EP0456080B1 - Verfahren und Schaltungsanordnung zur Anzeige von unterschiedlichen Eingangssignalzuständen - Google Patents

Verfahren und Schaltungsanordnung zur Anzeige von unterschiedlichen Eingangssignalzuständen 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
Authority
EP
European Patent Office
Prior art keywords
control signal
input signal
circuit
signal levels
levels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91106956A
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German (de)
English (en)
French (fr)
Other versions
EP0456080A2 (de
EP0456080A3 (en
Inventor
Rudolf Dipl.-Ing. Zeitschek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG Oesterreich
Original Assignee
Siemens AG Oesterreich
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Filing date
Publication date
Application filed by Siemens AG Oesterreich filed Critical Siemens AG Oesterreich
Publication of EP0456080A2 publication Critical patent/EP0456080A2/de
Publication of EP0456080A3 publication Critical patent/EP0456080A3/de
Application granted granted Critical
Publication of EP0456080B1 publication Critical patent/EP0456080B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • 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”.

Landscapes

  • 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)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Testing And Monitoring For Control Systems (AREA)
  • Electric Clocks (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Cookers (AREA)
  • Emergency Alarm Devices (AREA)
EP91106956A 1990-05-11 1991-04-29 Verfahren und Schaltungsanordnung zur Anzeige von unterschiedlichen Eingangssignalzuständen Expired - Lifetime EP0456080B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1046/90 1990-05-11
AT0104690A AT398859B (de) 1990-05-11 1990-05-11 Schaltung für die überwachung und betätigung eines meldeorgans

Publications (3)

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

Family

ID=3505417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91106956A Expired - Lifetime EP0456080B1 (de) 1990-05-11 1991-04-29 Verfahren und Schaltungsanordnung zur Anzeige von unterschiedlichen Eingangssignalzuständen

Country Status (9)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2689279A1 (fr) * 1992-03-27 1993-10-01 Cegelec Appareil de surveillance et d'alarme pour installation de contrôle/commande.

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 (da) * 1973-01-27 1974-11-29
GB1447291A (en) * 1973-08-04 1976-08-25 Honeywell Ltd Logic level testers
DE2350362B2 (de) * 1973-10-08 1975-07-31 Siemens Ag, 1000 Berlin Und 8000 Muenchen Grenzwertmelder für impulsbetriebene Schaltungen
DE2451872C2 (de) * 1974-10-31 1976-10-21 Siemens Ag Schaltungsanordnung zur pegelueberwachung
DE2455656B1 (de) * 1974-11-25 1975-09-11 Siemens Ag Schwellwertstufe
DE2729108C3 (de) * 1977-06-28 1980-03-13 Siemens Ag, 1000 Berlin Und 8000 Muenchen Schaltungsanordnung zur Erkennung von Taktsignalen und zur Umwandlung in digitale Dauersignale
US4307389A (en) * 1980-04-25 1981-12-22 Ford Motor Company Decoding circuit
DE3147742A1 (de) * 1981-12-02 1983-06-09 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zum ueberwachen des auftretens eines alarmsignals auf einer meldeleitung
DE3346527A1 (de) * 1983-12-22 1985-07-04 Siemens AG, 1000 Berlin und 8000 München Verfahren und anordnung zur stoerungssicheren alarmauswertung einer meldelinie einer gefahrenmeldeanlage

Also Published As

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

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