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EP0026461B1 - Circuit pour systèmes de détection d'intrusion ou d'incendie - Google Patents

Circuit pour systèmes de détection d'intrusion ou d'incendie Download PDF

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Publication number
EP0026461B1
EP0026461B1 EP80105763A EP80105763A EP0026461B1 EP 0026461 B1 EP0026461 B1 EP 0026461B1 EP 80105763 A EP80105763 A EP 80105763A EP 80105763 A EP80105763 A EP 80105763A EP 0026461 B1 EP0026461 B1 EP 0026461B1
Authority
EP
European Patent Office
Prior art keywords
alarm
line
sabotage
contact
resistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP80105763A
Other languages
German (de)
English (en)
Other versions
EP0026461A2 (fr
EP0026461A3 (en
Inventor
Karlheinz Ing. Grad. Schreyer
Luc Den Dooven
Dietrich Dipl.-Ing Bornewasser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6082205&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0026461(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT80105763T priority Critical patent/ATE5108T1/de
Publication of EP0026461A2 publication Critical patent/EP0026461A2/fr
Publication of EP0026461A3 publication Critical patent/EP0026461A3/de
Application granted granted Critical
Publication of EP0026461B1 publication Critical patent/EP0026461B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • 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 a circuit arrangement for intrusion and fire detection systems for alarm, sabotage and fault monitoring of individual detection lines according to the closed-circuit principle with a current measuring device arranged in a control center in the detection line for determining the line resistance, the output of which is connected to a plurality of comparators, and with Detectors, each with an alarm and a tamper contact, which are connected to the same line.
  • alarm systems In addition to the actual alarm detectors, alarm systems generally also have so-called sabotage detectors.
  • the sabotage detectors protect the alarm detector against manipulation.
  • the alarm detectors In addition to the actual alarm contact, the alarm detectors also have an additional contact, which can be opened if the detector is opened without permission, e.g. B. removal of the housing cover, a so-called tamper 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 lines.
  • a fire alarm system is known from DE-OS 2 154 537, in which the line in the control center is monitored for an 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 therefore 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 signal.
  • the response of an alarm or sabotage detector should result in a certain, but almost equally large change in resistance. Appropriate training of the detectors and a suitable evaluation device in the control center are necessary for this.
  • This object is achieved in that several detectors are connected to a line, that in the individual detectors a first resistor in series with the sabotage contact in the line and in parallel with this first resistor, the series connection of a second resistor with the alarm contact are arranged, wherein the resistance values are dimensioned such that the response of an alarm contact or the simultaneous response of the alarm contacts of several detectors causes a line resistance change which can be distinguished from the response of a sabotage contact and which receives, by means of the comparators, the different resistance or current limit values predetermined according to their number as comparison variables, and with A separate, independent alarm and sabotage message is displayed to the logic gates downstream of the comparators.
  • 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.
  • Several detectors are connected to one detection line, each with a first resistor in series with a tamper contact in the line and parallel to this a second resistor in series with an alarm contact.
  • the resistance values are dimensioned such that the response of an alarm contact causes a change in line resistance that can be distinguished from the response of a sabotage contact ken.
  • the evaluation device located in the control center monitors the current applied to the line by a voltage source.
  • the current flowing on the line and thus the resistance of the line is measured on a current measuring device arranged in the line and is passed to a number of 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, 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 circuit arrangement according to the invention has the advantage that the response of an alarm or tamper contact causes a distinguishable but defined change in resistance on the detector line, which is approximately the same size regardless of which detector has responded. This makes it possible to connect a large number of detectors to one detection line.
  • each detector has a very simple structure with few components.
  • the figure shows the evaluation device in the control center Z and a line L 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 I.
  • the line current is a measure of the total resistance of the detector line L1.
  • the value of the measured line current is fed from the output of the measuring device MI to the first inputs of three comparators K1, K2, K3.
  • the comparators are known comparators, e.g. B. BE TCA 345A (Siemens), which compare a continuously variable size with a second size, the reference size. As long as the continuously variable size is larger than the comparison value, the output has a level which, for. B. corresponds to the logical »0«, in the other case to the logical »1.
  • the specified current limit values e.g. B.
  • the output of the comparator K1 goes to a first input of an AND gate G1
  • the output of the comparator K2 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 tamper contact KS and a resistor RS 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 circuit arrangement functions as follows:
  • the line current I measured in the current measuring device MI in the center is fed to the comparator K1, K2, K3.
  • the line has 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 K3 compares the line current I with the upper tolerance limit of the quiescent current Imax. In case of deviations the outputs of the comparators K1, K2, K3 activated and a message displayed.
  • the first case is indicated via the output of the comparator K2, the second and third case via the comparator K3 and the OR gate G3 connected downstream of the two comparators K2 and K3 as a sabotage message "S".
  • An alarm message is only available 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.

Landscapes

  • 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)

Claims (3)

