EP2595010B1 - Input circuit for a safety switching device, safety circuit with a safety switching device and such an input circuit, and method for monitoring a number of safety functions - Google Patents
Input circuit for a safety switching device, safety circuit with a safety switching device and such an input circuit, and method for monitoring a number of safety functions Download PDFInfo
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- EP2595010B1 EP2595010B1 EP20120193482 EP12193482A EP2595010B1 EP 2595010 B1 EP2595010 B1 EP 2595010B1 EP 20120193482 EP20120193482 EP 20120193482 EP 12193482 A EP12193482 A EP 12193482A EP 2595010 B1 EP2595010 B1 EP 2595010B1
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- safety
- circuit
- sensor circuit
- circuits
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- 238000012544 monitoring process Methods 0.000 title claims description 22
- 238000000034 method Methods 0.000 title claims description 7
- 230000004888 barrier function Effects 0.000 claims description 4
- 239000004020 conductor Substances 0.000 description 10
- 230000001681 protective effect Effects 0.000 description 3
- 230000011664 signaling Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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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
- H01H47/002—Monitoring or fail-safe circuits
Definitions
- the present invention relates to an input circuit for a safety switching device, wherein the safety switching device has a plurality of control contacts and a plurality of safety contacts for this nachschaltbare output circuits and the output circuits are independently controllable by applicable to the control contacts switching signals, the input circuit having a plurality of sensor circuits for generating the switching signals , And each sensor circuit is designed for connection to a plurality of control contacts of the safety relay.
- the invention relates to a safety circuit with an above-mentioned input circuit and a safety switching device, the safety switching device having a plurality of control contacts and a plurality of safety contacts for this nachschaltbare output circuits and the output circuits are independently controllable by applicable to the control contacts switching signals, wherein the safety switching device to the input circuit is connected. Furthermore, the invention relates to a method for monitoring a plurality of safety functions with such a safety circuit.
- Safety circuits are used in installations of electrical equipment or machines to monitor various safety functions. These safety functions include an emergency shutdown with an emergency stop switch, for example as a button, and door or area monitoring with Protective door switches, light barriers, light curtains or the like.
- the input circuit accordingly includes various sensor circuits for monitoring the safety functions.
- the safety relay detects switching signals generated by the sensor circuits and controls the output circuits accordingly.
- Such an input circuit is from the EP 1 566 873 A2 known.
- safety switching devices are designed to monitor only a few sensor circuits and are provided, for example, in a 22.5 mm wide housing. This type of housing is widely used.
- the safety switching devices accordingly have control contacts for the connection to the at least one sensor circuit and safety contacts for the connection to the at least one output circuit. With such safety switching devices, the stop category 0 and the highest safety category 4 can be achieved.
- the invention is therefore the object of an input circuit, a Specify a safety circuit and a method for monitoring a plurality of safety functions with a safety switching device, wherein a plurality of safety functions can be monitored easily and inexpensively.
- an input circuit for a safety switching device wherein the safety switching device has a plurality of control contacts and a plurality of safety contacts for these nachschaltbare output circuits and the output circuits are independently controllable by applicable to the control contacts switching signals
- the input circuit comprises a plurality of sensor circuits for generating the switching signals and each sensor circuit is designed for connection to a plurality of control contacts of the safety switching device
- the input circuit comprises a main sensor circuit with a plurality of channels for connection to two control contacts, wherein the main sensor circuit is arranged in a superordinate plane and connected to the plurality of sensor circuits, that in each case a channel of the main sensor circuit having a sensor circuit has a common control contact.
- a safety circuit comprising an above-mentioned input circuit and a safety switching device, wherein the safety switching device has a plurality of control contacts and a plurality of safety contacts for this nachschaltbare Having output circuits and the output circuits are independently controllable by applicable to the control contacts switching signals, the safety switching device connected to the input circuit and is designed to control each output circuit individually when generating a switching signal in a corresponding sensor circuit, and all output circuits together when generating a switching signal in to control the main sensor circuit.
- the object is achieved by a method for monitoring a plurality of safety functions with a safety circuit specified above, wherein a safety function represents a higher-level safety function, in particular an emergency stop monitoring, the higher-level safety function is monitored in the main sensor circuit, and remaining safety functions in the sensor circuits are monitored.
- a safety function represents a higher-level safety function, in particular an emergency stop monitoring
- the higher-level safety function is monitored in the main sensor circuit, and remaining safety functions in the sensor circuits are monitored.
- the basic idea of the present invention is thus to organize and interconnect sensor circuits and a main sensor circuit such that a plurality of safety functions can be implemented which exceed the number of safety functions provided by the safety switching device.
- a higher-level safety function for example an emergency stop monitoring with an emergency stop button, is executed with a multichannel main sensor circuit, wherein in each case one channel of the main sensor circuit is connected to one of the sensor circuits according to the invention.
- a switching signal for controlling downstream of the safety switching device output circuits be generated when either the respective sensor circuit or the parent main sensor circuit generate the switching signal.
- each sensor circuit can cause control of at least one output circuit as usual by generating a switching signal.
- the hierarchical arrangement of the main sensor circuit and sensor circuits ensures that all safety functions can be effectively monitored and all output circuits can be effectively controlled.
- Switching signals are preferably potential changes, for example the application or removal of a potential.
- the control of the output circuits includes a drive as well as a driving, and may be performed differently for a plurality of output circuits.
- a single safety relay can be used with small dimensions, so that no additional space in a cabinet is required. Existing plants can easily be extended in this way.
- a channel of the main sensor circuit or of the sensor circuit comprises a conductor loop with a switching element for interrupting or short-circuiting the conductor loop.
- the switching elements may be any known in the art switches, such as manually operated emergency stop, safety switches that are operated, for example, when opening a maintenance cover of the system, safety door switch or electrical switch, such as magnetic or light barriers or light curtains.
- the switching elements can each be designed individually as an opener or closer.
- the conductor loop is connected or connectable to two control contacts of the safety relay. Actuation of this switching element activates a safety function so that one, several or all output circuits are controlled.
