EP0254125A1 - Danger signalling system - Google Patents
Danger signalling system Download PDFInfo
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- EP0254125A1 EP0254125A1 EP87109814A EP87109814A EP0254125A1 EP 0254125 A1 EP0254125 A1 EP 0254125A1 EP 87109814 A EP87109814 A EP 87109814A EP 87109814 A EP87109814 A EP 87109814A EP 0254125 A1 EP0254125 A1 EP 0254125A1
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- detector
- voltage
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- polling
- query
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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 a hazard alarm system according to the preamble of claim 1.
- the object of the invention is therefore to shorten the alarm detection time in a hazard alarm system described at the outset.
- the rapid alarm detection is achieved according to the invention in that the control center executes status polling cycles in quick succession and, in the event of a status change or if there is any other requirement, regular polling cycles. If a change in detector status is detected on a line, a regular polling cycle is then carried out for this line, in which the detector address is also determined. In this context it can also be called an address polling cycle, although this is a conventional pulse detector polling cycle in which both the analog detector measured value and the detector address are recorded.
- the status query is carried out with a query voltage that differs from the query voltage in the regular query cycle. Accordingly, according to the invention, each detector is additionally provided with a comparison device which switches the subsequent detector on without delay, ie immediately, when the status is queried.
- the status query according to the invention has the advantage that the alarm detection time is considerably shortened because only a change in status is checked.
- the query time is therefore independent of the number of detectors per line.
- the longer regular polling cycle address polling cycle
- the regular polling cycle is required if control commands are transmitted to certain detectors or control elements which are assigned to certain detectors, as already known from DE-PS 25 33 354.
- FIG. 1 shows the known connection of the individual detectors M1 to Mn to a detection line ML with the line wire pair a, b at the control center Z.
- the detectors are connected in a chain and each have a controllable switch ST1, ST2, etc. in the b-wire.
- ST1, ST2, etc. When the interrogation voltage is applied, the subsequent detectors are switched on to the signaling line with a time delay in normal operation. This is known and need not be explained in detail.
- a detector according to the invention for the status query is shown in a block diagram in FIG.
- the circuit is partially known from the conventional pulse detector.
- a timing element ZG is connected to the detection line, ie to line wire a and line wire b, the duration of which is determined by the measured value of the detector.
- the analog detector measurement value determines the running time. This switching example is based on a manually operated detector.
- the detector status depends on the position of switch S1, R corresponds to the rest position, A corresponds to the alarm position and S corresponds to a fault, which each cause different delay times.
- the output from the timing element ZG causes a current pulse via the transverse transistor TQ and the transverse resistor RQ via the pulse generator IG.
- This current pulse is measured and evaluated in a known manner in the control center. Furthermore, the output of the timing element ZG controls the switch ST via the OR link OR, which is closed after the timing element ZG has expired and switches the detection line b through to the next detector (b) in a known manner. Normal pulse detectors are connected to the line one after the other and send their measuring current pulses IL one after the other via the detection line a, b to the control center Z.
- a comparator K is provided in each detector Mi, which immediately closes the switch ST for the status query when the query voltage for the status query is on the message line ML.
- a reference voltage Uref at the comparator K which is less than the query voltage for the status query.
- the interrogation voltage UL reaches the second input of the comparator K via the signal line ML. If the voltage on the signal line exceeds the Uref specified at the comparator input, the output of the comparator K emits a signal via the OR gate OR, so that the switch ST is closed and a transfer to the next detector regardless of the running time of the timing element ZG he follows.
- FIGS 3a and 3b show a voltage and a current diagram.
- 3a shows the line voltage UL as a function of time t.
- the line current IL measured in the control center is plotted below the time t accordingly.
- Each polling cycle begins with the start signal U0, ie the line voltage UL is reduced to the value 0. This short start signal ensures that all detectors are switched off by the signaling line.
- the interrogation voltage is switched to the signaling line.
- a query voltage U3 is applied for the status query cycle ZAZ. This query voltage is higher than the query voltage U2 for the regular query cycle RAZ.
- the reference input Uref of the comparator K in the respective detector (Mi) can be based on the value be set.
- the switches ST immediately switch through via the OR link OR.
- the b-wire is connected through to the last detector Mn. All detectors are connected to the alarm line in parallel and all ZG timers start at the same time. Are all detectors in the idle state, they send their measuring current pulses Ii to In simultaneously at the time tR, as shown in FIG. 3b.
