allerdings ist dies nicht häufig bei Gleichstrommeldeanlagen üblich. Wenn dies der Fall ist, ist ein erheblich höherer Schaltungsaufwand für die Anlage und für die einzelnen Melder erforderlich.Alarm systems are known in which the individual detectors of an alarm line can be identified. However, this is not common in DC signaling systems. If this is the case, a considerably higher amount of circuitry is required for the system and for the individual detectors.
Beispielsweise ist in der DE-OS 2935335, die den Oberbegriff des Patentanspruchs 1 belegt, eine Gefahrenmeldeanlage beschrieben, in der eine Mehrzahl von Meldern über eine Leiterschleife an eine Zentrale angeschlossen ist. Jeder Melder weist einen Längs- und einen Querwiderstand, einen Alarmschalter und mehrere zur Leiterschleife quer liegende Dioden auf. So ist z.B. in jedem Melder eine Zenerdiode in Reihe zu einer einfachen Diode mit entgegengesetzter Polarität zur Zenerdiode angeordnet. Diese bilden eine Spannungsbegrenzerschaltung. Die Zentrale weist eine Messeinrichtung zur Ermittlung des Gesamtwiderstandes der Leiterschleife auf. Im Alarmfall ändert sich der Widerstand der Leiterschleife und wird mit gespeicherten Widerstands-Sollwerten für den Alarmfall verglichen. Daraus wird der alarmgebende Melder ermittelt. In der Zentrale ist ferner eine Steuervorrichtung vorgesehen, die verschiedene Gleichspannungen an die Leiterschleife anschaltet, um mittels der Spannungsbegrenzerschaltung im jeweiligen Melder den reinen Leitungswiderstand zu eliminieren. Eine derartige Gefahrenmeldeanlage hat den Nachteil, dass die Zentrale eine aufwendige und komplizierte Schaltungsanordnung aufweist, dass unterschiedliche Gleichspannungen an die Leiterschleife an- bzw. umgeschaltet werden müssen, um den reinen Leitungswiderstand zu ermitteln und vom Gesamtwiderstand der Leiterschleife zu subtrahieren. Ferner besitzen die einzelnen Melder eine komplizierte Schaltungsanordnung mit einer Vielzahl von Bauelementen.For example, DE-OS 2935335, which supports the preamble of claim 1, describes a hazard detection system in which a plurality of detectors are connected to a control center via a conductor loop. Each detector has a series and a transverse resistor, an alarm switch and several diodes lying across the conductor loop. For example, A Zener diode is arranged in series in each detector to form a simple diode with the opposite polarity to the Zener diode. These form a voltage limiter circuit. The control center has a measuring device for determining the total resistance of the conductor loop. In the event of an alarm, the resistance of the conductor loop changes and is compared with stored resistance setpoints for the alarm case. The alarming detector is determined from this. A control device is also provided in the control center, which connects various direct voltages to the conductor loop in order to eliminate the pure line resistance in the respective detector by means of the voltage limiter circuit. Such a hazard alarm system has the disadvantage that the control center has a complex and complicated circuit arrangement, that different direct voltages have to be switched on or over to the conductor loop in order to determine the pure line resistance and to subtract it from the total resistance of the conductor loop. Furthermore, the individual detectors have a complicated circuit arrangement with a large number of components.
In der DE-OS 2 611 145 ist eine Alarmanlage mit einer als abgeglichene Brücke ausgebildeter Kontrollvorrichtung beschrieben, die zur Absicherung einer Reihe von Objekten mit den Objekten zugeordneten Sensoren ausgerüstet ist, die mit Widerständen in mindestens einer Stromschleife angeordnet sind. Eine dort beschriebene bekannte Melderschaltung weist lediglich einen Alarmkontakt und in Reihe dazu einen Widerstand auf, der in der Leiterschleife angeordnet ist. Es können dort mehrere gleichartige Melder in Reihe in der Leiterschleife angeordnet sein. Ein zusätzlicher Melder bzw. Sensor ist durch einen einfachen Arbeitskontakt gebildet, der quer zur Leiterschleife liegt. Eine nachgeordnete Kontrollvorrichtung vermag lediglich eine Widerstandsänderung zu erkennen und somit einen Alarm anzuzeigen. Diese Anordnung hat jedoch den Nachteil, dass der auslösende Melder nicht erkannt werden kann. Ferner besteht grundsätzlich die Möglichkeit, die Schleife an einer vorher durch ein L-Glied überbrückten Stelle aufzutrennen und an der Trennstelle den bisher wirksamen Strom bzw. Widerstand aufrecht zu erhalten.DE-OS 2 611 145 describes an alarm system with a control device designed as a balanced bridge, which is equipped to protect a number of objects with the sensors associated with the objects, which are arranged with resistors in at least one current loop. A known detector circuit described there only has an alarm contact and, in series therewith, a resistor which is arranged in the conductor loop. There, several similar detectors can be arranged in series in the conductor loop. An additional detector or sensor is formed by a simple work contact, which is transverse to the conductor loop. A downstream control device can only detect a change in resistance and thus display an alarm. However, this arrangement has the disadvantage that the triggering detector cannot be recognized. Furthermore, there is basically the possibility of separating the loop at a point previously bridged by an L element and of maintaining the current or resistance which was previously effective at the separation point.