- the switching elements coupled and thus operated together, for example by an emergency stop switch.
- the safety switching device is preferably designed such that it carries a potential at one of the control contacts of a conductor loop, and monitors the potential at the other of the control contacts in order to detect an actuation of the respective switching element.
- the common control contact of the potential-leading control contact so that the operation of the switching element of the main sensor circuit or the respective subordinate sensor circuit can be detected individually.
- the number of sensor circuits corresponds to the number of downstream output circuits. This allows a 1: 1 assignment of sensor circuits and nachschaltbaren output circuits, so that each output circuit is controlled individually by a sensor circuit.
- the main sensor circuit is designed with two channels and the input circuit comprises two sensor circuits.
- the resulting input circuit can be realized with little effort by its simple structure.
- the corresponding safety circuit can be carried out using a safety relay with small dimensions, so that overall results in a compact design.
- safety switching devices can be expanded by the combination with the input circuit of the invention of the monitoring of two safety functions with two sensor circuits on the monitoring of a total of three safety functions in the two sensor circuits and the main sensor circuit.
- the safety circuit is especially for Monitoring of small to medium-sized plants or machines suitable because the required safety functions can be realized inexpensively and with little effort.
- the plurality of sensor circuits are each multi-channel, and the main sensor circuit is connected to the plurality of sensor circuits in such a way that in each case one channel of the main sensor circuit has a common control contact with one channel of the sensor circuit.
- the corresponding channel of the main sensor circuit thus has a common control contact with one of the channels of the sensor circuit.
- the multi-channel design of sensor circuits makes it possible to monitor safety functions with a high level of safety.
- an output circuit is controlled in the corresponding safety circuit as soon as a channel of the respective sensor circuit generates the switching signal.
- the common actuation switching elements are coupled together to provide redundancy in the sensor circuit. The higher-level monitoring of the safety function by the main sensor circuit remains unaffected by the multichannel execution of the subordinate sensor circuits.
- the plurality of sensor circuits is designed with two channels. This is usually sufficient to reliably monitor safety functions, so that the input circuit and the corresponding safety circuit as a whole have a compact design.
- the safety relay is preferably executed, each Control output circuit individually when generating a switching signal in a channel of the corresponding sensor circuit.
- the main sensor circuit is designed for emergency stop monitoring.
- the emergency stop monitoring causes a shutdown of the entire system or machine and is therefore particularly suitable as a higher-level safety function for monitoring in the main sensor circuit.
- the emergency stop monitoring can be implemented by a corresponding emergency stop switch.
- the majority of the sensor circuits are designed to monitor at least one protective door and / or at least one light barrier and / or at least one light grid.
- Different switching elements can be used depending on the respective intended use or on the respective safety function to be monitored.
- the switching elements can be designed as desired mechanically, magnetically or electrically.
- Each sensor circuit can be designed individually with a different switching element.
- the safety switching device has a plurality of control contacts for each sensor circuit and an additional control contact for the respective channel of the main sensor circuit, wherein a control contact of the sensor circuit is connected to the respective channel of the main sensor circuit. Accordingly, the higher-level safety function can be implemented via the main sensor circuit with only one additional control contact for each sensor circuit.
- the additional Control contact together with the control contact which is used together with a channel of the sensor circuit, connecting points for the conductor loop of the respective channel of the main sensor circuit. This allows the use of a safety relay with compact dimensions and is therefore well suited for use in small machines or systems with small control cabinets.
- control contact of the sensor circuit which is connected to the respective channel of the main sensor circuit, is a potential-conducting control contact.
- the potential-carrying control contact provides a voltage which generates a switching signal in the form of a potential change upon actuation of the respective switching element.
- This switching signal is applied from the potential-carrying control contact via the conductor loop of the channel of the main sensor circuit or the respective sensor circuit to a control contact and detected by the safety relay. In this way it can be determined whether the switching signal for controlling the corresponding output circuit has been generated by the sensor circuit or the higher-order main sensor circuit.
- the safety switching device is connected to a plurality of output circuits in accordance with the number of sensor circuits, each output circuit being controlled individually by a sensor circuit and all output circuits being controlled jointly by the main sensor circuit.
- the common control of the output circuits by the main sensor circuit allows the addition of an additional, higher-level safety function, wherein Each output circuit is individually controllable by a sensor circuit.
- the assignment of output circuits and sensor circuits is in principle arbitrary.
- the safety relay of the safety circuit is designed to perform the control of the output circuits as indicated. In principle, it is also possible for a plurality of output circuits to be jointly controlled by a sensor circuit, these dependent output circuits forming an independent output circuit in the sense of this embodiment.
- the Fig. 1 shows a hierarchical arrangement of a main sensor circuit 1 and two sensor circuits 2 according to the present invention. As in Fig. 1 is shown, the two sensor circuits 2 each act independently on separate output circuits 3 in order to control them. In addition, the main sensor circuit 1 cooperates with both output circuits 3 to control them.
- Fig. 2 shows a security circuit 4 according to the present invention.
- the safety circuit 4 comprises an input circuit 5 and a safety switching device 6.
- the input circuit 5 comprises in accordance with Fig. 1 the higher-order main sensor circuit 1 and the two hierarchically arranged below sensor circuits 2.
- the safety switching device 6 further comprises a plurality of control contacts 7, which are connected to the sensor circuits 2 and the main sensor circuit 1, and a plurality of safety contacts 8, wherein the output circuits 3 are connected downstream of the safety contacts 8 ,
- Each sensor circuit 2 and the main sensor circuit 1 each comprise two conductor loops 9 which each form a channel 9 of the respective sensor circuit 2 or main sensor circuit 1 and are connected to two control contacts 7 of the safety switching device 6.
- a switching element 10 is arranged, which is designed as an opener, wherein the switching elements 10 of each sensor circuit 2 and the main sensor circuit 1 are coupled together in a manner not shown for common operation.
- the switching element 10 is designed as a closer.
- one of the control contacts 7, which are connected to a conductor loop 9, is designed as a potential-carrying safety contact 7.
