EP0167669B1 - Method of and device for identifying an alarm triggering sensor in a danger signalling device - Google Patents

Method of and device for identifying an alarm triggering sensor in a danger signalling device Download PDF

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Publication number
EP0167669B1
EP0167669B1 EP84115075A EP84115075A EP0167669B1 EP 0167669 B1 EP0167669 B1 EP 0167669B1 EP 84115075 A EP84115075 A EP 84115075A EP 84115075 A EP84115075 A EP 84115075A EP 0167669 B1 EP0167669 B1 EP 0167669B1
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EP
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Prior art keywords
alarm
circuit
current limiting
current
sensor
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German (de)
French (fr)
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EP0167669A1 (en
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Patrik Dipl.-Ing. Jakob (Fh)
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Siemens AG
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Siemens AG
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/04—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using a single signalling line, e.g. in a closed loop

Definitions

  • the invention relates to a method for identifying an alarm-triggering detector in a hazard alarm system according to the preamble of claim 1 and to an arrangement for performing this method.
  • EP-A-0 093 095 discloses a method and a device for identifying an alarm signaling device and a reporting line. There, in the event of an alarm, a voltage change is brought about on the detection line and, on the basis of a signal emitted by a line unit, the alarm-triggering detector is then prompted to transmit its coded address in the form of binary-coded pulses. From this document it can only be seen that an alarm-triggering detector causes a voltage change in the line voltage and a line unit then sends a signal to the detection line by means of a signal generator that can be controlled by a voltage decoder, which causes a generator and a memory in the alarm-triggering detector to send a pulse telegram to the line unit transfer. The pulse telegram is superimposed on the increased line voltage. In the line unit, the relevant detector is determined from this pulse telegram in the voltage decoder circuit and transmitted via a separate line to the downstream control center for display there.
  • a detector circuit is only activated from the control center in the event of an alarm. This then transmits the number of the alarming sensor to the control center.
  • the line current is raised from its quiescent current limit value to an alarm current limit value.
  • a current limiting circuit arranged in the detector activates the coding device arranged there because the current value of the response threshold has been exceeded.
  • the coding set in the detector is transmitted to the control center using binary-coded pulses. In the control center, the binary-coded pulses are decoded and the alarm-triggering detector is displayed.
  • the detector coding can expediently be transmitted by means of pulse width modulation.
  • the coding device in the detector has an encodable decadal counter, which is followed by a square-wave generator, which can be formed, for example, by an operational amplifier.
  • a switchable current limiting circuit is correspondingly provided in the control center, which limits the line current to a quiescent current limit value when at rest and increases the line current to an alarm current limit value in the event of an alarm.
  • the current limiting circuit in the control center is followed by an evaluation circuit that monitors the signal states of the signal line and compares them with predefinable reference voltages and controls a downstream decoding display logic according to the respective signal states, which in the event of an alarm controls the switchable current limiting circuit to increase the line current and the display device Activates the display of the alarm-triggering detector.
  • FIG. 1 shows the basic circuit of a detector M, to which the line voltage U is supplied via the conductors a and b.
  • the current limiting circuit MSB In series with the sensor S, which has a high resistance in the idle state and which, in the event of an alarm, has the characteristic of a Z diode assumes, the current limiting circuit MSB.
  • the transistor T1 At currents which lie below the response threshold IS defined by the resistor R1, the transistor T1 is blocked, while the transistor T2 is conductive.
  • the resistor R1 is dimensioned such that the quiescent current limit value IRG set on the central side is below the current value of the response threshold IS of the current limiting circuit MSB.
  • the line voltage U with the open-circuit voltage value UR is present at the detector M, while a negligibly small detector current flows in the detector and a very low closed-circuit current IR flows in the closed-circuit current-monitored signal line.
  • the line current 1 limited to the idle current limit value IRG flows through the low-resistance sensor S, so that the line voltage U drops with the idle voltage value UR to the alarm voltage value UAL.
