EP0456080B1 - Indication method and circuit of different input signals - Google Patents

Indication method and circuit of different input signals Download PDF

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Publication number
EP0456080B1
EP0456080B1 EP91106956A EP91106956A EP0456080B1 EP 0456080 B1 EP0456080 B1 EP 0456080B1 EP 91106956 A EP91106956 A EP 91106956A EP 91106956 A EP91106956 A EP 91106956A EP 0456080 B1 EP0456080 B1 EP 0456080B1
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Prior art keywords
control signal
input signal
circuit
signal levels
levels
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German (de)
French (fr)
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EP0456080A2 (en
EP0456080A3 (en
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Rudolf Dipl.-Ing. Zeitschek
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Siemens AG Oesterreich
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Siemens AG Oesterreich
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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
    • G08B29/02—Monitoring continuously signalling or alarm systems

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  • the invention relates to a method for displaying and monitoring three different input signal states, "ON”, “OFF” and “FLASHING” of a signaling device, such as a lamp or a bell, preferably for the control room of an electrical system, the display of the input signal states by An electrical control signal is switched on, off and cyclically by a control device and this control signal is fed to a monitoring circuit for monitoring the present input signal state.
  • a signaling device such as a lamp or a bell
  • the invention further relates to a circuit arrangement for performing this method.
  • DE-AS-2 729 108 describes a circuit arrangement for detecting the signal states, "continuous light”, “flickering clock” and “lamp off” of a clock line, in which the clock line is connected to a non-inverting and an inverting input of two AND gates to which a clock generator is connected. The outputs of these two AND gates are each connected to a flip-flop via a shift register, the output states of which indicate the state of the clock line.
  • the control signal of the clock line comprises two control signal levels, one of which signals the "lamp off” state and the other the “permanent light” state.
  • the "flicker clock” state is represented by cyclical switching of these two control signal levels.
  • a disadvantage of this circuit arrangement is the fact that the state of the clock line can only be recognized with a certain delay due to the shift register. This circuit arrangement cannot be used in particular in time-critical processes in which the state of the clock line must be recognized immediately and reacted to immediately.
  • DE-OS-3 346 527 discloses a method and an arrangement for fail-safe alarm evaluation of an alarm line.
  • the deviation from the idle value of a detection line is determined using a window discriminator, it being irrelevant whether the deviation is positive or negative. Only a single signal is thus derived from the signal state of the zone.
  • DE-OS-3 147 742 describes a device for monitoring the occurrence of an alarm signal on a signaling line. It essentially consists of two comparators, at the inputs of which the signal line and a threshold value signal are connected, the outputs of these comparators being logically linked to one another in a single output signal.
  • US Pat. No. 3,922,569 discloses an inverter circuit consisting of an n- and a p-MOSFET, the threshold voltage of which is determined by the ratio of the source-drain conductance values of these MOSFETs.
  • Two output signals can be obtained by means of two such inverter circuits, at the input of which a signal to be monitored is connected. Using this circuit, for example, the defect of one of two electric lamps can be determined and reported.
  • this document does not describe a method which is used to display or monitor three states, such as "ON”, "OFF” and "FLASHING".
  • US Pat. No. 3,944,921 describes a test sensor for determining a voltage at a specific point in a digital electronic circuit, in which, depending on the signal level, the input signal is logically combined with one of two oscillator frequencies to form a single output signal, which is transmitted via a loudspeaker is audible.
  • the logic signal level high or low, can be identified from the frequency of this output signal. If there is no contact between the electronic circuit and the sensor, no audible signal is emitted. No flashing condition can be detected using this test probe either.
  • the invention is based on the object of specifying a method which enables a rapid and reliable display and monitoring of an input state.
  • This object is achieved on the basis of the method mentioned at the outset by assigning two control signal levels to the input signal state "FLASHING", which are above a control signal level for the input signal state "OFF” and below a control signal level for the input signal state "ON”, the signaling device being present of the two higher control signal levels is switched on and is switched off when the two lower control signal levels are present. Furthermore, the control signal is compared by the monitoring circuit with two different threshold values, one between the two higher control signal levels and the other between the two lower control signal levels, so that the present input signal state can be clearly determined by evaluating these two threshold value comparisons by the monitoring circuit.
  • the signaling device is connected to the output of the control device, which is provided for delivering a control signal with four different control signal levels to the signaling device, with the input signal state "FLASHING" being assigned two control signal levels which are above a control signal level for the input signal state "OFF” and below a control signal level for the input signal state "ON".
  • the monitoring circuit has two threshold value circuits connected to the output of the control device, to which two different threshold values are assigned, one between the two higher control signal levels and the other between the two lower control signal levels, the outputs of the threshold value circuits having the input one in the Monitoring circuit provided evaluation circuit for evaluating the threshold value comparisons is connected.
  • the signaling element is a lamp, the control signal levels being selected such that the lamp does not light when the two lower control signal levels are present and lights up when the two higher control signal levels are present.
  • Each threshold value output combination thus clearly represents an input signal state, and the "FLASHING" state is thus also distinguished from the other two states at all times.
  • FIG. 2 shows a diagram of an exemplary course of the level of the electrical control signal in a circuit according to FIG. 1.
  • the diagram is divided into three different time periods T1, T2, T3.
  • the lowest control signal level U1 is present during the first period T1. This causes the message organ 2 to be switched off.
  • T2 there is a difference between the second lowest control signal level U2 and the second highest control signal level U3 Cyclically switched over, signaling device 2 "flashes".
  • the signaling device is switched on by the highest control signal level U4.
  • a first threshold value S1 lies between the highest control signal level U4 and the second highest control signal level U3.
  • a second threshold value S2 lies between the second lowest control signal level U2 and the lowest control signal level U1.
  • this second threshold value S2 it is possible to differentiate between the input signal state "OFF” and the two other input signal states “FLASHING” and "ON”.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electronic Switches (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Testing And Monitoring For Control Systems (AREA)
  • Cookers (AREA)
  • Emergency Alarm Devices (AREA)
  • Electric Clocks (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

