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EP0056099B1 - Supervisory apparatus for remote-control systems - Google Patents

Supervisory apparatus for remote-control systems Download PDF

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Publication number
EP0056099B1
EP0056099B1 EP81109263A EP81109263A EP0056099B1 EP 0056099 B1 EP0056099 B1 EP 0056099B1 EP 81109263 A EP81109263 A EP 81109263A EP 81109263 A EP81109263 A EP 81109263A EP 0056099 B1 EP0056099 B1 EP 0056099B1
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EP
European Patent Office
Prior art keywords
central station
telegram
criterion
monitoring device
address
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
Application number
EP81109263A
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German (de)
French (fr)
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EP0056099A2 (en
EP0056099A3 (en
Inventor
Otto Ing. Grad. Lang
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
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Siemens AG
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Application filed by Siemens AG filed Critical Siemens AG
Priority to AT81109263T priority Critical patent/ATE17895T1/en
Publication of EP0056099A2 publication Critical patent/EP0056099A2/en
Publication of EP0056099A3 publication Critical patent/EP0056099A3/en
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C25/00—Arrangements for preventing or correcting errors; Monitoring arrangements

Definitions

  • the invention relates to a monitoring device for telecontrol devices with at least one central station and with substations, the stations exchanging information over a common transmission path by means of pulse telegrams that follow one another in time, and the pulse telegrams contain an address part, an information part and a differentiation criterion, depending on whether the relevant one Pulse telegram comes from a central station or substation, is a central station telegram criterion or a substation telegram criterion and the query telegram and the associated response telegram each have the same address and the monitoring device that can be connected to the transmission link has an evaluation device for evaluating the address and the transmitted pulse telegrams on the transmission link Distinguishing criterion contains.
  • the pulse telegrams can be used in addition to the address part, information part and differentiation criterion, e.g. have a synchronous character, a security attachment and / or the like.
  • Such a monitoring device is already known from DE-A-2 516 681.
  • the known monitoring device is used to monitor substations of a telecontrol device in which a central station is connected to the substations via a transmission link and the
  • the query cycle In addition to collecting all messages from the telecontrol network, the query cycle also has the task of monitoring the stations and notifying them of their failure or return. In addition to the active central station, there are also passive central stations that only listen and evaluate. They can be switched on anywhere in the network and also indicate a station failure or a station return.
  • the telegrams transmitted in the telecontrol system contain criteria for whether the telegram was sent from a central station or another station. These criteria are processed in an evaluation device.
  • the central station has the address of the called substation in its telegram.
  • the called substation has its own address in its telegram. These addresses are also evaluated in the evaluation device.
  • the evaluation device each has an output for the central station telegram criterion, the substation telegram criterion and the address of the relevant central station or substation.
  • a monitoring arrangement processes the criteria or addresses given by the evaluation device and thereby wins failure criteria regarding the failure of a substation.
  • One criterion that indicates that a substation has failed is that the central station transmits twice without receiving a substation in between.
  • the contents from the corresponding counters or memories of the telecontrol center can be displayed. If the control center is disturbed, the meaningfulness of these displays is very low or the displays themselves are even disturbed. Such a display is therefore not suitable for monitoring the telecontrol center itself.
  • the object of the invention is to design a monitoring device of the type specified above in such a way that the function of at least one central station is monitored with particularly great reliability.
  • One finding within the scope of the invention is that this is expediently carried out in conjunction with an observation of the telecontrol telegrams transmitted on the transmission link.
  • the monitoring device is designed to solve this problem in such a way that the transmission device contains display means for displaying the address and the differentiation criterion and that the differentiation criteria determined by the evaluation device can be monitored by means of a monitoring arrangement in such a way that interruptions in the occurrence of central station telegram criteria that exceed a predetermined time period trigger an alarm signal.
  • the monitoring device can be connected to the transmission link via its own modem or a modem of the central station or a substation.
  • a certain bit of the telecontrol telegram can serve as the differentiation criterion, the logical '1' being the central station criterion and the logical '0' being the substation criterion.
  • the monitoring device is preferably located at the location of the telecontrol center or - if there are several telecontrol centers - at least at the location of one of the telecontrol centers. However, it can also be arranged as a test device at another point on the transmission link.
  • the measures mentioned have the advantage that the telecontrol device can be monitored particularly reliably whether there are central station telegrams at regular intervals on the transmission link formed, in particular, by a line common to all stations. If this is not the case, a failure alarm is issued.
  • the monitoring device is particularly advantageous for telecontrol devices with several central stations, in which an initially active central station is replaced in the event of a fault by a further central station, which changes from the passive to the active state as soon as it no longer receives central telegrams after a certain waiting time. If a monitoring device located at one of such central stations detects that no central station telegrams are being transmitted, it is namely certain that the central station in question has failed itself.
  • the monitoring device can be further perfected in that the monitoring device is spatially adjacent to a central station and that, in addition to the central station telegram criteria, the monitoring arrangement also in the central station Test pulse sequences formed can be monitored in such a way that interruptions in the occurrence of test pulses which exceed a predetermined time period trigger an alarm signal.
  • the monitoring devices of a central station are arranged spatially adjacent and a criterion obtained from the alarm signal is fed as a start signal to the start input of a device for sequence control held in the central station.
  • An automatic start which tries to restart a microcomputer system of the central can be switched on as soon as the central station no longer sends telecontrol telegrams or is flagged as disturbed.
  • such starting attempts consist in resetting a device for sequence control to a zero position, from which it starts automatically.
  • the differentiation criterion can be displayed by means of its own light-emitting diode, which is arranged adjacent to the device for address indication.
  • the monitoring device is expediently designed in such a way that the display means for displaying the telegram address and the differentiation criterion contain a numerical display element with additional characters, in particular a decimal point, and that a control signal derived from the differentiation criterion is fed to the input of the digit display element which is assigned to the additional character.
  • Central station telegrams and substation telegrams can be clearly distinguished from one another in the optical display using particularly simple means, even though the query telegram from the remote control center and the subsequent response telegram from a substation each have the same telegram address.
  • the additional optical character used to distinguish query and response telegram addresses advantageously does not require any special effort. E.g. additional characters such as +, - ,: or the like can be used.
  • the check as to whether central station telegrams are on the line at regular intervals is expediently carried out in that the monitoring arrangement for evaluating the differentiation criterion contains a counter, the clock input of which is connected to a clock generator of the monitoring device, the reset input of which can be acted upon with control signals derived from the central station telegram criteria, and its forwarding can be blocked when a predetermined counter reading is reached.