  • the line current limitation USB in the control center (Z) is switched from the quiescent current limit value IRG to a higher alarm current limit value IAL at time t2 in FIG. 2.
  • the switchable current limiting circuit USB in the center (Z) and the evaluation circuit AWS is shown in Fig. 3 and will be explained in more detail later.
  • Increasing the line current 1 to the alarm current limit value IAL has the result that the current limiting circuit MSB is activated in the detector, which initially limited the detector current to the current value of the response threshold IS.
  • the transistor T1 With the increased current value on the signal line, the transistor T1 now becomes conductive and supplies the coding device COD, which in the present exemplary embodiment has a pulse shaper stage, via a voltage regulator RS.
  • the coding device COD consists of a decade counter DZ and an operational amplifier OV connected as a square wave generator, which is supplied with the supply voltage US from the voltage regulator SR.
  • the decade counter DZ receives a reset pulse at the reset input R of the decade counter DZ via the RC combination C1, R2.
  • all outputs Q1 to Q (n + 1) of the decadal counter DZ LOW.
  • the square-wave pulses generated by the operational amplifier OV cause with each falling edge at the clock input CL of the decadal counter DZ at the outputs Q1 to Q (n + 1) that in turn only one output is HIGH.
  • Each LOW state of the operational amplifier OV results in an increase in the detector current to the current value IP via the resistor R3. This is the current value of the binary coded detector signals, which are received as current pulses in the control center.
  • a HIGH level at the sum point SP extends the duration of the current pulse.
  • the length of a current pulse is set with the coding switches S1 to Sn, a closed switch giving a long pulse, corresponding to a logical one, and an open switch giving a short pulse corresponding to a logical zero.
  • an n-bit serial pulse telegram is created, which can contain further information in addition to the binary-coded detector number.
  • This pulse telegram can be decoded in the control center using the evaluation circuit described later and the corresponding message number can be displayed.
  • This pulse telegram is shown in Fig. 2b for the detector with the binary number 1010.
  • 2a shows the voltage curve over time.
  • the output Q (n + 1) of the decadal counter DZ becomes HIGH and stops the clock generator OV via diode D, the output of which until the end of the central line current increase (at time t4 in FIG. 2b) remains in the LOW state and controls the detector display MA via the resistor R3.
  • the line voltage U is on the signal line ML with the two wires a and b.
  • the idle current limit value IR is set with the resistor R4, and with the transistor T4 switched on, the alarm current limit value IAL is set with the parallel connection of the resistors R4 and R5.
  • the switchable current limiting circuit USB is followed by an evaluation circuit AWS. This has three comparators K1 to K3 and a timing element R6, C2. The comparator K1 switches when the alarm criterion (alarm voltage value UAL) occurs on the detection line ML. For this purpose, the comparator K1 is connected to the b-wire of the ML detection line.
  • a reference voltage U1 is present at the second input of the comparator K1.
  • the output of the comparator K1 leads to the decoding and display logic DAL.
  • the second comparator K2 has its first input connected to the switchable current limiting circuit USB.
  • a reference voltage U2 is present at the second input.
  • the voltage U proportional to the line current at the resistors R4 and R5 of the switchable current limiting circuit USB is fed to the second comparator K2, which switches when the coded current pulses IP are sent by the detector (M).
  • the output signal of the comparator K2 reaches the input of the third comparator K3 via the integrator R6 C2.
  • the reference voltage U3 is present at the second input of the comparator K3.
  • the reference voltage U3 and the time constant of the integrator R6, C2 are dimensioned such that the comparator K3 switches IP (binary one) when a long pulse arrives, but does not switch IP (binary zero) when a short pulse arrives.
  • the respective output of the comparators K1 to K3 is led to the respective input E1 to E3 of the decoding and display logic DAL, which is formed, for example, by a microprocessor.
  • the decoding and display logic DAL recognizes the alarm state via input E1 (alarm voltage value UAL) the detection line ML and controls the switchable current limiting circuit USB via the output A1, which increases the line current I from the quiescent current limit value IRG to the alarm current limit value IAL.
  • the decoding and display logic DAL receives the detector telegram in the form of the binary-coded current pulses (IP), decodes it and displays the detector number via the output A2 on the display device ANZ, which can be, for example, a seven-segment display .
  • IP binary-coded current pulses

