EP0026461A2 - Circuit arrangement for intrusion or fire alarm systems - Google Patents
Circuit arrangement for intrusion or fire alarm systems Download PDFInfo
- Publication number
- EP0026461A2 EP0026461A2 EP80105763A EP80105763A EP0026461A2 EP 0026461 A2 EP0026461 A2 EP 0026461A2 EP 80105763 A EP80105763 A EP 80105763A EP 80105763 A EP80105763 A EP 80105763A EP 0026461 A2 EP0026461 A2 EP 0026461A2
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- European Patent Office
- Prior art keywords
- alarm
- sabotage
- line
- detectors
- contact
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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
- G08B29/08—Signalling of tampering with the line circuit
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
Definitions
- the invention relates to an intrusion, hold-up and / or fire alarm system.
- Such alarm systems have so-called sabotage detectors in addition to the actual alarm detectors.
- the sabotage detectors protect the alarm detector against manipulation.
- the alarm detectors also have an additional contact that can be opened if the detector is opened without authorization, e.g. Removal of the housing cover, a so-called sabotage contact actuated.
- the alarm detectors should be able to be armed or disarmed independently of the sabotage detectors.
- alarm detectors and sabotage detectors are connected to the evaluating center via two different lines, generally two-wire lines. This means that the lines can be switched separately, but the number of lines required is twice as high as the number of alarm reporting lines.
- a fire alarm system is known in which the line in the control center is monitored for alarm, short circuit, interruption and earth fault with a voltage measuring device arranged in a voltage divider circuit. How the evaluation should be carried out in detail is not described in detail.
- the detectors can be connected in parallel to or in series in the line. In addition to the malfunctions mentioned above, it is only monitored for an alarm, for example in the event of a fire. Monitoring for sabotage is not possible there.
- the object of the invention is to provide a signaling system of the type mentioned in the introduction in which only one line, generally a two-wire line, is required for both the alarm and the sabotage message. Appropriate training of the detectors and a suitable evaluation facility at the headquarters are necessary for this.
- This object is achieved in that several alarm and sabotage detectors are connected to the same line, that an evaluation device is provided in a control center, by means of which alarm and sabotage messages can be evaluated independently of one another, with a current measuring device for determining the line resistance in the line is arranged, the output of which is connected to a plurality of comparators, and which receive different current limit values predefined in accordance with the number of comparators as comparison variables, so that a separate alarm and sabotage message can be displayed above the comparators logic logic elements.
- An advantage of the circuit arrangement according to the invention is that only half of the lines are necessary for the required signaling lines to the control center.
- the evaluation device located in the control center monitors the current applied to the line by a voltage source.
- the current flowing in the line and thus the resistance of the line is measured on a current measuring device arranged in the line and is passed to several comparators which are arranged downstream of the current measuring device. These receive predetermined different current limit values which correspond to the resistance limit values of the line at rest.
- alarm or sabotage messages are displayed by logical combinations of the output signals of the comparators.
- the alarm message can expediently be switched off without influencing the sabotage message, so that tampering with the detectors or the lines can also be detected when the alarm sensors are disarmed.
- Another advantage of the arrangement according to the invention is that it can be easily integrated into a microcomputer-controlled control center, with all line current values for the most varied conditions on the line being measured after the system is switched on and stored in a read-write memory. These values then serve as comparison values for the different notification types.
- the present invention advantageously differs in that only one resistor is arranged in the detectors next to the alarm contact and no rectifier element is provided.
- the simultaneous monitoring for sabotage with the same line of alarm detectors requires the arrangement of an additional contact and an additional resistor.
- the figure shows the Ausvrerteeinrichttmg in the control center Z and a line L1 with a detector M1 and a line termination RLA.
- a voltage source P supplies the line L1 with the voltage U.
- a plurality of detectors M1, M2 ?? are connected in series, only one of which is shown.
- Line L1 is terminated with resistor RLA.
- the current I flowing on the line L1 is determined by the resistors RA, RS of the detectors M, the line termination RLA and the resistance of the line.
- a current measuring device MI is connected in series in the line, the resistance value of which is chosen so small that it practically does not influence the line current 1.