  • the monitoring of test pulse sequences formed in the central station is expediently achieved in that the monitoring arrangement contains at least one counter, the clock input of which is connected to a clock generator and the reset input of which is connected to the output of a test device contained in the central station, which test pulses at undisturbed operation at regular intervals delivers.
  • the monitoring device is designed such that the monitoring arrangement contains a counter, the clock input of which is connected to a clock generator and the reset input of which can be acted upon by the clock pulses of a clock generator contained in the central station.
  • the further counter advantageously makes it possible to reliably monitor the correspondence between the clock of the remote control center and the clock used in the monitoring. If the additional character of the numerical display element can be controlled by the control signal in such a way that it is activated when the substation telegram criterion is present, the result of the sequence of telecontrol telegrams running over the transmission path is particularly easy to recognize.
  • the clock frequency can be set to the bit repetition frequencies that can be selected in the telecontrol device with regard to its clock frequency.
  • the figure shows a monitoring device which is connected to a central station.
  • the central station 1 is connected to the transmission line 3 via the modem 10.
  • the transmission line 3 connects the central station 1 to the substations and possibly to further central stations, of which only the substation 2 is shown with its modem 20.
  • the telecontrol telegrams transmitted from the central station 1 to the modem 10 or from the modem 10 to the central station 1 are fed to the monitoring device 5 via the decoupling diodes 61, 62.
  • the monitoring device 5 evaluates the data stream.
  • the arrangement 51 contained therein which essentially consists of a shift register controllable by the clock generator 6, receives the pulse telegrams and, after a serial-parallel conversion, forwards them byte by byte to the device 52 for synchronous character evaluation. If the device 52 recognizes a synchronous character, it releases the control device 53.
  • the control device 53 which is connected to the clock generator 6, starts counting the clock pulses from the time of the release and, when a predetermined number of clock pulses is reached, outputs a strobe pulse as a logic '1' to the control circuit 42.
  • the drive circuit 42 which is connected to the arrangement 51 via a seven bit wide address bus, is caused by the strobe pulse to adopt the binary-coded address.
  • the control circuit 42 is used to control the device 41 for numerical display. It contains an address memory and one or more encoders, with the aid of which the control signals required for controlling the device 41 for numerical display are obtained from the binary-coded address information. In an intermediate stage, the address is preferably first converted into the BCD code and then subsequently into the control signals customary for controlling 7-segment display elements.
  • the device 41 for numerical display contains a display element which serves to display a decimal point. This display element is controlled separately via the D flip-flop 54.
  • This D flip-flop 54 is connected to the output of the control device 53 with its clock input and to a connection of the output of the arrangement 51 with its D input.
  • the telecontrol telegrams on which the exemplary embodiment is based are composed of several bytes each with 8 bits.
  • the telecontrol telegram begins with a synchronous byte.
  • Another byte serves as an address byte and consists of a so-called Z-bit, which serves as a differentiation criterion, and seven address bits.
  • the D flip-flop 54 is caused by the strobe pulse of the control device 53 to take over the Z bit and appears at the output of the D flip flop as a control signal for the additional character the device 41 a stored central station telegram criterion Z 'as a logical' 1 '.
  • the monitoring device 5, the clock generator 6 and the control circuit 42 can be constructed in particular with the aid of a small microcomputer system.
  • the monitoring arrangement 7 contains the counters 71, 72 and 73, which are each connected to the clock generator 6 with a clock input. The advance through the clock is blocked when the counter end position is reached in that the output of the counter is connected to an enable input E.
  • the outputs of the counters 71, 72 and 73 are also routed to the inputs of the triple OR element 74, the output of which is routed both to the display device 75 and via the automatic start device 9 to the reset input R of the central station 1.
  • the alarm signals of the counters 71, 72, 73 can be displayed individually or only in part, or can be fed to the automatic start.
  • the counters 71, 72 and 73 designed as binary counters are reset in different ways.
  • the counter 71 is connected with its reset input R to the output of the AND gate 55, which has one input together with the D input of the D flip-flop 54 at a connection of the output of the arrangement 51 and with the other input at the output of the Control device 53 is located.
  • the AND gate 55 queries the Z bit supplied by the arrangement 51 with the aid of the strobe signal emitted by the device 53.
  • the counter 71 is therefore reset with each central station telegram. If central station telegrams are missing during a predetermined period of time, the counter 71 reaches its end position and emits an alarm signal to the OR element 74.
  • the reset inputs of counters 72 and 73 are dynamic inputs that only respond to positive clock edges.
  • the reset input R of the counter 72 is connected to a clock output of the central station 1, which is also connected to a clock input of the modem 10.
  • the counter 72 therefore monitors the clock pulse sequence of the central station 1.
  • the reset input of the counter 73 is connected to a test pulse output S of the central station.
  • the device for sequence control of the central station 1 emits monitoring pulses to the test pulse output at regular intervals, even when another central station sends query telegrams to the transmission link and the central station under consideration must therefore remain passive.
  • control signal Z ' it controls an optical display for identifying the substation telegrams, which is formed by the decimal point of the device 41 for the numerical display. If the Z bit is missing during a certain period of time, the LED of the display device 75 is activated via the OR gate 74 to emit a central alarm. In addition, this alarm causes the automatic start 9 to restart a microprocessor which is used to control the sequence of the control center 1.
  • This automatic start 9 is formed by a clock pulse generator, which emits start pulses at regular time intervals when it is released by an alarm signal via its enable input E.
  • the device 41 for numerical display makes the addresses of the telegrams running via the telecontrol and thus the cycle sequence and the telegram exchange visible.
  • the telegram addresses of the telecontrol telegrams are displayed on the device 41 for numerical display.
  • the decimal point is used to display substation telegrams. The display remains until a new telegram arrives.
  • the monitoring device has its own clock supply which is independent of the sequence control of the central station 1 and, moreover, also detects malfunctions of the sequence control which are caused by a faulty clock.
  • the own clock supply also makes it possible to use the monitoring device as a service and / or test module in the entire telecontrol network to control the exchange of telegrams.
  • the clock generator 6, the device 5 for telegram evaluation and the device 41 with the control circuit 42 are used.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Selective Calling Equipment (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)

Abstract

1. A monitoring device for remote control devices with at least one central station (1) and with subsidiary stations (2) where the stations (2) exchange items of information via a common transmission link (3) by means of time-consecutive pulse telegrams, and the pulse telegrams contain an address component, an information component, and a differentiation criterion which, depending upon whether tha pulse telegram in question emanates from a central station (1) or a subsidiary station (2), is a central station telegram criterion or a subsidiary station telegram criterion, and where both the interrogation telegram and the associated response telegram have the same address, and the monitoring device which can be connected to the transmission link (3) includes analysis device (5) which serves to analyse the pulse telegrams transmitted on the transmission link (3) in respect of their address and differentiation criterion, characterised in that the transmission device includes display means for the display of the address and the differentiation criterion, and that the differentiation criteria which are determined by the analysis device (5) can be monitored by means of a monitoring arrangement (7) in such manner that interruptions, which exceed a predetermined length of time, in the occurrence of central station telegram criteria (Z) trigger an alarm signal.