Es ist ferner aus der DE-OS2939462 ein Verfahren zur Identifizierung einzelner Melder in Einbruch- oder Brandmeldeanlagen bekannt, bei dem die jeweiligen Linien auf ihren Widerstandswert abgefragt und mit gespeicherten Widerstandssollwerten für die einzelnen Melderfür den Alarm- bzw. Sabotagefall verglichen werden. Das Ansprechen des betreffenden Melders wird angezeigt. Dort ist jedoch im Alarm- bzw. Sabotagefall oder bei einer Störung erforderlich, die von der Ruhespannung abweichenden Spannungen für die Abfrage auf Alarm und auf Sabotage an die Linie anzuschalten. Von Nachteil ist dabei eine aufwendige Schaltungsanordnung in der Zentrale mit mehreren Schaltergruppen zur An-und Umschaltung der Leitungsspannung und der Vergleichs- und Verknüpfungsglieder. Auch dort weisen die einzelnen Melder eine Reihe von Bauelementen auf, die den Melder aufwendig und kostenintensiv machen. Aufgabe der Erfindung ist es, eine Gleichstrommeldeanlage, insbesondere eine Einbruchmeldeanlage der eingangs beschriebenen Art, dahingehend zu verbessern, dass sich die Mess- und Auswerteeinrichtung in der Zentrale und die einzelnen Melder durch eine verhältnismässig einfache Schaltungsanordnung auszeichnen. Dabei soll der auslösende Melder direkt angezeigt werden können.DE-OS2939462 also discloses a method for identifying individual detectors in intrusion or fire detection systems, in which the respective lines are queried for their resistance value and compared with stored resistance setpoints for the individual detectors in the event of an alarm or sabotage. The response of the relevant detector is displayed. There, however, in the event of an alarm or sabotage or in the event of a fault, it is necessary to switch on the voltages deviating from the quiescent voltage for the query for alarm and sabotage on the line. The disadvantage here is an elaborate circuit arrangement in the control center with several switch groups for switching the line voltage on and the comparison and logic elements. Here too, the individual detectors have a number of components which make the detector complex and cost-intensive. The object of the invention is to improve a direct current alarm system, in particular an intruder alarm system of the type described at the outset, in such a way that the measuring and evaluation device in the control center and the individual detectors are distinguished by a relatively simple circuit arrangement. The triggering detector should be able to be displayed directly.
Erfindungsgemäss wird diese Aufgabe bei einer Anlage der eingangs genannten Art mit den Merkmalen des Anspruchs 1 gelöst.According to the invention, this object is achieved in a system of the type mentioned at the outset with the features of claim 1.