- the safety switching device 6 is further designed to check on the other control contact 7 an applied potential.
- a channel 9 of the main sensor circuit 1 is in each case connected to a channel 9 of a sensor circuit 2 in such a way that they are connected together to a potential-carrying control contact 7 of the safety switching device 6.
- the safety circuit 4 of the described embodiment is designed to monitor three safety functions.
- the main sensor circuit 1 is designed for emergency stop monitoring as a higher-level safety function, wherein the switching elements 10 of the main sensor circuit 1 is actuated by an emergency stop switch, not shown.
- the sensor circuits 2 are designed to monitor two further independent safety functions.
- the sensor circuits 2 are designed for monitoring a protective door or a light grid. Accordingly, the switching elements 10 of the one sensor circuit 2 are actuated electrically by the light grid by a mechanical switch and the switching elements 10 of the other sensor circuit 2.
- the safety switching element 6 comprises a switching logic 11 which, starting from applied to the control contacts 7 switching signals, two breakers 12 independently controls the output contacts 3 downstream of the safety contacts 8 in accordance with the illustration in FIG Fig. 1 to control independently of each other.
- the safety switching device 6 has two supply contacts 13, via which the safety switching device 6 is supplied with a 24V voltage. Furthermore, the safety switching device 6 comprises two reset contacts 14, via which the safety switching device 6 can be reset after the triggering of a safety function. In this case, one of the output circuits 3 can be individually reset via each of the reset contacts 14, that is to say the corresponding output circuit 3 is activated. Also, the safety switching device 6 for Each output circuit 3 to a signaling contact 15 via which the control of an output circuit 3 is displayed.
- the safety circuit 4 monitors, as in Fig. 2 is shown schematically, two safety circuits 16, each associated with an output circuit 3. Each safety circuit 16 corresponds to a sensor circuit 2, via which upon actuation of the corresponding switching elements 10 belonging to the respective safety circuit 16 output circuit 3 is controlled individually. Additionally is in Fig. 2 a superordinate main safety circuit 17 is shown schematically, which includes both safety circuits 16 and associated with the main sensor circuit 1.
- the switching element 10 By the switching element 10, the potential of the potential-carrying control contact 7 is applied to the respective other control contact 7 for the corresponding channel 9. This is detected as a switching signal from the switching logic 11.
- the switching logic 11 determines based on the control contact 7, to which the switching signal is applied, which sensor circuit 2 has generated the switching signal, or whether the switching signal from the main sensor circuit 1 has been generated. Accordingly, the switching logic 11 controls the breakers 12 individually.
- the switching logic 11 controls accordingly upon detection of a switching signal in one of the channels 9 of a sensor circuit 2 individually the breaker 12 for controlling the sensor circuit 2 associated output circuit 3.
- When detecting a corresponding switching signal in one of the channels 9 of the main sensor circuit 1 controls the control logic eleventh both output circuits 3 via the two breakers 12 together.
- the breaker 12 is when controlling in each case a message signal is applied to the corresponding signaling contact 15.
- the respective breaker 12 can be reset.
- a reset signal is applied to the corresponding reset contact 14 and the respective output circuit 3 is controlled again as before the actuation of the switching element 10.
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- Safety Devices In Control Systems (AREA)
Description
Die vorliegende Erfindung betrifft eine Eingangsschaltung für ein Sicherheitsschaltgerät, wobei das Sicherheitsschaltgerät eine Mehrzahl Steuerkontakte und eine Mehrzahl Sicherheitskontakte für diesen nachschaltbare Ausgangskreise aufweist und die Ausgangskreise unabhängig voneinander durch an den Steuerkontakten anlegbare Schaltsignale steuerbar sind, wobei die Eingangsschaltung eine Mehrzahl Sensorkreise zum Erzeugen der Schaltsignale aufweist, und jeder Sensorkreis zur Verbindung mit einer Mehrzahl Steuerkontakte des Sicherheitsschaltgeräts ausgeführt ist. Außerdem betrifft die Erfindung eine Sicherheitsschaltung mit einer oben angegebenen Eingangsschaltung und einem Sicherheitsschaltgerät, wobei das Sicherheitsschaltgerät eine Mehrzahl Steuerkontakte und eine Mehrzahl Sicherheitskontakte für diesen nachschaltbare Ausgangskreise aufweist und die Ausgangskreise unabhängig voneinander durch an den Steuerkontakten anlegbare Schaltsignale steuerbar sind, wobei das Sicherheitsschaltgerät mit der Eingangsschaltung beschaltet ist. Weiterhin betrifft die Erfindung ein Verfahren zur Überwachung von einer Mehrzahl Sicherheitsfunktionen mit einer solchen Sicherheitsschaltung.The present invention relates to an input circuit for a safety switching device, wherein the safety switching device has a plurality of control contacts and a plurality of safety contacts for this nachschaltbare output circuits and the output circuits are independently controllable by applicable to the control contacts switching signals, the input circuit having a plurality of sensor circuits for generating the switching signals , And each sensor circuit is designed for connection to a plurality of control contacts of the safety relay. In addition, the invention relates to a safety circuit with an above-mentioned input circuit and a safety switching device, the safety switching device having a plurality of control contacts and a plurality of safety contacts for this nachschaltbare output circuits and the output circuits are independently controllable by applicable to the control contacts switching signals, wherein the safety switching device to the input circuit is connected. Furthermore, the invention relates to a method for monitoring a plurality of safety functions with such a safety circuit.