Description

Die Erfindung bezieht sich auf eine Überwachungseinrichtung für Fernwirkeinrichtungen mit wenigstens einer Zentralstation und mit Unterstationen, wobei die Stationen über eine gemeinsame Übertragungsstrecke mittels zeitlich aufeinanderfolgener Impulstelegramme Informationen austauschen und die Impulstelegramme einen Adressenteil, einen Informationsteil und ein Unterscheidungskriterium enthalten, das je nachdem, ob das betreffende Impulstelegramm von einer Zentralstation oder Unterstation stammt, ein Zentralstationstelegrammkriterium oder ein Unterstations telegrammkriterium ist und wobei jeweils das Abfragetelegramm und das dazugehörige Antworttelegramm die gleiche Adresse haben und die an die Übertragungsstrecke anschließbare Überwachungseinrichtung eine Auswerteeinrichtung zur Auswertung der auf der Übertragungsstrecke übertragenen Impulstelegramme hinsichtlich der Adresse und des Unterscheidungskriteriums enthält. Dabei können die Impulstelegramme zusätzlich zum Adressenteil, Informationsteil und Unterscheidungskriterium, z.B. ein Synchronzeichen, einen Sicherungsanhang und/oder dergleichen aufweisen.The invention relates to a monitoring device for telecontrol devices with at least one central station and with substations, the stations exchanging information over a common transmission path by means of pulse telegrams that follow one another in time, and the pulse telegrams contain an address part, an information part and a differentiation criterion, depending on whether the relevant one Pulse telegram comes from a central station or substation, is a central station telegram criterion or a substation telegram criterion and the query telegram and the associated response telegram each have the same address and the monitoring device that can be connected to the transmission link has an evaluation device for evaluating the address and the transmitted pulse telegrams on the transmission link Distinguishing criterion contains. The pulse telegrams can be used in addition to the address part, information part and differentiation criterion, e.g. have a synchronous character, a security attachment and / or the like.

Eine derartige Überwachungseinrichtung ist bereits aus der DE-A-2 516 681 bekannt. Die bekannte Überwachungseinrichtung dient zur Überwachung von Unterstationen einer Fernwirkeinrichtung, bei der eine Zentralstation über eine Übertragungsstrecke mit den Unterstationen verbunden ist und dieSuch a monitoring device is already known from DE-A-2 516 681. The known monitoring device is used to monitor substations of a telecontrol device in which a central station is connected to the substations via a transmission link and the

Unterstationen zyklisch aufruft. Der Abfragezyklus hat neben dem Einsammeln aller Meldungen des Fernwirknetzes auch die Aufgabe, die Stationen zu überwachen und ihren Ausfall oder ihre Wiederkehr anzuzeigen. Neben der aktiven Zentralstation gibt es auch passive Zentralstationen, die nur mithören und auswerten. Sie können überall in das Netz eingeschaltet werden und zeigen ebenfalls einen Stationsausfall oder eine Stationswiederkehr an.Calls substations cyclically. In addition to collecting all messages from the telecontrol network, the query cycle also has the task of monitoring the stations and notifying them of their failure or return. In addition to the active central station, there are also passive central stations that only listen and evaluate. They can be switched on anywhere in the network and also indicate a station failure or a station return.

Die in der Fernwirkanlage übertragenen Telegramme enthalten Kriterien dafür, ob das Telegramm von einer Zentralstation oder einer anderen Station ausgesandt wurde. Diese Kriterien werden in einer Auswerteeinrichtung verarbeitet. Die Zentralstation hat in ihrem Telegramm die Adresse der aufgerufenen Unterstation. Die aufgerufene Unterstation hat in ihrem Telegramm ihre eigene Adresse. Diese Adressen werden in der Auswerteeinrichtung ebenfalls ausgewertet. Die Auswerteeinrichtung hat je einen Ausgang für das Zentralstationstelegrammkriterium, das Unterstationstelegrammkriterium und die Adresse der betreffenden Zentralstation bzw. Unterstation. Eine Überwachungsanordnung verarbeitet die von der Auswerteeinrichtung abgegebenen Kriterien bzw. Adressen und gewinnt dabei Ausfallkriterien über den Ausfall einer Unterstation. Ein Kriterium, das aussagt, daß eine Unterstation ausgefallen ist, besteht darin, daß die Zentralstation zweimal sendet, ohne dazwischen eine Unterstation zu empfangen.The telegrams transmitted in the telecontrol system contain criteria for whether the telegram was sent from a central station or another station. These criteria are processed in an evaluation device. The central station has the address of the called substation in its telegram. The called substation has its own address in its telegram. These addresses are also evaluated in the evaluation device. The evaluation device each has an output for the central station telegram criterion, the substation telegram criterion and the address of the relevant central station or substation. A monitoring arrangement processes the criteria or addresses given by the evaluation device and thereby wins failure criteria regarding the failure of a substation. One criterion that indicates that a substation has failed is that the central station transmits twice without receiving a substation in between.

Man kann für die Anzeige der Adressen von ausgesendeten oder empfangenen Fernwirktelegrammen die Inhalte aus den entsprechenden Zählern bzw. Speichern der Fernwirkzentrale anzeigen. Ist die Zentrale gestört, so ist der Aussagewert dieser Anzeigen jedoch sehr gering oder die Anzeigen sind sogar selbst gestört. Für eine eigene Überwachung der Fernwirkzentrale ist eine derartige Anzeige somit nicht ohne weiteres geeignet.For the display of the addresses of transmitted or received telecontrol telegrams, the contents from the corresponding counters or memories of the telecontrol center can be displayed. If the control center is disturbed, the meaningfulness of these displays is very low or the displays themselves are even disturbed. Such a display is therefore not suitable for monitoring the telecontrol center itself.

