EP2560180B1 - Safety switching device - Google Patents

Safety switching device Download PDF

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Publication number
EP2560180B1
EP2560180B1 EP12180866.1A EP12180866A EP2560180B1 EP 2560180 B1 EP2560180 B1 EP 2560180B1 EP 12180866 A EP12180866 A EP 12180866A EP 2560180 B1 EP2560180 B1 EP 2560180B1
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EP
European Patent Office
Prior art keywords
switching device
safety switching
signal
safety
reset input
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EP12180866.1A
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German (de)
French (fr)
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EP2560180A3 (en
EP2560180A2 (en
Inventor
Markus Eilers
Henry Peter
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Phoenix Contact GmbH and Co KG
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Phoenix Contact GmbH and Co KG
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays

Definitions

  • the present invention relates to a
  • a safety switching device having a reset input for starting the safety switching device after triggering its safety function, wherein an evaluation circuit is connected to the reset input to detect the application of a start signal, and the safety switching device provides different start modes and is executed, a start mode in accordance with select the detected start signal.
  • Safety switching devices such as safety relays or the like are known in the art as such and are used to perform switching operations in safety-related areas.
  • the triggering of its safety function takes place, as a result of which the safety switching device performs a predetermined operation.
  • a safe state is achieved, for example by disconnecting a load from the mains.
  • this condition may result in unwanted behavior after removal of the error. Therefore, in such safety switching devices is known to perform this with a reset input to be able to reset after triggering their safety function in a well-defined initial state.
  • the implementation of the reset function in the safety switching device is realized in that at a reset input an applied analog start signal, such as an applied voltage level or a voltage edge is detected with an analog evaluation circuit.
  • the safety switching device comprises a switching element and an operating mode setting device for selecting an operating mode depending on a defined input signal.
  • the safety switching device further comprises an input which is connected to the operating mode setting device, so that the input signal can be supplied to it.
  • the operating mode setting means is arranged to detect the input signal as one of at least three different defined input signals and to select one of at least three defined operating modes depending thereon.
  • the invention is therefore based on the object to provide a safety switching device, the universal can select different start modes, the selection of the start modes is performed quickly, easily and with high reliability.
  • a safety switching device with a reset input for starting the safety switching device is specified after triggering its safety function, wherein an evaluation circuit is connected to the reset input in order to detect the application of a start signal, and the safety switching device provides and executes various start modes. selecting a start mode in accordance with the detected start signal, the evaluation circuit including sampling means for sampling the signal applied to the reset input and detecting it from a sequence of samples.
  • the basic idea of the invention is thus to carry out the detection of the analog start signal by means of a digital scan, in which case the respective start signal is detected from a sequence of sampled values.
  • the length of the sequence can be selected depending on the types of defined start signals and in principle be arbitrary. However, it is advantageous to record the respective start signal from as short a sequence of sample values as possible in order to enable a quick restart.
  • the sampling can be done with arbitrary parameters in order to use both simple signals as well as complex signals, for example well-defined level curves, as a start signal can.
  • the number of different start modes can be set practically arbitrarily high by selecting the parameters for sampling the signal applied to the reset input. With an increase in the duration of the sampling and an associated increased number of samples, the start signal can be detected with high reliability, since short-term temporary deviations from the starting signal are disregarded.
  • the evaluation circuit is designed to detect a voltage level as a start signal.
  • the evaluation circuit is designed to detect a voltage edge as a start signal.
  • the evaluation circuit is designed to detect a clocked signal as a start signal. Due to the flexibility in detecting the start signal, it is possible to detect various of the above-mentioned start signals in an evaluation circuit. The types of start signals mentioned are easy to generate and enable reliable detection by the evaluation circuit. A combination of the different signals is also possible.
  • the reset input is biased to a voltage level.
  • the bias voltage forms a quiescent level, so that deviations from this can be recognized as the indication of a start signal.
  • the application of a ground signal can be easily detected.
  • biasing the reset input can detect both an applied signal at a ground level and an operating voltage level as a start signal.
  • the evaluation circuit has a voltage divider, via which a part of the signal present at the reset input is supplied to the sampling device for sampling. This makes it possible to use start signals with substantially arbitrary voltage levels, since the voltage divider applied to the scanning device only for this appropriate voltage level.
  • the evaluation circuit has means to protect a scanning input of the scanning device in case of failure.
  • Such means may for example be decoupling means, which decouples the reset input in the event of a short circuit from the scanning device.
  • Such coupling means may comprise, for example, a coupling resistor which limits a current to the scanning device.
  • a decoupling diode may also be connected to the input of the sampling device in order to limit a voltage level to its analog input.
  • the safety switching device may comprise a checking device, which is arranged and designed to provide different starting signals to the scanning device.
  • the checking device can read the start signals directly at the scanning device or anywhere between the reset input and the scanner.
  • the checking device in safety-relevant switching devices and the correct function of the restart or the reset is to ensure, so that a review of this function improves the reliability. By providing various start signals, the response of the safety switching device to all such start signals can be checked.
  • the safety switching device may comprise an actuating device, for example in the form of a switch or a button, in order to carry out a check of the evaluation circuit, or the check is signaled and started via a signal input of the safety switching device.
  • an output of the check result via the signal input or other suitable output means for example, a visual display, take place.
  • the checking device is arranged and designed to provide different starting signals to the scanning device as modulated signals. Due to the modulation different start signals can be easily generated, at the same time a universal generation of start signals can be done.
  • the verifier may have an output connected to an input of the sampler to connect this input either to ground or to a predefined one Voltage level, for example, operating voltage to put. By temporal sequence of voltage levels and ground arbitrary start signals can be provided. If the input of the sampling device is biased at the predefined voltage level, it may be sufficient to ground the input of the sampling device via the checking device in order to modulate the starting signals.
  • At least one signal generating unit is provided and connected to an output contact of the safety switching device to provide a start signal to the reset input.
  • the signal provided by the signal generation unit is returned via a connected circuit to the safety switching device, more precisely to its reset input, in order to be detected as a start signal.
  • the specification of the signals by the signal generation unit ensures that only suitable signals are applied as start signals to the reset input. Errors resulting from external generation of the start signals are avoided.
  • the signal generation unit may generate a voltage level or a clock signal that can be used to generate start signals.
  • a plurality of signal generating units is provided and each connected to an output contact of the safety switching device, wherein the output contacts of the signal generating units are interconnected to provide a predetermined signal at the reset input.
  • a signal generation unit can have at least one constant Provide voltage levels, and another signal generating unit a clocked signal, which is superimposed on the constant voltage level.
  • the safety switching device is a safety relay.
  • FIG. 1 shows a safety switching device 1, in which various modules relating to the invention are shown schematically.
  • the safety switching device 1 is designed to carry out a plurality of different starting modes with which the safety switching device 1 can be started after triggering its safety function.
  • the safety switching device 1 comprises an evaluation circuit 2, which is connected to an analog reset input IN of the safety switching device 1.
  • the evaluation circuit 2 comprises an input circuit 3 and a sampling device 4, which in Fig. 1 is called logic.
  • the input circuit 3 includes a bias source, not shown, which biases the reset input IN through a resistor R1 and a diode D1 with a bias voltage V1.
  • the voltage level of the bias voltage V1 is between ground and an operating voltage, also referred to herein as Vcc, and in this embodiment is half the operating voltage Vcc.
  • the input circuit 3 comprises a voltage divider 5 with two resistors R2, R3, between which a potential V2 is tapped.
  • the potential V2 thus corresponds to the respective one at the reset input IN applied potential, however, is suitable for a sampling input AI of the scanning device 4 as an input level.
  • the input circuit 3 as protection for the scanning device 4, a resistor R4 and a diode D2, via which the potential V2 of the voltage divider 5 to the sampling input AI of the scanning device 4 is connected.
  • the resistor R4 is designed as a decoupling resistor in the connection of the potential V2 with the sampling input AI, while the diode D2 is coupled via ground to this connection in order to limit a level at the sampling input AI of the sampling device 4.
  • the resistor R4 thus begins the fault case of a short circuit of the resistor R2 of the voltage divider 5, while the diode D2 causes a limitation of the input voltage at the sampling input AI of the scanning device 4 in the event of an error of the resistor R1.
  • the safety switching device 1 further comprises a checking device 6, in FIG Fig. 1 Also referred to as a test, which is connected via a resistor R5 to the sampling input AI of the scanning device 4. Both the scanning device 4 and the checking device 6 are each connected to the operating voltage Vcc and the ground of the safety switching device 1.
  • the scanning device 4 is designed to scan via the input circuit 3 a signal applied to the reset input IN analog signal and to detect a start signal. For this purpose, a sequence of samples is evaluated, and in the case of detection of a start signal, a message to a control device of the safety switching device 1, not shown here Posted.
  • the evaluation circuit 2 is designed to detect both voltage levels, voltage edges and clocked signals as start signals. By the bias of the reset input IN, both the application of ground as well as a different voltage level from the bias voltage V1 can be detected by the scanning device 4.
  • the safety switch device 1 selects a start mode in accordance with the detected start signal to restart after the triggering of its safety function.
  • the checking device 6 is designed to apply different start signals as modulated signals via the resistor R5 to the sampling input AI of the sampling device 4. For this purpose, a voltage applied to the sampling input AI voltage level V3 is raised or lowered via the resistor R5 by applying the operating voltage Vcc or ground, so as to produce different start signals.
  • the scanning device 4 is connected to the checking device 6 in order to be able to transmit the detected start signal to the latter, so that the checking device 6 can compare the generated starting signal with the starting signal detected by the scanning device 4 in order to check the function of the scanning device 4.
  • the safety switching device 1 further comprises a power supply unit 7, which is connected to two supply inputs A1, A2 of the safety switching device 1.
  • the power supply unit 7 is connected to a power source 11 to power the safety switch device 1, as in FIGS FIGS. 2 to 5 you can see.
  • the power supply unit 7 supplies the operating voltage Vcc.
  • the safety switching device comprises two signal generating units 8, 9, which are designed as first and second clock generator.
  • the two signal generating units 8, 9 are connected to corresponding clock outputs T0, T1 of the safety switching device 1, and provide different clock signals over it.
  • the clock generation in the signal generating units 8, 9 is controlled by the scanner 4.
  • the external circuitry each comprises an actuator 10, via which the corresponding start signal is applied to the reset input IN when actuated.
  • the actuating device 10 may be designed as an electrical switch or button.
  • the power source 11 is connected to the safety input 1 via the supply inputs A1, A2, respectively, and supplies a level of 24 V.
  • FIGS. 2 and 3 show the application of DC voltages with different levels to the reset input IN.
  • the respective level is provided by the power source 11.
  • the level of 24V triggers a manually monitored reset in the safety switching device 1, while according to FIG. 3 the level is at ground and triggers an automatic reset.
  • a clock signal is used as a start signal, as described above on the Actuator 10 is applied to the reset input IN.
  • the clock signal in FIG. 4 is tapped via the clock output T0, while according to FIG. 5 the clock signal is tapped at the clock output T1.
  • the according to FIG. 4 provided start signal a manually monitored reset with a delayed start and the start signal according to FIG. 5 cause an automatic reset with a delayed start.
  • the assignment of the start signals to the different start modes according to the FIGS. 2 to 5 is purely arbitrary. Other assignments are also possible. Also, the selection of the start modes mentioned here is purely arbitrary. Likewise, other applications can be selected via the selection of the signal source for the reset, for example applications with or without waste delay.