A method and a circuit are described for indicating different input signal states, in which a signalling device is activated or de-activated continuously or intermittently. This happens in such a way that levels (U2, U3) are provided for intermittent operation which differ from the levels for continuous activation (U4) or de-activation (U1). <IMAGE>

Description

Gegenstand der Erfindung ist ein Verfahren zur Anzeige und Überwachung dreier unterschiedlicher Eingangssignalzustände, "EIN", "AUS" und "BLINKEN" eines Meldeorgans, wie beispielsweise einer Lampe oder einer Klingel, vorzugsweise für die Schaltwarte einer elektrischen Anlage, wobei die Anzeige der Eingangssignalzustände durch Ein-, Aus- und zyklisches Umschalten eines elektrischen Steuersignals durch eine Steuereinrichtung erfolgt und dieses Steuersignal zur Überwachung des vorliegenden Eingangssignalzustandes einer Überwachungsschaltung zugeführt wird.The invention relates to a method for displaying and monitoring three different input signal states, "ON", "OFF" and "FLASHING" of a signaling device, such as a lamp or a bell, preferably for the control room of an electrical system, the display of the input signal states by An electrical control signal is switched on, off and cyclically by a control device and this control signal is fed to a monitoring circuit for monitoring the present input signal state.

Weiters betrifft die Erfindung eine Schaltungsanordnung zur Durchführung dieses Verfahrens.The invention further relates to a circuit arrangement for performing this method.