- one detector sends an alarm
- another detector a fault, i.e. A measuring current pulse I2 comes at time tA
- another measuring current pulse I3 comes later, at time tS.
- the other detectors simultaneously emit their quiescent current pulses at time tR. This is shown in Fig.3b.
- the evaluation device in the control center can distinguish between the alarm, fault and Ruheim pulses, but it cannot recognize the number of the detector (detector address).
- the relevant detector addresses are determined in the subsequent regular query cycle RAZ1.
- This regular polling cycle is a completely normal pulse detector polling cycle with the regular polling voltage U2, which is lower than the polling voltage U3 for the state change.
- the respective comparators do not switch with this voltage on the signal line, i.e. the individual switches STi are only closed after the associated time elements ZGi have expired.
- the detectors thus send their measuring current pulses one after the other in a known manner.
- Control signals are transmitted to the detector M2, as is done in a known manner by reducing the voltage to U1.
- the open circuit voltage UR is connected to the line in a known manner after the query time AZ.
- This (UR) is greater than the interrogation voltage U3 and serves to supply energy to the detectors, in particular also Charging the energy buffer capacitors provided there.
- Figure 4 shows an embodiment of the detector according to the invention.
- the capacitors C1 and C2 discharge, the transistor T3 is blocked. So all detectors are switched off by the reporting line.
- the timing element ZG consists of the resistors R1, R2, R3, the capacitor C1 and the transistor T1.
- the capacitor C1 charges in the idle state of the detector via R3, in the alarm state AL, i.e. when the switch S2 is closed, via the parallel connection of R3 and R2.
- the transistor T1 becomes conductive with a delay.
- the pulse generator IG which consists of the capacitor C2 and the resistors R4, R5 and the transistor T2, the measuring current pulse Ii is generated via the resistor R6.
- the (switching through) transistor T3 becomes conductive, which switches the line b on to the next detector.
- the Zener diode ZD1 With the regular interrogation with the lower interrogation voltage U2, the Zener diode ZD1 remains ineffective.
- the transistor T3 becomes conductive via the Zener diode ZD1 immediately after the voltage is applied, that is to say regardless of the running time of the timing element.
- the invention also has the advantage that an alarm detection can be ensured in a simple manner in the case of conventional pulse signaling lines if the central evaluation device fails. It can are only recognized on line alarm, but the alarm triggering detector is not identified. With this status query according to the invention, an alarm can also be recognized if one of the switching transistors T3 or the switch ST remains closed, for example due to a lightning effect. In this case too, alarm detection of the relevant message line is possible.
Abstract
Description
Die Erfindung bezieht sich auf eine Gefahrenmeldeanlage gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a hazard alarm system according to the preamble of
Bei Gefahrenmeldeanlagen, insbesondere bei Einbruch- oder Brandmeldeanlagen mit manuell betätigbaren Meldern, beispielsweise Druckknopfmeldern, ist es notwendig, eine Alarmierung möglichst rasch zu erkennen. In Gefahrenmeldeanlagen, die nach dem sogenannten Puls-Melde-Prinzip arbeiten (DE-PS 25 33 382), senden bei der Linienabfrage alle an eine Meldeleitung angeschlossenen Melder in bekannter Weise nacheinander Meßstromimpulse an die Zentrale. Üblicherweise sind an einer zentralen Baugruppe mehrere Linien angeschaltet, die nacheinander abgefragt werden. Die Abfragezeit eines Melders hängt somit von der Linienanzahl und der Anzahl der Melder pro Linie ab. Normalerweise kann frühestens nach dieser Zeit die Zustandsänderung des betreffenden Melders, d.h. des alarmauslösenden Melders, erkannt werden. Mit der Alarmgabe dieses Melders erfolgt gleichzeitig die Adressenangabe, die Auswertung für beide Meldergrößen wird in der Zentrale vorgenommen und angezeigt. Das heißt, eine Auswertung und Aussage über eine Melderzustandsänderung erfolgt erst nach einem vollständigen Abfragezyklus. Wenn auch die einzelnen Abfragezyklen verhältnismäßig kurz sind, kann es dennoch notwendig sein, möglichst schnell eine Brandmeldung oder eine Überfallmeldung im Falle einer Intrusionsschutzanlage sofort zu erkennen.In the case of hazard detection systems, in particular intrusion or fire detection systems with manually operated detectors, for example push-button detectors, it is necessary to recognize an alarm as quickly as possible. In alarm systems that work according to the so-called pulse-signaling principle (DE-PS 25 33 382), all detectors connected to a signal line successively send measuring current pulses to the control center in a known manner when the line is queried. Usually, several lines are connected to a central module, which are queried one after the other. The query time of a detector thus depends on the number of lines and the number of detectors per line. Normally after this time at the earliest, the status change of the relevant detector, ie the alarm triggering detector, can be recognized. When this detector is alarmed, the address is given at the same time, the evaluation for both detector sizes is carried out and displayed in the control center. This means that an evaluation and statement about a change in detector status only takes place after a complete query cycle. Even if the individual polling cycles are relatively short, it may still be necessary to recognize a fire report or an attack report in the case of an intrusion protection system as quickly as possible.
