EP2169645B1 - Contrôle des lignes d'alerte d'une installation d'alerte au danger - Google Patents

Contrôle des lignes d'alerte d'une installation d'alerte au danger Download PDF

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Publication number
EP2169645B1
EP2169645B1 EP09007163A EP09007163A EP2169645B1 EP 2169645 B1 EP2169645 B1 EP 2169645B1 EP 09007163 A EP09007163 A EP 09007163A EP 09007163 A EP09007163 A EP 09007163A EP 2169645 B1 EP2169645 B1 EP 2169645B1
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Prior art keywords
current
line
voltage
terminal module
test
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EP09007163A
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German (de)
English (en)
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EP2169645A1 (fr
Inventor
Sebastian Rijkers
Heiner Politze
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Novar GmbH
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Novar GmbH
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    • 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
    • G08B29/12—Checking intermittently signalling or alarm systems
    • G08B29/123—Checking intermittently signalling or alarm systems of line circuits

Definitions

  • the invention relates to a method for testing a signal line fed with a constant line voltage with n detectors (n ⁇ 1) of an alarm system at rest on inadmissibly high line resistance (Rx) by measuring the current of the completed with an end module detection line, comparison with a setpoint and generation an error message when the setpoint is not reached.
  • the invention further relates to a hazard alarm system which is set up to carry out this test method, namely a system with at least one control center, to which at least one reporting line with n detectors (n ⁇ 1) is connected and which is terminated with an end module, around the reporting line to check for errors due to impermissibly high resistance (Rx) of the signaling line and to generate a signal "Fault" in the event of an error.
  • a hazard alarm system which is set up to carry out this test method, namely a system with at least one control center, to which at least one reporting line with n detectors (n ⁇ 1) is connected and which is terminated with an end module, around the reporting line to check for errors due to impermissibly high resistance (Rx) of the signaling line and to generate a signal "Fault" in the event of an error.
  • Alarm systems have long been designed so that the signal lines connected directly or indirectly to the alarm control panel, in the following "control panel", can be monitored for interruption and short circuit.
  • Common practice is the quiescent current monitoring, in which the respective detection line with a resistance of z. B. 10k ⁇ is completed.
  • the control panel or coupler measures the quiescent current on the relevant detector line and compares it with a tolerance field in which the measured current must take into account the line resistance, the number of connected detectors and their respective quiescent current and the terminating resistor. Too low power is considered inadmissible high series resistance, in extreme cases as an interruption, too high a current as unacceptably low parallel resistance, in extreme cases interpreted as a short circuit.
  • a line for feeding z. B. from signalers or other low-impedance consumers (actuators) of a security system to monitor so-called creeping interruption and so-called creeping short circuit.
  • the line with a non-linear element for. B. a thermistor, a diode or a voltage-controlled transistor in series with a resistor and is operated to test with respect to the triggering of the signal generator (or other actuators) reverse polarity and different, impressed currents.
  • the respectively set voltage at the beginning of the line is compared with reference values. As a result, the comparison provides whether the line is in a proper or faulty state.
  • a similar monitoring method for a line that feeds at least one alarm device of a hazard alarm system is known from DE-A-10 2005 060 123 known.
  • the line with a low-resistance element for. B. a diode or a diode in series with a Zener diode, which locks in the current flow direction in which the alarm device is activated blocks.
  • a similar nonlinear element is connected in parallel with each alarm device.
  • the line is operated with reverse polarity and different impressed currents, from which, in conjunction with the respective voltages at the beginning of the line, the line resistance is calculated and compared with a setpoint range.
  • test is done in accordance with the regulations that, to determine a creeping interruption, an adjustable series resistance (potentiometer) in the line of the signaling line is increased until the alarm system detects a break in the signal line that the total resistance of the line at which this condition occurs is measured , then reduced by 10% and then determined whether the reporting line is functional again.
  • an adjustable series resistance potentiometer