Die Steuerung technischer Anlagen und Prozesse durch den Menschen erfordert die leicht unterscheidbare und eindringliche Darstellung bestimmter Anlagen- oder Prozeßzustände. Dies geschieht mit akustischen und/oder optischen Meldeorganen, wie Lampen oder Läutwerken. Für kritische Zustände, die rasches Eingreifen des Bedienpersonals erfordern, wählt man eine besonders eindringliche Darstellung durch periodisches Ein- und Ausschalten des Meldeorgans, während die ordnungsgemäße Funktion vorwiegend durch einen Dauerzustand eines Meldeorganes dargestellt wird. In vielen Fällen ist es überdies notwendig, den Zustand der Meldeorgane mit geeigneten Systemen zu überwachen und gegebenenfalls automatische Steuerungseingriffe durchzuführen.The control of technical systems and processes by humans requires the easily distinguishable and haunting representation of certain system or process states. This is done with acoustic and / or optical signaling devices, such as lamps or chimes. For critical conditions that require rapid intervention by the operating personnel, a particularly haunting representation is selected by periodically switching the signaling element on and off, while the proper function is mainly represented by a permanent state of a signaling element. In many cases it is also necessary to monitor the status of the signaling devices with suitable systems and, if necessary, to carry out automatic control interventions.

In der DE-AS-2 729 108 ist eine Schaltungsanordnung zur Erkennung der Signalzustände, "Dauerlicht", "Flackertakt" und "Lampe aus" einer Taktleitung beschrieben, bei welcher die Taktleitung an einen nicht invertierenden und einen invertierenden Eingang zweier UND-Glieder gelegt ist, an denen ein Taktgenerator angeschlossen ist. Die Ausgänge dieser zwei UND-Glieder sind über je ein Schieberegister mit je einem Flip-Flop verbunden, deren Ausgangszustände den Zustand der Taktleitung angeben. Das Steuersignal der Taktleitung umfaßt zwei Steuersignalpegel, von denen einer den Zustand "Lampe aus" und der andere den Zustand "Dauerlicht" signalisiert. Der Zustand "Flackertakt" wird durch zyklisches Umschalten dieser beiden Steuersignalpegel dargestellt.DE-AS-2 729 108 describes a circuit arrangement for detecting the signal states, "continuous light", "flickering clock" and "lamp off" of a clock line, in which the clock line is connected to a non-inverting and an inverting input of two AND gates to which a clock generator is connected. The outputs of these two AND gates are each connected to a flip-flop via a shift register, the output states of which indicate the state of the clock line. The control signal of the clock line comprises two control signal levels, one of which signals the "lamp off" state and the other the "permanent light" state. The "flicker clock" state is represented by cyclical switching of these two control signal levels.

Ein Nachteil dieser Schaltungsanordnung ist darin zu sehen, daß der Zustand der Taktleitung aufgrund der Schieberegister erst mit einer bestimmten Verzögerung erkannt werden kann. Insbesondere bei zeitkritischen Vorgängen, bei welchen der Zustand der Taktleitung sofort erkannt und darauf unverzüglich reagiert werden muß, kann diese Schaltungsanordnung nicht eingesetzt werden.A disadvantage of this circuit arrangement is the fact that the state of the clock line can only be recognized with a certain delay due to the shift register. This circuit arrangement cannot be used in particular in time-critical processes in which the state of the clock line must be recognized immediately and reacted to immediately.

Aus der DE-OS-3 346 527 sind ein Verfahren und eine Anordnung zur störungssicheren Alarmauswertung einer Meldelinie bekannt. Dabei wird die Abweichung vom Ruhewert einer Meldelinie mittels eines Fensterdiskriminators festgestellt, wobei unerheblich ist, ob die Abweichung positiv oder negativ ist. Aus dem Signalzustand der Meldelinie wird somit nur ein einziges Meldesignal abgeleitet.DE-OS-3 346 527 discloses a method and an arrangement for fail-safe alarm evaluation of an alarm line. The deviation from the idle value of a detection line is determined using a window discriminator, it being irrelevant whether the deviation is positive or negative. Only a single signal is thus derived from the signal state of the zone.

Weiters ist in der DE-OS-3 147 742 eine Vorrichtung zum Überwachen des Auftretens eines Alarmsignals auf einer Meldeleitung beschrieben. Sie besteht im wesentlichen aus zwei Komparatoren, an deren Eingänge die Meldeleitung und je ein Schwellwertsignal gelegt ist, wobei die Ausgänge dieser Komparatoren logisch miteinander in ein ein einziges Ausgangssignal verknüpft sind.Furthermore, DE-OS-3 147 742 describes a device for monitoring the occurrence of an alarm signal on a signaling line. It essentially consists of two comparators, at the inputs of which the signal line and a threshold value signal are connected, the outputs of these comparators being logically linked to one another in a single output signal.