- the line current I is a measure of the total resistance of the detection line L1.
- the value of the measured line current I is passed from the output of the measuring device MI to the first inputs of three comparators K1, K2, K3.
- the comparators are known comparison elements, for example BE TCA 345A (Siemens), which compare a continuously variable variable with a second variable, the reference variable. As long as the constantly variable variable is larger than the comparison value, the output has a level which corresponds, for example, to logic "0", in the other case to logic "1".
- the predetermined current limit values are applied to the second inputs of the three comparators, for example a minimally permissible current value Imin at the comparator K1 and the current value I 0 at the comparator K2 equals zero and a maximum permissible current value Imax at comparator K3.
- the output of the comparator K1 goes to a first input of an AND gate G1, the output of the comparator K 2 goes on the one hand via a negation element G2 to the second input of the AND gate G1 and on the other hand to a first input of an OR gate G3.
- the output of the comparator K3 leads to the second input of the OR gate G3. If a detector M responds or there is another fault, the output signal of the OR gate G3 shows a sabotage message "S", the output signal of the AND gate G1 an alarm message "A". With the switch SA connected downstream of the AND gate G1, the alarm detectors can be disarmed.
- the M detectors are connected in series to the L line. Each detector has a KS sabotage contact and a RS resistor in series. Parallel to this "sabotage" resistor RS there is also a series connection of the alarm contact K1 and the "alarm" resistor RA.
- the resistance values are selected in such a way that the response of several alarm detectors cannot simulate a sabotage message.
- the first case is indicated via the output of the comparator K2
- the second and third case is indicated via the comparator K3 and the OR gate G3 connected downstream of the two comparators K2 and K3 as sabotage message "S”.
- An alarm message is only given if the line current I is less than the lower limit of the line current Imin but is not equal to zero.
- the alarm message "A" is displayed via the outputs of the comparators K1 and K2 and the logic elements G1 and G2.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Alarm Systems (AREA)
- Fire Alarms (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
Description
Die Erfindung betrifft eine Einbruch-, Überfall- und/oder Feuermeldeanlage. Solche Meldeanlagen besitzen neben den eigentlichen Alarmmeldern noch sogenannte Sabotagemelder. Die Sabotagemelder schützen den Alarmmelder vor Manipulationen. Die Alarmmelder weisen neben dem eigentlichen Alarmkontakt noch einen zusätzlichen Kontakt auf, der bei unerlaubtem Öffnen des Melders, z.B. Abnahme des Gehäusedeckels, einen sog. Sabotagekontakt betätigt. Die Alarmmelder sollen unabhängig von den Sabotagemeldern scharf- bzw. unscharf geschaltet werden können. In herkömmlichen Systemen werden Alarmmelder und Sabotagemelder über zwei verschiedene Linien, im allgemeinen Zweidrahtleitungen, an die auswertende Zentrale angeschlossen. Damit sind die Linien zwar getrennt schaltbar, aber die Anzahl der erforderlichen Linien ist doppelt so hoch als die Anzahl der Alarmmeldelinien.The invention relates to an intrusion, hold-up and / or fire alarm system. Such alarm systems have so-called sabotage detectors in addition to the actual alarm detectors. The sabotage detectors protect the alarm detector against manipulation. In addition to the actual alarm contact, the alarm detectors also have an additional contact that can be opened if the detector is opened without authorization, e.g. Removal of the housing cover, a so-called sabotage contact actuated. The alarm detectors should be able to be armed or disarmed independently of the sabotage detectors. In conventional systems, alarm detectors and sabotage detectors are connected to the evaluating center via two different lines, generally two-wire lines. This means that the lines can be switched separately, but the number of lines required is twice as high as the number of alarm reporting lines.