Aufgabe der Erfindung ist es, eine Überwachungseinrichtung der vorstehend näher bezeichneten Art derart auszubilden, daß die Funktion wenigstens einer Zentralstation mit besonders großer Zuverlässigkeit überwacht wird. Eine Erkenntnis im Rahmen der Erfindung besteht darin, daß dies zweckmäßigerweise in Verbindung mit einer Beobachtung der auf der Übertragungsstrecke Übertragenen Fernwirktelegramme geschieht.The object of the invention is to design a monitoring device of the type specified above in such a way that the function of at least one central station is monitored with particularly great reliability. One finding within the scope of the invention is that this is expediently carried out in conjunction with an observation of the telecontrol telegrams transmitted on the transmission link.

Gemäß der Erfindung wird die Überwachungseinrichtung zur Lösung dieser Aufgabe derart ausgebildet, daß die Übertragungseinrichtung Anzeigemittel zur Anzeige der Adresse und des Unterscheidungskriteriums enthält und daß die von der Auswerteeinrichtung ermittelten Unterscheidungskriterien mittels einer Überwachungsanordnung derart überwachbar sind, daß eine vorgegebene Zeitspanne überschreitende Unterbrechungen im Auftreten von Zentralstationstelegrammkriterien ein Alarmsignal auslösen. Die Überwachungseinrichtung kann dabei über ein eigenes Modem oder ein Modem der Zentralstation oder einer Unterstation an die Übertragungsstrecke angeschlossen werden. Als Unterscheidungskriterium kann insbesondere ein bestimmtes Bit des Fernwirktelegrammes dienen, wobei die logische '1' das Zentralstationskriterium und die logische '0' das Unterstationskriterium ist. Vorzugsweise befindet sich die Überwachungseinrichtung am Ort der Fernwirkzentrale oder - falls mehrere Fernwirkzentralen vorhanden sind - wenigstens am Orte einer der Fernwirkzentralen. Sie kann jedoch auch als Prüfeinrichtung an einer anderen Stelle der Übertragungsstrecke angeordnet sein.According to the invention, the monitoring device is designed to solve this problem in such a way that the transmission device contains display means for displaying the address and the differentiation criterion and that the differentiation criteria determined by the evaluation device can be monitored by means of a monitoring arrangement in such a way that interruptions in the occurrence of central station telegram criteria that exceed a predetermined time period trigger an alarm signal. The monitoring device can be connected to the transmission link via its own modem or a modem of the central station or a substation. In particular, a certain bit of the telecontrol telegram can serve as the differentiation criterion, the logical '1' being the central station criterion and the logical '0' being the substation criterion. The monitoring device is preferably located at the location of the telecontrol center or - if there are several telecontrol centers - at least at the location of one of the telecontrol centers. However, it can also be arranged as a test device at another point on the transmission link.

Durch die genannten Maßnahmen ergibt sich der Vorteil, daß sich die Fernwirkeinrichtung besonders zuverlässig d'araufhin überwachen läßt, ob auf der, insbesondere durch eine allen Stationen gemeinsamen Leitung gebildeten Übertragungsstrecke in regelmäßigen Abständen Zentralstationstelegramme sind. Ist dies nicht der Fall, wird ein Ausfallalerm abgegeben.The measures mentioned have the advantage that the telecontrol device can be monitored particularly reliably whether there are central station telegrams at regular intervals on the transmission link formed, in particular, by a line common to all stations. If this is not the case, a failure alarm is issued.

Von besonderem Vorteil ist die Überwachungseinrichtung bei Fernwirkeinrichtungen mit mehreren Zentralstationen, bei denen eine zunächst aktive Zentralstation im Störungsfall durch eine weitere Zentralstation abgelöst wird, die vom passiven in den aktiven Zustand übergeht, sobald sie nach einer bestimmten Wartezeit keine Zentralentelegramme mehr empfängt. Stellt eine Überwachungseinrichtung, die sich bei einer von solchen Zentralstationen befindet, fest, daß keine Zentralenstationstelegramme mehr übertragen werden, so ist nämlich sicher, daß die betreffende Zentralstation selbat ausgefallen ist.The monitoring device is particularly advantageous for telecontrol devices with several central stations, in which an initially active central station is replaced in the event of a fault by a further central station, which changes from the passive to the active state as soon as it no longer receives central telegrams after a certain waiting time. If a monitoring device located at one of such central stations detects that no central station telegrams are being transmitted, it is namely certain that the central station in question has failed itself.

In Weiterbildung der Erfindung.läßt sich die Überwachungseinrichtung dadurch noch weiter vervollkommnen, daß die Überwachungseinrichtung einer Zentralstation räumlich benachbart-angeordnet ist und daß mittels der Überwachungsanordnung zusätzlich zu den Zentralstationstelegrammkriterien auch in der Zentralstation gebildete Prüfimpulsfolgen derart überwachbar sind, daß eine vorgegebene Zeitspanne überschreitende Unterbrechungen im Auf treten von Prüfimpulsen ein Alarmsignal auslösen. Diese Maßnahmen ermöglichen es in vorteilhafter Weise, in Fernwirkeinrichkungen mit mehreren Zentralstationen Funktionsstörungen einer Zentralstation auch dann festzustellen, wenn eine andere Zentralstation die Abfragetelegramme aussendet.In a further development of the invention, the monitoring device can be further perfected in that the monitoring device is spatially adjacent to a central station and that, in addition to the central station telegram criteria, the monitoring arrangement also in the central station Test pulse sequences formed can be monitored in such a way that interruptions in the occurrence of test pulses which exceed a predetermined time period trigger an alarm signal. These measures advantageously make it possible to determine malfunctions of a central station in telecontrol devices with several central stations even if another central station sends out the query telegrams.

In weiterer Ausgestaltung der Erfindung werden die Überwachungseinrichtungen einer Zentralstation räumlich benachbart angeordnet und ein aus dem Alarmsignal gewonnenes Kriterium dem Starteingang einer in der Zentralstation anthaltenen Einrichtung zur Ablaufsteuerung als Startsignal zugeführt. Dabei kann eine Startautomatik, die ein Mikrocomputersystem der Zentrale neu zu starten versucht, eingeschaltet werden, sobald die Zentralstation keine Fernwirktelegramme mehr aussendet oder als gestört arkännt wird. Insbesondere bestehen solche Startversuche im Rücksetzen einer Einrichtung zur Ablaufsteuerng auf aine Nullstellung, von der sie selbsttätig nau startet.In a further embodiment of the invention, the monitoring devices of a central station are arranged spatially adjacent and a criterion obtained from the alarm signal is fed as a start signal to the start input of a device for sequence control held in the central station. An automatic start which tries to restart a microcomputer system of the central can be switched on as soon as the central station no longer sends telecontrol telegrams or is flagged as disturbed. In particular, such starting attempts consist in resetting a device for sequence control to a zero position, from which it starts automatically.