Aufgabe der Erfindung ist es daher, bei einer eingangs geschilderten Gefahrenmeldeanlage die Alarmerkennungszeit zu verkürzen.The object of the invention is therefore to shorten the alarm detection time in a hazard alarm system described at the outset.
Diese Aufgabe wird erfindungsgemäß bei einer nach dem Puls-Melde-Prinzip arbeitenden Gefahrenmeldeanlage mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst.This object is achieved according to the invention in a hazard alarm system operating on the pulse-reporting principle with the characterizing features of
Mit der Erfindung ist es möglich, innerhalb wesentlich kürzerer Zeit festzustellen, ob auf einer Linie ein Melder seinen Zustand verändert hat, also von Ruhe in Alarm oder Störung geschaltet hat. In diesen Fall ist die Ermittlung des Melderortes zweitrangig, so daß hierfür eine längere Zeit benötigt werden darf. Die schnelle Alarmerkennung wird erfindungsgemäß dadurch erreicht, daß von der Zentrale aus rasch aufeinander folgende Zustandsabfragezyklen und im Falle einer Zustandsänderung oder bei einem anderweitigen Bedarf reguläre Abfragezyklen durchgeführt werden. Wird auf einer Linie eine Melderzustandsänderung erkannt, so wird anschließend für diese Linie ein regulärer Abfragezyklus durchgeführt, bei dem auch die Melderadresse ermittelt wird. Man kann ihn in diesem Zusammenhang auch als Adressabfragezyklus bezeichnen, obwohl dieser ein herkömmlicher Pulsmelderabfragezyklus ist, bei dem sowohl der analoge Meldermeßwert und die Melderadresse erfaßt werden. Dabei erfolgt die Zustandsabfrage mit einer Abfragespannung, die von der Abfragespannung beim regulären Abfragezyklus abweicht. Dementsprechend ist erfindungsgemäß zusätzlich jeder Melder mit einer Vergleichseinrichtung versehen, welche bei der Zustandsabfrage den nachfolgenden Melder unverzögert, d.h. unmittelbar, anschaltet.With the invention, it is possible to determine within a considerably shorter time whether a detector has changed its state on a line, ie has switched from rest to alarm or fault. In this case, the determination of the reporting location is of secondary importance, so that a longer time may be required for this. The rapid alarm detection is achieved according to the invention in that the control center executes status polling cycles in quick succession and, in the event of a status change or if there is any other requirement, regular polling cycles. If a change in detector status is detected on a line, a regular polling cycle is then carried out for this line, in which the detector address is also determined. In this context it can also be called an address polling cycle, although this is a conventional pulse detector polling cycle in which both the analog detector measured value and the detector address are recorded. The status query is carried out with a query voltage that differs from the query voltage in the regular query cycle. Accordingly, according to the invention, each detector is additionally provided with a comparison device which switches the subsequent detector on without delay, ie immediately, when the status is queried.