Aus der DE-OS 21 54 537 ist eine Feuermeldeanlage bekannt, in der in der Zentrale die Linie mit einer in einer Spannungsteilerschaltung angeordneten Spannungsmeßvorrichtung auf Alarm, Kurzschluß, Unterbrechung und Erdschluß überwacht wird. Wie die Auswertung im einzelnen erfolgen soll, ist nicht näher beschrieben. Dabei können die Melder parallel zur oder in Serie in die Linie geschaltet sein. Es wird neben den obengenannten Störungsfällen nur auf Alarm, beispielsweise im Brandfall, überwacht. Eine Überwachung auf Sabotage ist dort nicht möglich.From DE-OS 21 54 537 a fire alarm system is known in which the line in the control center is monitored for alarm, short circuit, interruption and earth fault with a voltage measuring device arranged in a voltage divider circuit. How the evaluation should be carried out in detail is not described in detail. The detectors can be connected in parallel to or in series in the line. In addition to the malfunctions mentioned above, it is only monitored for an alarm, for example in the event of a fire. Monitoring for sabotage is not possible there.
Aufgabe der Erfindung ist es, eine Meldeanlage-der eingangs erwähnten Art zu schaffen, in der sowohl für die Alarm-, als auch die Sabotagemeldung nur eine Linie, im allgemeinen eine Zweidrahtleitung, erforderlich ist. Dafür ist eine entsprechende Ausbildung der Melder und eine geeignete Answerteeinrichtnng in der Zentrale notwendig.The object of the invention is to provide a signaling system of the type mentioned in the introduction in which only one line, generally a two-wire line, is required for both the alarm and the sabotage message. Appropriate training of the detectors and a suitable evaluation facility at the headquarters are necessary for this.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß mehrere Alarm- und Sabotagemelder an ein- und derselben Linie angeschlossen sind, daß in einer Zentrale eine Auswerteeinrichtung vorgesehen ist, durch die unabhängig voneinander Alarm- und Sabotagemeldungen auswertbar sind, wobei in der Linie eine Strommeßeinrichtung zur Linienwiderstandsermittlung angeordnet ist, deren Ausgang mit einer Mehrzahl von Komparatoren verbunden ist, und die entsprechend der Anzahl der Komparatoren vorherbestimmte, unterschiedliche Stromgrenzwerte als Vergleichsgrößen erhalten, so daß über den Komparatoren nachgeordneten logischen Verknüpfungsgliedern eine getrennte Alarm- und Sabotagemeldung anzeigbar ist.This object is achieved in that several alarm and sabotage detectors are connected to the same line, that an evaluation device is provided in a control center, by means of which alarm and sabotage messages can be evaluated independently of one another, with a current measuring device for determining the line resistance in the line is arranged, the output of which is connected to a plurality of comparators, and which receive different current limit values predefined in accordance with the number of comparators as comparison variables, so that a separate alarm and sabotage message can be displayed above the comparators logic logic elements.
Ein Vorteil der erfindungsgemäßen Schaltungsanordnung besteht darin, daß nur noch die Hälfte der Leitungen für die erforderlichen Meldelinien zur Zentrale notwendig sind. Die in der Zentrale befindliche Auswerteeinrichtung überwacht den von einer Spannungsquelle an die Linie gelegten Strom. An einer in der Linie angeordneten Strommeßeinrichtung wird darauf der Linie fließende Strom und damit der Widerstand der Linie gemessen und an mehrere Komparatoren, die der Strommeßeinrichtung nachgeordnet sind, gegeben. Diese erhalten vorherbestimmte unterschiedliche Stromgrenzwerte, die den Widerstandsgrenzwerten der Linie bei Ruhe entsprechen. Aufgrund der Vergleiche der Linienmeßwerte mit den vorgegebenen Grenzwerten werden durch logische Verknüpfungen der Ausgangssignale der Komparatoren Alarm- oder Sabotagemeldungen angezeigt.An advantage of the circuit arrangement according to the invention is that only half of the lines are necessary for the required signaling lines to the control center. The evaluation device located in the control center monitors the current applied to the line by a voltage source. The current flowing in the line and thus the resistance of the line is measured on a current measuring device arranged in the line and is passed to several comparators which are arranged downstream of the current measuring device. These receive predetermined different current limit values which correspond to the resistance limit values of the line at rest. On the basis of the comparisons of the line measured values with the specified limit values, alarm or sabotage messages are displayed by logical combinations of the output signals of the comparators.