Die an die zweidrähtige Meldelinie angeschlossenen Melder weisen nur einen Serienwiderstand, der in Reihe in der Meldelinie liegt, und einen Melderschalter auf, der direkt zwischen den beiden Drähten der Meldelinie angeschlossen ist und im Alarmfall geschlossen wird. Somit bildet die Meldelinie eine Leiterschleife mit festen, in Reihe geschalteten Widerständen. Die jeweilige Meldelinie weist einen bestimmten Gesamtwiderstand auf, der im wesentlichen von der Summe der angeschalteten Melder bzw. deren Widerstände gebildet ist. Das Ansprechen eines Melders bewirkt eine Änderung des Gesamtwiderstandes der Meldelinie. Das Ansprechen eines bestimmten Melders ergibt eine ganz bestimmte Widerstandsänderung, denn der bestimmte Melder schliesst die Melderlinie kurz, so dass nur noch die Melder zwischen der Zentrale und dem bestimmten Melder zum momentanen Gesamtwiderstand der Leitung, d.h. der Meldelinie, beitragen. Die in der Zentrale angeordnete Mess- und Auswerteeinrichtung weist jedem Melder zugeordnet einen Fensterdiskriminator auf, an dessen Referenzeingang eine Vergleichsspannung anliegt, die der Messspannung des Widerstandswerts der Meldelinie entspricht, wenn der betreffende Melder ausgelöst wurde. Die einzelnen Fensterkriminatoren bilden eine Anzahl von Spannungsfenstern. Ein auslösender Melder bewirkt mit dem für ihn charakteristischen Widerstandswert der Meldelinie eine dementsprechende Messspannung, die dem jeweiligen Messeingang der Fensterdiskriminatoren zugeführt wird. Dadurch wird das Auslösen eines bestimmten Melders erkannt und angezeigt, weil der Ausgang jedes einzelnen Fensterdiskriminators auf eine jeweilige Anzeigeeinrichtung führt.The detectors connected to the two-wire detection line only have a series resistor that is in series in the detection line and a detector switch that is connected directly between the two wires of the detection line and is closed in the event of an alarm. The detection line thus forms a conductor loop with fixed resistors connected in series. The respective detection line has a certain total resistance, which is essentially the sum of the connected detectors or their Resistors are formed. The response of a detector changes the total resistance of the detector line. The response of a specific detector results in a very specific change in resistance, because the specific detector short-circuits the detector line, so that only the detectors between the control center and the specific detector contribute to the current total resistance of the line, ie the detector line. The measuring and evaluation device arranged in the control center has a window discriminator assigned to each detector, at the reference input of which there is a reference voltage which corresponds to the measuring voltage of the resistance value of the detection line when the detector in question has been triggered. The individual window criminals form a number of voltage windows. A triggering detector, with the characteristic resistance value of the detection line, causes a corresponding measurement voltage, which is fed to the respective measurement input of the window discriminators. As a result, the triggering of a particular detector is recognized and displayed because the output of each individual window discriminator leads to a respective display device.
Die erfindungsgemässe Gefahrenmeldeanlage erfordert keine unterschiedlichen Gleichspannungen, die um- bzw. angeschaltet werden müssen. Ebenso sind auch keine aufwendigen Melder erforderlich. Es ist eine Vielzahl von gleichartig aufgebauten, nur wenige Schaltelemente aufweisende Melder an einer Melderlinie angeschlossen. Ein Eliminieren des Leitungswiderstandes ist dabei nicht erforderlich.The hazard alarm system according to the invention does not require different DC voltages that have to be switched over or on. Likewise, no complex detectors are required. A large number of detectors of the same design, with only a few switching elements, are connected to one detector line. Eliminating the line resistance is not necessary.
Gerade bei Intrusionsmeldeanlagen, wo bis zu 20 Melder an eine Linie angeschlossen werden dürfen, lassen sich gemäss der Erfindung einfache, preisgünstige und zuverlässige Meldeanlagen aufbauen. Mit einer derartigen Mess- und Auswerteeinrichtung ist es bei bis zu 20 Meldern an einer Linie möglich, den Alarm auslösenden Melder zu identifizieren und in der Zentrale anzuzeigen. In einfacher Weise kann der Meldeschalter, der im einfachsten Fall ein Schliesskontakt sein kann, von der Zentrale aus gesehen, vor oder nach dem Widerstand des einzelnen Melders angeordnet sein. Ist er nach dem Melderwiderstand angeordnet, so ist als Endglied ein Abschlusswiderstand nach dem letzten Melder in der Meldelinie vorzusehen. Im anderen Fall ist die Meldelinie am Ende nur kurzzuschliessen, so dass ein zusätzlicher Abschlusswiderstand entfällt.Especially with intrusion detection systems, where up to 20 detectors can be connected to a line, simple, inexpensive and reliable detection systems can be constructed according to the invention. With such a measuring and evaluation device, it is possible with up to 20 detectors on one line to identify the detectors that trigger the alarm and display them in the control center. In a simple manner, the signaling switch, which in the simplest case can be a make contact, seen from the control center, can be arranged before or after the resistance of the individual detector. If it is arranged after the detector resistance, a terminating resistor must be provided as the end element after the last detector in the detection line. In the other case, the detection line must only be short-circuited at the end, so that an additional terminating resistor is not required.