Das Unterscheidungskritarium kann mittels einer eigenen Leuchtdiode angezeigt werden, die der Vorrichtung zur Adressenanzsige benachbart angeordnet ist.The differentiation criterion can be displayed by means of its own light-emitting diode, which is arranged adjacent to the device for address indication.

Zweckmäßigerweise wird die Überwachungsainrichtung derart ausgebildet, daß die Anzeigemittel zur Anzeige der Telegrammadresse und des Unterscheidungskriteriums ein Ziffernanzeigeelement mit Zusatzzeichen, insbesondere einem Dezimalpunkt, enthalten und daß ein aus dem Unterscheidungskriterium abgeleitetes Steuersignal dem Eingang des Ziffernanzaigeelementes zugeführt ist, der dem Zusatzzeichen zugeordnet ist. Dabei lassen sich Zentralstationstelegramme und Unterstationstelegramme bei der optischen Anzeige mit besonders einfachen Mitteln besonders übersichtlich voneinander unterscheiden, obwohl das Abfragetelegramm der Fernwirkzentrale und das folgende Antworttelegramm einer Unterstation jeweils die gleiche Telegrammadresse haben. Das zur Unterscheidung von Abfrage- und Antworttelegramm-Adressen dienende zusätzliche optische Zeichen erfordert in vorteilhafter Weise keinen besonderen Aufwand. Z.B. können Zusatzzeichen wie +,-,: oder dgl. Verwendung finden.The monitoring device is expediently designed in such a way that the display means for displaying the telegram address and the differentiation criterion contain a numerical display element with additional characters, in particular a decimal point, and that a control signal derived from the differentiation criterion is fed to the input of the digit display element which is assigned to the additional character. Central station telegrams and substation telegrams can be clearly distinguished from one another in the optical display using particularly simple means, even though the query telegram from the remote control center and the subsequent response telegram from a substation each have the same telegram address. The additional optical character used to distinguish query and response telegram addresses advantageously does not require any special effort. E.g. additional characters such as +, - ,: or the like can be used.

Die Prüfung, ob in regelmäßigen Abständen Zentralstationstelegramme auf der Leitung sind, wird zweckmäßigerweise dadurch vorgenommen, daß die Überwachungsanordnung zur Auswertung des Unterscheidungskriteriums einen Zähler enthält, dessen Takteingang an einen Taktgeber der Überwachungseinrichtung angeschlossen, dessen Rücksetzeingang mit aus den Zentralstationstelegrammkriterien abgeleiteten Steuersignalen beaufschlagbar und dessen Weiterschaltung bei Erreichen eines vorgegebenen Zählerstandes blockierbar ist.The check as to whether central station telegrams are on the line at regular intervals is expediently carried out in that the monitoring arrangement for evaluating the differentiation criterion contains a counter, the clock input of which is connected to a clock generator of the monitoring device, the reset input of which can be acted upon with control signals derived from the central station telegram criteria, and its forwarding can be blocked when a predetermined counter reading is reached.

Die Überwachung von in der Zentralstation gebildeten Prüfimpulsfolgen wird zweckmäßigerweise dadurch erreicht, daß die Überwachungsanordnung wenigstens einen Zähler enthält, dessen Takteingang an einen Taktgeber angeschlossen und dessen Rücksetzeingang mit dem Ausgang einer in der Zentralstation enthaltenen Prüfeinrichtung verbunden ist, die bei ungestörtem Betrieb in regelmäßigen Abständen Prüfimpulse abgibt.The monitoring of test pulse sequences formed in the central station is expediently achieved in that the monitoring arrangement contains at least one counter, the clock input of which is connected to a clock generator and the reset input of which is connected to the output of a test device contained in the central station, which test pulses at undisturbed operation at regular intervals delivers.

In weiterer Ausgestaltung der Erfindung wird die Überwachungseinrichtung derart ausgebildet, daß die Überwachungsanordnung einen Zähler enthält, dessen Takteingang mit einem Taktgeber verbunden und dessen Rücksetzeingang mit den Taktimpulsen eines in der Zentralstation enthaltenen Taktgebers beaufschlagbar ist. Dabei ermöglicht es der weitere Zähler in vorteilhafter Weise, die Übereinstimmung des Taktes der Fernwirkzentrale mit dem bei der Überwachung verwendeten Takt seinerseits sicher zu überwachen. Ist das Zusatzzeichen des Ziffernanzeigeelementes durch das Steuersignal derart steuerbar, daß es bei vorhandenem Unterstationstelegrammkriterium aktiviert ist, so ergibt sich eine besonders leicht erkennbare Anzeige der Folge der über die Übertragungsstrecke laufenden Fernwirktelegramme.In a further embodiment of the invention, the monitoring device is designed such that the monitoring arrangement contains a counter, the clock input of which is connected to a clock generator and the reset input of which can be acted upon by the clock pulses of a clock generator contained in the central station. The further counter advantageously makes it possible to reliably monitor the correspondence between the clock of the remote control center and the clock used in the monitoring. If the additional character of the numerical display element can be controlled by the control signal in such a way that it is activated when the substation telegram criterion is present, the result of the sequence of telecontrol telegrams running over the transmission path is particularly easy to recognize.

Insbesondere ist der Taktgeber hinsichtlich seiner Taktfrequenz auf die bei der Fernwirkeinrichtung wählbaren Bitfolgefrequenzen einstellbar.In particular, the clock frequency can be set to the bit repetition frequencies that can be selected in the telecontrol device with regard to its clock frequency.

Die Erfindung wird anhand des in der Figur dargestellten Ausführungsbeispieles näher erläutert.The invention is explained in more detail with reference to the embodiment shown in the figure.

Die Fig. zeigt eine Überwachungseinrichtung, die an eine Zentralstation angeschlossen ist.The figure shows a monitoring device which is connected to a central station.