Mittels der zwei oben genannten Vorrichtungen ist jedoch keine Überwachung von drei verschiedenen Eingangssignalzuständen möglich, sodaß sie zur Durchführung des eingangs genannten Verfahrens nicht geeignet sind.However, by means of the two devices mentioned above, monitoring of three different input signal states is not possible, so that they are not suitable for carrying out the method mentioned at the beginning.

Aus der US-PS 3 922 569 geht eine Inverterschaltung, bestehend aus einem n- und einem p-MOSFET hervor, deren Schwellenspannung durch das Verhältnis der Source-Drain Leitwerte dieser MOSFETS bestimmt ist. Mittels zweier solcher Inverterschaltungen, an deren Eingang ein zu überwachendes Signal gelegt ist, können zwei Ausgangssignale erhalten werden. Anhand dieser Schaltung kann beispielsweise der Defekt einer von zwei elektrischen Lampen festgestellt und gemeldet werden. In dieser Druckschrift ist jedoch kein Verfahren beschrieben, welches zur Anzeige bzw. Überwachung von drei Zuständen, wie "EIN", "AUS" und "BLINKEN", dient.US Pat. No. 3,922,569 discloses an inverter circuit consisting of an n- and a p-MOSFET, the threshold voltage of which is determined by the ratio of the source-drain conductance values of these MOSFETs. Two output signals can be obtained by means of two such inverter circuits, at the input of which a signal to be monitored is connected. Using this circuit, for example, the defect of one of two electric lamps can be determined and reported. However, this document does not describe a method which is used to display or monitor three states, such as "ON", "OFF" and "FLASHING".

Weiters ist in der US-PS 3 944 921 ein Testfühler zum Feststellen einer Spannung an einem bestimmten Punkt einer digitalen elektronischen Schaltung beschrieben, bei welchem das Eingangssignal je nach Signalpegel mit einer von zwei Oszillatorfrequenzen logisch zu einem einzigen Ausgangssignal verknüpft wird, welches über einen Lautsprecher hörbar ist. Anhand der Frequenz dieses Ausgangssignals ist der logische Signalpegel, high oder low, erkennbar. Wenn kein Kontakt zwischen der elektronischen Schaltung und dem Fühler besteht, wird kein hörbares Signal abgegeben. Auch mittels dieses Testfühlers ist kein Blinkzustand erfaßbar.Furthermore, US Pat. No. 3,944,921 describes a test sensor for determining a voltage at a specific point in a digital electronic circuit, in which, depending on the signal level, the input signal is logically combined with one of two oscillator frequencies to form a single output signal, which is transmitted via a loudspeaker is audible. The logic signal level, high or low, can be identified from the frequency of this output signal. If there is no contact between the electronic circuit and the sensor, no audible signal is emitted. No flashing condition can be detected using this test probe either.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren anzugeben, welches eine rasche und sichere Anzeige und Überwachung eines Eingangszustandes ermöglicht.The invention is based on the object of specifying a method which enables a rapid and reliable display and monitoring of an input state.

Diese Aufgabe wird ausgehend von dem eingangs angeführten Verfahren dadurch gelöst, daß dem Eingangssignalzustand "BLINKEN" zwei Steuersignalpegel zugeordnet sind, welche oberhalb eines Steuersignalpegels für den Eingangssignalzustand "AUS" und unterhalb eines Steuersignalpegels für den Eingangssignalzustand "EIN" liegen, wobei das Meldeorgan bei Vorliegen der beiden höheren Steuersignalpegel eingeschaltet und bei Vorliegen der beiden niedrigeren Steuersignalpegel ausgeschaltet ist. Weiters wird das Steuersignal durch die Überwachungsschaltung mit zwei unterschiedlichen Schwellwerten verglichen, von denen einer zwischen den zwei höheren Steuersignalpegel und der andere zwischen den zwei niedrigeren Steuersignalpegel liegt, sodaß der vorliegende Eingangssignalzustand durch Auswerten dieser zwei Schwellwertvergleiche durch die Überwachungsschaltung eindeutig bestimmt werden kann.This object is achieved on the basis of the method mentioned at the outset by assigning two control signal levels to the input signal state "FLASHING", which are above a control signal level for the input signal state "OFF" and below a control signal level for the input signal state "ON", the signaling device being present of the two higher control signal levels is switched on and is switched off when the two lower control signal levels are present. Furthermore, the control signal is compared by the monitoring circuit with two different threshold values, one between the two higher control signal levels and the other between the two lower control signal levels, so that the present input signal state can be clearly determined by evaluating these two threshold value comparisons by the monitoring circuit.