Description

Die vorliegende Erfindung betrifft eineThe present invention relates to a

Sicherheitsschalteinrichtung mit einem Reset-Eingang zum Starten der Sicherheitsschalteinrichtung nach einem Auslösen ihrer Sicherheitsfunktion, wobei eine Auswerteschaltung mit dem Reset-Eingang verbunden ist, um das Anlegen eines Startsignals zu erfassen, und die Sicherheitsschalteinrichtung verschiedene Startmodi bereitstellt und ausgeführt ist, einen Startmodus in Übereinstimmung mit dem erfassten Startsignal auszuwählen.A safety switching device having a reset input for starting the safety switching device after triggering its safety function, wherein an evaluation circuit is connected to the reset input to detect the application of a start signal, and the safety switching device provides different start modes and is executed, a start mode in accordance with select the detected start signal.

Sicherheitsschalteinrichtungen wie beispielsweise Sicherheitsrelais oder ähnlichen sind im Stand der Technik als solche bekannt und werden verwendet, um Schaltvorgänge in sicherheitsrelevanten Bereichen durchzuführen. Im Fehlerfall erfolgt das Auslösen ihrer Sicherheitsfunktion, wodurch die Sicherheitsschalteinrichtung eine vorgegebene Operation durchführt. Es wird ein sicherer Zustand erreicht, beispielsweise indem eine Last vom Netz getrennt wird. Dieser Zustand kann jedoch nach dem Beseitigen des Fehlers zu einem ungewünschten Verhalten führen. Daher ist bei derartigen Sicherheitsschalteinrichtungen bekannt, diese mit einem Reset-Eingang auszuführen, um sie nach dem Auslösen ihrer Sicherheitsfunktion in einen wohl definierten Anfangszustand zurücksetzen zu können. Die Implementierung der Resetfunktion in der Sicherheitsschalteinrichtung wird dadurch realisiert, dass an einem Reset-Eingang ein anliegendes analoges Startsignal, beispielsweise ein anliegender Spannungspegel oder eine Spannungsflanke, mit einer analogen Auswerteschaltung erfasst wird.Safety switching devices such as safety relays or the like are known in the art as such and are used to perform switching operations in safety-related areas. In the event of an error, the triggering of its safety function takes place, as a result of which the safety switching device performs a predetermined operation. A safe state is achieved, for example by disconnecting a load from the mains. However, this condition may result in unwanted behavior after removal of the error. Therefore, in such safety switching devices is known to perform this with a reset input to be able to reset after triggering their safety function in a well-defined initial state. The implementation of the reset function in the safety switching device is realized in that at a reset input an applied analog start signal, such as an applied voltage level or a voltage edge is detected with an analog evaluation circuit.