1. Circuit pour des installations de signalisation d'effraction et d'incendie servant à contrôler, du point de vue d'une alarme, d'un sabotage et d'une perturbation, différentes lignes de signalisation (L1, L2, ...) selon le principe du courant de repos et comportant un dispositif ampèremétri- que (MI) branché, dans le central (Z), dans la ligne de signalisation (L1) en vue de la détermination de la résistance de la ligne et dont la sortie est reliée à plusieurs comparateurs (K1, K2, K3), et comportant des avertisseurs (M1, M2, ...), qui possèdent chacun un contact d'alarme et un contact d'état de sabotage (KA, KS), qui sont raccordés à une même ligne (L1), caractérisé en ce que plusieurs avertisseurs (M1, M2, ...) sont raccordés à une ligne (L1 ), que dans les différents avertisseurs (M1, M2, ...) une première résistance (RS) est branchée en série avec le contact d'état de sabotage (KS) dans la ligne (L1) et que le circuit série formé d'une seconde résistance (RA) et du contact d'alarme (KA) est branché en parallèle avec cette première résistance (RS), les valeurs des résistances étant dimensionnées de telle manière que la réponse d'un contact d'alarme (KA) ou la réponse simultanée des contact d'alarme de plusieurs avertisseurs entraîne une. modification de la résistance de ligne, différenciable de la réponse d'un contact d'état de sabotage (SK) et qui indique, au moyen des comparateurs (K1, K2, K3), qui reçoivent en tant que grandeurs de comparaison les différentes valeurs de résistance ou d'intensité limite (Imin, 10, Imax), prédéterminées en fonction du nombre des comparateurs, et à l'aide d'organes de combina- tion logique (G1, G2, G3) branchés en aval des comparateurs (K1, K2, K3), des signalisations séparées (A, S) d'alarme et de sabotage indépendantes l'une de l'autre.
2. Circuit selon la revendication 1, caractérisé en ce que dans le dispositif d'exploitation est prévu un organe de commutation (SA) servant au branchement sans précision des avertisseurs d'alarme, sans aucune influence sur les avertisseurs de sabotage.
3. Circuit selon la revendication 1 ou 2, caractérisé en ce que dans un central commandé par microcalculateur, les valeurs des courants de repos pour chaque ligne et les modifications de la valeur de la résistance ou du flux de courant dans le cas d'une alarme ou d'un sabotage sont mesurables après le branchement d'installation et peuvent être mémorisés dans une mémoire d'enregistrement et de lecture et peuvent être interrogés à des fins de comparaison.
EP80105763A 1979-09-28 1980-09-24 Circuit pour systèmes de détection d'intrusion ou d'incendie Expired EP0026461B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80105763T ATE5108T1 (de) 1979-09-28 1980-09-24 Schaltungsanordnung fuer einbruch- oder feuermeldeanlagen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2939494 1979-09-28
DE2939494A DE2939494B2 (de) 1979-09-28 1979-09-28 Schaltungsanordnung für Einbruch- oder Feuermeldea nlagen

Publications (3)

Publication Number Publication Date
EP0026461A2 EP0026461A2 (fr) 1981-04-08
EP0026461A3 EP0026461A3 (en) 1981-05-13
EP0026461B1 true EP0026461B1 (fr) 1983-10-19

Family

ID=6082205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105763A Expired EP0026461B1 (fr) 1979-09-28 1980-09-24 Circuit pour systèmes de détection d'intrusion ou d'incendie

Country Status (3)

Country Link
EP (1) EP0026461B1 (fr)
AT (1) ATE5108T1 (fr)
DE (1) DE2939494B2 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072187A1 (fr) * 1981-02-06 1983-02-16 Institute For Industrial Research And Standards Méthode et dispositif pour déterminer le lieu de changement d'état d'une partie d'un circuit électrique
DE3148277C2 (de) * 1981-12-05 1985-05-30 Friedrich Merk-Telefonbau GmbH, 8000 München Schaltungsanordnung zum Abgleich einer Meldelinie
DE3148278C2 (de) * 1981-12-05 1984-09-20 Friedrich Merk-Telefonbau GmbH, 8000 München Schaltungsanordnung zum Auswerten der Linienspannung bei Meldelinien mit mehreren Schwellen
DE3211550C2 (de) * 1982-03-29 1985-02-14 Siemens AG, 1000 Berlin und 8000 München Gleichstrommeldeanlage
DE3268015D1 (en) * 1982-07-10 1986-01-30 Fuss Fritz Kg Circuit arrangement for signalling alarms
DE3308455A1 (de) * 1983-03-10 1984-09-13 Hans-Joachim 5810 Witten Becker Alarmanlage zur absicherung eines gebaeudes
GB2155223B (en) * 1984-02-29 1987-07-08 Bl Tech Ltd A circuit
FR2594575B1 (fr) * 1986-02-19 1988-07-01 Applic Electro Tech Avance Dispositif d'autogarde pour lignes de surveillance
US4817131A (en) * 1986-06-20 1989-03-28 Badger Meter, Inc. Automatic meter reading system
DE3624663A1 (de) * 1986-07-22 1988-01-28 Bosch Gmbh Robert Schaltungsanordnung zum ein- und ausschalten unterschiedlicher elektrischer verbraucher
FR2652184B1 (fr) * 1989-09-18 1994-05-13 Texton Systeme de protection, notamment pour vehicules automobiles, du type comprenant un dispositif electronique de commande d'un dispositif d'alarme.
FR2664408A1 (fr) * 1990-07-04 1992-01-10 Spie Trindel Installation de surveillance et d'alarme.
DE60210738T2 (de) 2002-01-16 2007-04-12 Leeds Electronic Eng. Ltd. Diebstahlschutzalarm mit reduzierter Verdrahtung
US7999668B2 (en) 2008-11-17 2011-08-16 GM Global Technology Operations LLC Series interlock system with integrated ability to identify breached locations

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1503894A (fr) * 1966-10-18 1967-12-01 Alarme Et Telesurveillance A T Perfectionnements aux installations électriques d'alarme et de surveillance
CH468682A (de) * 1967-06-26 1969-02-15 Cerberus Ag Feuermeldeanlage
US4198625A (en) * 1978-05-02 1980-04-15 General Signal Corporation Dual alarm detection on single loop

Also Published As

Publication number Publication date
DE2939494A1 (de) 1981-04-02
DE2939494B2 (de) 1981-07-02
ATE5108T1 (de) 1983-11-15
EP0026461A2 (fr) 1981-04-08
EP0026461A3 (en) 1981-05-13

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