Sicherheitsschaltungen werden in Installationen von elektrischen Anlagen oder Maschinen verwendet, um verschiedene Sicherheitsfunktionen zu überwachen. Zu diesen Sicherheitsfunktionen gehören eine Notabschaltung mit einem Not-Aus-Schalter, der beispielsweise als Taster ausgeführt ist, und Tür- oder Bereichsüberwachungen mit Schutztürschaltern, Lichtschranken, Lichtgittern oder ähnlichem. Die Eingangsschaltung umfasst entsprechend verschiedene Sensorkreise für die Überwachung der Sicherheitsfunktionen. Das Sicherheitsschaltgerät erfasst von den Sensorkreisen erzeugte Schaltsignale und steuert die Ausgangskreise entsprechend. Ein solches Eingangschaltung ist aus dem
Die meisten Sicherheitsschaltgeräte sind zur Überwachung von nur wenigen Sensorkreisen ausgeführt und beispielsweise in einem 22,5 mm breiten Gehäuse bereitgestellt. Diese Bauform des Gehäuses ist weit verbreitet. Die Sicherheitsschaltgeräte verfügen entsprechend über Steuerkontakte für die Verbindung mit dem wenigstens einen Sensorkreis und Sicherheitskontakte für die Verbindung mit dem wenigstens einen Ausgangskreis. Mit derartigen Sicherheitsschaltgeräten kann die Stoppkategorie 0 und die höchste Sicherheitskategorie 4 erreicht werden.Most safety switching devices are designed to monitor only a few sensor circuits and are provided, for example, in a 22.5 mm wide housing. This type of housing is widely used. The safety switching devices accordingly have control contacts for the connection to the at least one sensor circuit and safety contacts for the connection to the at least one output circuit. With such safety switching devices, the stop category 0 and the
In kleinen bis mittelgroßen Anlagen oder Maschinen werden häufig nur wenige Sicherheitsfunktionen benötigt. Oftmals ist die Anzahl der benötigten Sicherheitsfunktionen nicht größer als 2 oder 3. Das bedeutet, dass mit aktuell verfügbaren Sicherheitsschaltgeräten der oben genannten Art zwei bis drei Sicherheitsschaltgeräte benötigt würden, um die benötigte Anzahl Sicherheitsfunktionen zu realisieren. Dies führt zu erhöhten Kosten für die Anlage oder Maschine und impliziert einen hohen Aufwand für Installation und Wartung. Außerdem wird durch die Mehrzahl Sicherheitsschaltgeräte ein großer Platzbedarf in einem Schaltschrank, in dem elektrische Komponenten der Anlagen oder Maschine installiert sind, erforderlich.In small to medium-sized plants or machines often only a few safety functions are needed. Often, the number of required safety functions is not greater than 2 or 3. This means that with currently available safety relays of the type mentioned above, two to three safety relays would be required to realize the required number of safety functions. This leads to increased costs for the plant or machine and implies a high cost of installation and maintenance. In addition, the majority of safety relays require a large amount of space in a control cabinet in which electrical components of the plant or machine are installed.
Ausgehend von diesem Stand der Technik liegt der Erfindung somit die Aufgabe zugrunde, eine Eingangsschaltung, eine Sicherheitsschaltung und ein Verfahren zur Überwachung von einer Mehrzahl Sicherheitsfunktionen mit einem Sicherheitsschaltgerät anzugeben, wobei eine Mehrzahl Sicherheitsfunktionen auf einfache Weise und kostengünstig überwacht werden kann. Insbesondere ist es Aufgabe der vorliegenden Erfindung eine Eingangsschaltung, eine Sicherheitsschaltung und ein Verfahren zur Überwachung von einer Mehrzahl Sicherheitsfunktionen anzugeben, um die Anzahl der mit einem Sicherheitsschaltgerät überwachbaren Sicherheitsfunktionen zu erhöhen.Based on this prior art, the invention is therefore the object of an input circuit, a Specify a safety circuit and a method for monitoring a plurality of safety functions with a safety switching device, wherein a plurality of safety functions can be monitored easily and inexpensively. In particular, it is an object of the present invention to provide an input circuit, a safety circuit and a method for monitoring a plurality of safety functions in order to increase the number of safety functions that can be monitored by a safety switching device.
Diese Aufgabe wird durch eine Eingangsschaltung für ein Sicherheitsschaltgerät gelöst, wobei das Sicherheitsschaltgerät eine Mehrzahl Steuerkontakte und eine Mehrzahl Sicherheitskontakte für diesen nachschaltbare Ausgangskreise aufweist und die Ausgangskreise unabhängig voneinander durch an den Steuerkontakten anlegbare Schaltsignale steuerbar sind, wobei die Eingangsschaltung eine Mehrzahl Sensorkreise zum Erzeugen der Schaltsignale aufweist, und jeder Sensorkreis zur Verbindung mit einer Mehrzahl Steuerkontakte des Sicherheitsschaltgeräts ausgeführt ist, wobei die Eingangsschaltung einen Hauptsensorkreis mit einer Mehrzahl Kanäle zur Verbindung mit jeweils zwei Steuerkontakten umfasst, wobei der Hauptsensorkreis in einer übergeordneten Ebene angeordnet und derart mit der Mehrzahl Sensorkreise verschaltet ist, dass jeweils ein Kanal des Hauptsensorkreises mit einem Sensorkreis einen gemeinsamen Steuerkontakt aufweist.This object is achieved by an input circuit for a safety switching device, wherein the safety switching device has a plurality of control contacts and a plurality of safety contacts for these nachschaltbare output circuits and the output circuits are independently controllable by applicable to the control contacts switching signals, wherein the input circuit comprises a plurality of sensor circuits for generating the switching signals and each sensor circuit is designed for connection to a plurality of control contacts of the safety switching device, wherein the input circuit comprises a main sensor circuit with a plurality of channels for connection to two control contacts, wherein the main sensor circuit is arranged in a superordinate plane and connected to the plurality of sensor circuits, that in each case a channel of the main sensor circuit having a sensor circuit has a common control contact.