In der Praxis hat sich dabei herausgestellt, dass verschiedene Arten der Durchführung eines Resets und eines damit verbundenen Startmodus der Sicherheitsschalteinrichtung vorteilhaft sein können. Dies wird üblicherweise dadurch realisiert, dass unterschiedlich ausgeführte Sicherheitsschalteinrichtungen mit dem jeweils erwünschten Startmodus bereitgestellt und nach den jeweiligen Anforderungen ausgewählt und eingesetzt werden.In practice, it has been found that various ways of performing a reset and an associated start mode of the safety switching device may be advantageous. This is usually achieved by providing differently executed safety switching devices with the respectively desired start mode and selecting and using them according to the respective requirements.

Darüber hinaus ist aus der noch nicht veröffentlichten DE 10 2010 060 415 A eine Sicherheitsschalteinrichtung mit einem Reset-Eingang bekannt, die zwei verschiedene Startmodi gleichzeitig implementiert. Dazu ist die Auswerteschaltung derart ausgeführt, dass sie sowohl das Anlegen einer Masse an den Reset-Eingang wie auch das Entfernen einer an dem Reset-Eingang anliegenden Startspannung erkennen kann. In Übereinstimmung mit der Art des erfassten Startsignals wird der Startmodus entsprechend ausgewählt. Obwohl dies bereits eine deutliche Verbesserung gegenüber dem zuvor genannten Stand der Technik darstellt, hat sich in der Praxis gezeigt, dass ein Bedarf für das Bereitstellen weiterer Startmodi in einer Sicherheitsschalteinrichtung besteht, da es umständlich, platzaufwendig und kostenintensiv ist, Sicherheitsschalteinrichtungen mit unterschiedlichen Startmodi vorzuhalten. Auch besteht die Gefahr der Verwechslung von Sicherheitsschalteinrichtungen mit unterschiedlichen Startmodi. Darüber hinaus ist es wünschenswert, die Erfassung der Startsignale mit einer hohen Zuverlässigkeit durchzuführen.In addition, from the not yet published DE 10 2010 060 415 A a safety switching device with a reset input known that implements two different start modes simultaneously. For this purpose, the evaluation circuit is designed such that it can detect both the application of a ground to the reset input as well as the removal of a voltage applied to the reset input starting voltage. In accordance with the type of the detected start signal, the start mode is selected accordingly. Although this already represents a significant improvement over the aforementioned prior art, it has been found in practice that there is a need for providing further startup modes in a safety switching device, since it is cumbersome, space consuming and costly to maintain safety switching devices with different startup modes. There is also a risk of confusion between safety switching devices with different starting modes. In addition, it is desirable to perform the detection of the start signals with high reliability.

Weiter ist aus der WO 01/75532 A1 ein Sicherheitsschaltgerät zum Ein- und sicheren Ausschalten eines elektrischen Verbrauchers abhängig von einem Schaltereignis eines Sicherheitsgebers bekannt. Das Sicherheitsschaltgerät umfasst ein Schaltelement und eine Betriebsmodus-Einstelleinrichtung zur Auswahl eines Betriebsmodus abhängig von einem definierten Eingangssignal. Das Sicherheitsschaltgerät umfasst weiterhin einen Eingang, der mit der Betriebsmodus-Einstelleinrichtung verbunden ist, so dass ihr das Eingangssignal zuführbar ist. Die Betriebsmodus-Einstelleinrichtung ist so ausgebildet, dass sie das Eingangssignal als eines von zumindest drei unterschiedlichen definierten Eingangssignalen erkennt und in Abhängigkeit davon einen von zumindest drei definierten Betriebsmodi auswählt.Next is from the WO 01/75532 A1 a safety switching device for switching on and off safely an electrical consumer depending on a Switching event of a security provider known. The safety switching device comprises a switching element and an operating mode setting device for selecting an operating mode depending on a defined input signal. The safety switching device further comprises an input which is connected to the operating mode setting device, so that the input signal can be supplied to it. The operating mode setting means is arranged to detect the input signal as one of at least three different defined input signals and to select one of at least three defined operating modes depending thereon.

Ausgehend von dem oben genannten Stand der Technik liegt der Erfindung somit die Aufgabe zugrunde, eine Sicherheitsschalteinrichtung anzugeben, die universell unterschiedliche Startmodi auswählen kann, wobei die Auswahl der Startmodi schnell, einfach und mit einer hohen Zuverlässigkeit durchgeführt wird.Based on the above-mentioned prior art, the invention is therefore based on the object to provide a safety switching device, the universal can select different start modes, the selection of the start modes is performed quickly, easily and with high reliability.

Die Lösung der Aufgabe erfolgt erfindungsgemäß durch die Merkmale der unabhängigen Ansprüche. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.The object is achieved by the features of the independent claims. Advantageous embodiments of the invention are specified in the subclaims.

Erfindungsgemäß ist somit eine Sicherheitsschalteinrichtung mit einem Reset-Eingang zum Starten der Sicherheitsschalteinrichtung nach einem Auslösen ihrer Sicherheitsfunktion angegeben , wobei eine Auswerteschaltung mit dem Reset-Eingang verbunden ist, um das Anlegen eines Startsignals zu erfassen, und die Sicherheitsschalteinrichtung verschiedene Startmodi bereitstellt und ausgeführt ist, einen Startmodus in Übereinstimmung mit dem erfassten Startsignal auszuwählen, wobei die Auswerteschaltung eine Abtasteinrichtung umfasst, um das an dem Reset-Eingang anliegende Signal abzutasten und aus einer Folge von Abtastwerten zu erfassen.According to the invention, therefore, a safety switching device with a reset input for starting the safety switching device is specified after triggering its safety function, wherein an evaluation circuit is connected to the reset input in order to detect the application of a start signal, and the safety switching device provides and executes various start modes. selecting a start mode in accordance with the detected start signal, the evaluation circuit including sampling means for sampling the signal applied to the reset input and detecting it from a sequence of samples.

