EP0243928A2 - Système de signalisation des risques - Google Patents

Système de signalisation des risques Download PDF

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Publication number
EP0243928A2
EP0243928A2 EP87106112A EP87106112A EP0243928A2 EP 0243928 A2 EP0243928 A2 EP 0243928A2 EP 87106112 A EP87106112 A EP 87106112A EP 87106112 A EP87106112 A EP 87106112A EP 0243928 A2 EP0243928 A2 EP 0243928A2
Authority
EP
European Patent Office
Prior art keywords
line
circuit
detector
voltage
counter
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.)
Withdrawn
Application number
EP87106112A
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German (de)
English (en)
Other versions
EP0243928A3 (fr
Inventor
Wolfgang Seidel
Eckhard Schultz
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.)
Wincor Nixdorf International GmbH
Nixdorf Computer AG
Original Assignee
Wincor Nixdorf International GmbH
Nixdorf Computer 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
Application filed by Wincor Nixdorf International GmbH, Nixdorf Computer AG filed Critical Wincor Nixdorf International GmbH
Publication of EP0243928A2 publication Critical patent/EP0243928A2/fr
Publication of EP0243928A3 publication Critical patent/EP0243928A3/fr
Withdrawn legal-status Critical Current

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    • 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 an alarm system comprising a central station, at least one two-wire detection line having a plurality of parallel between the conductors of the M elde- line connected detectors, each with a transducer and an alarm circuit and an alarm line with the center line connecting control circuit for controlling the Detection line voltage and for monitoring and evaluation of the line current, at least one wire of the detection line in each detector can be interrupted by a switch and the switches can be closed successively after the application of a line voltage at one end of the detection line and the line control circuit a counter for counting the has detectors connected to the line control circuit by closing the switches.
  • the detectors of the detection line must be queried at short intervals whether an alarm is present or not.
  • An operating voltage is first applied to the first detector in the zone. After a certain delay, the duration of which can be influenced by the transducer or the fire parameters, the first detector closes the switch and sends a counting pulse to the control center. The operating voltage is then applied to the second detector. The detector that has signaled an alarm can be identified by counting in the control center.
  • the permanent polling of the zones requires considerable effort.
  • Another disadvantage is that the constant interrogation of the detection lines, for example, can quickly detect a short-circuit in a detector or a line break in the detection line, but at the same time, at least all detectors that follow the fault point from the control center, so are not functional for a long time until the fault has been remedied.
  • the entire reporting line will be out of operation for so long. If such damage occurs at the weekend or at night, it can take some time before the alarm line is fully functional again. Eventually, the entire detection line loses its function if an error occurs in the line control circuit causing the interrogation.
  • the invention has for its object to design a hazard alarm system of the type mentioned in such a way that a detection line remains largely functional even if there is a fault in one of the detectors or a line interruption at the detection line, and that a large number of Detectors can be monitored.
  • both ends of the detection line are connected to the line control circuit in such a way that the detection line can be operated optionally from one and / or its other end that the detector circuit is a mode selection circuit for switching between an initialization phase and a continuous operation phase and has a line voltage interrogation circuit which causes the switch to close in the initialization phase when the line voltage changes to a first voltage level, and that the detector circuit has a detector detection circuit for storing a detector address which can be specified by the line control circuit during the initialization phase and for identifying the detector , from which a line increase was assumed during continuous operation of the detector line.
  • the solution according to the invention offers the possibility, in the event of a malfunction such as a short circuit or an interruption in the detection line, to initialize it from its two ends to the last functional detector before the faulty location and to switch to continuous operation. If the fault is just a line interruption, all detectors can be switched to work. If the fault is in a detector, all detectors are functional except for the faulty one.
  • the initialization of the alarm system according to the invention is carried out as follows. First, similar to the known hazard alarm system, a first voltage signal causes all switches in the detectors to be opened and the operating mode selection circuits to be switched to the state corresponding to the initialization phase.
  • a periodic change in voltage to the voltage level at which the line voltage interrogation circuit responds closes the switch in the detectors one after the other.
  • the quiescent current of the line is monitored in the line control circuit. If a short-circuit is found in one of the detectors or on the line, the status of the counter, which counts the detectors that are switched through correctly, is saved in the line control circuit.
  • the initialization phase is then repeated, but in the case of the detector corresponding to the stored value, ie the last functional detector before the fault, the voltage is not set to the voltage level required to actuate the switch, so that switching on to this detector does not take place.
  • the detection line is ended at this detector and will be permanently changed in which the detectors send an alarm signal, usually in the form of a line current increase, without any queries.
  • the same procedure is then used to initialize the detection line from the other end to the last functioning detector in front of the fault point and to switch it to continuous operation. This means that the alarm line is largely functional even in the event of a fault.
  • the switches in the detectors are each formed by two MOS field effect transistors which are connected in series in such a way that their parasitic drain-source diodes are directed in opposite directions.
  • one of the field effect transistors always blocks, regardless of which end of the detection line the line voltage is applied to.