Weiterhin wird die Aufgabe gelöst durch eine Sicherheitsschaltung umfassend eine oben angegebene Eingangsschaltung und ein Sicherheitsschaltgerät, wobei das Sicherheitsschaltgerät eine Mehrzahl Steuerkontakte und eine Mehrzahl Sicherheitskontakte für diesen nachschaltbare Ausgangskreise aufweist und die Ausgangskreise unabhängig voneinander durch an den Steuerkontakten anlegbare Schaltsignale steuerbar sind, wobei das Sicherheitsschaltgerät mit der Eingangsschaltung beschaltet und ausgeführt ist, jeden Ausgangskreis individuell beim Erzeugen eines Schaltsignals in einem entsprechenden Sensorkreis zu steuern, und alle Ausgangskreise gemeinsam beim Erzeugen eines Schaltsignals in dem Hauptsensorkreis zu steuern.Furthermore, the object is achieved by a safety circuit comprising an above-mentioned input circuit and a safety switching device, wherein the safety switching device has a plurality of control contacts and a plurality of safety contacts for this nachschaltbare Having output circuits and the output circuits are independently controllable by applicable to the control contacts switching signals, the safety switching device connected to the input circuit and is designed to control each output circuit individually when generating a switching signal in a corresponding sensor circuit, and all output circuits together when generating a switching signal in to control the main sensor circuit.
Außerdem wird die Aufgabe durch ein Verfahren zur Überwachung von einer Mehrzahl Sicherheitsfunktionen mit einer oben angegebenen Sicherheitsschaltung gelöst, wobei eine Sicherheitsfunktion eine übergeordnete Sicherheitsfunktion, insbesondere ein Not-Halt-Überwachung, darstellt, die übergeordnete Sicherheitsfunktion in dem Hauptsensorkreis überwacht wird, und verbleibende Sicherheitsfunktionen in den Sensorkreisen überwacht werden.In addition, the object is achieved by a method for monitoring a plurality of safety functions with a safety circuit specified above, wherein a safety function represents a higher-level safety function, in particular an emergency stop monitoring, the higher-level safety function is monitored in the main sensor circuit, and remaining safety functions in the sensor circuits are monitored.
Grundidee der vorliegenden Erfindung ist es somit, Sensorkreise und einen Hauptsensorkreis derart zu organisieren und miteinander zu verschalten, dass sich eine Mehrzahl Sicherheitsfunktionen realisieren lassen, welche die Anzahl der seitens des Sicherheitsschaltgeräts bereitgestellten Sicherheitsfunktionen übersteigt. Dazu wird eine übergeordnete Sicherheitsfunktion, beispielsweise eine Not-Aus-Überwachung mit einem Not-Aus-Taster, mit einem mehrkanaligen Hauptsensorkreis ausgeführt, wobei jeweils ein Kanal des Hauptsensorkreises mit einem der Sensorkreise erfindungsgemäß verschaltet wird. Durch die gemeinsame Nutzung eines Steuerkontaktes kann entsprechend zu jedem Sensorkreis ein Schaltsignal zum Steuern von dem Sicherheitsschaltgerät nachgeschalteten Ausgangskreisen erzeugt werden, wenn entweder der jeweilige Sensorkreis oder der übergeordnete Hauptsensorkreis das Schaltsignal erzeugen. Somit kann jeder Sensorkreis durch das Erzeugen eines Schaltsignals wie gewohnt ein Steuern wenigstens eines Ausgangskreises bewirken. Durch die hierarchische Anordnung von Hauptsensorkreis und Sensorkreisen wird sichergestellt, dass alle Sicherheitsfunktionen wirksam überwacht und alle Ausgangskreise wirksam gesteuert werden können. Schaltsignale sind bevorzugt Potentialänderungen, beispielsweise das Anlegen oder Entfernen eines Potentials. Das Steuern der Ausgangskreise umfasst ein Absteuern wie auch ein Ansteuern, und kann für eine Mehrzahl Ausgangskreise unterschiedlich ausgeführt sein. Gleichzeitig kann ein einzelnes Sicherheitsschaltgerät mit geringen Abmessungen verwendet werden, so dass kein zusätzlicher Platz in einem Schaltschrank erforderlich ist. Auch bestehende Anlagen können leicht auf diese Weise erweitert werden. Ein Kanal des Hauptsensorkreises bzw. des Sensorkreises umfasst eine Leiterschleife mit einem Schaltelement zum Unterbrechen bzw. Kurzschließen der Leiterschleife. Die Schaltelemente können beliebige im Stand der Technik bekannte Schalter sein, beispielsweise manuell zu betätigende Notausschalter, Sicherheitsschalter, die beispielsweise beim Öffnen einer Wartungsklappe der Anlage betätigt werden, Schutztürschalter oder auch elektrische Schalter, beispielsweise Magnetschalter oder Lichtschranken bzw. Lichtgitter. Die Schaltelemente können jeweils individuell als Öffner oder Schließer ausgeführt sein. Die Leiterschleife ist mit zwei Steuerkontakten des Sicherheitsschaltgeräts verbunden oder verbindbar. Das Betätigen dieses Schaltelements aktiviert eine Sicherheitsfunktion, so dass einer, mehrere oder alle Ausgangskreise gesteuert werden. Bei der mehrkanaligen Ausführung des Hauptsensorkreises sind die Schaltelemente gekoppelt und werden somit gemeinsam betätigt, beispielsweise durch einen Not-Aus-Schalter. Das Sicherheitsschaltgerät ist bevorzugt derart ausgeführt, dass es an einem der Steuerkontakte einer Leiterschleife ein Potential führt, und an dem anderen der Steuerkontakte das Potential überwacht, um ein Betätigen des jeweiligen Schaltelements zu detektieren. Bevorzugt ist der gemeinsame Steuerkontakt der potential führende Steuerkontakt, so dass die Betätigung des Schaltelements des Hauptsensorkreises oder des jeweiligen untergeordneten Sensorkreises individuell erfasst werden kann.The basic idea of the present invention is thus to organize and interconnect sensor circuits and a main sensor circuit such that a plurality of safety functions can be implemented which exceed the number of safety functions provided by the safety switching device. For this purpose, a higher-level safety function, for example an emergency stop monitoring with an emergency stop button, is executed with a multichannel main sensor circuit, wherein in each case one channel of the main sensor circuit is connected to one of the sensor circuits according to the invention. By sharing a control contact corresponding to each sensor circuit, a switching signal for controlling downstream of the safety switching device output circuits be generated when either the respective sensor circuit or the parent main sensor circuit generate the switching signal. Thus, each sensor circuit can cause control of at least one output circuit as usual by generating a switching signal. The hierarchical arrangement of the main sensor circuit and sensor circuits ensures that all safety functions can be effectively monitored and all output circuits can be effectively controlled. Switching signals are preferably potential changes, for example the application or removal of a potential. The control of the output circuits includes a drive as well as a driving, and may be performed differently for a plurality of output circuits. At the same time a single safety relay can be used with small dimensions, so that no additional space in a cabinet is required. Existing plants can easily be extended in this way. A channel of the main sensor circuit or of the sensor circuit comprises a conductor loop with a switching element for interrupting or short-circuiting the conductor loop. The switching elements may be any known in the art switches, such as manually operated emergency stop, safety switches that are operated, for example, when opening a maintenance cover of the system, safety door switch or electrical switch, such as magnetic or light barriers or light curtains. The switching elements can each be designed individually as an opener or closer. The conductor loop is connected or connectable to two control contacts of the safety relay. Actuation of this switching element activates a safety function so that one, several or all output circuits are controlled. In the multi-channel design of the main sensor circuit, the switching elements coupled and thus operated together, for example by an emergency stop switch. The safety switching device is preferably designed such that it carries a potential at one of the control contacts of a conductor loop, and monitors the potential at the other of the control contacts in order to detect an actuation of the respective switching element. Preferably, the common control contact of the potential-leading control contact, so that the operation of the switching element of the main sensor circuit or the respective subordinate sensor circuit can be detected individually.