Grundgedanke der Erfindung ist somit, die Erfassung des analogen Startsignals mittels einer digitalen Abtastung durchzuführen, wobei dann das jeweilige Startsignal aus einer Folge von Abtastwerten erfasst wird. Die Länge der Folge kann abhängig von den Arten der definierten Startsignale gewählt werden und prinzipiell beliebig sein. Vorteilhaft ist es jedoch, aus einer möglichst kurzen Folge von Abtastwerten das jeweilige Startsignal zu erfassen, um einen schnellen Neustart zu ermöglichen. Die Abtastung kann mit beliebigen Parametern erfolgen, um sowohl einfache Signale wie auch komplexe Signale, beispielsweise wohl definiert Pegelverläufe, als Startsignal verwenden zu können. Die Anzahl der unterschiedlichen Startmodi kann durch die Auswahl der Parameter für die Abtastung des an dem Reset-Eingang anliegenden Signals praktisch beliebig hoch gesetzt werden. Mit einer Verlängerung der Zeitdauer der Abtastung und einer damit einhergehenden erhöhten Anzahl von Abtastwerten kann das Startsignal mit einer hohen Zuverlässigkeit erfasst werden, da kurzzeitige temporäre Abweichungen von dem Startsignal unberücksichtigt bleiben.The basic idea of the invention is thus to carry out the detection of the analog start signal by means of a digital scan, in which case the respective start signal is detected from a sequence of sampled values. The length of the sequence can be selected depending on the types of defined start signals and in principle be arbitrary. However, it is advantageous to record the respective start signal from as short a sequence of sample values as possible in order to enable a quick restart. The sampling can be done with arbitrary parameters in order to use both simple signals as well as complex signals, for example well-defined level curves, as a start signal can. The number of different start modes can be set practically arbitrarily high by selecting the parameters for sampling the signal applied to the reset input. With an increase in the duration of the sampling and an associated increased number of samples, the start signal can be detected with high reliability, since short-term temporary deviations from the starting signal are disregarded.

In vorteilhafter Ausgestaltung der Erfindung ist die Auswerteschaltung ausgeführt, einen Spannungspegel als Startsignal zu erfassen. In einer alternativen Ausführungsform der Erfindung ist die Auswerteschaltung ausgeführt, eine Spannungsflanke als Startsignal zu erfassen. In einer weiteren alternativen Ausführungsform ist die Auswerteschaltung ausgeführt, ein getaktetes Signal als Startsignal zu erfassen. Aufgrund der Flexibilität bei der Erfassung des Startsignals ist es möglich, verschiedene der oben genannten Startsignale in einer Auswerteschaltung zu erfassen. Die genannten Arten von Startsignalen sind einfach zu erzeugen und ermöglichen eine zuverlässige Erfassung durch die Auswerteschaltung. Eine Kombination der verschiedenen Signale ist ebenfalls möglich.In an advantageous embodiment of the invention, the evaluation circuit is designed to detect a voltage level as a start signal. In an alternative embodiment of the invention, the evaluation circuit is designed to detect a voltage edge as a start signal. In a further alternative embodiment, the evaluation circuit is designed to detect a clocked signal as a start signal. Due to the flexibility in detecting the start signal, it is possible to detect various of the above-mentioned start signals in an evaluation circuit. The types of start signals mentioned are easy to generate and enable reliable detection by the evaluation circuit. A combination of the different signals is also possible.

In weiterer Ausgestaltung der Erfindung ist der Reset-Eingang mit einem Spannungspegel vorgespannt. Die Vorspannung bildet einen Ruhepegel, sodass Abweichungen davon als Indikation eines Startsignals erkannt werden können. Insbesondere das Anlegen eines Massesignals kann leicht erfasst werden. Um die Sicherheitsschalteinrichtungen und deren Beschaltung einfach zu halten werden bevorzugt leicht verfügbare Spannungspegel zur Signalisierung verwendet. Dies betrifft neben der Masse eine bereitstehende Betriebsspannung. Bei einer Vorspannung mit einem dazwischenliegenden Spannungspegel kann durch das Vorspannen des Reset-Eingangs sowohl ein anliegendes Signal mit einem Massepegel wie auch mit einem Betriebsspannungspegel als Startsignal erfasst werden.In a further embodiment of the invention, the reset input is biased to a voltage level. The bias voltage forms a quiescent level, so that deviations from this can be recognized as the indication of a start signal. In particular, the application of a ground signal can be easily detected. In order to keep the safety switching devices and their wiring simple, preferably readily available voltage levels are used for signaling. this concerns in addition to the mass a waiting operating voltage. At a bias voltage with an intermediate voltage level, biasing the reset input can detect both an applied signal at a ground level and an operating voltage level as a start signal.

Gemäß einer bevorzugten Ausführungsform der Erfindung weist die Auswerteschaltung einen Spannungsteiler auf, über den der Abtasteinrichtung ein Teil des an dem Reset-Eingangs anliegenden Signals zum Abtasten zugeführt wird. Dies ermöglicht es, Startsignale mit im Wesentlichen beliebigen Spannungspegeln zu verwenden, da über den Spannungsteiler an der Abtasteinrichtung nur für diese geeignete Spannungspegel anliegen.According to a preferred embodiment of the invention, the evaluation circuit has a voltage divider, via which a part of the signal present at the reset input is supplied to the sampling device for sampling. This makes it possible to use start signals with substantially arbitrary voltage levels, since the voltage divider applied to the scanning device only for this appropriate voltage level.

In weiterer Ausgestaltung der Erfindung weist die Auswerteschaltung Mittel auf, um einen Abtast-Eingang der Abtasteinrichtung im Fehlerfall zu schützen. Derartige Mittel können beispielsweise Entkopplungsmittel sein, die den Reset-Eingang bei einem Kurzschluss von der Abtasteinrichtung entkoppelt. Derartige Kopplungsmittel können beispielsweise einen Kopplungswiderstand umfassen, der einen Strom zur Abtasteinrichtung begrenzt. Alternativ oder zusätzlich kann auch eine Entkopplungsdiode mit dem Eingang der Abtasteinrichtung verschaltet sein, um einen Spannungspegel an deren analogen Eingang zu begrenzen.In a further embodiment of the invention, the evaluation circuit has means to protect a scanning input of the scanning device in case of failure. Such means may for example be decoupling means, which decouples the reset input in the event of a short circuit from the scanning device. Such coupling means may comprise, for example, a coupling resistor which limits a current to the scanning device. Alternatively or additionally, a decoupling diode may also be connected to the input of the sampling device in order to limit a voltage level to its analog input.