Bei der in der Fig. gezeigten Überwachungseinrichtung ist die Zentralstation 1 über das Modem 10 an die Übertragungsleitung 3 angeschlossen. Die Übertragungsleitung 3 verbindet die Zentralstation 1 mit den Unterstationen und ggf. mit weiteren Zentralstationen,von denen lediglich die Unterstation 2 mit ihrem Modem 20 dargestellt ist.In the monitoring device shown in the figure, the central station 1 is connected to the transmission line 3 via the modem 10. The transmission line 3 connects the central station 1 to the substations and possibly to further central stations, of which only the substation 2 is shown with its modem 20.

Die von der Zentralstation 1 zum Modem 10 bzw. vom Modem 10 zur Zentralstation 1 übermittelten Fernwirktelegramme werden über die Entkopplungsdioden 61,62 der Überwachungseinrichtung 5 zugeführt. Die Überwachungseinrichtung 5 wertet den Datenstrom aus. Die darin enthaltene Anordnung 51, die im wesentlichen aus einem durch den Taktgenerator 6 steuerbaren Schieberegister besteht, empfängt die Impulstelegramme und gibt sie nach einer SeriellParallel-Umsetzung an ihrem Ausgangsbus-byteweise an die Einrichtung 52 zur Synchronzeichenauswertung weiter. Erkennt die Einrichtung 52 ein Synchronzeichen, so gibt sie die Steuervorrichtung 53 frei. Die Steuervorrichtung 53, die an den Taktgenerator 6 angeschlossen ist, beginnt vom Zeitpunkt der Freigabe ab mit dem Zählen der Taktimpulse und gibt bei Erreichen einer vorgegebenen Zahl von Taktimpulsen einen Strobe-Impuls als logische '1' an die Ansteuerschaltung 42 ab. Die Ansteuerschaltung 42, die über einen sieben Bit breiten Adressenbus mit der Anordnung 51 verbunden ist, wird durch den Strobe-Impuls zur Übernahme der binär codierten Adresse veranlaßt.The telecontrol telegrams transmitted from the central station 1 to the modem 10 or from the modem 10 to the central station 1 are fed to the monitoring device 5 via the decoupling diodes 61, 62. The monitoring device 5 evaluates the data stream. The arrangement 51 contained therein, which essentially consists of a shift register controllable by the clock generator 6, receives the pulse telegrams and, after a serial-parallel conversion, forwards them byte by byte to the device 52 for synchronous character evaluation. If the device 52 recognizes a synchronous character, it releases the control device 53. The control device 53, which is connected to the clock generator 6, starts counting the clock pulses from the time of the release and, when a predetermined number of clock pulses is reached, outputs a strobe pulse as a logic '1' to the control circuit 42. The drive circuit 42, which is connected to the arrangement 51 via a seven bit wide address bus, is caused by the strobe pulse to adopt the binary-coded address.

Die Ansteuerschaltung 42 dient zur Steuerung der Vorrichtung 41 zur Ziffernanzeige. Sie enthält einen Adressenspeicher und einen oder mehrere Codierer, mit deren Hilfe die zur Ansteuerung der Vorrichtung 41 zur Ziffernanzeige erforderlichen Steuersignaleaus der binär codierten Adresseninformation gewonnen werden. Vorzugsweise wird die Adresse in einer Zwischenstufe zunächst in den BCD-Code und daran anschließend in die zur Ansteuerung von 7-Segment-Anzeigeelementen üblichen Steuersignale überführt.The control circuit 42 is used to control the device 41 for numerical display. It contains an address memory and one or more encoders, with the aid of which the control signals required for controlling the device 41 for numerical display are obtained from the binary-coded address information. In an intermediate stage, the address is preferably first converted into the BCD code and then subsequently into the control signals customary for controlling 7-segment display elements.

Die Vorrichtung 41 zur Ziffernanzeige enthält ein Anzeigeelement, das zur Anzeige eines Dezimalpunktes dient. Dieses Anzeigeelement wird über das D-Flip-Flop 54 gesondert angesteuert. Dieses D-Flip-Flop 54 liegt mit seinem Takteingang am Ausgang der Steuervorrichtung 53 und mit seinem D-Eingang an einem Anschluß des Ausganges der Anordnung 51.The device 41 for numerical display contains a display element which serves to display a decimal point. This display element is controlled separately via the D flip-flop 54. This D flip-flop 54 is connected to the output of the control device 53 with its clock input and to a connection of the output of the arrangement 51 with its D input.

Die dem Ausführungsbeispiel zugrundeliegenden Fernwirktelegramme sind aus mehreren Bytes mit je 8 Bit zusammengesetzt. Das Fernwirktelegramm beginnt mit einem Synchronbyte. Ein weiteres Byte dient als Adressbyte und besteht aus einem als Unterscheidungskriterium dienenden sogenannten Z-Bit und sieben Adressenbits.The telecontrol telegrams on which the exemplary embodiment is based are composed of several bytes each with 8 bits. The telecontrol telegram begins with a synchronous byte. Another byte serves as an address byte and consists of a so-called Z-bit, which serves as a differentiation criterion, and seven address bits.

Liegt das Adressenbyte am Ausgang der Anordnung 51 an, so wird das D-Flip-Flop 54 durch den Strobe-Impuls der Steuervorrichtung 53 veranlaßt, das Z-Bit zu übernehmen und am Ausgang des D-Flip-Flops erscheint als Steuersignal für das Zusatzzeichen der Vorrichtung 41 ein gespeichertes Zentralstationstelegrammkriterium Z' als logische '1'.If the address byte is present at the output of the arrangement 51, the D flip-flop 54 is caused by the strobe pulse of the control device 53 to take over the Z bit and appears at the output of the D flip flop as a control signal for the additional character the device 41 a stored central station telegram criterion Z 'as a logical' 1 '.

Die Überwachungseinrichtung 5 der Täktgenerator 6 und die Ansteuerschaltung 42 können insbesondere mit Hilfe eines kleinen Mikrocomputersystems aufgebaut werden.The monitoring device 5, the clock generator 6 and the control circuit 42 can be constructed in particular with the aid of a small microcomputer system.