Zweckmäßigerweise ist die Alarmmeldung abschaltbar, ohne dabei die Sabotagemeldung zu beeinflussen, so daß eine Manipulation an den Meldern oder den Leitungen auch erkannt werden kann, wenn die Alarmmelder unscharf geschaltet sind.The alarm message can expediently be switched off without influencing the sabotage message, so that tampering with the detectors or the lines can also be detected when the alarm sensors are disarmed.
Ein weiterer Vorteil der erfindungsgemäßen Anordnung ist dadurch gegeben, daß sie sich in eine mikrovomputergesteuerte Zentrale gut integrieren läßt, wobei sämtliche Linienstromwerte für die unterschiedlichsten Bedingungen auf der Linie nach dem Einschalten der Anlage gemessen und in einem Schreib-Lese-Speicher abgespeichert werden. Diese Werte dienen dann als Vergleichswerte für die unterschiedlichen Meldungsarten.Another advantage of the arrangement according to the invention is that it can be easily integrated into a microcomputer-controlled control center, with all line current values for the most varied conditions on the line being measured after the system is switched on and stored in a read-write memory. These values then serve as comparison values for the different notification types.
Gegenüber der eingangs erwähnten bekannten Anordnung unterscheidet sich die vorliegende Erfindung in vorteilhafter Weise dadurch, daß in den Meldern neben dem Alarmkontakt nur ein Widerstand angeordnet und kein Gleichrichterelement vorgesehen ist. Die gleichzeitige Überwachung auf Sabotage mit derselben Linie der Alarmmelder bedingt die Anordnung eines weiteren Kontaktes und eines weiteren Widerstandes.Compared to the known arrangement mentioned at the outset, the present invention advantageously differs in that only one resistor is arranged in the detectors next to the alarm contact and no rectifier element is provided. The simultaneous monitoring for sabotage with the same line of alarm detectors requires the arrangement of an additional contact and an additional resistor.
Nachfolgend wird anhand der einzigen Zeichnung ein Ausführ ungsbeispiel der Erfindung beschrieben.An exemplary embodiment of the invention is described below with reference to the single drawing.
In der Figur ist die Ausvrerteeinrichttmg in der Zentrale Z und eine Linie L1 mit einem Melder M1 und einem Leitungsabschluß RLA dargestellt. Eine Spannungsquelle P versorgt die Linie L1 mit der Spannung U. In der Linie L1 sind mehrere Melder M1, M2...... in Serie geschaltet, von denen nur einer dargestellt ist. Die Linie L1 ist mit dem Widerstand RLA abgeschlossen. Der auf der Linie L1 fließende Strom I wird durch die Widerstände RA, RS der Melder M, dem Leitungsabschluß RLA und dem Widerstand der Leitung bestimmt. In der Zentrale Z ist in der Linie eine Strommeßeinrichtung MI in Reihe geschaltet, deren Widerstandswert so klein gewählt ist, daß er den Linienstrom 1 praktisch nicht beeinflußt. Der Linienstrom I ist ein Maß für den Gesamtwiderstand der Meldelinie L1.The figure shows the Ausvrerteeinrichttmg in the control center Z and a line L1 with a detector M1 and a line termination RLA. A voltage source P supplies the line L1 with the voltage U. In the line L1, a plurality of detectors M1, M2 ...... are connected in series, only one of which is shown. Line L1 is terminated with resistor RLA. The current I flowing on the line L1 is determined by the resistors RA, RS of the detectors M, the line termination RLA and the resistance of the line. In the control center Z, a current measuring device MI is connected in series in the line, the resistance value of which is chosen so small that it practically does not influence the
