EP0468234B1 - Procédé pour l'élévation de la sécurité de perturbation dans un système de signalisation de risque - Google Patents

Procédé pour l'élévation de la sécurité de perturbation dans un système de signalisation de risque Download PDF

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Publication number
EP0468234B1
EP0468234B1 EP91110971A EP91110971A EP0468234B1 EP 0468234 B1 EP0468234 B1 EP 0468234B1 EP 91110971 A EP91110971 A EP 91110971A EP 91110971 A EP91110971 A EP 91110971A EP 0468234 B1 EP0468234 B1 EP 0468234B1
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EP
European Patent Office
Prior art keywords
detector
detectors
line
switch
information
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
EP91110971A
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German (de)
English (en)
Other versions
EP0468234A2 (fr
EP0468234A3 (en
Inventor
Klaus Kaiser
Otto Walter Dipl.-Ing. Moser
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
Original Assignee
Siemens AG
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Filing date
Publication date
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Publication of EP0468234A2 publication Critical patent/EP0468234A2/fr
Publication of EP0468234A3 publication Critical patent/EP0468234A3/de
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Publication of EP0468234B1 publication Critical patent/EP0468234B1/fr
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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR 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 method for increasing the immunity to interference in alarm systems with chain synchronization according to the preamble of claim 1.
  • Transmission systems with chain synchronization work in such a way that the detectors arranged in the course of a double line, one after the other, are switched on in the line and then, immediately afterwards, send their message and / or receive a control command (DE-AS 25 33 354).
  • DE-AS 25 33 354 a control command
  • a switch is arranged in each detector, which is preferably formed by a switching transistor, which has the task of interrupting or connecting a wire of the double line if necessary.
  • the message to be transmitted is formed by the time of the switching process.
  • each detector switches on the following detector after a time delay (time slot) corresponding to its measured value, as described in DE-AS 25 33 382.
  • An additional voltage pulse which is sent by the control center in this time slot, serves as a control command.
  • Line interference now occurs due to the fact that the two wires of the double line are influenced by external electromagnetic interference.
  • These disturbances can originate, for example, from other lines routed in the same cable or else originate from external sources of interference. In any case, they lead to interference on the two wires and are superimposed on the useful signals in such a way that, in the worst case, these are no longer correctly recognized and transmission errors occur.
  • these interference voltages are essentially the same in size and direction. If very large interference voltages occur, for example due to lightning strikes in the immediate vicinity of the line, individual switches, which are usually field effect transistors, can be damaged so much that they can no longer close or that they remain permanently closed.
  • the invention is based on the object of reducing the influence of the interference voltages coupled into the transmission line without reducing the transmission speed or jeopardizing compliance with the postal regulations due to excessive useful signals.
  • the two-wire signaling line is balanced during the time of the information transmission from one detector to the control center.
  • the information is only transmitted if all switching transistors, i.e. all detectors are switched through.
  • the control center sends out pulses which cause the detectors to close their switching transistors, information being given by a detector only when the pulse reaches its input unchanged, a detector preceding a detector only then leaving the pulse unchanged let pass if he has already given information. This ensures that faults on both wires of the double line are of the same size and are compensated for with the help of the balun in the control center.
  • control center sends short pulses which can be extended by a detector by actuating its switch, so that subsequent detectors cannot give any information.
  • control panel sends long pulses that can be shortened by a detector by actuating its switch, so that subsequent detectors cannot give any information.
  • FIG. 1 shows a hazard alarm system in which the individual detectors M1-Mn are connected to a control center Z via a double line a, b.
  • each detector contains a switch S or switching transistor in each core of the double line a, b.
  • the detector is connected to the control center via terminals a1 / b1.
  • the capacitor C is charged via the diode D and, if there is no voltage on the line, supplies the detector electronics, which consist of the clock generator Ta and the signaling and control device M + S.
  • the communication of the signaling and transmission device M + S with the control center Z takes place via the communication interface K.
  • Switching transistors T1, T3, which are controlled directly or via a further transistor T2 by the signaling and control device M + S, are used for switching to the next detector, which is connected via the terminals a2 / b2 and a corresponding line section. Both switches realized by switching transistors T1, T3 are opened or closed together.
  • FIG. 3 Another possible implementation of a hazard detector is shown in FIG. 3.
  • This detector contains a switch implemented by a transistor T1 in only one wire.
  • a resistor R for balancing the line is inserted in the other wire. If a detector contains a switch in only one wire of the double line, the line can only be balanced if all switches are connected by.
  • the individual detectors are addressed by the pulses sent by the control center. A detector only provides information if these pulses reach its input unchanged and it has not yet given any information, the detector in question then leaving its switching transistor closed.
  • Figure 4 shows possible voltage profiles on the individual detectors when the control panel sends short pulses.
  • all switches are closed and the open circuit voltage UR is on the line.
  • the control center applies the starting voltage US to the line in pulses. This opens the switches of all detectors.
  • the control center applies the interrogation voltage UA to the line. Since all switches are open, the interrogation voltage is only at the input of the detector M1, so that only this is caused to issue its message at time t3. So that the line is symmetrical during the transmission, all switches are closed again at time t3.
  • the control center again applies the starting voltage US to the line, whereupon all detectors which have not yet given a message open their switches again.
  • the control center again applies the interrogation voltage UA to the line. Since the switch of detector M1 is closed, the interrogation voltage UA also reaches the input of detector M2. This causes the detector M2 to issue its message. After he has given his message, he also leaves his switch closed, regardless of the line voltage. This process continues until the last one Notifier has submitted his message. The control center then applies the open circuit voltage UR to the line again and starts the interrogation cycle again after some time.
  • FIG. 5 shows the voltage profiles on the individual detectors when the control panel emits long pulses.
  • the open circuit voltage UR is again on the line. All switches are closed.
  • the line voltage from the control center is reduced to the start voltage US, the start voltage US being less than the quiescent voltage UR but greater than the query voltage UA.
  • the switches are opened so that the input voltage on all detectors, except detector M1, drops to 0 volts.
  • the long pulse only reaches the input of detector M1, which causes it to emit its message at time t3.
  • all switches are closed again, so that the line is symmetrical during the information transmission.
  • the starting voltage US is again applied to the line at time t4.