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
  • Fire Alarms (AREA)

Abstract

1. Method of identifying an alarm-triggering sensor in a danger-signalling device having several annunciation circuits (ML) connected to a control centre (Z), having several sensors (M) in each case, which are connected to each individual annunciator circuit (ML) and each have an adjustable coder (COD), and having a decoder in an evaluaction device (AWE) which is arranged in the control centre (Z), an alarm-triggering sensor (M) causing a change in voltage of the line voltage (U), and the control centre detecting an alarm annunciation of the annunciator circuit (ML) concerned and sending to the annunciator circuit (ML) a signal which causes the coder (COD) of the alarm-triggering sensor (M) to transmit the preset annunciator coding to the control centre (Z) by means of binary coded pulses (IP), the binary coded pulses (IP) being decoded, and the alarm-triggering sensor being displayed (ANZ) in the evaluation device (AWE), characterised in that in the case of an alarm in the control centre (Z) the line current (I) of the annunciator circuit (ML) is increased from a closed-circuit current limiting value (IRG) to an alarm current limiting value (IAL), and in that a response threshold (IS) of a current limiting circuit (MSB) arranged in the sensor (M) is thereby overshot, and the coder (COD) is triggered.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Identifizierung eines alarmauslösenden Melders in einer Gefahrenmeldeanlage gemäß dem Oberbegriff des Patentanspruches 1 und auf eine Anordnung zur Durchführung dieses Verfahrens.The invention relates to a method for identifying an alarm-triggering detector in a hazard alarm system according to the preamble of claim 1 and to an arrangement for performing this method.