In einer weiteren Ausführungsform der Erfindung ist vorgesehen, dass die Anzahl der Sensorkreise der Anzahl der nachschaltbaren Ausgangskreise entspricht. Dies ermöglicht eine 1:1-Zuordnung von Sensorkreisen und nachschaltbaren Ausgangskreisen, so dass jeder Ausgangskreis individuell durch einen Sensorkreis steuerbar ist.In a further embodiment of the invention, it is provided that the number of sensor circuits corresponds to the number of downstream output circuits. This allows a 1: 1 assignment of sensor circuits and nachschaltbaren output circuits, so that each output circuit is controlled individually by a sensor circuit.
In einer weiteren Ausführungsform der Erfindung ist vorgesehen, dass der Hauptsensorkreis zweikanalig ausgeführt ist und die Eingangsschaltung zwei Sensorkreise umfasst. Die resultierende Eingangsschaltung ist durch ihren einfachen Aufbau mit geringem Aufwand zu realisieren. Die entsprechende Sicherheitsschaltung kann unter Verwendung eines Sicherheitsschaltgeräts mit geringen Abmaßen ausgeführt werden, so dass sich insgesamt ein kompakter Aufbau ergibt. Somit können Sicherheitsschaltgeräte durch die Kombination mit der erfindungsgemäßen Eingangsschaltung von der Überwachung von zwei Sicherheitsfunktionen mit zwei Sensorkreisen auf die Überwachung von insgesamt drei Sicherheitsfunktionen in den zwei Sensorkreisen und dem Hauptsensorkreis erweitert werden. Damit ist die Sicherheitsschaltung besonders zur Überwachung von kleineren bis mittelgroßen Anlagen bzw. Maschinen geeignet, da die benötigen Sicherheitsfunktionen kostengünstig und mit nur geringem Aufwand realisiert werden können.In a further embodiment of the invention it is provided that the main sensor circuit is designed with two channels and the input circuit comprises two sensor circuits. The resulting input circuit can be realized with little effort by its simple structure. The corresponding safety circuit can be carried out using a safety relay with small dimensions, so that overall results in a compact design. Thus, safety switching devices can be expanded by the combination with the input circuit of the invention of the monitoring of two safety functions with two sensor circuits on the monitoring of a total of three safety functions in the two sensor circuits and the main sensor circuit. Thus, the safety circuit is especially for Monitoring of small to medium-sized plants or machines suitable because the required safety functions can be realized inexpensively and with little effort.
In einer weiteren Ausführungsform der Erfindung ist vorgesehen, dass die Mehrzahl Sensorkreise jeweils mehrkanalig ausgeführt ist, und der Hauptsensorkreis derart mit der Mehrzahl Sensorkreise verschaltet ist, dass jeweils ein Kanal des Hauptsensorkreises mit einem Kanal des Sensorkreises einen gemeinsamen Steuerkontakt aufweist. Der entsprechende Kanal des Hauptsensorkreises weist somit einen gemeinsamen Steuerkontakt mit einem der Kanäle des Sensorkreises auf. Die mehrkanalige Ausführung von Sensorkreisen ermöglicht die Überwachung von Sicherheitsfunktionen mir einer hohen Sicherheit. Üblicherweise wird in der entsprechenden Sicherheitsschaltung ein Ausgangskreis gesteuert, sobald ein Kanal des jeweiligen Sensorkreises das Schaltsignal erzeugt. Bevorzugt sind die Schaltelemente zur gemeinsamen Betätigung miteinander gekoppelt, um eine Redundanz in dem Sensorkreis zu erzielen. Die übergeordnete Überwachung der Sicherheitsfunktion durch den Hauptsensorkreis bleibt von der mehrkanaligen Ausführung der untergeordneten Sensorkreise unberührt.In a further embodiment of the invention, it is provided that the plurality of sensor circuits are each multi-channel, and the main sensor circuit is connected to the plurality of sensor circuits in such a way that in each case one channel of the main sensor circuit has a common control contact with one channel of the sensor circuit. The corresponding channel of the main sensor circuit thus has a common control contact with one of the channels of the sensor circuit. The multi-channel design of sensor circuits makes it possible to monitor safety functions with a high level of safety. Usually, an output circuit is controlled in the corresponding safety circuit as soon as a channel of the respective sensor circuit generates the switching signal. Preferably, the common actuation switching elements are coupled together to provide redundancy in the sensor circuit. The higher-level monitoring of the safety function by the main sensor circuit remains unaffected by the multichannel execution of the subordinate sensor circuits.