  • a large number of detection lines can be monitored in the hazard detection system according to the invention without great effort, since the individual detectors do not have to be polled cyclically one after the other. If one of the line control circuits detects an alarm signal, for example a line current increase, on a detection line, however, the detector who gave the alarm signal is not yet known. To do this, it is necessary to interrogate the detectors and determine who is responsible for the alarm signal.
  • an alarm signal for example a line current increase
  • Detector detection systems are already known in the prior art, but they are all based on the fact that the detectors in the respective detection line are assigned a fixed identifier. This not only complicates the replacement of a detector, but above all a restructuring of the detector line, since the identifiers of the existing detectors may then have to be changed. This difficulty is eliminated in the hazard detection system according to the invention in that the detectors are assigned the respective identifier or address only during the initialization phase. The address assignment therefore always takes into account the current structure of the hazard detection system.
  • the detector detection circuit for storing the detector address and for identifying the alarm device comprises a second line voltage interrogation circuit which responds to a second voltage level when the line voltage changes, a detector address counter which can be switched by an output signal of the second line voltage interrogation circuit and which can be switched on by the mode selector circuit signal which characterizes the continuous operation.
  • a current counter which can be activated by the continuous operating signal of the operating mode selection circuit and can be advanced by an output signal of the second line voltage interrogation circuit, and a first comparator which compares the counter readings of the detector address counter and the current counter, which, when the counter readings match, gives an enable signal to an output circuit which is connected to a measured value memory is and causes a line current change when there is a measured value and an enable signal.
  • the detector address counter counts one step further each time the line voltage changes to the first voltage level. If you switch to continuous operation after the initialization phase, the detector address counter is blocked.
  • Each detector address counter thus contains a value corresponding to its position in the detection line, the detector closest to the line control circuit having the highest address.
  • the current counters of all detectors are incremented by periodically changing the voltage, whereby only the detector can give a response to which the The counter readings of the detector address counter and the current counter match and at which a measured value is stored in the measured value memory.
  • the detector circuit has one can be activated by the continuous operating signal of the operating mode selection circuit and by an output signal of the second line voltage Interrogation circuit switchable pulse counter and a comparator which, if the pulse counter reading corresponds to a predetermined value, gives an enable signal to the output circuit which, depending on this enable signal, an enable signal of the first comparator and a detector status signal corresponding to the predetermined count value, causes a line current change, the current counter can only be advanced when the pulse counter reaches a predetermined end value.
  • each query pulse corresponding to a counting step of the current counter can be broken down into individual pulses which are counted by the pulse counter and which each trigger a specific individual query in the detector concerned or which determine an interval in which a control signal can be output to the detector .
  • 10 is a control center of a hazard alarm system, for example a fire alarm system.
  • a number of line control circuits 12 are connected to the control center, two of which are indicated in FIG. 1.
  • Each line control circuit 12 controls a detection line 14, which consists of two lines 16 and 18, the two ends of which are each connected to the line control circuit 12 and between which a plurality of detectors 20 are connected in parallel to one another.
  • the detection line 14 is thus connected to a ring line in such a way that it can be controlled from both sides by the line control circuit 12.
  • At least one of the lines 16 and 18, in the present case the line 16 can be interrupted by a switch 22 within each detector 20. During an initialization phase, these switches 22 are successively closed by suitable control signals from the line control circuit 12.
  • each detector 20 is assigned an address.
  • the detectors are switched to a stationary operating phase in which the line control circuit only monitors the quiescent current on the detection line 14. If one of the detectors responds, this leads to a change in the line current. Subsequently, the detection line 14 is queried by the line control circuit 12 to determine which of the detectors 20 has responded.
  • the above-mentioned switch 22 consists of two MOS field-effect transistors 24 and 26 which are connected in series in the line 16 of the detection line 14 in such a way that their structure-related parasitic drain-source diodes 28 and 30 are opposed to one another. This is ensured that one of the transistors 24 and 26 always blocks, regardless of whether the line voltage is applied at one end or at the other end of the detection line 14, that is to say at terminals 16 1 and 18 1 or terminals 16 2 and 18 2 .
  • a capacitor 34 is first charged via a diode 32, which supplies the transducer 36 and the detector circuit of the detector 20 when the line voltage is briefly reduced or completely switched off for the transmission of control signals.
  • the detector circuit comprises a first line voltage interrogation circuit 38, which responds to a first voltage level which differs from the operating voltage UB, in the present case 0V and, when the line voltage is switched off, outputs an output signal via an AND gate 40 to a switch-on register 42, which in turn provides the two transistors 24 and 26 turns on.
  • the other input of the AND gate 40 is connected to an operating mode selection circuit 44 which can be switched over between an initialization phase and a continuous operating phase. The switchover from the initialization phase to the continuous operating phase takes place when the operating voltage has been maintained for a time determined by a timer 46.
  • the line voltage is also interrogated by a second line voltage interrogation circuit 48, which responds when the line voltage drops below a second voltage level lying between the operating voltage and the first voltage level.