In weiterer Ausgestaltung der Erfindung kann die Sicherheitsschalteinrichtung eine Überprüfungseinrichtung umfassen, die angeordnet und ausgeführt ist, an der Abtasteinrichtung verschiedene Startsignale bereitzustellen. Die Überprüfungseinrichtung kann die Startsignale unmittelbar an der Abtasteinrichtung bereitstellen, oder an einer beliebigen Stelle zwischen dem Reset-Eingang und der Abtasteinrichtung. Prinzipiell ist es auch möglich, dass die Überprüfungseinrichtung die verschiedenen Startsignale an einem Ausgangskontakt der Sicherheitsschalteinrichtung bereitstellt, und diese über eine externe Verkabelung dem Reset-Eingang zugeführt werden. Insbesondere in sicherheitsrelevanten Schalteinrichtungen ist auch die korrekte Funktion des Neustarts bzw. des Resets sicherzustellen, so dass eine Überprüfung dieser Funktion die Betriebssicherheit verbessert. Durch die Bereitstellung verschiedener Startsignale kann die Reaktion der Sicherheitsschalteinrichtung auf alle derartigen Startsignale überprüft werden. Die Sicherheitsschalteinrichtung kann eine Betätigungseinrichtung, beispielsweise in der Form eines Schalters oder Tasters umfassen, um eine Überprüfung der Auswerteschaltung durchzuführen, oder die Überprüfung wird über einen Signaleingang der Sicherheitsschalteinrichtung signalisiert und gestartet. Entsprechend kann auch eine Ausgabe des Überprüfungsergebnisses über den Signaleingang oder andere geeignete Ausgabemittel, beispielsweise eine optische Anzeige, erfolgen.In a further embodiment of the invention, the safety switching device may comprise a checking device, which is arranged and designed to provide different starting signals to the scanning device. The checking device can read the start signals directly at the scanning device or anywhere between the reset input and the scanner. In principle, it is also possible for the checking device to provide the various start signals at an output contact of the safety switching device, and these are supplied to the reset input via external cabling. In particular, in safety-relevant switching devices and the correct function of the restart or the reset is to ensure, so that a review of this function improves the reliability. By providing various start signals, the response of the safety switching device to all such start signals can be checked. The safety switching device may comprise an actuating device, for example in the form of a switch or a button, in order to carry out a check of the evaluation circuit, or the check is signaled and started via a signal input of the safety switching device. Correspondingly, an output of the check result via the signal input or other suitable output means, for example, a visual display, take place.

In einer bevorzugten Ausführungsform der Erfindung ist die Überprüfungseinrichtung angeordnet und ausgeführt, an der Abtasteinrichtung verschiedene Startsignale als modulierte Signale bereitzustellen. Durch die Modulation können verschiedene Startsignale einfach erzeugt werden, wobei gleichzeitig eine universelle Erzeugung von Startsignalen erfolgen kann. Beispielsweise kann die Überprüfungseinrichtung einen Ausgang haben, der mit einem Eingang der Abtasteinrichtung verbunden ist, um diesen Eingang entweder auf Masse oder einen vordefinierten Spannungspegel, beispielsweise Betriebsspannung, zu legen. Durch zeitliche Abfolge aus Spannungspegeln und Masse können beliebige Startsignale bereitgestellt werden. Wenn der Eingang der Abtasteinrichtung mit dem vordefinierten Spannungspegel vorgespannt ist, kann es ausreichen, den Eingang der Abtasteinrichtung über die Überprüfungseinrichtung auf Masse zu legen, um die Startsignale zu modulieren.In a preferred embodiment of the invention, the checking device is arranged and designed to provide different starting signals to the scanning device as modulated signals. Due to the modulation different start signals can be easily generated, at the same time a universal generation of start signals can be done. For example, the verifier may have an output connected to an input of the sampler to connect this input either to ground or to a predefined one Voltage level, for example, operating voltage to put. By temporal sequence of voltage levels and ground arbitrary start signals can be provided. If the input of the sampling device is biased at the predefined voltage level, it may be sufficient to ground the input of the sampling device via the checking device in order to modulate the starting signals.

In weiterer Ausgestaltung der Erfindung ist wenigstens eine Signalerzeugungseinheit vorgesehen und mit einem Ausgangskontakt der Sicherheitsschalteinrichtung verbunden, um an dem Reset-Eingang ein Startsignal bereitzustellen. Das von der Signalerzeugungseinheit bereitgestellte Signal wird über eine angeschlossene Schaltung an die Sicherheitsschalteinrichtung, genauer an ihren Reset-Eingang, zurückgeleitet, um als Startsignal erfasst zu werden. Durch die Vorgabe der Signale durch die Signalerzeugungseinheit wird sichergestellt, dass nur geeignete Signale als Startsignale an dem Reset-Eingang angelegt werden. Fehler, die sich durch eine externe Erzeugung der Startsignale ergeben, werden vermieden. Die Signalerzeugungseinheit kann beispielsweise einen Spannungspegel oder ein Taktsignal erzeugen, die zur Erzeugung von Startsignalen verwendbar sind.In a further embodiment of the invention, at least one signal generating unit is provided and connected to an output contact of the safety switching device to provide a start signal to the reset input. The signal provided by the signal generation unit is returned via a connected circuit to the safety switching device, more precisely to its reset input, in order to be detected as a start signal. The specification of the signals by the signal generation unit ensures that only suitable signals are applied as start signals to the reset input. Errors resulting from external generation of the start signals are avoided. For example, the signal generation unit may generate a voltage level or a clock signal that can be used to generate start signals.

Gemäß einer weiteren Ausführungsform der vorliegenden Erfindung ist eine Mehrzahl Signalerzeugungseinheiten vorgesehen und mit jeweils einem Ausgangskontakt der Sicherheitsschalteinrichtung verbunden, wobei die Ausgangskontakte der Signalerzeugungseinheiten zusammenschaltbar sind, um an dem Reset-Eingang ein vorgegebenes Signal bereitzustellen. Beispielsweise kann eine Signalerzeugungseinheit wenigstens einen konstanten Spannungspegel bereitstellen, und eine weitere Signalerzeugungseinheit ein getaktetes Signal, das mit dem konstanten Spannungspegel überlagert wird.According to a further embodiment of the present invention, a plurality of signal generating units is provided and each connected to an output contact of the safety switching device, wherein the output contacts of the signal generating units are interconnected to provide a predetermined signal at the reset input. For example, a signal generation unit can have at least one constant Provide voltage levels, and another signal generating unit a clocked signal, which is superimposed on the constant voltage level.

In weiterer Ausgestaltung der Erfindung ist die Sicherheitsschalteinrichtung ein Sicherheitsrelais.In a further embodiment of the invention, the safety switching device is a safety relay.

Nachfolgend wird die Erfindung unter Bezugnahme auf die anliegende Zeichnung anhand bevorzugter Ausführungsformen näher erläutert.The invention will be explained in more detail with reference to the accompanying drawings with reference to preferred embodiments.