Durch diese erfindungsgemäßen Maßnahmen kann ein bestimmter aus den drei möglichen Eingangszuständen unverzüglich und eindeutig erkannt werden, wodurch in vorteilhafter Weise eine sichere und effiziente Überwachung dieser Zustände ermöglicht wird.Through these measures according to the invention, a specific one of the three possible input states can be recognized immediately and unambiguously, which advantageously enables safe and efficient monitoring of these states.

Weiters ist es eine Aufgabe der Erfindung, eine zur Ausführung dieses Verfahrens geeignete Vorrichtung zu schaffen.Furthermore, it is an object of the invention to provide a device which is suitable for carrying out this method.

Diese Aufgabe wird dadurch gelöst, daß das Meldeorgan an den Ausgang der Steuereinrichtung angeschlossen ist, welche zur Abgabe eines Steuersignals mit vier unterschiedlichen Steuersignalpegel an das Meldeorgan vorgesehen ist, wobei dem Eingangssignalzustand "BLINKEN" zwei Steuersignalpegel zugeordnet sind, welche oberhalb eines Steuersignalpegels für den Eingangssignalzustand "AUS" und unterhalb eines Steuersignalpegels für den Eingangssignalzustand "EIN" liegen. Weiters weist die Überwachungsschaltung zwei an den Ausgang der Steuereinrichtung angeschlossene Schwellwertschaltungen auf, welchen zwei unterschiedliche Schwellwerte zugeordnet sind, von denen einer zwischen den zwei höheren Steuersignalpegel und der andere zwischen den zwei niedrigeren Steuersignalpegel liegt, wobei die Ausgänge der Schwellwertschaltungen mit dem Eingang einer in der Überwachungsschaltung vorgesehenen Auswerteschaltung zum Auswerten der Schwellwertvergleiche verbunden ist.This object is achieved in that the signaling device is connected to the output of the control device, which is provided for delivering a control signal with four different control signal levels to the signaling device, with the input signal state "FLASHING" being assigned two control signal levels which are above a control signal level for the input signal state "OFF" and below a control signal level for the input signal state "ON". Furthermore, the monitoring circuit has two threshold value circuits connected to the output of the control device, to which two different threshold values are assigned, one between the two higher control signal levels and the other between the two lower control signal levels, the outputs of the threshold value circuits having the input one in the Monitoring circuit provided evaluation circuit for evaluating the threshold value comparisons is connected.

Bei einer bevorzugten Ausführungsform der Erfindung ist das Meldeorgan eine Lampe, wobei die Steuersignalpegel so gewählt sind, daß die Lampe bei Anliegen der zwei niedrigeren Steuersignalpegel nicht leuchtet und bei Anliegen der zwei höheren Steuersignalpegel leuchtet.In a preferred embodiment of the invention, the signaling element is a lamp, the control signal levels being selected such that the lamp does not light when the two lower control signal levels are present and lights up when the two higher control signal levels are present.

Die Erfindung wird im folgenden anhand zweier Figuren näher erläutert, die zeigen:

  • Fig. 1 ein Ausführungsbeispiel für eine erfindungsgemäße Schaltungsanordnung,
  • Fig. 2 einen beispielhaften Verlauf des am Meldeorgan anliegenden Steuersignalpegels.
The invention is explained in more detail below with reference to two figures, which show:
  • 1 shows an embodiment for a circuit arrangement according to the invention,
  • Fig. 2 shows an exemplary course of the control signal level applied to the signaling element.