In einer weiteren Ausführungsform der Erfindung ist vorgesehen, dass die Mehrzahl Sensorkreise zweikanalig ausgeführt ist. Dies ist üblicherweise ausreichend, um Sicherheitsfunktionen zuverlässig zu überwachen, so dass die Eingangsschaltung und die entsprechende Sicherheitsschaltung insgesamt einen kompakten Aufbau aufweisen. In der Sicherheitsschaltung ist das Sicherheitsschaltgerät bevorzugt ausgeführt, jeden Ausgangskreis individuell beim Erzeugen eines Schaltsignals in einem Kanal des entsprechenden Sensorkreises zu steuern.In a further embodiment of the invention, it is provided that the plurality of sensor circuits is designed with two channels. This is usually sufficient to reliably monitor safety functions, so that the input circuit and the corresponding safety circuit as a whole have a compact design. In the safety circuit, the safety relay is preferably executed, each Control output circuit individually when generating a switching signal in a channel of the corresponding sensor circuit.
In einer weiteren Ausführungsform der Erfindung ist vorgesehen, dass der Hauptsensorkreis zur Not-Halt-Überwachung ausgeführt ist. Die Not-Halt-Überwachung bewirkt ein Abschalten der gesamten Anlage oder Maschine und ist daher als übergeordnete Sicherheitsfunktion zur Überwachung in dem Hauptsensorkreis besonders geeignet. Die Not-Halt-Überwachung kann durch einen entsprechenden Not-Aus-Schalter implementiert werden.In a further embodiment of the invention it is provided that the main sensor circuit is designed for emergency stop monitoring. The emergency stop monitoring causes a shutdown of the entire system or machine and is therefore particularly suitable as a higher-level safety function for monitoring in the main sensor circuit. The emergency stop monitoring can be implemented by a corresponding emergency stop switch.
In einer weiteren Ausführungsform der Erfindung ist vorgesehen, dass die Mehrzahl der Sensorkreise zur Überwachung von wenigstens einer Schutztür und/oder wenigstens einer Lichtschranke und/oder wenigstens einem Lichtgitter ausgeführt ist. Es können unterschiedliche Schaltelemente abhängig von dem jeweiligen Verwendungszweck bzw. von der jeweiligen zu überwachenden Sicherheitsfunktion verwendet werden. Die Schaltelemente können beliebig mechanisch, magnetisch oder elektrisch ausgeführt sein. Jeder Sensorkreis kann individuell mit einem unterschiedlichen Schaltelement ausgeführt sein.In a further embodiment of the invention, it is provided that the majority of the sensor circuits are designed to monitor at least one protective door and / or at least one light barrier and / or at least one light grid. Different switching elements can be used depending on the respective intended use or on the respective safety function to be monitored. The switching elements can be designed as desired mechanically, magnetically or electrically. Each sensor circuit can be designed individually with a different switching element.
In einer weiteren Ausführungsform der Erfindung ist vorgesehen, dass das Sicherheitsschaltgerät für jeden Sensorkreis eine Mehrzahl Steuerkontakte und für den jeweiligen Kanal des Hauptsensorkreises einen zusätzlichen Steuerkontakt aufweist, wobei ein Steuerkontakt des Sensorkreises mit dem jeweiligen Kanal des Hauptsensorkreises verbunden ist. Entsprechend kann die übergeordnete Sicherheitsfunktion über den Hauptsensorkreis mit nur einem zusätzlichen Steuerkontakt für jeden Sensorkreis realisiert werden. Der zusätzliche Steuerkontakt bildet zusammen mit dem Steuerkontakt, der gemeinsam mit einem Kanal des Sensorkreises verwendet wird, Verbindungspunkte für die Leiterschleife des jeweiligen Kanals des Hauptsensorkreises. Dies ermöglicht die Verwendung eines Sicherheitsschaltgeräts mit kompakten Abmessungen und ist somit für die Verwendung in kleinen Maschinen bzw. Anlagen mit kleinen Schaltschränken gut geeignet.In a further embodiment of the invention, it is provided that the safety switching device has a plurality of control contacts for each sensor circuit and an additional control contact for the respective channel of the main sensor circuit, wherein a control contact of the sensor circuit is connected to the respective channel of the main sensor circuit. Accordingly, the higher-level safety function can be implemented via the main sensor circuit with only one additional control contact for each sensor circuit. The additional Control contact together with the control contact, which is used together with a channel of the sensor circuit, connecting points for the conductor loop of the respective channel of the main sensor circuit. This allows the use of a safety relay with compact dimensions and is therefore well suited for use in small machines or systems with small control cabinets.
In einer weiteren Ausführungsform der Erfindung ist vorgesehen, dass der Steuerkontakt des Sensorkreises, der mit dem jeweiligen Kanal des Hauptsensorkreises verbunden ist, ein potentialführender Steuerkontakt ist. Der potentialführende Steuerkontakt stellt eine Spannung bereit, die bei Betätigung des jeweiligen Schaltelements ein Schaltsignal in der Form einer Potentialänderung erzeugt. Dieses Schaltsignal wird ausgehend von dem potentialführenden Steuerkontakt über die Leiterschleife des Kanals des Hauptsensorkreises oder des jeweiligen Sensorkreises an einem Steuerkontakt angelegt und von dem Sicherheitsschaltgerät erfasst. Auf diese Weise kann ermittelt werden, ob das Schaltsignal zum Steuern des entsprechenden Ausgangskreises durch den Sensorkreis oder den übergeordneten Hauptsensorkreis erzeugt wurde.In a further embodiment of the invention, it is provided that the control contact of the sensor circuit, which is connected to the respective channel of the main sensor circuit, is a potential-conducting control contact. The potential-carrying control contact provides a voltage which generates a switching signal in the form of a potential change upon actuation of the respective switching element. This switching signal is applied from the potential-carrying control contact via the conductor loop of the channel of the main sensor circuit or the respective sensor circuit to a control contact and detected by the safety relay. In this way it can be determined whether the switching signal for controlling the corresponding output circuit has been generated by the sensor circuit or the higher-order main sensor circuit.
