EP0468234A2 - 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

Info

Publication number
EP0468234A2
EP0468234A2 EP91110971A EP91110971A EP0468234A2 EP 0468234 A2 EP0468234 A2 EP 0468234A2 EP 91110971 A EP91110971 A EP 91110971A EP 91110971 A EP91110971 A EP 91110971A EP 0468234 A2 EP0468234 A2 EP 0468234A2
Authority
EP
European Patent Office
Prior art keywords
detector
switch
detectors
control center
line
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.)
Granted
Application number
EP91110971A
Other languages
German (de)
English (en)
Other versions
EP0468234B1 (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
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 EP0468234A2 publication Critical patent/EP0468234A2/fr
Publication of EP0468234A3 publication Critical patent/EP0468234A3/de
Application granted granted Critical
Publication of EP0468234B1 publication Critical patent/EP0468234B1/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 method for increasing the interference immunity in hazard detection systems with chain synchronization, the detectors being arranged in the course of a double line connected to a central unit by means of a line connection, and at least one switch for interrupting or connecting one of the lines is provided in each detector.
  • Transmission systems with chain synchronization work in such a way that the detectors arranged in the course of a double line are switched on one after the other into the line and then, immediately afterwards, send their message and / or receive a control command. In this way, it is possible to assign a unique address to each detector without having to set it with additional equipment or operating effort.
  • a switch is arranged in each detector, 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, an additional voltage pulse is used as a control command, which is sent by the control center in this time slot.
  • the transmission security is increasingly endangered by interference voltages on the line, because on the one hand the shorter signals can be disturbed more easily and on the other hand because the amplitude of these signals is reduced to comply with postal regulations while the disruptions remain the same.
  • an increase in interference voltages must be expected because the electromagnetic pollution caused by e.g. Mobile telephony, microwave devices, fluorescent lamps etc. generally increase and, on the other hand, loop technology is becoming more important in hazard detection technology, but this leads to longer cables and thus greater interference.
  • particularly large interference can damage complete transmission equipment or parts of transmission equipment in such a way that transmission is no longer possible even after the interference has subsided.
  • a preferred endangered part is the switch used for the line interruption.
  • Line interference now occurs because the two wires of the double line are influenced by external electromagnetic interference.
  • These disturbances can e.g. start from other cables in the same cable or come 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, they are no longer correctly recognized and transmission errors occur.
  • these interference voltages are essentially the same in size and direction.
  • very large interference voltages occur, e.g. Lightning strikes in the immediate vicinity of the line can damage individual switches, which are usually field effect transistors, so 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. In addition, at least limited operation should remain possible even if a line switch is destroyed.
  • the object is achieved in that the two wires of the double line are connected through or interrupted symmetrically with respect to this detector during the information transmission from one detector to the control center.
  • each detector has a switch in each wire, both switches switching through and interrupting at the same time. This ensures that the two wires of the double line are of equal length during the information transmission from one detector to the control center, and thus the disturbances are of the same size.
  • the switch of a detector connects during the information transmission from one of the detectors to the control center and in the core of the double line, which has no switch, a resistor for balancing the line is looped in, a message from the detector only being given then can be if a time slot that occurs after a start signal issued by the control center for all detectors is assigned to an address that is stored in a memory provided in the detector.
  • a further embodiment of the method according to the invention consists in that the switch of a detector connects through during the information transmission from one of the detectors to the control center, whereby information can only be given by a detector if a pulse sent by the control center arrives unchanged at its input, a detector preceding a detector only allowing the pulse to pass unchanged if it has already given information.
  • 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 center sends long pulses, which can be shortened by a detector by actuating its switch, so that subsequent detectors cannot give any information.
  • Fig. 1 shows a hazard detection 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 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 consists of the clock generator Ta and the signaling and control device M + S.
  • the communication of the signaling and transmitting device M + S with the control center 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 switched on via the terminals a2 / b2 and a corresponding line section. Both switches realized by switching transistors T1, T3 are opened or closed together.
  • a Ge Driving 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. The detector also contains a memory Sp in which an address is stored. This address is assigned to a time slot that occurs after a start signal issued by the control center for all detectors. The detector can only report within this time slot.
  • a detector contains a switch in only one core of the double line, the line can only be balanced if all switches are connected.
  • the individual detectors are then addressed in that the central station sends pulses and a detector can only provide information if these pulses reach its input unchanged and it has not yet given any information.
  • Fig. 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 present on the line.
  • the control center applies the starting voltage US to the line in pulses. This opens the switches of all detectors.
  • the interrogation voltage UA is applied to the line from the control center. Since all switches are open, the voltage is only at the input of detector M1, so that only this is caused to emit 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 M2 detector 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 detector has submitted his report. 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 at 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 drops to O V on all detectors except detector M1.
  • the long pulse only arrives at 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)
  • Small-Scale Networks (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Emergency Alarm Devices (AREA)
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 true EP0468234A2 (fr) 1992-01-29
EP0468234A3 EP0468234A3 (en) 1992-12-09
EP0468234B1 EP0468234B1 (fr) 1996-09-25

Family

ID=6411061

Family Applications (1)

Application Number Title Priority Date Filing Date
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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007121162A1 (fr) * 2006-04-13 2007-10-25 Ge Security, Inc. Appareil et procédé faisant appel à une topologie de capteurs de système d'alarme
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.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007121162A1 (fr) * 2006-04-13 2007-10-25 Ge Security, Inc. Appareil et procédé faisant appel à une topologie de capteurs de système d'alarme
US7535687B2 (en) 2006-04-13 2009-05-19 Ge Security, Inc. Alarm system sensor topology apparatus and method

Also Published As

Publication number Publication date
EP0468234B1 (fr) 1996-09-25
EP0468234A3 (en) 1992-12-09
ES2091265T3 (es) 1996-11-01
ATE143519T1 (de) 1996-10-15
DE59108219D1 (de) 1996-10-31

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