Die in Figur 1 dargestellte Schaltungsanordnung besteht aus einer Steuereinrichtung 1, einer Lampe als Meldeorgan 2 und einer Überwachungsschaltung, bestehend aus zwei Schwellwertschaltungen 3, 4 und einer Auswerteschaltung 5. Die Funktion der Schaltungsanordnung kann man sich wie folgt vorstellen: Die drei unterschiedlichen mit "EIN", "AUS" und "BLINKEN" bezeichneten Signalzustände des Eingangssignals EG werden von der Steuereinrichtung 1 mittels einer Spannung an ihrem Steuerausgang AG dargestellt. Der Zustand "EIN" wird durch eine dauerhafte Spannung vom Wert 10 V, der Zustand "AUS" durch eine dauerhafte Spannung vom Wert 0 V und der Zustand "BLINKEN" durch eine intermittierende Spannungsfolge mit den beiden Werten 9 V und 1 V dargestellt. Die an den Steuerausgang AG angeschlossene Lampe 2 mit einem nichtlinearen Zusammenhang zwischen angelegter Spannung und abgegebener Strahlung leuchtet bei Anliegen einer Spannung von 9 V oder 10 V und bleibt bei einem anliegenden Spannungswert von 1 V oder 0 V dunkel. Die beiden ebenfalls an den Steuerausgang AG der Steuereinrichtung 1 angeschlossene Schwellwertschaltungen 3, 4 weisen unterschiedliche Schwellwerte von 9,5 V bzw. 0,5 V auf. Durch die logische Verknüpfung ihrer Ausgänge mittels der Auswerteschaltung 5 wird der Signalzustand des Eingangssignales EG bestimmt. Es sind folgende Schwellwertausgangskombinationen möglich:

Eingangssignalzustand "EIN":
Schwellwertschaltung 3 (9,5 V): Ein
Schwellwertschaltung 4 (0,5 V): Ein
Eingangssignalzustand "AUS":
Schwellwertschaltung 3: Aus
Schwellwertschaltung 4: Aus
Eingangssignalzustand "BLINKEN":
Schwellwertschaltung 3: Aus
Schwellwertschaltung 4: Ein
The circuit arrangement shown in Figure 1 consists of a control device 1, a lamp as a signaling element 2 and a monitoring circuit consisting of two threshold value circuits 3, 4 and an evaluation circuit 5. The function of the circuit arrangement can be imagined as follows: The three different ones with "ON "," OFF "and" FLASHING "designated signal states of the input signal EG are applied by the control device 1 by means of a voltage their control output AG shown. The "ON" state is represented by a permanent voltage of 10 V, the "OFF" state by a permanent voltage of 0 V and the "FLASHING" state by an intermittent voltage sequence with the two values 9 V and 1 V. The lamp 2 connected to the control output AG with a non-linear relationship between the applied voltage and the emitted radiation lights up when a voltage of 9 V or 10 V is applied and remains dark when a voltage value of 1 V or 0 V is present. The two threshold value circuits 3, 4 also connected to the control output AG of the control device 1 have different threshold values of 9.5 V and 0.5 V, respectively. The logic state of their outputs by means of the evaluation circuit 5 determines the signal state of the input signal EG. The following threshold value output combinations are possible:
Input signal state "ON":
Threshold circuit 3 (9.5 V): On
Threshold circuit 4 (0.5 V): On
Input signal state "OFF":
Threshold circuit 3: Off
Threshold circuit 4: Off
Input signal state "FLASHING":
Threshold circuit 3: Off
Threshold circuit 4: On

Jede Schwellwertausgangskombination stellt somit eindeutig einen Eingangssignalzustand dar, auch der Zustand "BLINKEN" wird damit zu jedem Zeitpunkt von den beiden anderen Zuständen unterschieden.Each threshold value output combination thus clearly represents an input signal state, and the "FLASHING" state is thus also distinguished from the other two states at all times.