  • the invention has for its object to provide a method and a hazard detection system available, which determine according to these requirements, whether the reporting line is operational.
  • this object is achieved according to the invention by that by means of the end module periodically during a test time a test current which is at least equal to the current of a detector in the alarm state, is generated on the reporting line.
  • the core idea of the invention is thus to replace the previous monitoring of the value of a constantly flowing quiescent current by the monitoring of a current flowing only briefly, compared to the previous quiescent current value high test current. It is therefore checked whether the condition of the aforementioned standard is satisfied that the transmission path, i. the relevant reporting line, even at its end provides a voltage at which the functionality of the last seen from the center of the detector is still ensured.
  • the functionality of a detector is understood to mean that the detector in the event of a detected hazard, e.g. a fire, an alarm current generated on the reporting line, which is many times higher than the quiescent current on the affected reporting line.
  • the method proposed by the invention is therefore synonymous with a test of the detection line to unacceptably high resistance under load conditions.
  • test time is short, e.g. between 10 ms and 30 ms, and the repetition of the check of the reporting line at long intervals, e.g. in the range of 10 s to 100 s, the power consumption is low.
  • the method is therefore not at the expense of the prescribed emergency operating time of the alarm system.
  • the test current generated by means of the end module could be triggered by a coded command transmitted to the end module via the reporting line.
  • Much easier and therefore preferred is to trigger the generation of the test current by means of the end module by interrupting and reconnecting the line voltage for a time tolerated by the detectors.
  • Most detectors exploited, for reasons of noise immunity and large fluctuations in the line voltage including a loss of line voltage for a short time, for example, up to a few hundred milliseconds to tolerate and only switch off at a longer interruption of the line voltage to re-line voltage on the return initialize.
  • An improvement of the proposed method is to generate the test current only when the voltage applied to the end module voltage is higher than a predetermined minimum value.
  • This minimum value is preferably equal to the minimum operating voltage of the detectors connected to the signal line, plus a small tolerance value.
  • the signaling line line has a resistance in which at the end module while at rest, a voltage between the voltage at the beginning of the line and the minimum operating voltage of the connected detector is applied, but this voltage when the test current due to the line resistance under the minimum value falls and consequently the test current is not generated or only for a very short time.
  • the control panel or coupler detects in this case that the test current at least not during the entire test time exists and therefore generates an error message.
  • the test current generated by a detector in the alarm state initially increases approximately proportional to the voltage with increasing line voltage, but is limited to a constant value from a given line voltage for reasons of limiting the power consumption, the test current is preferably generated limited current.
  • the object mentioned in the present invention is achieved in that the end module comprises a timer which is started by applying the line voltage and controls a constant current circuit which generates a test current which is at least equal to the current of a Detector is in alarm.
  • the control center or coupler, to which the signaling line is connected comprises for this purpose a controlling software which is provided by periodically interrupting the line voltage for e.g. a few milliseconds periodically starts the timer of the end module and then checks whether the test current is present at the predetermined level and during a predetermined test time.
  • the test time may e.g. between 10 ms and 100 ms.
  • the end module has a voltage monitoring, which shuts off the end module falls below a minimum voltage.
  • This voltage monitoring can be very easily done e.g. be realized by a lying in the current path of the constant current circuit zener diode with a suitable zener voltage.
  • the reporting line terminating resistor has the value customary in an existing security system, ie it is e.g. 10k.
  • the end module is also suitable for the extension of an existing alarm system that performs only the conventional closed circuit current monitoring, so can not make use of the functionality of the proposed end module. Consequently, the installer or operator of the alarm system does not have to pay attention to the embodiment of the end module when it is being expanded.