Da bei Gefahrenmeldeanlagen die Melder die meiste Zeit im Ruhezustand sind, hat die erfindungsgemäße Zustandsabfrage den Vorteil, daß die Alarmerkennungszeit erheblich verkürzt wird, weil nur auf eine Zustandsänderung geprüft wird. Die Abfragezeit ist somit unabhängig von der Anzahl der Melder pro Linie. Der längerdauernde reguläre Abfragezyklus (Adressabfragezyklus) wird entweder durchgeführt, wenn eine Zustandsänderung auf der Meldelinie erkannt wurde, oder wenn ein sonstiger Bedarf vorliegt, beispielsweise um die Funktion der angeschlossenen Melder zu prüfen. Ferner ist der reguläre Abfragezyklus erforderlich, wenn Steuerbefehle an bestimmte Melder oder Steuerorgane, die bestimmten Meldern zugeordnet sind, übertragen werden, wie bereits aus der DE-PS 25 33 354 bekannt.Since the detectors are mostly in the idle state in hazard alarm systems, the status query according to the invention has the advantage that the alarm detection time is considerably shortened because only a change in status is checked. The query time is therefore independent of the number of detectors per line. The longer regular polling cycle (address polling cycle) is carried out either when a change in status has been detected on the detection line or when there is another need, for example to check the function of the connected detectors. Furthermore, the regular polling cycle is required if control commands are transmitted to certain detectors or control elements which are assigned to certain detectors, as already known from DE-PS 25 33 354.
Weitere Ausgestaltungen und Vorteile der Erfindung ergeben sich aus den Unteransprüchen.Further refinements and advantages of the invention result from the subclaims.
Im folgenden wird anhand der Zeichnung die Erfindung im einzelnen beschrieben. Dabei zeigen
- Fig. 1 die bekannte Anschaltung der Melder an einer Zentrale,
- Fig. 2 eine Prinzipschaltung eines erfindungsgemäßen Melders,
- Fig. 3a und 3b Spannungs- und Stromdiagramme und
- Fig. 4 ein Ausführungsbeispiel des erfindungsgemäßen Melders.
- 1 shows the known connection of the detectors to a control center,
- 2 shows a basic circuit of a detector according to the invention,
- 3a and 3b voltage and current diagrams and
- Fig. 4 shows an embodiment of the detector according to the invention.
In Fig. 1 ist die bekannte Anschaltung der einzelnen Melder M1 bis Mn an einer Meldelinie ML mit dem Leitungsadernpaar a,b an der Zentrale Z dargestellt. Die Melder sind kettenförmig angeschlossen und weisen jeweils in der b-Ader einen ansteuerbaren Schalter ST1, ST2, usw. auf. Mit dem Anlegen der Abfragespannung werden der Reihe nach im regulären Betrieb jeweils zeitverzögert die jeweils nachfolgenden Melder an die Meldeleitung angeschaltet. Dies ist bekannt und muß nicht im einzelnen erläutert werden.1 shows the known connection of the individual detectors M1 to Mn to a detection line ML with the line wire pair a, b at the control center Z. The detectors are connected in a chain and each have a controllable switch ST1, ST2, etc. in the b-wire. When the interrogation voltage is applied, the subsequent detectors are switched on to the signaling line with a time delay in normal operation. This is known and need not be explained in detail.
In Fig.2 ist an einem Blockschaltbild ein erfindungsgemäßer Melder für die Zustandsabfrage dargestellt. Die Schaltung ist teilweise vom herkömmlichen Pulsmelder bekannt. An der Meldelinie, d.h. an der Leitungsader a und an der Leitungsader b, ist ein Zeitglied ZG angeschlossen, dessen Laufzeit vom Meldermeßwert bestimmt ist. Bei automatischen Brandmeldern bestimmt der analoge Meldermeßwert die Laufzeit. Diesem Schaltbeispiel liegt ein manuell betätigbarer Melder zugrunde. Der Melderzustand ist hier von der Stellung des Schalters S1 abhängig, R entspricht der Ruhestellung, A der Alarmstellung und S einer Störung, die jeweils unterschiedliche Verzögerungszeiten bewirken. Der Ausgang vom Zeitglied ZG verursacht über den Impulsgeber IG einen Stromimpuls über den Quertransistor TQ und den Querwiderstand RQ. Dieser Stromimpuls wird in bekannter Weise in der Zentrale gemessen und ausgewertet. Des weiteren steuert der Ausgang des Zeitgliedes ZG über die Oder-Verknüpfung OR den Schalter ST, der nach Ablauf des Zeitgliedes ZG geschlossen wird und die Meldelinie b in bekannter Weise zum nächsten Melder (b) durchschaltet. Normale Pulsmelder werden so der Reihe nach an die Linie angeschaltet und senden nacheinander ihre Meßstromimpulse IL über die Meldelinie a,b zur Zentrale Z.A detector according to the invention for the status query is shown in a block diagram in FIG. The circuit is partially known from the conventional pulse detector. A timing element ZG is connected to the detection line, ie to line wire a and line wire b, the duration of which is determined by the measured value of the detector. In the case of automatic fire detectors, the analog detector measurement value determines the running time. This switching example is based on a manually operated detector. The detector status depends on the position of switch S1, R corresponds to the rest position, A corresponds to the alarm position and S corresponds to a fault, which each cause different delay times. The output from the timing element ZG causes a current pulse via the transverse transistor TQ and the transverse resistor RQ via the pulse generator IG. This current pulse is measured and evaluated in a known manner in the control center. Furthermore, the output of the timing element ZG controls the switch ST via the OR link OR, which is closed after the timing element ZG has expired and switches the detection line b through to the next detector (b) in a known manner. Normal pulse detectors are connected to the line one after the other and send their measuring current pulses IL one after the other via the detection line a, b to the control center Z.