In Gefahrenmeldeanlagen werden üblicherweise mehrere Sensoren bzw. Melder an einer Zweidrahtleitung, der Meldeleitung, betrieben. Beim Ansprechen eines Sensors verringert sich dessen Innenwiderstand, wobei wegen der zentralseitigen Strombegrenzung der Meldeleitung die Linienspannung absinkt, was in der Zentrale als Alarmkriterium ausgewertet wird. In vielen Fällen erscheint es wünschenswert, den Melder zu identifizieren, der Alarm ausgelöst hat.In hazard alarm systems, several sensors or detectors are usually operated on a two-wire line, the alarm line. When a sensor responds, its internal resistance is reduced, the line voltage falling due to the central current limitation of the signal line, which is evaluated as an alarm criterion in the control center. In many cases it seems desirable to identify the detector that triggered the alarm.

Es gibt hierfür einige Verfahren, die im wesentlichen darauf beruhen, daß von der Zentrale her durch Modulation der Linienspannung diese Sensoren einer Meldeleitung- der Reihe nach auf ihren Zustand bzw. Meßwert abgefragt werden. In der DE-OS 25 33 382 ist beispielsweise ein derartiges Verfahren beschrieben. Ein solches modernes Gefahrenmeldesystem, wie die dort beschriebene Pulsmeldetechnik, löst die Einzelidentifizierung der Melder mit speziellen Meldern und einer entsprechend ausgebildeten Zentrale. Bei solchen Verfahren können wegen des ständigen Datenflusses auf der Meldelinie leicht Störungen auftreten. Außerdem führt dieses Verfahren zu einem höheren Stromverbrauch. Bestehende Gefahrenmeldeanlagen würden eine völlige Umrüstung, die mit hohen Kosten verbunden ist, verlangen.There are some methods for this, which are essentially based on the fact that from the control center, by modulating the line voltage, these sensors are interrogated one after the other for their status or measured value. Such a method is described in DE-OS 25 33 382, for example. Such a modern hazard detection system, such as the pulse detection technology described there, solves the individual identification of the detectors with special detectors and an appropriately trained control center. With such procedures, faults can easily occur due to the constant flow of data on the detection line. This process also leads to higher power consumption. Existing alarm systems would require a complete changeover, which is associated with high costs.

Aus der EP-A-O 093 095 ist ein Verfahren und eine Einrichtung zur Identifizierung eines alarmgebenden Melders und einer Meldelinie bekannt. Dort wird im Alarmfall eine Spannungsänderung auf der Meldelinie bewirkt und dann aufgrund eines von einer Linieneinheit abgegebenen Signals der alarmauslösende Melder veranlaßt, seine codierte Adresse in Form von binärcodierten Impulsen zu übertragen. Aus diesem Dokument ist lediglich entnehmbar, daß ein alarmauslösender Melder eine Spannungsänderung der Linienspannung bewirkt und eine Linieneinheit daraufhin mittels eines von einem Spannungsdecoder ansteuerbaren Signalgenerators ein Signal auf die Meldelinie gibt, welches einen Generator und einen Speicher im alarmauslösenden Melder veranlaßt, ein Impulstelegramm zur Linieneinheit zu übertragen. Dabei ist das Pulstelegramm der erhöhten Linienspannung überlagert. In der Linieneinheit wird aus diesem Pulstelegramm in der Spannungsdecoderschaltung der betreffende Melder ermittelt und über eine eigene Leitung zur nachgeschalteten Zentrale zur dortigen Anzeige übertragen.EP-A-0 093 095 discloses a method and a device for identifying an alarm signaling device and a reporting line. There, in the event of an alarm, a voltage change is brought about on the detection line and, on the basis of a signal emitted by a line unit, the alarm-triggering detector is then prompted to transmit its coded address in the form of binary-coded pulses. From this document it can only be seen that an alarm-triggering detector causes a voltage change in the line voltage and a line unit then sends a signal to the detection line by means of a signal generator that can be controlled by a voltage decoder, which causes a generator and a memory in the alarm-triggering detector to send a pulse telegram to the line unit transfer. The pulse telegram is superimposed on the increased line voltage. In the line unit, the relevant detector is determined from this pulse telegram in the voltage decoder circuit and transmitted via a separate line to the downstream control center for display there.

Es ist Aufgabe der Erfindung, derartige Verfahren und Anordnungen dergestalt weiterzubilden, daß bei bereits bestehenden Gefahrenmeldeanlagen mit verhältnismäßig geringem Schaltungsaufwand ein alarmauslösender Melder einer Meldeleitung identifiziert und angezeigt werden kann.It is an object of the invention to further develop such methods and arrangements such that an alarm-triggering detector of a signaling line can be identified and displayed in existing hazard alarm systems with relatively little circuitry.

Diese Aufgabe wird mit dem erfindungsgemäßen Verfahren gemäß den kennzeichnenden Merkmalen des Patentanspruchs 1 gelöst. Bezüglich der Anordnung wird die Aufgabe mit den Merkmalen des Patentanspruchs 2 gelöst.This object is achieved with the method according to the invention in accordance with the characterizing features of patent claim 1. With regard to the arrangement, the object is achieved with the features of claim 2.