Vom Ausgang der Meßeinrichtung MI wird der Wert des gemessenen Linienstromes I an die ersten Eingänge dreier Komparatoren.K1, K2, K3 geführt. Die Komparatoren sind an sich bekannte Vergleichsglieder , Z.B. BE TCA 345A (Siemens), die eine stetig veränderliche Größe mit einer zweiten Größe, der Reverenzgröße vergleichen. Solange die-stetig veränderliche Größe größer ist als der Vergleichswert, führt der Ausgang einen Pegel, der z.B. der logischen "0", im anderen Fall der logischen "1" entspricht. An die zweiten Eingänge der drei Komparatoren liegen die vorgegebenen Stromgrenzwerte, z.B. am Komparator K1 ein minimal zulässiger Stromwert Imin, am Komparator K2 der Stromwert I0 gleich Null und am Komparator K3 ein maximal zulässiger Stromwert Imax. Der Ausgang des Komparators K1 geht an einen ersten Eingang eines UND-Gliedes G1, der Ausgang des Komparators K2 geht einerseits über ein Negationsglied G2 an den zweiten Eingang des UND-Gliedes G1 und andererseits an einen ersten Eingang eines ODER-Gliedes G3. Der Ausgang des Komparators K3 führt zum zweiten Eingang des ODER-Gliedes G3. Wenn ein Melder M anspricht oder eine sonstige Störung vorliegt, zeigt das Ausgangssignal des ODER-Gliedes G3 eine Sabotagemeldung "S", das Ausgangssignal des UND-Gliedes G1 eine Alarmmeldung "A" an. Mit dem dem UND-Glied G1 nachgeschalteten Schalter SA können die Alarmmelder unscharf geschaltet werden.The value of the measured line current I is passed from the output of the measuring device MI to the first inputs of three comparators K1, K2, K3. The comparators are known comparison elements, for example BE TCA 345A (Siemens), which compare a continuously variable variable with a second variable, the reference variable. As long as the constantly variable variable is larger than the comparison value, the output has a level which corresponds, for example, to logic "0", in the other case to logic "1". The predetermined current limit values are applied to the second inputs of the three comparators, for example a minimally permissible current value Imin at the comparator K1 and the current value I 0 at the comparator K2 equals zero and a maximum permissible current value Imax at comparator K3. The output of the comparator K1 goes to a first input of an AND gate G1, the output of the comparator K 2 goes on the one hand via a negation element G2 to the second input of the AND gate G1 and on the other hand to a first input of an OR gate G3. The output of the comparator K3 leads to the second input of the OR gate G3. If a detector M responds or there is another fault, the output signal of the OR gate G3 shows a sabotage message "S", the output signal of the AND gate G1 an alarm message "A". With the switch SA connected downstream of the AND gate G1, the alarm detectors can be disarmed.
Die Melder M sind in Serie zur Linie L geschaltet. Jeder Melder besitzt einen Sabotagekqntakt KS und in Serie dazu einen Widerstand RS. Parallel zu diesem "Sabotage"-Vider- stand RS liegt zusätzlich eine Reihenschaltung aus dem Alarmkontakt K1 und dem "Alarm"-Widerstand RA. Die Widerstandswerte sind so gewählt, daß das Ansprechen mehrerer Alarmmelder keine Sabotagemeldung vortäuschen kann.The M detectors are connected in series to the L line. Each detector has a KS sabotage contact and a RS resistor in series. Parallel to this "sabotage" resistor RS there is also a series connection of the alarm contact K1 and the "alarm" resistor RA. The resistance values are selected in such a way that the response of several alarm detectors cannot simulate a sabotage message.
Die Schaltungsanordnung funktioniert folgendermaßen:
- Der in der Strommeßeinrichtung MI in der Zentrale gemessene Linienstrom I wird dem Komparator K1, K2, K3 zugeführt. Im Normalfall, d.h. es liegt keine Alarm- und Sabotagemeldung oder sonstige Störungsmeldung vor, hat die Linien einen bestimmten Ruhestromwert. Die drei Komparatoren prüfen nun den Ruhestromwert. Der Komparator K1 vergleicht den Linienstrom I mit dem unteren Toleranzwert des Ruhestroms Imin. Der Komparator K2 prüft, ob der Ruhestrom gegen Null geht (I,=0). Der Komparator K3 vergleicht den Linienstrom I mit der oberen Toleranzgrenze des Ruhestroms Imax. Bei Abweichungen werden die Ausgänge der Komparatoren K1, K2, K3 aktiviert und eine Meldung angezeigt.