Figur 2 zeigt in einem Diagramm einen beispielhaften Verlauf des Pegels des elektrischen Steuersignals in einer Schaltung nach Fig. 1. Das Diagramm gliedert sich in drei unterschiedliche Zeiträume T1,T2,T3. Während dem ersten Zeitraum T1 liegt der niedrigste Steuersignalpegel U1 vor. Dieser bewirkt, daß das Meldeorgan 2 ausgeschaltet ist. Während dem darauffolgenden zweiten Zeitraum T2 wird zwischen dem zweitniedrigsten Steuersignalpegel U2 und dem zweithöchsten Steuersignalpegel U3 zyklisch umgeschaltet, das Meldeorgan 2 "blinkt". Während dem dritten Zeitraum T3 wird das Meldeorgan durch den höchsten Steuersignalpegel U4 eingeschaltet. Ein erster Schwellwert S1 liegt wertmäßig zwischen dem höchsten Steuersignalpegel U4 und dem zweithöchsten Steuersignalpegel U3. Mit Hilfe dieses ersten Schwellwertes S1 ist eine Unterscheidung zwischen dem Eingangssignalzustand "EIN" und den beiden anderen Eingangssignalzuständen "BLINKEN" und "AUS" möglich. Ein zweiter Schwellwert S2 liegt wertmäßig zwischen dem zweitniedrigsten Steuersignalpegel U2 und dem niedrigsten Steuersignalpegel U1. Mit Hilfe dieses zweiten Schwellwertes S2 ist eine Unterscheidung zwischen dem Eingangssignalzustand "AUS" und den beiden anderen Eingangssignalzuständen "BLINKEN" und "EIN" möglich. Durch Kombination der beiden Unterscheidungsergebnisse ist zu jedem Zeitpunkt eine eindeutige Bewertung des Eingangssignalzustandes möglich.FIG. 2 shows a diagram of an exemplary course of the level of the electrical control signal in a circuit according to FIG. 1. The diagram is divided into three different time periods T1, T2, T3. The lowest control signal level U1 is present during the first period T1. This causes the message organ 2 to be switched off. During the subsequent second time period T2 there is a difference between the second lowest control signal level U2 and the second highest control signal level U3 Cyclically switched over, signaling device 2 "flashes". During the third period T3, the signaling device is switched on by the highest control signal level U4. In terms of value, a first threshold value S1 lies between the highest control signal level U4 and the second highest control signal level U3. With the aid of this first threshold value S1 it is possible to differentiate between the input signal state "ON" and the two other input signal states "FLASHING" and "OFF". In terms of value, a second threshold value S2 lies between the second lowest control signal level U2 and the lowest control signal level U1. With the aid of this second threshold value S2, it is possible to differentiate between the input signal state "OFF" and the two other input signal states "FLASHING" and "ON". By combining the two differentiation results, an unambiguous evaluation of the input signal state is possible at any time.

Claims (3)