Mit dem erfindungsgemäßen Verfahren und den entsprechenden Einrichtungen wird eine Melderschaltung nur im Alarmfall von der Zentrale aus aktiviert. Diese überträgt dann die Nummer des alarmierenden Sensors zur Zentrale. Dabei wird im Alarmfall der Meldeleitung in der Zentrale der Linienstrom von seinem Ruhestromgrenzwert auf einen Alarmstromgrenzwert angehoben. Eine im Melder angeordnete Strombegrenzungsschaltung aktiviert die dort angeordnete Codiereinrichtung, weil der Stromwert der Ansprechschwelle überschritten wurde. Die im Melder eingestellte Codierung wird mittels binärcodierten Impulsen zur Zentrale übertragen. In der Zentrale werden in der Auswerteeinrichtung die binär codierten Impulse decodiert und der alarmauslösende Melder wird angezeigt. Die Übertragung der Meldercodierung kann zweckmäßigerweise mittels einer lmpulsbreitenmodulation erfolgen. Dazu weist die Codiereinrichtung im Melder einen codierbaren dekadischen Zähler auf, dem ein Rechteckgenerator, der beispielsweise von einem Operationsverstärker gebildet sein kann, nachgeschaltet ist. In der Zentrale ist entsprechend eine umschaltbare Strombegrenzungsschaltung vorgesehen, die bei Ruhe den Linienstrom auf einen Ruhestromgrenzwert begrenzt und im Falle eines Alarms den Linienstrom auf einen Alarmstromgrenzwert erhöht. Der Strombegrenzungsschaltung in der Zentrale ist eine Auswerteschaltung nachgeordnet, die die Signalzustände der Meldeleitung überwacht und mit vorgebbaren Referenzspannungen vergleicht und entsprechend der jeweiligen Signalzustände eine nachgeordnete Decodier-Anzeigelogik ansteuert, die im Alarmfall einerseits die umschaltbare Strombegrenzungsschaltung zur Erhöhung des Linienstroms ansteuert und andererseits die Anzeigeeinrichtung zur Anzeige des alarmauslösenden Melders ansteuert.With the method according to the invention and the corresponding devices, a detector circuit is only activated from the control center in the event of an alarm. This then transmits the number of the alarming sensor to the control center. In the event of an alarm in the alarm line in the control center, the line current is raised from its quiescent current limit value to an alarm current limit value. A current limiting circuit arranged in the detector activates the coding device arranged there because the current value of the response threshold has been exceeded. The coding set in the detector is transmitted to the control center using binary-coded pulses. In the control center, the binary-coded pulses are decoded and the alarm-triggering detector is displayed. The detector coding can expediently be transmitted by means of pulse width modulation. For this purpose, the coding device in the detector has an encodable decadal counter, which is followed by a square-wave generator, which can be formed, for example, by an operational amplifier. A switchable current limiting circuit is correspondingly provided in the control center, which limits the line current to a quiescent current limit value when at rest and increases the line current to an alarm current limit value in the event of an alarm. The current limiting circuit in the control center is followed by an evaluation circuit that monitors the signal states of the signal line and compares them with predefinable reference voltages and controls a downstream decoding display logic according to the respective signal states, which in the event of an alarm controls the switchable current limiting circuit to increase the line current and the display device Activates the display of the alarm-triggering detector.

Weitere Einzelheiten und Vorteile ergeben sich aus den Unteransprüchen.Further details and advantages result from the subclaims.

Anhand der Zeichnung wird an einem Ausführungsbeispiel die Erfindung näher erläutert. Dabei zeigen die

  • Fig. 1 ein Prinzipschaltbild eines Melders,
  • Fig. 2a und 2b den zeitlichen Spannungs- und Stromverlauf am Beispiel eines Melders mit der Nummer 10 (binär 1010), und
  • Fig. 3 ein mögliches Schaltbeispiel der Auswerteeinrichtung der Zentrale.
The invention is explained in more detail using an exemplary embodiment with reference to the drawing. The show
  • 1 is a block diagram of a detector,
  • 2a and 2b the temporal voltage and current curve using the example of a detector with the number 10 (binary 1010), and
  • Fig. 3 shows a possible circuit example of the evaluation device of the control center.

In Fig. 1 ist die Prinzipschaltung eines Melders M dargestellt, dem über die Leiter a und b die Linienspannung U zugeführt wird. In Reihe zum Sensor S, der im Ruhezustand hochohmig ist und der im Alarmfall die Charakteristik einer Z-Diode annimmt, liegt die Strombegrenzungsschaltung MSB. Bei Strömen, die unterhalb der durch den Widerstand R1 definierten Ansprechschwelle IS liegen, ist der Transistor T1 gesperrt, während der Transistor T2 leitend ist. Der Widerstand R1 ist so dimensioniert, daß der zentralseitig eingestellte Ruhestromgrenzwert IRG unterhalb dem Stromwert der Ansprechschwelle IS der Strombegrenzungsschaltung MSB liegt.1 shows the basic circuit of a detector M, to which the line voltage U is supplied via the conductors a and b. In series with the sensor S, which has a high resistance in the idle state and which, in the event of an alarm, has the characteristic of a Z diode assumes, the current limiting circuit MSB. At currents which lie below the response threshold IS defined by the resistor R1, the transistor T1 is blocked, while the transistor T2 is conductive. The resistor R1 is dimensioned such that the quiescent current limit value IRG set on the central side is below the current value of the response threshold IS of the current limiting circuit MSB.