Erfindungsgemäß ist in jedem Melder Mi ein Komparator K vorgesehen, der für die Zustandsabfrage den Schalter ST sofort schließt, wenn die Abfragespannung für die Zustandsabfrage an der Meldeleitung ML liegt. Dazu liegt am Komparator K eine Referenzspannung Uref die kleiner ist als die Abfragespannung für die Zustandsabfrage. Die Abfragespannung UL gelangt an den zweiten Eingang des Komparators K über die Meldeleitung ML. Wenn die Spannung an der Meldeleitung den am Komparatoreingang vorgegebenen Uref überschreitet, gibt der Ausgang des Komparators K ein Signal über das Oder-Glied OR ab, so daß der Schalter ST geschlossen wird und eine Weiterschaltung an den nächsten Melder unabhängig von der Laufzeit des Zeitgliedes ZG erfolgt.According to the invention, a comparator K is provided in each detector Mi, which immediately closes the switch ST for the status query when the query voltage for the status query is on the message line ML. For this purpose there is a reference voltage Uref at the comparator K which is less than the query voltage for the status query. The interrogation voltage UL reaches the second input of the comparator K via the signal line ML. If the voltage on the signal line exceeds the Uref specified at the comparator input, the output of the comparator K emits a signal via the OR gate OR, so that the switch ST is closed and a transfer to the next detector regardless of the running time of the timing element ZG he follows.
Die Figuren 3a und 3b zeigen ein Spannungs- und ein Stromdiagramm. In Fig.3a ist die Linienspannung UL in Abhängigkeit der Zeit t aufgetragen. Entsprechend darunter ist der in der Zentrale gemessene Linienstrom IL über der Zeit t aufgetragen. Jeder Abfragezyklus beginnt mit dem Startsignal U0, d.h. die Linienspannung UL wird auf den Wert 0 abgesenkt. Mit diesem kurzen Startsignal wird erreicht, daß sämtliche Melder von der Meldeleitung abgeschaltet werden. Zum Zeitpunkt t0 wird die Abfragespannung an die Meldeleitung geschaltet. Für den Zustandsabfragezyklus ZAZ wird beispielsweise eine Abfragespannung U3 angelegt. Diese Abfragespannung ist gegenüber der Abfragespannung U2 für den regulären Abfragezyklus RAZ höher. Der Referenzeingang Uref des Komparators K im jeweiligen Melder (Mi) kann dabei auf den Wert eingestellt sein. Damit schalten mit der Abfragespannung U3, die am zweiten Eingang aller Komparatoren anliegt, über die Oder-Verknüpfung OR die Schalter ST sofort durch. Damit ist die b-Ader bis zum letzten Melder Mn durchverbunden. Alle Melder hängen parallel an der Meldeleitung und alle Zeitglieder ZG starten gleichzeitig. Sind alle Melder im Ruhezustand, so senden sie ihre Meßstromimpulse Ii bis In gleichzeitig zum Zeitpunkt tR, wie dies in Fig.3b gezeigt ist.Figures 3a and 3b show a voltage and a current diagram. 3a shows the line voltage UL as a function of time t. The line current IL measured in the control center is plotted below the time t accordingly. Each polling cycle begins with the start signal U0, ie the line voltage UL is reduced to the value 0. This short start signal ensures that all detectors are switched off by the signaling line. At time t0, the interrogation voltage is switched to the signaling line. For example, a query voltage U3 is applied for the status query cycle ZAZ. This query voltage is higher than the query voltage U2 for the regular query cycle RAZ. The reference input Uref of the comparator K in the respective detector (Mi) can be based on the value be set. Thus, with the interrogation voltage U3, which is present at the second input of all comparators, the switches ST immediately switch through via the OR link OR. The b-wire is connected through to the last detector Mn. All detectors are connected to the alarm line in parallel and all ZG timers start at the same time. Are all detectors in the idle state, they send their measuring current pulses Ii to In simultaneously at the time tR, as shown in FIG. 3b.