  1. Method for indicating and monitoring three different input signal conditions, "ON', "OFF" and "INTERMITTENT", of a signalling device (2), such as, for example, a light or a bell, preferably for the control station of an electrical installation, wherein the input signal conditions are indicated by switching an electric control signal on, off and cyclically by means of a control device (1) and in order to monitor the current input signal condition this control signal is supplied to a monitoring circuit (3, 4, 5), characterised in that two control signal levels (U2, U3) are allocated to the "INTERMITTENT" input signal condition and are above a control signal level (U1) for the "OFF" input signal condition and below a control signal level (U4) for the "ON" input signal condition, wherein the signalling device (2) is switched on in the presence of the two higher control signal levels (U3, U4) and switched off in the presence of the two lower control signal levels (U1, U2), that the control signal is compared by the monitoring circuit (3, 4, 5) with two different threshold values (S1, S2), of which one (S2) lies between the two higher control signal levels (U3, U4) and the other (S1) between the two lower control signal levels (U1, U2) and that the current input signal condition is determined by the evaluation of these threshold value comparisons.
  2. Circuit arrangement for carrying out the method according to claim 1, characterised in that the signalling device (2) is connected to the output of the control device (1), which is provided in order to give out a control signal with four different control signal levels (U1, U2, U3, U4) to the signalling device (2), wherein two control signal levels (U2, U3) are allocated to the "INTERMITTENT" input signal condition and are above a control signal level (U1) for the "OFF" input signal condition and below a control signal level (U4) for the "ON" input signal condition, that the monitoring circuit (3, 4, 5) comprises two threshold value circuits (3, 4) connected to the output of the control device (1) and to which two different threshold values (S1, S2) are allocated of which one (S2) lies between the two higher control signal levels (U3, U4) and the other (S1) between the two lower control signal levels (U1, U2) and that the outputs of the threshold value circuits (3, 4) are connected to the input of an evaluation circuit (5) provided in the monitoring circuit (3, 4, 5) in order to evaluate the threshold value comparisons.
  3. Circuit arrangement according to claim 2, characterised in that the signalling device (2) is a light and the control signal levels (U1, U2, U3, U4) are selected such that the light is not illuminated in the presence of the two lower control signal levels (U1, U2) and is illuminated in the presence of the two higher control signal levels (U3, U4).
EP91106956A 1990-05-11 1991-04-29 Indication method and circuit of different input signals Expired - Lifetime EP0456080B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1046/90 1990-05-11
AT0104690A AT398859B (en) 1990-05-11 1990-05-11 CIRCUIT FOR MONITORING AND OPERATING A NOTIFICATION ORGAN

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EP0456080A2 EP0456080A2 (en) 1991-11-13
EP0456080A3 EP0456080A3 (en) 1993-06-16
EP0456080B1 true EP0456080B1 (en) 1996-09-11

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EP (1) EP0456080B1 (en)
AT (2) AT398859B (en)
DE (1) DE59108160D1 (en)
DK (1) DK0456080T3 (en)
DZ (1) DZ1500A1 (en)
ES (1) ES2094167T3 (en)
GR (1) GR3021921T3 (en)
MA (1) MA22148A1 (en)
TN (1) TNSN91034A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2689279A1 (en) * 1992-03-27 1993-10-01 Cegelec Monitoring and alarm device for control / command installation.

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3944921A (en) * 1970-12-11 1976-03-16 Canon Kabushiki Kaisha Logic level test probe with grated oscillator
JPS49125066A (en) * 1973-01-27 1974-11-29
GB1447291A (en) * 1973-08-04 1976-08-25 Honeywell Ltd Logic level testers
DE2350362B2 (en) * 1973-10-08 1975-07-31 Siemens Ag, 1000 Berlin Und 8000 Muenchen Limit indicator for pulse-operated circuits
DE2451872C2 (en) * 1974-10-31 1976-10-21 Siemens Ag CIRCUIT ARRANGEMENT FOR LEVEL MONITORING
DE2455656B1 (en) * 1974-11-25 1975-09-11 Siemens Ag Threshold level
DE2729108C3 (en) * 1977-06-28 1980-03-13 Siemens Ag, 1000 Berlin Und 8000 Muenchen Circuit arrangement for recognizing clock signals and for converting them into digital continuous signals
US4307389A (en) * 1980-04-25 1981-12-22 Ford Motor Company Decoding circuit
DE3147742A1 (en) * 1981-12-02 1983-06-09 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for monitoring the occurrence of an alarm signal on an alarm line
DE3346527A1 (en) * 1983-12-22 1985-07-04 Siemens AG, 1000 Berlin und 8000 München METHOD AND ARRANGEMENT FOR THE FAULT-SAFE ALARM EVALUATION OF A DETECTING LINE OF A DANGER DETECTING SYSTEM

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DE59108160D1 (en) 1996-10-17
EP0456080A2 (en) 1991-11-13
GR3021921T3 (en) 1997-03-31
ATE142809T1 (en) 1996-09-15
AT398859B (en) 1995-02-27
ATA104690A (en) 1994-06-15
MA22148A1 (en) 1991-12-31
DZ1500A1 (en) 2004-09-13
EP0456080A3 (en) 1993-06-16
TNSN91034A1 (en) 1992-10-25
ES2094167T3 (en) 1997-01-16
DK0456080T3 (en) 1997-02-17

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