  • the output signal of the line voltage interrogation circuit 48 is fed via an AND gate 50 to a detector address counter 52, which is incremented by one each time, in addition to the output signal the line voltage interrogation circuit also receives an enable signal from the operating mode selection circuit 44 at the other input of the AND gate 50.
  • the detector address counter 52 can only be switched on during the initialization phase. In the continuous operating phase, it is blocked by a corresponding signal from the operating mode selection circuit 44.
  • the output signal of the line voltage interrogation circuit 48 is also fed via an AND gate 54 to a detector interval or pulse counter 56, the meaning and function of which is explained in more detail below and which can advance a current counter 58.
  • the outputs of the detector address counter 52 and the current counter 58 are connected to a first comparator 60 which, when the two counters 52 and 58 are equal, controls an output circuit 66 or 68 via a logic element 62 or 64, which in turn changes the line current, can cause a current increase in the present case.
  • the output circuit 66 is activated when the operating voltage is present, while the output circuit 68 is activated when the voltage drops to the second voltage level, as is to be indicated by the signal inputs 70 and 72 of the logic elements 62 and 64. If the line current is increased by the output circuit 66, a light-emitting diode 74 is simultaneously switched on as an optical display.
  • the output of the transducer 36 is connected to a measured value memory 76, which in turn is connected on the one hand directly to the output circuits 66 and 68 and on the other hand is connected to a second comparator 78. This is via another input with the pulse counter 56 connected.
  • the comparator 78 links the individual pulse intervals with input signals which are present at its inputs during the pulse intervals. This can either be an alarm signal from the alarm register or some other disturbance variable that is supplied via input 80.
  • the operating voltage In order to put all components of the detector circuit into a defined initial state with which the initialization phase can begin, the operating voltage must be at least 100 ms for a time t1. turned off. The operating voltage is then applied again and during a time t2 of approximately 20 msec. up to 30 msec maintained. Then the line voltage is again for a time t3 of approximately 1 msec. up to a maximum of 30 msec. lowered to 0V (Fig. 3). The line voltage interrogation circuit 38 responds and activates the switch-on register 42, which turns the two transistors 24 and 26 on, since at the same time it also contains the release signal corresponding to the initialization phase from the operating mode selection circuit 44.
  • the line voltage query circuit 48 has also responded and advanced the detector address counter 52 by one.
  • the line voltage is now also present at the second detector, in which the process described above is repeated, first detector also the detector address counter 52 is incremented again by one. If all detectors are connected to the line control circuit 12 in this way, the detector address counter 52 of the detector addressed first has the highest value, while the detector address counter of the detector addressed last has the value 1.
  • the line voltage for a time t4 of, for example, at least 100 msec. kept on operating voltage.
  • the timer 46 responds and causes the mode selector circuit 44 to switch to continuous operation.
  • a corresponding output signal of the operating mode selection circuit 44 blocks the switch-on register 42 and the detector address counter 52 while the pulse counter 56 is enabled.
  • the line control circuit determines whether there is a short circuit in one of the detectors or between two detectors. If there is a short circuit in one of the detectors or between two detectors, this is determined by the line control circuit on the basis of the changed quiescent current. Furthermore, by querying the voltage at the end of the line after a certain number of initialization steps, it can be determined whether there is an open circuit or not. If such a fault is found, the line control circuit stores the position of the last detector before the fault occurred. The position of this detector is determined by the status of the counter in the line control circuit by counting the activated detectors. The line control circuit then repeats the entire initialization process up to the detector corresponding to the stored position value. After the operating voltage is applied to this detector, the voltage is not reduced to 0V but only to 5V.
  • the line voltage query scarf speaks 38 not on, so that switching to the next detector is omitted.
  • the line voltage query circuit 48 responds and increments the detector address counter 52 by one value. The operating voltage is then applied for the time t4, so that the operating mode selection circuit 44 is switched over to continuous operation.
  • the entire initialization process is now restarted from the other end of the detection line and is carried out again until the fault occurs and is then repeated in the manner described above. This means that the entire detection line is ready for operation with the exception of one detector in which the fault occurred.
  • the line control circuit 12 begins to interrogate the detection line in order to determine the detector from which the alarm signal originated. For this purpose, each detector is assigned a pulse train of six individual pulses in the present example (Fig. 5). The operating voltage is periodically reduced from 12V to 5V. Each time the line voltage is lowered, the line voltage sensing circuit 48 responds and increments the pulse counter 56 by one. With the first lowering of the voltage, the current counter 58 is also increased by one.
  • the line current increase when the detector is queried, the line current increase must be switched off in order to then be able to register a signal from the detector from which the alarm signal originally originated.
  • the line current increase is switched off by the output circuit 66 each time the voltage is reduced to 5V. If the query is ended and there is an alarm signal from the transducer, the LED 74 is switched on again after a time determined by a timer 82 after the operating voltage has been applied.
  • the detector circuit can contain a further timer which ensures that after the application of the operating voltage for the period of time determined by the timer, the switch 22 automatically closes to the next detector. In this case, however, it is not possible to query the detectors individually.