- The line current I measured in the current measuring device MI in the center is fed to the comparator K1, K2, K3. In the normal case, ie there is no alarm and sabotage message or other fault message, the lines have a certain quiescent current value. The three comparators now check the quiescent current value. The comparator K1 compares the line current I with the lower tolerance value of the quiescent current Imin. The comparator K2 checks whether the quiescent current approaches zero (I, = 0). The comparator K3 compares the line current I with the upper tolerance limit of the quiescent current Imax. In the event of deviations, the outputs of the comparators K1, K2, K3 are activated and a message is displayed.
Eine Sabotagemeldung liegt vor, wenn entweder der Sabotagekontakt KS geöffnet ist und somit I=0 wird, oder die Leitung der Meldelinie kurz geschlossen oder ein Melder überbrückt wird. Das bedeutet, der Linienstrom I wird größer als der maximal zulässige Ruhestrom Imax. Der erste Fall wird über den Ausgang des Komparators K2, der zweite und dritte Fall wird über den Komparator K3 und den den beiden Komparatoren K2 und K3 nachgeschalteten ODER-Glied G3 als Sabotagemeldung "S" angezeigt. Eine Alarmmeldung liegt nur vor, wenn der Linienstrnm I kleiner als der untere Grenzwert des Linienstromes Imin ist aber ungleich Null wird. Die Alarmmeldung "A" wird überdLe Ausgänge der Komparatoren K1 und K2 und en Verknüpfungsgliedern G1 und G2 angezeigt.A sabotage signal is given if either the sabotage contact KS is open and thus becomes I = 0, or the line of the detection line is briefly closed or a detector is bridged. This means that the line current I becomes greater than the maximum permissible quiescent current Imax. The first case is indicated via the output of the comparator K2, the second and third case is indicated via the comparator K3 and the OR gate G3 connected downstream of the two comparators K2 and K3 as sabotage message "S". An alarm message is only given if the line current I is less than the lower limit of the line current Imin but is not equal to zero. The alarm message "A" is displayed via the outputs of the comparators K1 and K2 and the logic elements G1 and G2.
Claims (4)
dadurch gekennzeichnet, daß mehrere Alarm- und Sabotagemelder (M1,M2....) an ein- und derselben Linie (L1) angeschlossen sind, daß in einer Zentrale (Z) eine Auswerteeinrichtung vorgesehen ist, durch die unabhängig voneinander Alarm- und Sabotagemeldungen auswertbar sind, wobei in der Linie eine Strom-Meßinrishtung (MI) zur Linienwiderstandsermittlung angeordnet ist, deren Ausgang-mit einer Mehrzahl von Komparatoren (K1,E2,K3) verbunden ist, und· die entsprechend der Anzahl der komparatoren (K1,K2,K3) vorherbestimmte, unterschiedliche Widerstands- bzw. Stromgrenzwerte (Imin,I0,Imax) als Vergleichsgrößen erhalten, so daß über den Komparatoren (K1,K2,K3) nachgeordneten logischen Verknüpfungsgliedern (G1,G2,G3) eine getrennte Alarm- und Sabotagemeldung (A,S) anzeigbar ist.1. Circuit arrangement for intrusion and fire detection systems for alarm, sabotage and fault monitoring of individual detection lines according to the closed-circuit principle,
characterized in that several alarm and sabotage detectors (M1, M2 ....) are connected to one and the same line (L1), that an evaluation device is provided in a control center (Z) by means of which alarm and sabotage signals are sent independently of one another can be evaluated, a current measuring device (MI) for line resistance determination being arranged in the line, the output of which is connected to a plurality of comparators (K1, E2, K3), and · which corresponds to the number of comparators (K1, K2, K3) receive predetermined, different resistance or current limit values (Imin, I 0 , Imax) as comparison values, so that a separate alarm and sabotage message is sent via the comparators (K1, K2, K3) downstream logic logic elements (G1, G2, G3) (A, S) can be displayed.