Die Überwachungsanordnung 7 enthält die Zähler 71, 72 und 73, die jeweils mit einem Takteingang an den Taktgenerator 6 angeschlossen sind. Die Fortschaltung durch den Takt wird bei Erreichen der Zählerendstellung dadurch blockiert, daß der Ausgang des Zählers mit einem EnableEingang E verbunden ist. Die Ausgänge der Zähler 71,72 und 73 sind ferner an die Eingänge des Dreifach-OderGliedes 74 geführt, dessen Ausgang sowohl an die Anzeigevorrichtung 75 als auch über die Startautomatik 9 an den Rücksetzeingang R der Zentralstation 1 geführt ist. In Abwandlung des gezeigten Ausführungsbeispieles können die Alarmsignale der Zähler 71,72,73 andererseits einzeln oder nur zum Teil zusammengefaßt angezeigt bzw. der Startautomatik zugeführt werden.The monitoring arrangement 7 contains the counters 71, 72 and 73, which are each connected to the clock generator 6 with a clock input. The advance through the clock is blocked when the counter end position is reached in that the output of the counter is connected to an enable input E. The outputs of the counters 71, 72 and 73 are also routed to the inputs of the triple OR element 74, the output of which is routed both to the display device 75 and via the automatic start device 9 to the reset input R of the central station 1. In a modification of the exemplary embodiment shown, the alarm signals of the counters 71, 72, 73, on the other hand, can be displayed individually or only in part, or can be fed to the automatic start.

Die als Binärzähler ausgebildeten Zähler 71,72 und 73 werden auf unterschiedliche Art zurückgesetzt.The counters 71, 72 and 73 designed as binary counters are reset in different ways.

Der Zähler 71 ist mit seinem Rücksetzeingang R an den Ausgang des Und-Gliedes 55 angeschlossen, das mit dem einen Eingang zusammen mit dem D-Eingang des D-FlipFlops 54 an einem Anschluß des Ausganges der Anordnung 51 und mit dem anderen Eingang am Ausgang der Steuervorrichtung 53 liegt. Das Und-Glied 55 fragt mit Hilfe des von der Vorrichtung 53 abgegebenen Strobe-Signals das von der Anordnung 51 gelieferte Z-Bit ab. Der Zähler 71 wird daher bei jedem Zentralstationstelegramm zurückgesetzt. Fehlen Zentralstationstelegramme während einer vorgegebenen Zeitspanne, so erreicht der Zähler 71 seine Endstellung und gibt ein Alarmsignal an das Oder-Glied 74 ab.The counter 71 is connected with its reset input R to the output of the AND gate 55, which has one input together with the D input of the D flip-flop 54 at a connection of the output of the arrangement 51 and with the other input at the output of the Control device 53 is located. The AND gate 55 queries the Z bit supplied by the arrangement 51 with the aid of the strobe signal emitted by the device 53. The counter 71 is therefore reset with each central station telegram. If central station telegrams are missing during a predetermined period of time, the counter 71 reaches its end position and emits an alarm signal to the OR element 74.

Die Rücksetzeingänge der Zähler 72 und 73 sind dynamische Eingänge, die nur auf positive Taktflanken ansprechen.The reset inputs of counters 72 and 73 are dynamic inputs that only respond to positive clock edges.

Der Rücksetzeingang R des Zählers 72 ist an einen Taktausgang der Zentralstation 1 angeschlossen, der auch an einen Takteingang des Modems 10 geführt ist. Der Zähler 72 überwacht daher die Taktimpulsfolge der Zentralstation 1.The reset input R of the counter 72 is connected to a clock output of the central station 1, which is also connected to a clock input of the modem 10. The counter 72 therefore monitors the clock pulse sequence of the central station 1.

Der Rücksetzeingang des Zählers 73 ist an einen Prüfimpulsausgang S der Zentralstation angeschlossen. Die Einrichtung zur Ablaufsteuerung der Zentralstation 1 gibt an den Prüfimpulsausgang inregelmäßigen Abständen Überwachungsimpulse ab und zwar auch dann, wenn eine andere Zentralstation Abfragetelegramme an die Übertragungsstrecke abgibt und die betrachtete Zentralstation daher passiv bleiben muß.The reset input of the counter 73 is connected to a test pulse output S of the central station. The device for sequence control of the central station 1 emits monitoring pulses to the test pulse output at regular intervals, even when another central station sends query telegrams to the transmission link and the central station under consideration must therefore remain passive.

Aus den Adressenbytes der Fernwirktelegramme wird als Unterscheidungskriterium das sogenannte Z-Bit ausgewertet und zur Steuerung von drei verschiedenen Funktionen verwendet: Als Steuersignal Z' steuert es eine optische Anzeige zur Kennzeichnung der Unterstationstelegramme, die durch den Dezimalpunkt der Vorrichtung 41 zur Ziffernanzeige gebildet ist. Fehlt das Z-Bit während eines bestimmten Zeitraumes, so wird über das Oder-Glied 74 die Leuchtdiode der Anzeigevorrichtung 75 zur Abgabe eines Zentralen-Alarms aktiviert. Außerdem veranlaßt dieser Alarm über die Startautomatik 9 den Neustart eines Mikroprozessors, der zur Ablaufsteuerung der Zentrale 1 dient. Diese Startautomatik 9 wird durch einen Taktimpulsgeber gebildet, der in regelmäßigen Zeitabständen Startimpulse abgibt, wenn er durch ein Alarmsignal über seinen Enable-Eingang E freigegeben wird.From the address bytes of the telecontrol telegrams, the so-called Z-bit is evaluated as a differentiating criterion and used to control three different functions: As control signal Z ', it controls an optical display for identifying the substation telegrams, which is formed by the decimal point of the device 41 for the numerical display. If the Z bit is missing during a certain period of time, the LED of the display device 75 is activated via the OR gate 74 to emit a central alarm. In addition, this alarm causes the automatic start 9 to restart a microprocessor which is used to control the sequence of the control center 1. This automatic start 9 is formed by a clock pulse generator, which emits start pulses at regular time intervals when it is released by an alarm signal via its enable input E.

Die Vorrichtung 41 zur Ziffernanzeige macht die Adressen der über das Fernwirkuetz laufenden Telegramme und damit den Zyklusablauf und den Telegrammaustausch sichtbar. An der Vorrichtung 41 zur Ziffernanzeige werden die Telegrammadressen der Fernwirktelegramme angezeigt. Der Dezimalpunkt dient der Anzeige von Unterstationstelegrammen. Die Anzeige bleibt solange stehen, bis ein neues Telegramm eintrifft.The device 41 for numerical display makes the addresses of the telegrams running via the telecontrol and thus the cycle sequence and the telegram exchange visible. The telegram addresses of the telecontrol telegrams are displayed on the device 41 for numerical display. The decimal point is used to display substation telegrams. The display remains until a new telegram arrives.

Die Überwachungseinrichtung besitzt eine eigene, von der Ablaufsteuerung der Zentralstation 1 unabhängige Taktversorgung und erkennt däher auch Fehlfunktionen der Ablaufsteuerung, welche durch einen gestörten Takt verursacht werden.The monitoring device has its own clock supply which is independent of the sequence control of the central station 1 and, moreover, also detects malfunctions of the sequence control which are caused by a faulty clock.