Es zeigen

Fig. 1
ein schematisches Schaltbild einer Sicherheitsschalteinrichtung mit einer Auswerteschaltung, einer Überprüfungsschaltung, einer Energieversorgungseinheit und zwei Signalerzeugungseinheiten,
Fig. 2
eine externe Beschaltung der Sicherheitsschalteinrichtung aus Figur 1 zum Anlegen eines Startsignals mit einem Betriebsspannungspegel an den Reset-Eingang der Sicherheitsschalteinrichtung,
Fig. 3
eine externe Beschaltung der Sicherheitsschalteinrichtung aus Figur 1 zum Anlegen eines Startsignals mit einem Massepegel an den Reset-Eingang der Sicherheitsschalteinrichtung,
Fig. 4
eine externe Beschaltung der Sicherheitsschalteinrichtung aus Figur 1 zum Anlegen eines Startsignals von der ersten Signalerzeugungseinheit an den Reset-Eingang der Sicherheitsschalteinrichtung, und
Fig. 5
eine externe Beschaltung der Sicherheitsschalteinrichtung aus Figur 1 zum Anlegen eines Startsignals von der zweiten Signalerzeugungseinheit an den Reset-Eingang der Sicherheitsschalteinrichtung.
Show it
Fig. 1
FIG. 2 a schematic circuit diagram of a safety switching device with an evaluation circuit, a checking circuit, a power supply unit and two signal generating units, FIG.
Fig. 2
an external wiring of the safety switching device FIG. 1 for applying a start signal with an operating voltage level to the reset input of the safety switching device,
Fig. 3
an external wiring of the safety switching device FIG. 1 for applying a start signal with a ground level to the reset input of the safety switching device,
Fig. 4
an external wiring of the safety switching device FIG. 1 for applying a start signal from the first Signal generation unit to the reset input of the safety switching device, and
Fig. 5
an external wiring of the safety switching device FIG. 1 for applying a start signal from the second signal generation unit to the reset input of the safety switching device.

Figur 1 zeigt eine Sicherheitsschalteinrichtung 1, in der verschiedene Baugruppen die Erfindung betreffend schematisch dargestellt sind. Die Sicherheitsschalteinrichtung 1 ist zur Durchführung mehrerer, unterschiedlicher Startmodi ausgeführt, mit denen die Sicherheitsschalteinrichtung 1 nach einem Auslösen ihrer Sicherheitsfunktion gestartet werden kann. FIG. 1 shows a safety switching device 1, in which various modules relating to the invention are shown schematically. The safety switching device 1 is designed to carry out a plurality of different starting modes with which the safety switching device 1 can be started after triggering its safety function.

Die Sicherheitsschalteinrichtung 1 umfasst eine Auswerteschaltung 2, die mit einem analogen Reset-Eingang IN der Sicherheitsschalteinrichtung 1 verbunden ist. Die Auswerteschaltung 2 umfasst eine Eingangsschaltung 3 und eine Abtasteinrichtung 4, die in Fig. 1 als Logik bezeichnet ist. Die Eingangsschaltung 3 umfasst eine nicht gezeigte Vorspannungsquelle, die den Reset-Eingang IN über einen Widerstand R1 und eine Diode D1 mit einer Vorspannung V1 vorspannt. Der Spannungspegel der Vorspannung V1 liegt zwischen Masse und einer Betriebsspannung, hier auch als Vcc bezeichnet, und beträgt in diesem Ausführungsbeispiel die Hälfte der Betriebsspannung Vcc.The safety switching device 1 comprises an evaluation circuit 2, which is connected to an analog reset input IN of the safety switching device 1. The evaluation circuit 2 comprises an input circuit 3 and a sampling device 4, which in Fig. 1 is called logic. The input circuit 3 includes a bias source, not shown, which biases the reset input IN through a resistor R1 and a diode D1 with a bias voltage V1. The voltage level of the bias voltage V1 is between ground and an operating voltage, also referred to herein as Vcc, and in this embodiment is half the operating voltage Vcc.

Weiterhin umfasst die Eingangsschaltung 3 einen Spannungsteiler 5 mit zwei Widerständen R2, R3, zwischen denen ein Potential V2 abgegriffen wird. Das Potential V2 entspricht somit dem jeweils an dem Reset-Eingang IN anliegenden Potential, ist jedoch für einen Abtasteingang AI der Abtasteinrichtung 4 als Eingangspegel geeignet.Furthermore, the input circuit 3 comprises a voltage divider 5 with two resistors R2, R3, between which a potential V2 is tapped. The potential V2 thus corresponds to the respective one at the reset input IN applied potential, however, is suitable for a sampling input AI of the scanning device 4 as an input level.

Zusätzlich weist die Eingangsschaltung 3 als Schutz für die Abtasteinrichtung 4 einen Widerstand R4 und eine Diode D2 auf, über welche das Potential V2 des Spannungsteilers 5 mit dem Abtasteingang AI der Abtasteinrichtung 4 verbunden ist. Der Widerstand R4 ist als Entkoppelwiderstand in der Verbindung des Potentials V2 mit dem Abtasteingang AI ausgeführt, während die Diode D2 über Masse mit dieser Verbindung gekoppelt ist, um einen Pegel an dem Abtasteingang AI der Abtasteinrichtung 4 zu begrenzen. Der Widerstand R4 fängt somit den Fehlerfall eines Kurzschlusses des Widerstands R2 des Spannungsteilers 5 auf, während die Diode D2 bei einem Fehler des Widerstands R1 eine Begrenzung der Eingangsspannung an dem Abtasteingang AI der Abtasteinrichtung 4 bewirkt.In addition, the input circuit 3 as protection for the scanning device 4, a resistor R4 and a diode D2, via which the potential V2 of the voltage divider 5 to the sampling input AI of the scanning device 4 is connected. The resistor R4 is designed as a decoupling resistor in the connection of the potential V2 with the sampling input AI, while the diode D2 is coupled via ground to this connection in order to limit a level at the sampling input AI of the sampling device 4. The resistor R4 thus begins the fault case of a short circuit of the resistor R2 of the voltage divider 5, while the diode D2 causes a limitation of the input voltage at the sampling input AI of the scanning device 4 in the event of an error of the resistor R1.

Die Sicherheitsschalteinrichtung 1 umfasst weiterhin eine Überprüfungseinrichtung 6, in Fig. 1 auch als Test bezeichnet, die über einen Widerstand R5 mit dem Abtasteingang AI der Abtasteinrichtung 4 verbunden ist. Sowohl die Abtasteinrichtung 4 wie auch die Überprüfungseinrichtung 6 sind jeweils mit der Betriebsspannung Vcc und der Masse der Sicherheitsschalteinrichtung 1 verbunden.The safety switching device 1 further comprises a checking device 6, in FIG Fig. 1 Also referred to as a test, which is connected via a resistor R5 to the sampling input AI of the scanning device 4. Both the scanning device 4 and the checking device 6 are each connected to the operating voltage Vcc and the ground of the safety switching device 1.