dadurch gekennzeichnet, daß in der Auswerteeinrichtung ein Schaltglied (SA) für das Unscharfschalten der Alarmmelder vorgesehen ist, wobei die Sabotagemelder unbeeinfluBbar bleiben.2. Circuit arrangement according to claim 1,
characterized in that a switching element (SA) is provided in the evaluation device for disarming the alarm detectors, the sabotage detectors remaining unaffected.
dadurch ge kennzeichnet, daß in einer mikrocomputergesteuerten Zentrale die Ruhestromwerte pro Linie und die Viderstandswert- bzw. Stromflußänderungen bei Alarm und Sabotage nach dem Einschalten der Anlage meßbar und in einem Schreib-Lese-Speicher abspeicherbar und für Vergleichszwecke abrufbar sind.3. Circuit arrangement according to claim 1 or 2,
characterized in that the closed-circuit current values per line and the resistance value or current flow changes in the event of an alarm and sabotage can be measured in a microcomputer-controlled center and can be measured in a read-write memory and can be called up for comparison purposes.
dadurch gekennzeichnet , daß in den einzelnen Meldern (M1,M2....) ein erster Widerstand (RS) in Serie mit einem Sabotagekonatakt (KS) in der Linie (L1) angeordnet ist, daß zu diesem ersten Widerstand (RS) parallel die Reihenschaltung eines zweiten Widerstandes (RA) und eines Alarmkontaktes (KA) angeordnet ist, wobei die Widerstandswerte so bemessen sind, daß bei gleichzeitigem Ansprechen mehrerer Alarmmelder pro Linie keine Sabotage-oder sonstige Störungsmeldung vortäuschbar ist.4. Circuit arrangement according to one of the preceding claims,
characterized in that in the individual detectors (M1, M2 ....) a first resistor (RS) is arranged in series with a sabotage contact (KS) in the line (L1), that in parallel with this first resistor (RS) Series connection of a second resistor (RA) and an alarm contact (KA) is arranged, the resistance values being dimensioned such that no sabotage or other fault message can be simulated if several alarm detectors per line respond simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT80105763T ATE5108T1 (en) | 1979-09-28 | 1980-09-24 | CIRCUIT ARRANGEMENT FOR BURGLAR OR FIRE ALARM SYSTEMS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2939494 | 1979-09-28 | ||
| DE2939494A DE2939494B2 (en) | 1979-09-28 | 1979-09-28 | Circuit arrangement for intrusion or fire alarm systems |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0026461A2 true EP0026461A2 (en) | 1981-04-08 |
| EP0026461A3 EP0026461A3 (en) | 1981-05-13 |
| EP0026461B1 EP0026461B1 (en) | 1983-10-19 |
Family
ID=6082205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80105763A Expired EP0026461B1 (en) | 1979-09-28 | 1980-09-24 | Circuit arrangement for intrusion or fire alarm systems |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0026461B1 (en) |
| AT (1) | ATE5108T1 (en) |
| DE (1) | DE2939494B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0072187A1 (en) * | 1981-02-06 | 1983-02-16 | Institute For Industrial Research And Standards | Method and apparatus for identifying the location of a change in state of a part of an electrical circuit |
| EP0090399A1 (en) * | 1982-03-29 | 1983-10-05 | Siemens Aktiengesellschaft | Direct current signalling installation |
| EP0098326A1 (en) * | 1982-07-10 | 1984-01-18 | Fritz Fuss Kom.-Ges. | Circuit arrangement for signalling alarms |
| GB2155223A (en) * | 1984-02-29 | 1985-09-18 | Bl Tech Ltd | A circuit |
| FR2594575A1 (en) * | 1986-02-19 | 1987-08-21 | Applic Electro Tech Avance | Self-protection device for surveillance lines |
| EP0419347A1 (en) * | 1989-09-18 | 1991-03-27 | Sté TEXTON | Protection system, especially for motor vehicles, of type comprising an apparatus such as an electronic control device of an alarm arragement |
| EP0424994A2 (en) * | 1986-06-20 | 1991-05-02 | Badger Meter, Inc. | Automatic meter reading system with malfunction protection |