  • the invention is applicable both in systems in which at least one coupler is connected to a central office via a communication bus, to which in turn at least one reporting line is connected, as well as in the rarer case that one or more reporting lines are connected directly to the control center.
  • the two-wire reporting line in FIG. 1 in the following also briefly "line”, comprises a detector M and a terminating resistor R1, which is very often equal to 10k ⁇ .
  • FIG. 1 as the end of a reporting line with numerous other, parallel to the detector M. and not shown detectors or as a reporting line with only a single detector M, which is connected directly to a central office or a coupler, are considered.
  • a potentiometer RL is looped into the signal line in order to simulate the test conditions prescribed by the DIN EN54 Part 13 mentioned above for a creeping interruption of the signal line.
  • this detector line In the normal operating state, ie without the potentiometer RL, this detector line has a quiescent current of approximately 900 ⁇ A plus the quiescent current of the detector M of, for example, an assumed line voltage of 9.4V. 20pA, with n detectors plus n * 20 ⁇ A.
  • Such detectors have an operating voltage range of e.g. 4V to over 12V.
  • the detectors usually switch off automatically when they fall below the lower operating voltage limit and re-initialize when this minimum operating voltage is exceeded.
  • the alarm current may e.g. be about 3mA at the lowest operating voltage, increase with increasing operating voltage, and are circuitically switched to a maximum value of e.g. 8mA be limited from 7V.
  • an end module which is used to test the total resistance of the signal line, ie the two-wire line in FIG. 1 , but temporarily a detector such as the detector M in FIG. 1 simulated.
  • the end module also works with the circuit according to FIG FIG.
  • test current is designed so that it generates no current during the test time when the voltage at its input is less than the minimum detector operating voltage. If detectors are operated on the same reporting line, the minimum operating voltage is different, the voltage at which the end module no longer generates power, of course, adapted to the highest, minimum required operating voltage.
  • the circuit in FIG. 2 has a rest state and a working state in which it generates the test current. At rest, the circuit assumes a quiescent current at a line voltage at its input, which is higher than the above minimum voltage, which is considerably smaller than the minimum alarm current of a detector. To put the circuit in the working state, the coupler (or the control panel) interrupts the line voltage for a short time interval, eg for 4 ms. Normally, the detectors connected to the line are in the idle state and tolerate this voltage interruption because they internally draw their operating voltage from a buffer capacitor during this time.
  • a short time interval eg for 4 ms.
  • the circuit has a timer at the input.
  • a time determining capacitor C11 has discharged across R51, R28 and R32.
  • the discharge time can be paralleled by a reverse direction C11 switched diode can be shortened, in particular in conjunction with the later explained resistor R52.
  • C11 holds the PNP transistor Q29 in the off state via R51. Therefore, the NPN transistor Q19 is in the off state. Consequently, the NPN transistors Q23 and Q24 conduct, which together with the resistors R25 and R26 form a constant current source.
  • This is designed so that it has a current consumption which is at least equal to the minimum alarm current of a detector M, but preferably twice, ie for example about 9 mA, provided that the voltage applied to the input of the circuit line voltage is greater than a minimum voltage.
  • This is determined by a zener diode D11 in the collector branch of Q23 and a normal diode D16 connected in series for temperature compensation. Consequently, if D11 has a zener voltage of 5.1V and D16 has a forward voltage of 0.6V, the circuit operates only at input voltages higher than about 6V.
  • the central office (or coupler) periodically initiates the described test, e.g. in a bar between one second and one minute.
  • the circuit can optionally have a parallel resistor R52 of 10k ⁇ at the input. This resistance only has the function of making the final module compatible with the use of an additional quiescent current consumption when used in a standard system even for a system that still with a simple quiescent current test according to FIG. 1 is working.
  • FIG. 3 illustrated current / voltage curve.
  • the end module supplies a current pulse of 9 mA in this example during a time of approximately 25 ms determined primarily by C11 and R32, followed by a quiescent current of approximately 1.3 mA (of which approximately 900 pA by R52 conditional). Setting the test current pulse to 9 mA ensures that the detector line supplies the detectors with sufficient operating voltage even if two detectors have gone into alarm simultaneously or in succession.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
  • Fire Alarms (AREA)