Die Abtasteinrichtung 4 ist ausgeführt, um über die Eingangsschaltung 3 ein an dem Reset-Eingang IN anliegendes analoges Signal abzutasten und daraus ein Startsignal zu erfassen. Dazu wird eine Folge von Abtastwerten ausgewertet, und im Fall der Erfassung eines Startsignals eine Mitteilung an eine hier nicht gezeigte Steuereinrichtung der Sicherheitsschalteinrichtung 1 gesendet. Die Auswerteschaltung 2 ist dabei ausgeführt, sowohl Spannungspegel, Spannungsflanken als auch getaktete Signale als Startsignale zu erfassen. Durch die Vorspannung des Reset-Eingangs IN kann sowohl das Anlegen von Masse wie auch eines von der Vorspannung V1 unterschiedlichen Spannungspegels durch die Abtasteinrichtung 4 erfasst werden. Die Sicherheitsschalteinrichtung 1 wählt einen Startmodus in Übereinstimmung mit dem erfassten Startsignal aus, um nach dem Auslösen ihrer Sicherheitsfunktion einen Neustart durchzuführen.The scanning device 4 is designed to scan via the input circuit 3 a signal applied to the reset input IN analog signal and to detect a start signal. For this purpose, a sequence of samples is evaluated, and in the case of detection of a start signal, a message to a control device of the safety switching device 1, not shown here Posted. The evaluation circuit 2 is designed to detect both voltage levels, voltage edges and clocked signals as start signals. By the bias of the reset input IN, both the application of ground as well as a different voltage level from the bias voltage V1 can be detected by the scanning device 4. The safety switch device 1 selects a start mode in accordance with the detected start signal to restart after the triggering of its safety function.

Die Überprüfungseinrichtung 6 ist ausgeführt, über den Widerstand R5 an dem Abtasteingang AI der Abtasteinrichtung 4 verschiedene Startsignale als modulierte Signale anzulegen. Dazu wird ein an dem Abtasteingang AI anliegender Spannungspegel V3 über den Widerstand R5 durch Anlegen der Betriebsspannung Vcc bzw. Masse angehoben oder gesenkt, um so verschiedene Startsignale zu erzeugen. Die Abtasteinrichtung 4 ist mit der Überprüfungseinrichtung 6 verbunden, um das erfasste Startsignal zu dieser übertragen zu können, so dass Überprüfungseinrichtung 6 das erzeugte Startsignal mit dem von der Abtasteinrichtung 4 erfassten Startsignal vergleichen kann, um die Funktion der Abtasteinrichtung 4 zu überprüfen.The checking device 6 is designed to apply different start signals as modulated signals via the resistor R5 to the sampling input AI of the sampling device 4. For this purpose, a voltage applied to the sampling input AI voltage level V3 is raised or lowered via the resistor R5 by applying the operating voltage Vcc or ground, so as to produce different start signals. The scanning device 4 is connected to the checking device 6 in order to be able to transmit the detected start signal to the latter, so that the checking device 6 can compare the generated starting signal with the starting signal detected by the scanning device 4 in order to check the function of the scanning device 4.

Die Sicherheitsschalteinrichtung 1 umfasst weiterhin eine Energieversorgungseinheit 7, die mit zwei Versorgungseingängen A1, A2 der Sicherheitsschalteinrichtung 1 verbunden ist. Die Energieversorgungseinheit 7 wird an eine Energiequelle 11 angeschlossen, um die Sicherheitsschalteinrichtung 1 mit Energie zu versorgen, wie in den Figuren 2 bis 5 zu sehen ist. Die Energieversorgungseinheit 7 liefert die Betriebsspannung Vcc.The safety switching device 1 further comprises a power supply unit 7, which is connected to two supply inputs A1, A2 of the safety switching device 1. The power supply unit 7 is connected to a power source 11 to power the safety switch device 1, as in FIGS FIGS. 2 to 5 you can see. The power supply unit 7 supplies the operating voltage Vcc.

Weiterhin umfasst die Sicherheitsschalteinrichtung zwei Signalerzeugungseinheiten 8, 9, die als erster und zweiter Takterzeuger ausgeführt sind. Die beiden Signalerzeugungseinheiten 8, 9 sind mit entsprechenden Taktausgängen T0, T1 der Sicherheitsschalteinrichtung 1 verbunden, und stellen darüber verschiedene Taktsignale bereit. Die Takterzeugung in den Signalerzeugungseinheiten 8, 9 wird über die Abtasteinrichtung 4 gesteuert.Furthermore, the safety switching device comprises two signal generating units 8, 9, which are designed as first and second clock generator. The two signal generating units 8, 9 are connected to corresponding clock outputs T0, T1 of the safety switching device 1, and provide different clock signals over it. The clock generation in the signal generating units 8, 9 is controlled by the scanner 4.

Unter Bezug auf die Figuren 2 bis 5 werden nunmehr externe Beschaltungen der Sicherheitsschalteinrichtung mit verschiedenen Verschaltungsmöglichkeiten an dem Reset-Eingang IN der Sicherheitsschalteinrichtung 1 gezeigt. Die externe Beschaltung umfasst jeweils eine Betätigungseinrichtung 10, über die das entsprechende Startsignal an dem Reset-Eingang IN bei Betätigung angelegt wird. Die Betätigungseinrichtung 10 kann als elektrischer Schalter oder Taster ausgeführt sein. Die Energiequelle 11 ist jeweils über die Versorgungseingänge A1, A2 mit der Sicherheitseinschaltung 1 verbunden und liefert einen Pegel von 24 V.With reference to the FIGS. 2 to 5 now external circuits of the safety switching device are shown with different Verschaltungsmöglichkeiten to the reset input IN of the safety switching device 1. The external circuitry each comprises an actuator 10, via which the corresponding start signal is applied to the reset input IN when actuated. The actuating device 10 may be designed as an electrical switch or button. The power source 11 is connected to the safety input 1 via the supply inputs A1, A2, respectively, and supplies a level of 24 V.