Zweckmässigerweise können die einzelnen Melder gleiche Bauelemente, z.B. gleichwertige Widerstände aufweisen. Dadurch können sehr preiswerte Melder installiert werden, deren Anordnung in der Meldelinie beliebig sein kann, weil bei keinem Melder eine spezielle Codierung für eine Identifizierung erforderlich ist.The individual detectors can expediently have the same components, e.g. have equivalent resistances. This means that very inexpensive detectors can be installed, which can be arranged anywhere in the detection line, because no detector requires special coding for identification.
In vorteilhafter Weise kann noch ein weiterer Fensterdiskriminator vorgesehen sein, dessen Vergleichsspannung einem Widerstandswert der Meldeleitung entspricht, der auftritt, wenn die Leitung gestört ist, beispielsweise durch eine Leitungsunterbrechung oder einen Kurzschluss der Meldeleitung zwischen der Zentrale und dem ersten Melder.Advantageously, a further window discriminator can be provided, the reference voltage of which corresponds to a resistance value of the signal line that occurs when the line is disturbed, for example due to a line interruption or a short circuit in the signal line between the control center and the first detector.
Die Erfindung wird nachfolgend an einem Ausführungsbeispiel anhand der Zeichnung näher erläutert.The invention is explained in more detail using an exemplary embodiment with reference to the drawing.
Es zeigen
- Fig. 1 die Schaltung mehrerer Melder, die mit einer Meldelinie an einer Zentrale angeschlossen sind,
- Fig. eine Abwandlung der Melderschaltung gemäss Fig. 1,
- Fig.3 ein Prinzipschaltbild der Zentrale mit einer Mess- und Auswerteeinrichtung und
- Fig.4 ein Prinzipschaltbild für die erfindungsgemässe Mess- und Auswerteeinrichtung mit Fensterdiskriminatoren.
- 1 shows the circuitry of a plurality of detectors which are connected to an alarm line at a control center,
- 1 shows a modification of the detector circuit according to FIG. 1,
- 3 shows a block diagram of the control center with a measuring and evaluation device and
- 4 shows a basic circuit diagram for the measuring and evaluation device according to the invention with window discriminators.
In Fig. 1 ist an die Zentrale Z eine Meldelinie angeschlossen. An die Meldelinie ML sind die einzelnen Melder MI bis Mn angeschaltet. Dabei ist der Widerstand R des einzelnen Melders in Reihe in die Meldelinie geschaltet. Der Meldeschalter S ist hier als einfacher Schaltkontakt dargestellt. Es ist parallel zur Meldelinie angeordnet und bei Ruhe geöffnet. Der Meldeschalter ist von der Zentrale Z aus gesehen in diesem Fall vor dem Melderwiderstand R angeordnet, so dass die Meldeleitung am Ende mit einem Kurzschluss EG abgeschlossen ist.In Fig. 1, an alarm line is connected to the center Z. The individual detectors MI to Mn are connected to the detection line ML. The resistance R of the individual detector is connected in series in the detection line. The signaling switch S is shown here as a simple switching contact. It is arranged parallel to the detection line and open when it is quiet. In this case, the signaling switch is arranged from the control center Z in front of the signaling resistor R, so that the signaling line ends at the end with a short-circuit EG.
In Fig. ist eine abgewandelte Melderschaltung dargestellt. Die Meldelinie ML ist an der Zentrale angeschlossen. An die Meldelinie ML sind mehrere Melder MI bis Mn angeschlossen. Der Melderwiderstand R ist wieder wie in Fig. 1 in Reihe in die Meldelinie geschaltet. Der Melderschalter S hingegen ist nach dem Melderwiderstand R parallel zur Meldelinie ML angeordnet. Hierbei ist die Meldelinie mit einem Abschlusswiderstand RL als Endglied abgeschlossen. Spricht ein Melder, beispielsweise der Melder M2 an, so wird der Meldeschalter S geschlossen. Dadurch wird die Meldelinie nach dem Melderwiderstand R des Melders 2 kurzgeschlossen. Die dahinter befindlichen Melder sind damit wirkungslos. Dadurch wird der Gesamtwiderstand der Meldeleitung sprunghaft verändert, in diesem Fall verringert, und der augenblickliche, entsprechend dem Schaltbeispiel der durch die Melder M1 und M2 gebildete Gesamtwiderstand der Meldeleitung ermittelt. Aus diesem Widerstandswert lässt sich der Melder identifizieren, der angesprochen hat.A modified detector circuit is shown in FIG. The ML detection line is connected to the control center. Several detectors MI to Mn are connected to the ML detection line. The detector resistor R is again connected in series to the detection line as in FIG. 1. The detector switch S, however, is arranged after the detector resistor R parallel to the ML detector line. Here, the detection line is terminated with a terminating resistor RL as the end element. If a detector responds, for example detector M2, the signaling switch S is closed. As a result, the detector line is short-circuited after detector resistance R of detector 2. The detectors behind it are therefore ineffective. As a result, the total resistance of the signaling line is changed suddenly, in this case reduced, and the instantaneous, according to the switching example, the total resistance of the signaling line formed by the detectors M1 and M2 is determined. The detector that has responded can be identified from this resistance value.