Claims (10)

  1. Procédé pour vérifier au repos une ligne de détection à n détecteurs (n ≥ 1) d'une installation de détection de danger, alimentée sous une tension de ligne constante, pour détecter une résistance (RL) excessivement élevée par mesure de l'intensité de la ligne de détection terminée par un module de terminaison, comparaison avec une valeur de consigne et génération d'un message d'erreur si la valeur est inférieure à la consigne, caractérisé en ce que le module de terminaison génère périodiquement sur la ligne de détection, pendant un intervalle de temps d'essai, un courant d'essai qui est au moins égal au courant d'un détecteur en état d'alarme.
  2. Procédé selon la revendication 1, caractérisé en ce que la génération du courant d'essai au moyen du module de terminaison est déclenchée par l'interruption et le rétablissement de la tension de la ligne pendant un intervalle de temps toléré par les détecteurs.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le courant d'essai n'est émis que quand la tension appliquée au module de terminaison est supérieure à une valeur minimale prédéterminée.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le courant d'essai est produit avec une intensité limitée.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le courant d'essai est mesuré au moins deux fois pendant l'intervalle de temps d'essai et comparé à la valeur de consigne.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que l'intervalle de temps d'essai est plus court que le temps pendant lequel un détecteur doit être dans l'état d'alarme pour déclencher une alarme.
  7. Installation de détection de danger avec un central auquel est connectée au moins une ligne de détection à n détecteurs (n ≥ 1), terminée par un module de terminaison pour tester la ligne de détection afin de détecter les défauts liés à une résistance (Rx) excessive de la ligne de détection et produire en cas de défaut un signal « anomalie », en particulier pour la mise en oeuvre du procédé selon l'une des revendications 1 à 6, caractérisé en ce que le module de terminaison comprend un élément temporisateur (Q29, C11, R32, R31, R51) qui est activé par l'application de la tension de ligne et commande un circuit à courant constant (Q23, Q24, R25, R26) produisant un courant d'essai qui est au moins égal au courant d'un détecteur dans l'état d'alarme.
  8. Installation de détection de danger selon la revendication 7, caractérisée en ce que le module de terminaison comprend une surveillance de la tension (D11, D16) qui désactive le module de terminaison si la tension n'atteint pas un niveau minimum.
  9. Installation de détection de danger selon la revendication 7 ou 8, caractérisée en ce qu'un shunt de protection contre les erreurs de polarité est prévu à l'entrée du module de terminaison.
  10. Installation de détection de danger selon l'une des revendications 7 à 9, caractérisée en ce qu'une résistance de terminaison de la ligne de détection (R52) est placée entre les connexions d'entrée du module de terminaison.
EP09007163A 2008-09-25 2009-05-28 Contrôle des lignes d'alerte d'une installation d'alerte au danger Active EP2169645B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008048930A DE102008048930B4 (de) 2008-09-25 2008-09-25 Prüfung der Meldelinien einer Gefahrenmeldeanlage

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EP2169645A1 EP2169645A1 (fr) 2010-03-31
EP2169645B1 true EP2169645B1 (fr) 2011-05-11

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AT (1) ATE509334T1 (fr)
DE (1) DE102008048930B4 (fr)
ES (1) ES2362822T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11328580B2 (en) 2018-05-29 2022-05-10 Autronica Fire & Security As Testing of a network of hazard warning devices

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2701132B1 (fr) * 2012-08-23 2018-07-04 Novar GmbH Dispositif d'alarme comprenant une unité de stockage d'énergie local et système d'alarme basé sur le bus
FR3001320B1 (fr) * 2013-01-21 2016-05-27 Securites Systemes Sessy Procede de surveillance d'une liaison cablee par mesure de resistance serie, et unite de controle et de surveillance ecs mettant en oeuvre ce procede
EP3748599B1 (fr) * 2019-06-03 2021-07-28 Siemens Schweiz AG Procédé pour opérer et tester un système de signalisation de danger avec un système de bus, détecteurs pour connexion à un système de bus et système de signalisation de danger avec un système de bus.

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
US2684475A (en) * 1952-06-26 1954-07-20 Gen Sonics Corp Supervised signaling system
GB910920A (en) * 1960-06-21 1962-11-21 Pyrene Co Ltd Improvements in or relating to fire-detection circuits
CH581363A5 (en) * 1974-11-18 1976-10-29 Nohmi Bosai Kogyo Co Ltd Fire alarm network with parallel detectors - has detectors connected via common lines to central control
JP2721916B2 (ja) * 1989-06-29 1998-03-04 能美防災株式会社 火災報知設備の断線監視装置
GB2286735B (en) * 1994-02-05 1998-03-04 Thorn Security A monitoring system
AT501215B1 (de) 2004-12-20 2008-05-15 Friedl Helmut Dipl Ing Überwachungseinrichtung
EP1777671A1 (fr) 2005-10-19 2007-04-25 Honeywell International, Inc. Surveiller le câblage d'un système d'alarme

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11328580B2 (en) 2018-05-29 2022-05-10 Autronica Fire & Security As Testing of a network of hazard warning devices

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Publication number Publication date
EP2169645A1 (fr) 2010-03-31
DE102008048930B4 (de) 2011-04-07
ATE509334T1 (de) 2011-05-15
DE102008048930A1 (de) 2010-04-08
ES2362822T3 (es) 2011-07-13

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