Im zweiten Zustandsabfragezyklus ZAZ2 sendet beispielsweise ein Melder Alarm, ein anderer Melder eine Störung, d.h. ein Meßstromimpuls I2 kommt bereits zum Zeitpunkt tA, ein anderer Meßstromimpuls I3 erst später, zum Zeitpunkt tS. Die übrigen Melder geben gleichzeitig ihre Ruhe-Stromimpulse zum Zeitpunkt tR ab. Dies ist in Fig.3b dargestellt. Die Auswerteeinrichtung in der Zentrale kann zwischen den Alarm-, Störungs- und Ruheimpulsen unterscheiden, sie kann jedoch nicht die Nummer des Melders (Melderadresse) erkennen.In the second status query cycle ZAZ2, for example, one detector sends an alarm, another detector a fault, i.e. A measuring current pulse I2 comes at time tA, another measuring current pulse I3 comes later, at time tS. The other detectors simultaneously emit their quiescent current pulses at time tR. This is shown in Fig.3b. The evaluation device in the control center can distinguish between the alarm, fault and Ruheim pulses, but it cannot recognize the number of the detector (detector address).
Dazu werden im nachfolgenden regulären Abfragezyklus RAZ1 die betreffenden Melderadressen ermittelt. Dieser reguläre Abfragezyklus ist ein ganz normaler Pulsmelderabfragezyklus mit der regulären Abfragespannung U2, die gegenüber der Abfragespannung U3 für die Zustandsänderung niedriger ist. Mit dieser Spannung an der Meldeleitung schalten die jeweiligen Komparatoren nicht, d.h. die einzelnen Schalter STi werden erst nach Ablauf der zugehörigen Zeitglieder ZGi geschlossen. Die Melder senden somit in bekannter Weise ihre Meßstromimpulse nacheinander. Bei dieser Abfrage können auch, z.B. zum Melder M2, Steuerbefehle übertragen werden, wie dies in bekannter Weise durch eine Spannungsabsenkung auf U1 geschieht.For this purpose, the relevant detector addresses are determined in the subsequent regular query cycle RAZ1. This regular polling cycle is a completely normal pulse detector polling cycle with the regular polling voltage U2, which is lower than the polling voltage U3 for the state change. The respective comparators do not switch with this voltage on the signal line, i.e. the individual switches STi are only closed after the associated time elements ZGi have expired. The detectors thus send their measuring current pulses one after the other in a known manner. With this query, e.g. Control signals are transmitted to the detector M2, as is done in a known manner by reducing the voltage to U1.
Die Ruhespannung UR wird in bekannter Weise nach der Abfragezeit AZ an die Linie geschaltet. Diese (UR) ist größer als die Abfragespannung U3 und dient der Energieversorgung der Melder, insbesondere auch der Aufladung der dort vorgesehenen Energiepufferkondensatoren.The open circuit voltage UR is connected to the line in a known manner after the query time AZ. This (UR) is greater than the interrogation voltage U3 and serves to supply energy to the detectors, in particular also Charging the energy buffer capacitors provided there.
Die Figur 4 zeigt ein Ausführungsbeispiel des erfindungsgemäßen Melders. Während der kurzen Startzeit SZ mit dem Startsignal U0 = 0 entladen sich die Kondensatoren C1 und C2, der Transistor T3 ist gesperrt. Es werden also alle Melder von der Meldeleitung abgeschaltet.Figure 4 shows an embodiment of the detector according to the invention. During the short start time SZ with the start signal U0 = 0, the capacitors C1 and C2 discharge, the transistor T3 is blocked. So all detectors are switched off by the reporting line.