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)
  • Burglar Alarm Systems (AREA)
EP87106112A 1986-04-30 1987-04-28 Système de signalisation des risques Withdrawn EP0243928A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3614692 1986-04-30
DE19863614692 DE3614692A1 (de) 1986-04-30 1986-04-30 Gefahrenmeldeanlage

Publications (2)

Publication Number Publication Date
EP0243928A2 true EP0243928A2 (fr) 1987-11-04
EP0243928A3 EP0243928A3 (fr) 1989-02-08

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EP87106112A Withdrawn EP0243928A3 (fr) 1986-04-30 1987-04-28 Système de signalisation des risques

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EP (1) EP0243928A3 (fr)
DE (1) DE3614692A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0468097A2 (fr) * 1990-07-26 1992-01-29 Siemens Aktiengesellschaft Dispositif pour signaler les risques
US7647439B2 (en) 2005-08-05 2010-01-12 Novar Gmbh Electronic Warning System

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3806993A1 (de) * 1988-03-03 1989-09-14 Preussag Ag Feuerschutz Gefahrenmeldesystem
DE4326487C2 (de) * 1992-09-16 1995-02-09 Konrad Michael Dipl Ing Weigl Adaptives Filter
DE4322841C2 (de) * 1993-07-08 1996-02-15 Zettler Gmbh Gefahrenmeldeanlage
DE10051329C2 (de) † 2000-10-10 2003-12-11 Job Lizenz Gmbh & Co Kg Gefahrenmeldeanlage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2641489A1 (de) * 1976-09-15 1978-03-16 Siemens Ag Verfahren zur uebertragung unterschiedlicher analoger messwerte an eine zentrale von mehreren kettenfoermig an einer meldelinie liegenden brandmeldern
EP0042501A1 (fr) * 1980-06-23 1981-12-30 Cerberus Ag Dispositif pour la transmission des valeurs mesurées dans un système d'avertissement d'incendie
EP0093872A1 (fr) * 1982-04-28 1983-11-16 Cerberus Ag Procédé pour la transmission de valeurs mesurées dans un système de contrôle
EP0191239A1 (fr) * 1984-12-18 1986-08-20 Gent Limited Système de transmission d'information

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1556061A (en) * 1975-08-28 1979-11-21 Sumitomo Chemical Co Monitor and alarm apparatus in loop line system
DE2836760C2 (de) * 1978-08-23 1983-11-17 Dr. Alfred Ristow GmbH & Co, 7500 Karlsruhe Elektronisches Fernüberwachungssystem
CA1178678A (fr) * 1981-03-13 1984-11-27 John M. Wynne Systeme bidirectionnel de detection d'incendie

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2641489A1 (de) * 1976-09-15 1978-03-16 Siemens Ag Verfahren zur uebertragung unterschiedlicher analoger messwerte an eine zentrale von mehreren kettenfoermig an einer meldelinie liegenden brandmeldern
EP0042501A1 (fr) * 1980-06-23 1981-12-30 Cerberus Ag Dispositif pour la transmission des valeurs mesurées dans un système d'avertissement d'incendie
EP0093872A1 (fr) * 1982-04-28 1983-11-16 Cerberus Ag Procédé pour la transmission de valeurs mesurées dans un système de contrôle
EP0191239A1 (fr) * 1984-12-18 1986-08-20 Gent Limited Système de transmission d'information

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0468097A2 (fr) * 1990-07-26 1992-01-29 Siemens Aktiengesellschaft Dispositif pour signaler les risques
EP0468097A3 (en) * 1990-07-26 1993-02-03 Siemens Aktiengesellschaft Danger signal appliance
US7647439B2 (en) 2005-08-05 2010-01-12 Novar Gmbh Electronic Warning System

Also Published As

Publication number Publication date
EP0243928A3 (fr) 1989-02-08
DE3614692C2 (fr) 1989-02-16
DE3614692A1 (de) 1987-11-05

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