Im Ruhezustand liegt am Melder M die Linienspannung U mit dem Ruhespannungswert UR, während im Melder ein vernachlässigbar kleiner Melderstrom und in der ruhestromüberwachten Meldeleitung ein sehr geringer Ruhestrom IR fließen. Im Alarmfall (ab dem Zeitpunkt t1 gemäß der Fig. 2) fließt über den dann niederohmigen Sensor S zunächst der zentralseitig auf den Ruhestromgrenzwert IRG begrenzter Linienstrom 1, so daß die Linienspannung U mit dem Ruhespannungswert UR auf den Alarmspannungswert UAL absinkt. Sobald dies von der Zentrale (Z) als Alarm erkannt werden ist, wird zum Zeitpunkt t2 gemäß der Fig. 2 die Linienstrombegrenzung USB in der Zentrale (Z) vom Ruhestromgrenzwert IRG auf einen höheren Alarmstromgrenzwert IAL umgeschaltet.In the idle state, the line voltage U with the open-circuit voltage value UR is present at the detector M, while a negligibly small detector current flows in the detector and a very low closed-circuit current IR flows in the closed-circuit current-monitored signal line. In the event of an alarm (from time t1 according to FIG. 2), the line current 1 limited to the idle current limit value IRG flows through the low-resistance sensor S, so that the line voltage U drops with the idle voltage value UR to the alarm voltage value UAL. As soon as this is recognized as an alarm by the control center (Z), the line current limitation USB in the control center (Z) is switched from the quiescent current limit value IRG to a higher alarm current limit value IAL at time t2 in FIG. 2.

Die umschaltbare Strombegrenzungsschaltung USB in der Zentrale (Z) und die Auswerteschaltung AWS ist in Fig. 3 dargestellt und wird später noch ausführlicher erläutert. Die Erhöhung des Linienstroms 1 auf den Alarmstromgrenzwert IAL hat zur Folge, daß im Melder die Strombegrenzungsschaltung MSB aktiviert wird, die zunächst den Melderstrom auf den Stromwert der Ansprechschwelle IS begrenzt hat. Mit dem erhöhten Stromwert auf der Meldeleitung wird nun der Transistor T1 leitend und versorgt über einen Spannungsregler RS die Codiereinrichtung COD, die im vorliegenden Ausführungsbeispiel eine Impulsformerstufe aufweist. Die Codiereinrichtung COD besteht aus einem dekadischen Zähler DZ und einem als Rechteckgenerator geschalteten Operationsverstärker OV, der mit der Speisespannung US vom Spannungsregler SR versorgt wird. Beim Einschalten des Transistors T1 erhält der dekadische Zähler DZ über die RC-Kombination C1, R2 einen Resetimpuls am Reseteingang R des dekadischen Zählers DZ. Dadurch werden alle Ausgänge Q1 bis Q (n + 1) des dekadischen Zählers DZ LOW. Die vom Operationsverstärker OV erzeugen Rechteckimpulse bewirken mit jeder fallenden Flanke am Takteingang CL des dekadischen Zählers DZ an den Ausgängen Q1 bis Q (n + 1), daß der Reihe nach, jeweils nur ein Ausgang HIGH ist. Jeder LOW-Zustand des Operationsverstärkers OV hat über den Widerstand R3 eine Melderstromerhöhung auf den Stromwert IP zur Folge. Dies ist der Stromwert der binär codierten Meldersignale, die als Stromimpulse in der Zentrale empfangen werden. Ein HIGH-Pegel am Summenpunkt SP verlängert die Dauer des Stromimpulses. Die Länge eines Stromimpulses wird mit den Codierschaltern S1 bis Sn eingestellt, wobei ein geschlossener Schalter einen langen Impuls, entsprechend einer logischen Eins, und ein offener Schalter einen kurzen Impuls entsprechend einer logischen Null ergibt. Auf diese Weise entsteht ein n Bit langes serielles Impulstelegramm, das neben der binär codierten Meldernummer noch weitere Informationen enthalten kann. Dieses Impulstelegramm kann in der Zentrale mit der später beschriebenen Auswerteschaltung decodiert werden und die entsprechende Meldemummer kann angezeigt werden.The switchable current limiting circuit USB in the center (Z) and the evaluation circuit AWS is shown in Fig. 3 and will be explained in more detail later. Increasing the line current 1 to the alarm current limit value IAL has the result that the current limiting circuit MSB is activated in the detector, which initially limited the detector current to the current value of the response threshold IS. With the increased current value on the signal line, the transistor T1 now becomes conductive and supplies the coding device COD, which in the present exemplary embodiment has a pulse shaper stage, via a voltage regulator RS. The coding device COD consists of a decade counter DZ and an operational amplifier OV connected as a square wave generator, which is supplied with the supply voltage US from the voltage regulator SR. When transistor T1 is switched on, the decade counter DZ receives a reset pulse at the reset input R of the decade counter DZ via the RC combination C1, R2. As a result, all outputs Q1 to Q (n + 1) of the decadal counter DZ LOW. The square-wave pulses generated by the operational amplifier OV cause with each falling edge at the clock input CL of the decadal counter DZ at the outputs Q1 to Q (n + 1) that in turn only one output is HIGH. Each LOW state of the operational amplifier OV results in an increase in the detector current to the current value IP via the resistor R3. This is the current value of the binary coded detector signals, which are received as current pulses in the control center. A HIGH level at the sum point SP extends the duration of the current pulse. The length of a current pulse is set with the coding switches S1 to Sn, a closed switch giving a long pulse, corresponding to a logical one, and an open switch giving a short pulse corresponding to a logical zero. In this way, an n-bit serial pulse telegram is created, which can contain further information in addition to the binary-coded detector number. This pulse telegram can be decoded in the control center using the evaluation circuit described later and the corresponding message number can be displayed.