In Fig. 3 ist die Zentrale Z angedeutet, von der die Meldelinien abgehen. In der Fig. 3 ist nur eine Meldelinie ML dargestellt. In der Zentrale befindet sich die Meldelinienüberwachung, die beispielsweise periodisch an die jeweilige Meldelinie angeschaltet werden kann. An der Meldelinie ML ist eine Messeinrichtung ME, die den augenblicklichen Widerstandswert der Meldelinie ermittelt, angeschlossen. Diese Messeinrichtung ME ist mit einer Auswerteeinrichtung AW verbunden, die ihrerseits nachgeordnet eine Anzeigeeinrichtung ANZ aufweist, an der der Melder (z.B. M1) angezeigt (LD1) wird, der den Alarm ausgelöst hat. Eine Störung, z.B. wenn auf der Leitung ein Kurzschluss oder eine Leitungsunterbrechung auftritt, wird ebenfalls angezeigt (LDS).In Fig. 3, the central office Z is indicated, from which the reporting lines depart. Only one detection line ML is shown in FIG. 3. The alarm line monitoring is located in the control center and can be periodically connected to the respective alarm line, for example. A measuring device ME, which determines the instantaneous resistance value of the detection line, is connected to the detection line ML. This measuring device ME is connected to an evaluation device AW, which in turn has a display downstream device ANZ on which the detector (eg M1) is displayed (LD1) that triggered the alarm. A fault, for example if a short circuit or line break occurs on the line, is also indicated (LDS).
Zur Auswertung der augenblicklich gemessenen Meldelinien-Messwerte sind in der zentralen Mess- und Auswerteeinrichtung (ME, AW) erfindungsgemäss eine Reihe von Fensterdiskriminatoren (DO bis Dn) vorgesehen, wie in Fig. 4 gezeigt. Dabei ist jedem Melder (Ml bis Mn) ein Fensterdiskriminator DI bis Dn zugeordnet. Die dem Widerstandswert der Meldelinie ML entsprechende Spannung ist auf den jeweiligen Messeingang der Reihe der Diskriminatoren DO bis Dn geführt. Die Anzahl der Diskriminatoren ist in diesem Ausführungsbeispiel um eins höher als die entsprechende Anzahl der Melder, die an einer Linie ML angeschlossen sind. Mit Hilfe dieser Kette aus an sich bekannten Fensterdiskriminatoren kann das Ansprechen des einzelnen Melders ermittelt und direkt angezeigt (ANZ MI bis ANZ Mn) werden. Mit dem zusätzlichen Fensterdiskriminator DO wird eine Leitungsstörung, z.B. Leitungsunterbrechung oder Kurzschluss zwischen Zentrale und dem ersten Melder gemäss Fig. 2 angezeigt, dabei weisen die einzelnen Melder eine einfache Schaltungsanordnung, wie in Fig. 1 und 2 dargestellt, auf.A series of window discriminators (DO to Dn) are provided in the central measuring and evaluation device (ME, AW) according to the invention for evaluating the currently measured detection line measured values, as shown in FIG. 4. Each detector (Ml to Mn) is assigned a window discriminator DI to Dn. The voltage corresponding to the resistance value of the detection line ML is fed to the respective measurement input of the row of discriminators DO to Dn. In this exemplary embodiment, the number of discriminators is one more than the corresponding number of detectors which are connected to a line ML. With the help of this chain of known window discriminators, the response of the individual detector can be determined and displayed directly (ANZ MI to ANZ Mn). With the additional window discriminator DO, a line fault, e.g. Line interruption or short circuit between the control center and the first detector shown in FIG. 2, the individual detectors have a simple circuit arrangement, as shown in FIGS. 1 and 2.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT83103070T ATE23759T1 (en) | 1982-03-29 | 1983-03-28 | DIRECT CURRENT DETECTION SYSTEM. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3211550A DE3211550C2 (en) | 1982-03-29 | 1982-03-29 | DC alarm system |