Das Zeitglied ZG besteht aus den Widerständen R1,R2,R3, dem Kondensator C1 und dem Transistor T1. Nach Anlegen der Abfragespannung beispielsweise U2 für den regulären Abfragezyklus RAZ an die Melderklemmen a,b lädt sich der Kondensator C1 im Ruhezustand des Melders über R3, im Alarmzustand AL, also wenn der Schalter S2 geschlossen ist, über die Parallelschaltung aus R3 und R2 auf. Der Transistor T1 wird verzögert leitend. Über den Impulsgeber IG, der aus dem Kondensator C2 und den Widerständen R4,R5 und dem Transistor T2 besteht, wird über den Widerstand R6 der Meßstromimpuls Ii erzeugt. Über die Diode D1 und den Widerstand R7 wird der (Durchschalte)Transistor T3 leitend, der die Leitung b nach bzum nächsten Melder weiterschaltet. Bei der regulären Abfrage mit der niedrigeren Abfragespannung U2 bleibt die Zenerdiode ZD1 wirkungslos. Beim Anliegen der höheren Abfragespannung U3 für die Zustandsabfrage wird dagegen der Transistor T3 über die Zenerdiode ZD1 sofort nach Anliegen der Spannung leitend, also unabhängig von der Laufzeit des Zeitgliedes.The timing element ZG consists of the resistors R1, R2, R3, the capacitor C1 and the transistor T1. After application of the interrogation voltage, for example U2 for the regular interrogation cycle RAZ to the detector terminals a, b, the capacitor C1 charges in the idle state of the detector via R3, in the alarm state AL, i.e. when the switch S2 is closed, via the parallel connection of R3 and R2. The transistor T1 becomes conductive with a delay. Via the pulse generator IG, which consists of the capacitor C2 and the resistors R4, R5 and the transistor T2, the measuring current pulse Ii is generated via the resistor R6. Via the diode D1 and the resistor R7, the (switching through) transistor T3 becomes conductive, which switches the line b on to the next detector. With the regular interrogation with the lower interrogation voltage U2, the Zener diode ZD1 remains ineffective. In contrast, when the higher interrogation voltage U3 for the state interrogation is present, the transistor T3 becomes conductive via the Zener diode ZD1 immediately after the voltage is applied, that is to say regardless of the running time of the timing element.
Die Erfindung hat darüberhinaus auch noch den Vorteil, daß bei herkömmlichen Pulsmeldeleitungen bei Ausfall der zentralen Auswerteeinrichtung auf einfache Weise noch eine Alarmerkennung sichergestellt werden kann. Es kann dabei lediglich auf Leitungsalarm erkannt werden, jedoch der alarmauslösende Melder nicht identifiziert werden. Mit dieser erfindungsgemäßen Zustandsabfrage kann auch ein Alarm erkannt werden, wenn einer der Durchschaltetransistoren T3 bzw. der Schalter ST beispielsweise aufgrund einer Blitzeinwirkung ständig geschlossen bliebe. Auch in diesem Fall ist eine Alarmerkennung der betreffenden Meldeleitung möglich.The invention also has the advantage that an alarm detection can be ensured in a simple manner in the case of conventional pulse signaling lines if the central evaluation device fails. It can are only recognized on line alarm, but the alarm triggering detector is not identified. With this status query according to the invention, an alarm can also be recognized if one of the switching transistors T3 or the switch ST remains closed, for example due to a lightning effect. In this case too, alarm detection of the relevant message line is possible.
Claims (3)
dadurch gekennzeichnet, daß im Melder (Mi) neben dem Zeitglied (ZG) und dem Impulsgeber (IG) ein Komparator (K) angeordnet ist, an dessen ersten Eingang eine Referenzspannung (Uref) und an dessen zweiten Eingang die Linienspannung (UL) anliegt und dessen Ausgang über ein Oder-Glied (OR) den Schalter (ST) steuert.2. Hazard detection system according to claim 1,
characterized in that in the detector (Mi) next to the timing element (ZG) and the pulse generator (IG) a comparator (K) is arranged, at the first input of a reference voltage (Uref) and at the second input of the line voltage (UL) and whose output controls the switch (ST) via an OR gate (OR).