Die eigene Taktversorgung ermöglicht es ferner, die Überwachungseinrichtung als Service- und/oder Prüf-Baugruppe im gesamten Fernwirknetz zur Kontrolle des Telegrammaustausches zu verwenden. In diesem Fall werden nur der Taktgenerator 6, die Einrichtung 5 zur Telegrammauswertung und die Vorrichtung 41 mit der Ansteuerschaltung 42 benützt.The own clock supply also makes it possible to use the monitoring device as a service and / or test module in the entire telecontrol network to control the exchange of telegrams. In this case, only the clock generator 6, the device 5 for telegram evaluation and the device 41 with the control circuit 42 are used.

Claims (9)

1. A monitoring device for remote control devices with at least one central station ( 1) and with subsidiary stations (2) where the stations (2) exchange items of information via a common transmission link (3) by means of time-consecutive pulse telegrams, and the pulse telegrams contain an address component, an information component, and a differentiation criterion which, depending upon whether tha pulse telegram in question emanates from a central station ( 1) or a subsidiary station (2), is a central station telegram criterion or a subsidiary station telegram criterion, and where both the interrogation telegram and the associated response telegram have the same address, and the monitoring device which can be connected to the transmission link (3) includes ananalysis device (5) which serves to analyse the pulse telegrams transmitted on the transmission link (3) in respect of their address and differentiation criterion, characterised in that the transmission device includes display means for the display of the address and the differentiation criterion, and that the differentiation criteria which are determined by the analysis device (5) can be monitored by means of a monitoring arrangement (7) in suchmanner that interruptions, which exceed a predetermined length of time, in the occurrence of central station telegram criteria (Z) trigger an alarm signal.
2. A monitoring device as claimed in claim 1, characterised in that the monitoring device is arranged adjacent to a central station ( 1), and that in addition to the central station telegram criteria (Z), the monitoring arrangement (7) can also monitor test pulse sequences, formed in a central station (1), in such manner that interruptions, which exceed a predetermined length of1:¡me in the occurrence of test pulses, trigger an alarm signal.
3. A monitoring device as claimed in claims 1 or 2, characterised in that the monitoring device is arranged adjacent to a central station ( 1), and that a criterion obtained from the alarm signal is fed as start signal to the start input (R) to a flow control device included in the central station (1).
4. A monitoring device as claimed in one of the claims 1 to 3, characterised in that the display means which serve to display the telegram address and the differentiation criterion include a digit display element with additional characters, in particular a decimal point, and that a control signal (Z') derived from the differentiation criterion is fed to the input of the digit display eiement which is assigned to the additional character.
5. A monitoring device as claimed in one of the claims 1 to 4, characterised in that for the analysis of the differentiation criterion (Z) the monitoring arrangement (7) includes a counter (71) whose clock input is connected to a clock pulse generator (6) of the monitoring device, whose reset input (R) can be supplied with control signals derived from the central station telegram criteria (Z), and the stepping-on of which can be blocked when a predetermined count is reached.
6. A monitoring device as claimed in one of the claims 1 to 4, characterised in that the monitoring arrangement (7) includes at least one counter (73) whose clock input is connected to a clock pulse generator (6) and whose reset input (R) is connected to the output of a test device which is included in the central station (1) and which emits test pulses (S) at regular intervals during fault-free operation.
7. A monitoring device as claimed in one of the claims 1 to 4, characterised in that the monitoring arrangement (7) includes a counter (72) whose clock input is connected to a clock pulse generator (6) and whose reset input (R) can be supplied with the clock pulses of a clock pulse generator included in the central station (1).
8. A monitoring device as claimed in claim 4, characterised in that the decimal point of the digit display element (41) can be controlled by the control element in such manner that it is activated whenever the subsidiary station telegram criterion occurs.
9. A monitoring device as claimed in one of the claims 5 to 8, characterised in that the clock frequency ofthe clock pulse genetator (6) can be set at bit repetion frequencies which can be selected on the remote control device.
EP81109263A 1981-01-12 1981-10-29 Supervisory apparatus for remote-control systems Expired EP0056099B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81109263T ATE17895T1 (en) 1981-01-12 1981-10-29 MONITORING DEVICE FOR TELECONTROL DEVICES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813100683 DE3100683A1 (en) 1981-01-12 1981-01-12 MONITORING DEVICE FOR REMOTE CONTROL DEVICE
DE3100683 1981-01-12

Publications (3)

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EP0056099A2 EP0056099A2 (en) 1982-07-21
EP0056099A3 EP0056099A3 (en) 1983-07-27
EP0056099B1 true EP0056099B1 (en) 1986-02-05

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EP81109263A Expired EP0056099B1 (en) 1981-01-12 1981-10-29 Supervisory apparatus for remote-control systems

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EP (1) EP0056099B1 (en)
AT (1) ATE17895T1 (en)
DE (2) DE3100683A1 (en)
DK (1) DK8482A (en)
NO (1) NO155869C (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59117395A (en) * 1982-12-24 1984-07-06 Hitachi Ltd Terminal processing device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1566782B1 (en) * 1967-04-13 1970-10-08 Siemens Ag Procedure for testing pulse-operated circuits and circuit arrangements for its implementation
DE2516681C2 (en) * 1975-04-16 1983-08-18 Siemens AG, 1000 Berlin und 8000 München Telecontrol device
DE2806677C2 (en) * 1978-02-16 1983-08-25 Dieter Dipl.-Phys. Dr. 8031 Eichenau Philipp Selective remote-controlled switching system
DE2928492C2 (en) * 1979-07-14 1985-04-18 ANT Nachrichtentechnik GmbH, 7150 Backnang Method for monitoring several lines connecting stations for telecontrol mesh networks
DE2929597C2 (en) * 1979-07-21 1984-02-23 ANT Nachrichtentechnik GmbH, 7150 Backnang Circuit arrangement for detecting an AIS signal and the failure of a digital signal.

Also Published As

Publication number Publication date
ATE17895T1 (en) 1986-02-15
DE3100683A1 (en) 1982-08-12
DK8482A (en) 1982-07-13
NO155869C (en) 1987-06-10
EP0056099A2 (en) 1982-07-21
NO155869B (en) 1987-03-02
EP0056099A3 (en) 1983-07-27
DE3173740D1 (en) 1986-03-20
NO820050L (en) 1982-07-13

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