| DE3211550 | 1982-03-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0090399A1 EP0090399A1 (en) | 1983-10-05 |
| EP0090399B1 true EP0090399B1 (en) | 1986-11-20 |
Family
ID=6159615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83103070A Expired EP0090399B1 (en) | 1982-03-29 | 1983-03-28 | Direct current signalling installation |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0090399B1 (en) |
| AT (1) | ATE23759T1 (en) |
| DE (1) | DE3211550C2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6292720A (en) * | 1985-10-16 | 1987-04-28 | 住友電気工業株式会社 | Abnormal overheat detector of bus-duct joint part |
| DE3620681A1 (en) * | 1986-06-20 | 1987-12-23 | Merk Gmbh Telefonbau Fried | Circuit arrangement for identifying alarm signalling units |
| DE3719988A1 (en) * | 1987-06-15 | 1988-12-29 | Total Feuerschutz Gmbh | INDIVIDUAL IDENTIFICATION |
| GB8825907D0 (en) * | 1988-11-04 | 1988-12-07 | Process Computing Ltd | Signalling system |
| GB2312752A (en) * | 1996-05-01 | 1997-11-05 | Smiths Industries Plc | Aircraft temperature monitoring |
| US5831546A (en) * | 1996-05-10 | 1998-11-03 | General Signal Corporation | Automatic addressing in life safety system |
| DE19940700C2 (en) * | 1999-08-27 | 2003-05-08 | Job Lizenz Gmbh & Co Kg | Method and device for the automatic assignment of detector addresses in a hazard detection system |
| DE10310250A1 (en) * | 2003-03-04 | 2004-11-25 | Valeo Schalter Und Sensoren Gmbh | Electronic device identification method |
| US7999668B2 (en) | 2008-11-17 | 2011-08-16 | GM Global Technology Operations LLC | Series interlock system with integrated ability to identify breached locations |
| EP2757383A4 (en) * | 2011-09-22 | 2015-10-14 | Zte Corp | Rectifier identification method and device |
| CN103489277B (en) * | 2013-09-26 | 2015-08-26 | 胡亨华 | The fire early-warning system of on-line monitoring electric wiring resistance parameter |
| WO2015137896A1 (en) * | 2014-03-10 | 2015-09-17 | Kocsistem Bilgi Ve Iletisim Hizmetleri Anonim Sirketi | Data transmission method over sensor networks using controlled load consumption |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH586439A5 (en) * | 1975-06-03 | 1977-03-31 | Bbc Brown Boveri & Cie | |
| DE2611145A1 (en) * | 1976-03-17 | 1977-09-22 | Grothe & Soehne Kg A | Vibration operated burglar alarm - protects many separated objects by monitoring current through line connecting vibration prone contacts |
| US4152696A (en) * | 1977-11-16 | 1979-05-01 | Lectrolarm Custom Systems, Inc. | Multi-function control circuit |
| DE2907749C2 (en) * | 1979-02-28 | 1985-04-25 | MTU Motoren- und Turbinen-Union München GmbH, 8000 München | Device for minimizing constant maintenance of the blade tip clearance that exists in axial turbines of gas turbine engines |
| DE2935335C2 (en) * | 1979-08-31 | 1985-08-08 | Siemens AG, 1000 Berlin und 8000 München | DC alarm system |
| DE2939462C2 (en) * | 1979-09-28 | 1983-01-05 | Siemens AG, 1000 Berlin und 8000 München | Process and device for the identification of individual detectors in intrusion or fire alarm systems |
| DE2939494B2 (en) * | 1979-09-28 | 1981-07-02 | Siemens AG, 1000 Berlin und 8000 München | Circuit arrangement for intrusion or fire alarm systems |
-
1982
- 1982-03-29 DE DE3211550A patent/DE3211550C2/en not_active Expired
-
1983
- 1983-03-28 AT AT83103070T patent/ATE23759T1/en not_active IP Right Cessation
- 1983-03-28 EP EP83103070A patent/EP0090399B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0090399A1 (en) | 1983-10-05 |
| DE3211550A1 (en) | 1983-10-13 |
| DE3211550C2 (en) | 1985-02-14 |
| ATE23759T1 (en) | 1986-12-15 |
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