Dieses Impulstelegramm ist in Fig. 2b für den Melder mit der binären Nummer 1010 dargestellt. Fig. 2a zeigt den zeitlichen Spannungsverlauf. Nach den letzten Codedeimpuls zum Zeitpunkt t3 in Fig. 2b wird der Ausgang Q(n + 1) des dekadischen Zählers DZ HIGH und stoppt über die Diode D den Taktgeber OV, dessen Ausgang bis zum Ende der zentralseitigen Linienstromerhöhung (zum Zeitpunkt t4 in Fig. 2b) im LOW-Zustand bleibt und über den Widerstand R3 die Melderanzeige MA ansteuert.This pulse telegram is shown in Fig. 2b for the detector with the binary number 1010. 2a shows the voltage curve over time. After the last code pulse at time t3 in FIG. 2b, the output Q (n + 1) of the decadal counter DZ becomes HIGH and stops the clock generator OV via diode D, the output of which until the end of the central line current increase (at time t4 in FIG. 2b) remains in the LOW state and controls the detector display MA via the resistor R3.

In Fig. 3 ist ein mögliches Ausführungsbeispiel für die Auswertung der Meldenummer in der Zentrale Z gezeigt. An der Meldeleitung ML mit den beiden Adern a und b liegt die Linienspannung U. In der umschaltbaren Strombegrenzungsschaltung USB wird mit dem Widerstand R4 der Ruhestromgrenzwert IR, bei durchgeschaltetem Transistor T4 mit der Parallelschaltung der Widerstände R4 und R5 der Alarmstromgrenzwert IAL festgelegt. Der umschaltbaren Strombegrenzungsschaltung USB ist eine Auswerteschaltung AWS nachgeschaltet. Diese weist drei Komparatoren K1 bis K3 und ein Zeitglied R6, C2 auf. Der Komparator K1 schaltet beim Auftreten des Alarmkriteriums (Alarmspannungswert UAL) auf der Meldelinie ML. Dazu ist der Komparator K1 an der b-Ader der Meldelinie ML angeschlossen. Am zweiten Eingang des Komparators K1 liegt eine Referenzspannung U1 an. Der Ausgang des Komparators K1 führt zur Decodier- und Anzeigelogik DAL. Der zweite Komparator K2 ist mit seinem ersten Eingang an der umschaltbaren Strombegrenzungsschaltung USB angeschlossen. Am zweiten Eingang liegt eine Referenzspannung U2. Die dem Linienstrom proportionale Spannung U an den Widerständen R4 und R5 der umschaltbaren Strombegrenzungsschaltung USB wird dem zweiten Komparator K2 zugeführt, der bei den vom Melder (M) gesendeten codierten Stromimpulsen IP schaltet. Das Ausgangssignal des Komparators K2 gelangt über das Integrierglied R6 C2 an den Eingang des dritten Komparators K3. Am zweiten Eingang des Komparators K3 liegt die Referenzspannung U3 an. Die Referenzspannung U3 und die Zeitkonstante des Integriergliedes R6, C2 sind so bemessen, daß der Komparator K3 beim Eintreffen eines langen Impulses IP (binäre Eins) schaltet, beim Eintreffen eines kurzen Impulses IP (binäre Null) jedoch nicht. Der jeweilige Ausgang der Komparatoren K1 bis K3 ist auf den jeweiligen Eingang E1 bis E3 der Decodier- und Anzeigelogik DAL geführt, die beispielsweise von einem Microprozessor gebildet ist. Die Decodier-und Anzeige-Logik DAL erkennt über den Eingang E1 den Alarmzustand (Alarmspannungswert UAL) der Meldelinie ML und steuert über den Ausgang A1 die umschaltbare Strombegrenzungsschaltung USB an, die den Linienstrom I vom Ruhestromgrenzwert IRG auf den Alarmstromgrenzwert IAL erhöht. Über die Eingänge E2 und E3 empfängt die Decodier- und Anzeigelogik DAL das Meldertelegramm in Form der binärcodierten Stromimpulse (IP), decodiert es und zeigt über den Ausgang A2 die Meldernummer auf der Anzeigeeinrichtung ANZ an, die beispielsweise eine Sieben-Segment-Anzeige sein kann.3 shows a possible exemplary embodiment for evaluating the message number in the control center Z. The line voltage U is on the signal line ML with the two wires a and b. In the switchable current limiting circuit USB, the idle current limit value IR is set with the resistor R4, and with the transistor T4 switched on, the alarm current limit value IAL is set with the parallel connection of the resistors R4 and R5. The switchable current limiting circuit USB is followed by an evaluation circuit AWS. This has three comparators K1 to K3 and a timing element R6, C2. The comparator K1 switches when the alarm criterion (alarm voltage value UAL) occurs on the detection line ML. For this purpose, the comparator K1 is connected to the b-wire of the ML detection line. A reference voltage U1 is present at the second input of the comparator K1. The output of the comparator K1 leads to the decoding and display logic DAL. The second comparator K2 has its first input connected to the switchable current limiting circuit USB. A reference voltage U2 is present at the second input. The voltage U proportional to the line current at the resistors R4 and R5 of the switchable current limiting circuit USB is fed to the second comparator K2, which switches when the coded current pulses IP are sent by the detector (M). The output signal of the comparator K2 reaches the input of the third comparator K3 via the integrator R6 C2. The reference voltage U3 is present at the second input of the comparator K3. The reference voltage U3 and the time constant of the integrator R6, C2 are dimensioned such that the comparator K3 switches IP (binary one) when a long pulse arrives, but does not switch IP (binary zero) when a short pulse arrives. The respective output of the comparators K1 to K3 is led to the respective input E1 to E3 of the decoding and display logic DAL, which is formed, for example, by a microprocessor. The decoding and display logic DAL recognizes the alarm state via input E1 (alarm voltage value UAL) the detection line ML and controls the switchable current limiting circuit USB via the output A1, which increases the line current I from the quiescent current limit value IRG to the alarm current limit value IAL. Via the inputs E2 and E3, the decoding and display logic DAL receives the detector telegram in the form of the binary-coded current pulses (IP), decodes it and displays the detector number via the output A2 on the display device ANZ, which can be, for example, a seven-segment display .

BezugszeichenlisteReference symbol list

  • ANZ AnzeigeeinrichtungANZ display device
  • AWE AuswerteeinrichtungAWE evaluation device
  • AWS AuswerteschaltungAWS evaluation circuit
  • COD CodiereinrichtungCOD coding device
  • DAL Decodier- und Anzeige-LogikDAL decoding and display logic
  • DZ dekadischer ZählerDZ decadic counter
  • 1 Linienstrom1 line current
  • IAL AlarmstromgrenzwertIAL alarm current limit
  • IR RuhestromIR quiescent current
  • IRG RuhestromgrenzwertIRG quiescent current limit
  • IS Stromwert der AnsprechschwelleIS Current value of the response threshold
  • IP Stromwert der binärcodierten Meldersignale (Stromimpulse)IP current value of the binary-coded detector signals (current pulses)
  • K KomparatorK comparator
  • MA Melderanzeige (z. B. LED)MA detector display (e.g. LED)
  • MSB Strombegrenzungsschaltung im MelderMSB current limiting circuit in the detector
  • M MelderM detector
  • ML MeldeleitungML reporting line
  • OV OperationsverstärkerOV operational amplifier
  • S SensorS sensor
  • S1 bis Sn CodierschalterS1 to Sn coding switch
  • SR Spannungsregler im MelderSR voltage regulator in the detector
  • SP SummenpunktSP sum point
  • T TransistorT transistor
  • U LinienspannungU line voltage
  • ULA AlarmspannungswertULA alarm voltage value
  • UR RuhespannungswertUR quiescent voltage value
  • US SpeisespannungUS supply voltage
  • USB umschaltbare Strombegrenzungsschaltung in der ZentraleUSB switchable current limiting circuit in the control center
  • U1 bis U3 ReferenzspannungenU1 to U3 reference voltages
  • Z ZentraleZ headquarters

Claims (7)