dadurch gekennzeichnet, daß die Abfragespannung (U3) für die Zustandsabfrage (ZAZ) größer als die Abfragespannung (U2) für die reguläre Abfrage (RAZ) ist, und daß der Wert der Referenzspannung (Uref) zwischen den beiden Abfragespannungen (U2 und U3) liegt.3. Hazard detection system according to claim 1 or 2,
characterized in that the query voltage (U3) for the status query (ZAZ) is greater than the query voltage (U2) for the regular query (RAZ), and in that the value of the reference voltage (Uref) lies between the two query voltages (U2 and U3) .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87109814T ATE60885T1 (en) | 1986-07-10 | 1987-07-07 | EMERGENCY ALERT SYSTEM. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3623295 | 1986-07-10 | ||
DE3623295 | 1986-07-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0254125A1 true EP0254125A1 (en) | 1988-01-27 |
EP0254125B1 EP0254125B1 (en) | 1991-02-13 |
Family
ID=6304878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87109814A Expired - Lifetime EP0254125B1 (en) | 1986-07-10 | 1987-07-07 | Danger signalling system |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0254125B1 (en) |
AT (1) | ATE60885T1 (en) |
DE (1) | DE3768019D1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0404976A1 (en) * | 1989-06-28 | 1991-01-02 | Siemens Aktiengesellschaft | Method for data transmission in an alarm signalling device |
EP0491216A2 (en) * | 1990-12-18 | 1992-06-24 | Siemens Aktiengesellschaft | Hazard detection system |
FR2717287A1 (en) * | 1994-03-09 | 1995-09-15 | Sicli Automatismes | Surveillance installation operation using sensor network buses |
EP2515553A3 (en) * | 2011-04-21 | 2014-04-30 | Phoenix Contact GmbH & Co. KG | Safety communication system for signalling system conditions |
EP3010000A1 (en) * | 2014-10-17 | 2016-04-20 | Siemens Schweiz AG | System for controlling actuated security devices |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19534344C1 (en) * | 1995-09-15 | 1997-02-27 | Siemens Ag | Hazard indicator system, esp. for fire alarm |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR78472E (en) * | 1960-09-30 | 1962-07-27 | Constr Telephoniques | Improvements to remote signaling and remote control systems |
DE2533354B2 (en) * | 1975-07-25 | 1979-01-04 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Device for transmitting control commands in a fire protection system |
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 |
GB2168517A (en) * | 1984-12-18 | 1986-06-18 | Gent Ltd | Information transmission system |
EP0185175A2 (en) * | 1984-10-31 | 1986-06-25 | Siemens Aktiengesellschaft | Method for the identification transmission of the detectors in a risk-signalling system |
-
1987
- 1987-07-07 AT AT87109814T patent/ATE60885T1/en not_active IP Right Cessation
- 1987-07-07 EP EP87109814A patent/EP0254125B1/en not_active Expired - Lifetime
- 1987-07-07 DE DE8787109814T patent/DE3768019D1/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR78472E (en) * | 1960-09-30 | 1962-07-27 | Constr Telephoniques | Improvements to remote signaling and remote control systems |
DE2533354B2 (en) * | 1975-07-25 | 1979-01-04 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Device for transmitting control commands in a fire protection system |
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 |
EP0185175A2 (en) * | 1984-10-31 | 1986-06-25 | Siemens Aktiengesellschaft | Method for the identification transmission of the detectors in a risk-signalling system |
GB2168517A (en) * | 1984-12-18 | 1986-06-18 | Gent Ltd | Information transmission system |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0404976A1 (en) * | 1989-06-28 | 1991-01-02 | Siemens Aktiengesellschaft | Method for data transmission in an alarm signalling device |
EP0491216A2 (en) * | 1990-12-18 | 1992-06-24 | Siemens Aktiengesellschaft | Hazard detection system |
EP0491216A3 (en) * | 1990-12-18 | 1992-12-09 | Siemens Aktiengesellschaft | Hazard detection system |
FR2717287A1 (en) * | 1994-03-09 | 1995-09-15 | Sicli Automatismes | Surveillance installation operation using sensor network buses |
EP2515553A3 (en) * | 2011-04-21 | 2014-04-30 | Phoenix Contact GmbH & Co. KG | Safety communication system for signalling system conditions |
EP3010000A1 (en) * | 2014-10-17 | 2016-04-20 | Siemens Schweiz AG | System for controlling actuated security devices |
Also Published As
Publication number | Publication date |
---|---|
EP0254125B1 (en) | 1991-02-13 |
ATE60885T1 (en) | 1991-02-15 |
DE3768019D1 (en) | 1991-03-21 |
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