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
  • Selective Calling Equipment (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Emergency Alarm Devices (AREA)
  • Small-Scale Networks (AREA)

Claims (3)

  1. Procédé pour l'élévation de la sécurité de perturbation dans un système de signalisation de risque à synchronisation en chaîne, les signalisateurs (M1-Mn) étant situés sur le parcours d'une ligne double (a, b) reliée à une centrale (Z) au moyen d'une interconnexion de ligne, et au moins un commutateur (S) étant prévu, sous forme d'un transistor de commutation, dans chaque signalisateur pour l'interruption ou l'interconnexion de l'une des lignes; caractérisé en ce que, lors de l'interrogation cyclique des signalisateurs, pendant la transmission d'informations d'un signalisateur à la centrale (Z), les deux fils (a, b) de la double ligne sont interconnectés de manière symétrique, c'est-à-dire avec des conditions de résistance identiques, ce pour quoi, d'une part, dans chaque signalisateur dans le fil de la ligne qui n'a pas de transistor de commutation, est situé soit un autre transistor de commutation, soit une résistance ayant une valeur de résistance correspondante à la résistance de passage du transistor de commutation et, d'autre part, des impulsions sont envoyées par la centrale (Z), lesquelles impulsions amènent les signalisateurs à fermer leur transistor de commutation resp. leurs transistors de commutation, une information n'étant délivrée par un signalisateur que si l'impulsion arrive inchangée à son entrée, un signalisateur situé avant un signalisateur ne laissant passer l'impulsion inchangée que s'il a déjà délivré une information.
  2. Procédé selon la revendication 1, caractérisé en ce que la centrale (Z) envoie des impulsions courtes qui peuvent être allongées par un signalisateur par actionnement de son commutateur (S), de manière à ce que les signalisateurs qui suivent ne puissent délivrer aucune information.
  3. Procédé selon la revendication 1, caractérisé en ce que la centrale (Z) envoie des impulsions longues qui peuvent être raccourcies par un signalisateur par actionnement de son commutateur (S), de manière à ce que les signalisateurs qui suivent ne puissent délivrer aucune information.
EP91110971A 1990-07-26 1991-07-02 Procédé pour l'élévation de la sécurité de perturbation dans un système de signalisation de risque Expired - Lifetime EP0468234B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4023766 1990-07-26
DE4023766 1990-07-26

Publications (3)

Publication Number Publication Date
EP0468234A2 EP0468234A2 (fr) 1992-01-29
EP0468234A3 EP0468234A3 (en) 1992-12-09
EP0468234B1 true EP0468234B1 (fr) 1996-09-25

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EP91110971A Expired - Lifetime EP0468234B1 (fr) 1990-07-26 1991-07-02 Procédé pour l'élévation de la sécurité de perturbation dans un système de signalisation de risque

Country Status (4)

Country Link
EP (1) EP0468234B1 (fr)
AT (1) ATE143519T1 (fr)
DE (1) DE59108219D1 (fr)
ES (1) ES2091265T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7533517B2 (en) * 2005-04-14 2009-05-19 Snecma Exhaust nozzle for an engine of a flying craft
US7535687B2 (en) 2006-04-13 2009-05-19 Ge Security, Inc. Alarm system sensor topology apparatus and method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH664637A5 (de) * 1982-04-28 1988-03-15 Cerberus Ag Verfahren zur uebertragung von messwerten in einem ueberwachungssystem.

Also Published As

Publication number Publication date
EP0468234A2 (fr) 1992-01-29
ATE143519T1 (de) 1996-10-15
DE59108219D1 (de) 1996-10-31
ES2091265T3 (es) 1996-11-01
EP0468234A3 (en) 1992-12-09

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