1. Method of identifying an alarm-triggering sensor in a danger-signalling device having several annunciation circuits (ML) connected to a control centre (Z), having several sensors (M) in each case, which are connected to each individual annunciator circuit (ML) and each have an adjustable coder (COD), and having a decoder in an evaluaction device (AWE) which is arranged in the control centre (Z), an alarm-triggering sensor (M) causing a change in voltage of the line voltage (U), and the control centre detecting an alarm annunciation of the annunciator circuit (ML) concerned and sending to the annunciator circuit (ML) a signal which causes the coder (COD) of the alarm-triggering sensor (M) to transmit the preset annunciator coding to the control centre (Z) by means of binary coded pulses (IP), the binary coded pulses (IP) being decoded, and the alarm-triggering sensor being displayed (ANZ) in the evaluation device (AWE), characterised in that in the case of an alarm in the control centre (Z) the line current (I) of the annunciator circuit (ML) is increased from a closed-circuit current limiting value (IRG) to an alarm current limiting value (IAL), and in that a response threshold (IS) of a current limiting circuit (MSB) arranged in the sensor (M) is thereby overshot, and the coder (COD) is triggered.
2. Device for carrying out the method according" to Claim 1, characterised in that each sensor has a detector (S) of high resistance in the state of rest, which is connected in series with a current limiting circuit (MSB) to the annunciation circuit (ML), in that the coder (COD) downstream of the current limiting circuit (MSB) is composed of a codable (S1 to Sn) decade counter (DZ) and a square-wave generator (OV) downstream thereof, which generates the corresponding current pulses (IP) on the annunciation circuit (ML) and in that the evaluation device (AWE) of the control centre (Z) has a reversible current limiting circuit (USB), which limits the line current (I) to the closed-circuit current limiting value (IRG), or, in the case of an alarm, to the higher alarm current limiting value (IAL), the evaluation circuit (AWS) downstream of the reversible current limiting circuit (USB) triggering a downstream decode and display logic (DAL).
3. Device according to Claim 2, characterised in that the evaluation circuit (AWS) has two comparators (K1 and K2) downstream of the reversible current limiting circuit (USB), the first comparator (K1) emitting an output signal when the alarm voltage (UAL) occurs on the annunciation circuit (ML), and the second comparator (K2) emitting an output signal when the coded current pulse (IP) transmitted by the sensor occurs, in that the evaluation circuit (AWS) has a third comparator (K3), which is connected downstream of the second comparator (K2) via an integrating element (R6, C2), the third comparator (K3) transmitting an output signal only for long current pulses (IP), and in that the respective output of the three comparators leads to an input (E1 to E3) of the decode and display logic (DAL), which latter, in the case of an alarm, triggers the reversible current limiting circuit (USB) and decodes the current pulses (IP) of the sensor, and indicates the alarm-triggering sensor at the display device (ANZ).
4. Device according to Claim 2, characterised in that the square-wave generator is composed of an operational amplifier (OV).
5. Device according to Claim 2 or 4, characterised in that connected downstream of the operational amplifier (OV) is the series connection of a resistor (R3) and a light-emitting diode (MA), through which flows the current (IP) generated by the square-wave generator.
6. Device according to Claim 2, characterised in that a voltage regulator (SR) is provided between the current limiting circuit (MSB) of the sensor and the coder (COD).
7. Device according to Claim 2 or 3, characterised in that the decode and display logic (DAL) is composed of a microprocessor.
EP84115075A 1984-06-05 1984-12-10 Method of and device for identifying an alarm triggering sensor in a danger signalling device Expired EP0167669B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84115075T ATE43929T1 (en) 1984-06-05 1984-12-10 PROCEDURE AND ARRANGEMENT FOR IDENTIFYING AN ALARM DETECTOR IN AN ALARM SYSTEM.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3420933 1984-06-05
DE3420933 1984-06-05

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EP0167669A1 EP0167669A1 (en) 1986-01-15
EP0167669B1 true EP0167669B1 (en) 1989-06-07

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EP84115075A Expired EP0167669B1 (en) 1984-06-05 1984-12-10 Method of and device for identifying an alarm triggering sensor in a danger signalling device

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EP (1) EP0167669B1 (en)
AT (1) ATE43929T1 (en)
DE (1) DE3478654D1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2533382C2 (en) * 1975-07-25 1980-07-03 Siemens Ag, 1000 Berlin Und 8000 Muenchen Method and device for the transmission of measured values in a fire alarm system
US4203096A (en) * 1978-04-06 1980-05-13 Mallinckrodt, Inc. Sensor monitoring alarm system
DE2836760C2 (en) * 1978-08-23 1983-11-17 Dr. Alfred Ristow GmbH & Co, 7500 Karlsruhe Electronic remote monitoring system
JPS585896A (en) * 1981-07-02 1983-01-13 能美防災工業株式会社 Fire alarm facility
DE3128796A1 (en) * 1981-07-21 1983-02-10 Esser Sicherheitstechnik GmbH & Co KG, 4040 Neuss Fire or intrusion detection system
SE8202566L (en) * 1982-04-23 1983-10-24 Ericsson Telefon Ab L M PROCEDURE AND DEVICE FOR IDENTIFYING AN ALARMING DETECTOR IN A CIRCUIT WITH A PRESET NUMBER OF PARALLEL CONNECTED DETECTORS

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ATE43929T1 (en) 1989-06-15
DE3478654D1 (en) 1989-07-13
EP0167669A1 (en) 1986-01-15

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