EP0468097B1 - Dispositif pour signaler les risques - Google Patents

Dispositif pour signaler les risques Download PDF

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Publication number
EP0468097B1
EP0468097B1 EP90124908A EP90124908A EP0468097B1 EP 0468097 B1 EP0468097 B1 EP 0468097B1 EP 90124908 A EP90124908 A EP 90124908A EP 90124908 A EP90124908 A EP 90124908A EP 0468097 B1 EP0468097 B1 EP 0468097B1
Authority
EP
European Patent Office
Prior art keywords
loop
switches
detector
line
wires
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 - Lifetime
Application number
EP90124908A
Other languages
German (de)
English (en)
Other versions
EP0468097A2 (fr
EP0468097A3 (en
Inventor
Peer Dr.-Ing. Thilo
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
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0468097A2 publication Critical patent/EP0468097A2/fr
Publication of EP0468097A3 publication Critical patent/EP0468097A3/de
Application granted granted Critical
Publication of EP0468097B1 publication Critical patent/EP0468097B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
    • G08B26/005—Alarm systems in which substations are interrogated in succession by a central station with substations connected in series, e.g. cascade

Definitions

  • the invention relates to a hazard detection system with chain synchronization, which works according to the principle of the pulse detection system, whereby in the course of a double line designed as a loop for forward and reverse operation and connected to a control center, a plurality of detectors, each blocking at least two in one direction but in both directions have conductive switches, are arranged, and these switches are inserted so that one can block for forward and one for reverse operation of the loop.
  • the detectors of this alarm system each have two switches, both of which are arranged in one of the two wires of the double line, so that there is one on the right and one on the left of the connection between the detector and the wire.
  • These are transistor switches that contain a technological substrate diode, so that they can only interrupt the line in one direction, namely the blocking direction of the diode, while in the other direction the diode conducts even when the transistor is blocking.
  • the two transistor switches are arranged so that their respective substrate diodes have opposite polarities. They are driven together so that both transistors block or open, while only one of the diodes blocks and the other conducts. The path resistance of the conductive diodes is noticeable.
  • the two cores of the double line can be influenced by external electromagnetic interference in such a way that line interference occurs.
  • These external disturbances can originate, for example, from other lines routed in the same cable or can also result from external interference sources, such as, for example, from mobile radio devices or from fluorescent lamps. In any case, they lead to interference voltages on the two wires of the double line and overlap the useful signals in such a way that, in the worst case, the latter are no longer correctly recognized and transmission errors occur.
  • these interference voltages are essentially the same in size and direction and their effect can be compensated for in a known manner by a symmetrical connection of the transmission devices. However, this possibility is reduced to the extent that the line symmetry is disturbed, be it by different resistances or lengths of the interconnected wires of the double line.
  • the wires are always the same length with respect to the detector that is currently switched on, and the switch resistances in both wires are also approximately the same size.
  • the requirement of four switches per detector now leads to a doubling of the switch resistance when switched on and also to an increase in costs.
  • the object of the invention is to achieve an increase in immunity to interference in a hazard detection system with chain synchronization, which works on the principle of the pulse detector system, and in which the detectors are arranged in the course of a loop designed as a loop, without the disadvantages of an increase in costs and of the switch resistance on the line.
  • the arrangement of the switches in a detector according to the invention considerably improves the line symmetry in the switched-through state compared to the arrangement with two switches in one wire known from EP 0 347 806, since in it only the difference in the switch resistances deteriorates the line symmetry, but not the sum, as in the known arrangement.
  • the interference immunity is significantly improved, since even with conductive diodes only interference signals with a level that is greater than the kink voltage of the diodes.
  • Another advantage of the arrangement of the switches in a detector according to the invention is that this detector can also be used in hazard detection systems without a loop arrangement, with swapping the terminals of one of the two wires ensuring that a switch is arranged in each wire in a known manner and by simultaneous actuation of both switches a high line symmetry is achieved.
  • the detectors are arranged on the line in such a way that both the respective switches for forward operation and the respective switches for reverse operation of the loop are alternately in one of the two wires. This ensures that the maximum extent of the asymmetrical line section is limited to the line section between two detectors.
  • Fig. 1 shows the structure of a detector according to the invention.
  • the detector contains a measuring and control device MS, which is connected via the connections K and M to the double line consisting of the wires a and b.
  • a capacitor C is charged via a diode D3 and supplies the measuring and control device MS with energy via the UV connection when there is no voltage on the double line.
  • the detector is connected to the previous detector via terminals a11 and b11 and to the subsequent detector via terminals a12 and b12.
  • a V-MOS transistor T2 with a substrate diode D2 is arranged as a switch between the terminal a11 and the terminal K.
  • the diode D2 is contained in the transistor T2 for technological reasons and cannot be omitted.
  • the V-MOS transistor T1 with its substrate diode D1 is arranged between the terminal M and the terminal b12.
  • the transistors T1 and T2 are inserted in such a way that when the double line is operated from the left, only the transistor T1 can interrupt the line for subsequent detectors connected to terminals a12 and b12 and for operation of the double line only the transistor T2 from the right for detectors connected to terminals a11 and b11.
  • two detectors are connected in series in the manner according to the invention, for example.
  • the detector M2 following the detector M1 is connected in reverse to the detector M1, so that the terminals a12 and b12 of the detector M1 are connected to the terminals a22 and b22 of the detector M2.