| FR2664408A1 (en) * | 1990-07-04 | 1992-01-10 | Spie Trindel | Monitoring and alarm installation |
| US6952166B2 (en) | 2002-01-16 | 2005-10-04 | Leeds Electronic Engineering Limited | Burglar alarm system having reduced wiring |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3148277C2 (en) * | 1981-12-05 | 1985-05-30 | Friedrich Merk-Telefonbau GmbH, 8000 München | Circuit arrangement for balancing a detection line |
| DE3148278C2 (en) * | 1981-12-05 | 1984-09-20 | Friedrich Merk-Telefonbau GmbH, 8000 München | Circuit arrangement for evaluating the line voltage in alarm lines with several thresholds |
| DE3308455A1 (en) * | 1983-03-10 | 1984-09-13 | Hans-Joachim 5810 Witten Becker | Alarm system for protecting a building |
| DE3624663A1 (en) * | 1986-07-22 | 1988-01-28 | Bosch Gmbh Robert | Circuit arrangement for switching various electrical loads on and off |
| US7999668B2 (en) | 2008-11-17 | 2011-08-16 | GM Global Technology Operations LLC | Series interlock system with integrated ability to identify breached locations |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1503894A (en) * | 1966-10-18 | 1967-12-01 | Alarme Et Telesurveillance A T | Improvements to electrical alarm and surveillance installations |
| US4198625A (en) * | 1978-05-02 | 1980-04-15 | General Signal Corporation | Dual alarm detection on single loop |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH468682A (en) * | 1967-06-26 | 1969-02-15 | Cerberus Ag | Fire alarm system |
-
1979
- 1979-09-28 DE DE2939494A patent/DE2939494B2/en not_active Ceased
-
1980
- 1980-09-24 EP EP80105763A patent/EP0026461B1/en not_active Expired
- 1980-09-24 AT AT80105763T patent/ATE5108T1/en not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1503894A (en) * | 1966-10-18 | 1967-12-01 | Alarme Et Telesurveillance A T | Improvements to electrical alarm and surveillance installations |
| US4198625A (en) * | 1978-05-02 | 1980-04-15 | General Signal Corporation | Dual alarm detection on single loop |
Non-Patent Citations (1)
| Title |
|---|
| ELEKTOR, Band 2, Nr. 1, Januar 1976, Elektor Publishers Ltd, Canterbury, GB, "High security burglar alarm sensor", Seite 149 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0072187A1 (en) * | 1981-02-06 | 1983-02-16 | Institute For Industrial Research And Standards | Method and apparatus for identifying the location of a change in state of a part of an electrical circuit |
| EP0090399A1 (en) * | 1982-03-29 | 1983-10-05 | Siemens Aktiengesellschaft | Direct current signalling installation |
| EP0098326A1 (en) * | 1982-07-10 | 1984-01-18 | Fritz Fuss Kom.-Ges. | Circuit arrangement for signalling alarms |
| GB2155223A (en) * | 1984-02-29 | 1985-09-18 | Bl Tech Ltd | A circuit |
| FR2594575A1 (en) * | 1986-02-19 | 1987-08-21 | Applic Electro Tech Avance | Self-protection device for surveillance lines |
| EP0424994A2 (en) * | 1986-06-20 | 1991-05-02 | Badger Meter, Inc. | Automatic meter reading system with malfunction protection |
| EP0424994A3 (en) * | 1986-06-20 | 1993-12-15 | Badger Meter Inc | Automatic meter reading system with malfunction protection |
| EP0419347A1 (en) * | 1989-09-18 | 1991-03-27 | Sté TEXTON | Protection system, especially for motor vehicles, of type comprising an apparatus such as an electronic control device of an alarm arragement |
| FR2664408A1 (en) * | 1990-07-04 | 1992-01-10 | Spie Trindel | Monitoring and alarm installation |
| US6952166B2 (en) | 2002-01-16 | 2005-10-04 | Leeds Electronic Engineering Limited | Burglar alarm system having reduced wiring |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0026461A3 (en) | 1981-05-13 |
| EP0026461B1 (en) | 1983-10-19 |
| ATE5108T1 (en) | 1983-11-15 |
| DE2939494B2 (en) | 1981-07-02 |
| DE2939494A1 (en) | 1981-04-02 |
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