Die Figuren 2 und 3 zeigen das Anlegen von Gleichspannungen mit unterschiedlichen Pegeln an den Reset-Eingang IN. Der jeweilige Pegel wird von der Energiequelle 11 bereitgestellt. In diesem Ausführungsbeispiel soll gemäß Figur 2 der Pegel von 24V einen manuell überwachten Reset in der Sicherheitsschalteinrichtung 1 auslösen, während gemäß Figur 3 der Pegel auf Masse liegt und einen automatischen Reset auslöst.The FIGS. 2 and 3 show the application of DC voltages with different levels to the reset input IN. The respective level is provided by the power source 11. In this embodiment, according to FIG. 2 the level of 24V triggers a manually monitored reset in the safety switching device 1, while according to FIG. 3 the level is at ground and triggers an automatic reset.

Gemäß den Figuren 4 und 5 wird ein Taktsignal als Startsignal verwendet, das wie zuvor beschrieben über die Betätigungseinrichtung 10 an den Reset-Eingang IN angelegt wird. Das Taktsignal in Figur 4 wird über den Taktausgang T0 abgegriffen, während gemäß Figur 5 das Taktsignal am Taktausgang T1 abgegriffen wird. In diesem Ausführungsbeispiel soll das gemäß Figur 4 bereitgestellte Startsignal einen manuell überwachten Reset mit verzögertem Start und das Startsignal gemäß Figur 5 einen automatischen Reset mit verzögertem Start bewirken.According to the FIGS. 4 and 5 a clock signal is used as a start signal, as described above on the Actuator 10 is applied to the reset input IN. The clock signal in FIG. 4 is tapped via the clock output T0, while according to FIG. 5 the clock signal is tapped at the clock output T1. In this embodiment, the according to FIG. 4 provided start signal a manually monitored reset with a delayed start and the start signal according to FIG. 5 cause an automatic reset with a delayed start.

Die Zuordnung der Startsignale zu den verschiedenen Startmodi gemäß den Figuren 2 bis 5 ist rein willkürlich. Andere Zuordnungen sind ebenfalls möglich. Auch die Auswahl der hier genannten Startmodi ist rein willkürlich. Ebenfalls können über die Auswahl der Signalquelle für den Reset andere Applikationen ausgewählt werden, beispielsweise Applikationen mit oder ohne Abfallverzögerung.The assignment of the start signals to the different start modes according to the FIGS. 2 to 5 is purely arbitrary. Other assignments are also possible. Also, the selection of the start modes mentioned here is purely arbitrary. Likewise, other applications can be selected via the selection of the signal source for the reset, for example applications with or without waste delay.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

SicherheitsschalteinrichtungSafety switching device
11
Auswerteschaltungevaluation
22
Eingangsschaltunginput circuit
33
Abtasteinrichtungscanning
44
Spannungsteilervoltage divider
55
ÜberprüfungseinrichtungChecking device
66
EnergieversorgungseinheitPower supply unit
77
SignalerzeugungseinheitSignal generation unit
88th
SignalerzeugungseinheitSignal generation unit
99
Betätigungseinrichtungactuator
1010
Energiequelleenergy
1111
Abtast-EingangSense input
AIAI
Versorgungseingangsupply input
A1A1
Versorgungseingangsupply input
A2A2
Diodediode
D1D1
Diodediode
D2D2
Reset-EingangReset input
ININ
Widerstandresistance
R1R1
Widerstandresistance
R2R2
Widerstandresistance
R3R3
Widerstandresistance
R4R4
Widerstandresistance
R5R5
Taktausgangclock output
T0T0
Taktausgangclock output
T1T1
Vorspannungpreload
V1V1
Potentialpotential
V2V2
Spannungspegelvoltage level
V3V3
Betriebsspannungoperating voltage
VccVcc

Claims (12)

  1. A safety switching device (1) having a reset input (IN) for starting the safety switching device (1) after the safety function thereof has been triggered,
    an evaluation circuit (2) being connected to the reset input (IN) to detect the application of a start signal, and
    the safety switching device (1) providing different start modes and being designed to select a start mode in agreement with the detected start signal,
    characterized in that
    the evaluation circuit (2) comprises a sampling device (4) so as to sample the signal that is present at the reset input (IN) and detect the same from a sequence of sampled values.
  2. The safety switching device (1) according to claim 1,
    characterized in that
    the evaluation circuit (2) is designed to detect a voltage level as the start signal.
  3. The safety switching device (1) according to either claim 1 or 2, characterized in that
    the evaluation circuit (2) is designed to detect a voltage edge as the start signal.
  4. The safety switching device (1) according to any one of the preceding claims, characterized in that
    the evaluation circuit (2) is designed to detect a clock signal as the start signal.
  5. The safety switching device (1) according to any one of the preceding claims, characterized in that
    the reset input (IN) is biased to a voltage level.
  6. The safety switching device (1) according to any one of the preceding claims, characterized in that
    the evaluation circuit (2) comprises a voltage divider (5) via which a portion of the signal that is present at the reset input (IN) is supplied to the sampling device (4) for sampling.
  7. The safety switching device (1) according to any one of the preceding claims, characterized in that
    the evaluation circuit (2) comprises means (D2, R4) to protect a sampling input (AI) of the sampling device (4) in the event of a fault.
  8. The safety switching device (1) according to any one of the preceding claims, characterized in that
    the safety switching device (1) comprises a checking device (6), which is disposed and designed to provide different start signals at the sampling device (4).
  9. The safety switching device (8) according to claim 8, characterized in that
    the checking device (6) is disposed and designed to provide different start signals at the sampling device as modulated signals.
  10. The safety switching device (1) according to any one of the preceding claims, characterized in that
    at least one signal generating unit (8, 9) is provided and connected to an output contact (T0, T1) of the safety switching device (1) so as to provide a start signal at the reset input (IN).
  11. The safety switching device (1) according to claim 10, characterized in that
    a plurality of signal generating units (8, 9) are provided and each is connected to an output contact (T0, T1) of the safety switching device (1), wherein the output contacts (T0, T1) of the signal generating units (8, 9) can be interconnected so as to provide a predefined signal at the reset input (IN).
  12. The safety switching device (1) according to any one of the preceding claims, characterized in that
    the safety switching device (1) is a safety relay.
EP12180866.1A 2011-08-18 2012-08-17 Safety switching device Active EP2560180B1 (en)

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DE201110052810 DE102011052810A1 (en) 2011-08-18 2011-08-18 SAFETY SWITCHING DEVICE

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WO2019128662A1 (en) * 2017-12-27 2019-07-04 上海辰竹仪表有限公司 Intelligent safety relay and circuits applied thereby

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DE102004010852A1 (en) * 2004-03-05 2005-11-17 Infineon Technologies Ag IC with normal operation and configuration operation has the clocking signal derived from the external power supply feed
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DE102010060415B4 (en) 2010-11-08 2015-11-12 Phoenix Contact Gmbh & Co. Kg Safety relay and method for switching a safety relay

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EP2560180A3 (en) 2014-02-05
EP2560180A2 (en) 2013-02-20
ES2574410T3 (en) 2016-06-17

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