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
  • Cookers (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Thermally Insulated Containers For Foods (AREA)
  • Burglar Alarm Systems (AREA)
  • Control Of Conveyors (AREA)
  • Emergency Lowering Means (AREA)
  • Emergency Alarm Devices (AREA)

Claims (2)

  1. Installation de signalisation de danger ayant un système de synchronisation en chaîne, qui opère selon le principe du système de signalisation d'impulsions, dans laquelle le long d'une ligne double (a, b), qui est réalisée sous forme de boucle pour le fonctionnement dans le sens direct et le fonctionnement dans le sens rétrograde et est reliée à un central, sont disposés une multiplicité d'avertisseurs, qui ont chacun au moins deux interrupteurs (T1, T2), qui ne réalisent un blocage que dans une direction qui, mais, à l'état passant, sont conducteurs dans les deux sens, et dans laquelle les interrupteurs (T1, T2) sont insérés de telle sorte que l'un d'eux peut être bloquant pour le fonctionnement dans le sens direct et que l'autre peut être bloquant pour le fonctionnement dans le sens rétrograde de la boucle,
       caractérisée en ce que
       dans chaque avertisseur (M1), au moins un interrupteur (T1, T2) est disposé dans chacun des deux conducteurs (a, b) de la ligne double.
  2. Installation de signalisation de danger suivant la revendication 1,
       caractérisée en ce que
       les avertisseurs (M1, M2) sont disposés dans la ligne de telle sorte qu'à la fois chacun des interrupteurs pour le fonctionnement dans le sens direct (T11, T12) et chacun des interrupteurs pour le fonctionnement dans le sens rétrograde (T21, T12) de la boucle sont disposés alternativement dans l'un des deux conducteurs (a, b).
EP90124908A 1990-07-26 1990-12-20 Dispositif pour signaler les risques Expired - Lifetime EP0468097B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4023765 1990-07-26
DE4023765 1990-07-26

Publications (3)

Publication Number Publication Date
EP0468097A2 EP0468097A2 (fr) 1992-01-29
EP0468097A3 EP0468097A3 (en) 1993-02-03
EP0468097B1 true EP0468097B1 (fr) 1994-09-07

Family

ID=6411060

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90124908A Expired - Lifetime EP0468097B1 (fr) 1990-07-26 1990-12-20 Dispositif pour signaler les risques

Country Status (4)

Country Link
EP (1) EP0468097B1 (fr)
AT (1) ATE111247T1 (fr)
DE (1) DE59007077D1 (fr)
ES (1) ES2062281T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19800049A1 (de) * 1998-01-02 1999-07-08 Philips Patentverwaltung Anordnung zum Übertragen von Daten und/oder Energie mit Trenneinheit
US7533517B2 (en) * 2005-04-14 2009-05-19 Snecma Exhaust nozzle for an engine of a flying craft
DE102005037047B3 (de) * 2005-08-05 2006-12-28 Novar Gmbh Gebäudeleittechnik- oder Gefahrenmeldeanlage
US7535687B2 (en) 2006-04-13 2009-05-19 Ge Security, Inc. Alarm system sensor topology apparatus and method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0111178B1 (fr) * 1982-11-23 1987-10-28 Cerberus Ag Dispositif de contrôle avec plusieurs détecteurs connectés, en forme de chaîne, à une ligne de signalisation
DE3424294A1 (de) * 1984-07-02 1986-01-09 Siemens AG, 1000 Berlin und 8000 München Abfrageeinrichtung zur identifikation der stellung von schaltern
DE3614692A1 (de) * 1986-04-30 1987-11-05 Nixdorf Computer Ag Gefahrenmeldeanlage
DE58903502D1 (de) * 1988-06-23 1993-03-25 Siemens Ag Gefahrenmeldeanlage.

Also Published As

Publication number Publication date
EP0468097A2 (fr) 1992-01-29
DE59007077D1 (de) 1994-10-13
ES2062281T3 (es) 1994-12-16
ATE111247T1 (de) 1994-09-15
EP0468097A3 (en) 1993-02-03

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