In einer weiteren Ausführungsform der Erfindung ist vorgesehen, dass das Sicherheitsschaltgerät mit einer Mehrzahl Ausgangskreise in Übereinstimmung mit der Anzahl der Sensorkreise beschaltet wird, wobei jeder Ausgangskreis individuell durch einen Sensorkreis gesteuert wird, und alle Ausgangskreise gemeinsam durch den Hauptsensorkreis gesteuert werden. Das gemeinsame Steuern der Ausgangskreise durch den Hauptsensorkreis erlaubt das Hinzufügen einer zusätzlichen, übergeordneten Sicherheitsfunktion, wobei jeder Ausgangskreis durch einen Sensorkreis individuell steuerbar ist. Die Zuordnung von Ausgangskreisen und Sensorkreisen ist dabei prinzipiell beliebig. Das Sicherheitsschaltgerät der Sicherheitsschaltung ist entsprechend ausgeführt, um das Steuern der Ausgangskreise wie angegeben durchzuführen. Prinzipiell ist es auch möglich, dass durch einen Sensorkreis eine Mehrzahl Ausgangskreise gemeinsam gesteuert werden, wobei diese abhängigen Ausgangskreise einen unabhängigen Ausgangskreis im Sinne dieser Ausführungsform bilden.In a further embodiment of the invention it is provided that the safety switching device is connected to a plurality of output circuits in accordance with the number of sensor circuits, each output circuit being controlled individually by a sensor circuit and all output circuits being controlled jointly by the main sensor circuit. The common control of the output circuits by the main sensor circuit allows the addition of an additional, higher-level safety function, wherein Each output circuit is individually controllable by a sensor circuit. The assignment of output circuits and sensor circuits is in principle arbitrary. The safety relay of the safety circuit is designed to perform the control of the output circuits as indicated. In principle, it is also possible for a plurality of output circuits to be jointly controlled by a sensor circuit, these dependent output circuits forming an independent output circuit in the sense of this embodiment.
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
- eine schematische Darstellung von einem Hauptsensorkreis sowie untergeordneten Sensorkreisen und ihr Einwirken auf unabhängige Ausgangskreise, und
- Fig. 2
- eine erfindungsgemäße Sicherheitsschaltung mit einem Sicherheitsschaltgerät und einer erfindungsgemäßen Eingangsschaltung in schematischer Ansicht.
- Fig. 1
- a schematic representation of a main sensor circuit and subordinate sensor circuits and their action on independent output circuits, and
- Fig. 2
- a safety circuit according to the invention with a safety switching device and an input circuit according to the invention in a schematic view.
Die
Jeder Sensorkreis 2 und der Hauptsensorkreis 1 umfassen jeweils zwei Leiterschleifen 9, die je einen Kanal 9 des jeweiligen Sensorkreises 2 bzw. Hauptsensorkreises 1 bilden und mit zwei Steuerkontakten 7 des Sicherheitsschaltgeräts 6 verbunden sind. In jeder Leiterschleife 9 ist ein Schaltelement 10 angeordnet, das als Öffner ausgeführt ist, wobei die Schaltelemente 10 jedes Sensorkreises 2 bzw. des Hauptsensorkreises 1 auf nicht dargestellte Weise zur gemeinsamen Betätigung miteinander gekoppelt sind. In einer alternativen Ausführungsform ist das Schaltelement 10 als Schließer ausgeführt.Each
Jeweils einer der Steuerkontakte 7, die mit einer Leiterschleife 9 verbunden sind, ist als potentialführender Sicherheitskontakt 7 ausgeführt. Das Sicherheitsschaltgerät 6 ist weiter ausgeführt, an dem jeweils anderen Steuerkontakt 7 ein anliegendes Potential zu überprüfen. Ein Kanal 9 des Hauptsensorkreises 1 ist jeweils mit einem Kanal 9 eines Sensorkreises 2 derart verschaltet, dass sie gemeinsam mit einem potentialführenden Steuerkontakt 7 des Sicherheitsschaltgeräts 6 verbunden sind.In each case one of the
Die Sicherheitsschaltung 4 der beschriebenen Ausführungsform ist zur Überwachung von drei Sicherheitsfunktionen ausgeführt. Der Hauptsensorkreis 1 ist zur Not-Halt-Überwachung als übergeordnete Sicherheitsfunktion ausgeführt, wobei die Schaltelemente 10 des Hauptsensorkreises 1 durch einen nicht gezeigten Not-Aus-Schalter betätigt wird. Die Sensorkreise 2 sind zur Überwachung von zwei weiteren, unabhängigen Sicherheitsfunktionen ausgeführt. In diesem Ausführungsbeispiel sind die Sensorkreise 2 zur Überwachung einer Schutztür bzw. eines Lichtgitters ausgeführt. Entsprechend werden die Schaltelemente 10 des einen Sensorkreises 2 durch einen mechanischen Schalter und die Schaltelemente 10 des anderen Sensorkreises 2 elektrisch durch das Lichtgitter betätigt.The
Das Sicherheitsschaltelement 6 umfasst eine Schaltlogik 11, welche ausgehend von an den Steuerkontakten 7 angelegten Schaltsignalen zwei Unterbrecher 12 unabhängig ansteuert, um die den Sicherheitskontakten 8 nachgeschalteten Ausgangskreise 3 in Übereinstimmung mit der Darstellung in
Zusätzlich weist das Sicherheitsschaltgerät 6 zwei Versorgungskontakte 13 auf, über die das Sicherheitsschaltgerät 6 mit einer 24V-Spannung versorgt wird. Weiterhin umfasst das Sicherheitsschaltgerät 6 zwei Reset-Kontakte 14, über die das Sicherheitsschaltgerät 6 nach der Auslösung einer Sicherheitsfunktion zurückgesetzt werden kann. Dabei kann über jeden der Reset-Kontakte 14 einer der Ausgangskreise 3 individuell zurückgesetzt werden, das heißt der entsprechende Ausgangskreis 3 wird angesteuert. Auch weist das Sicherheitsschaltgerät 6 für jeden Ausgangskreis 3 einen Meldekontakt 15 auf, über den das Steuern eines Ausgangskreises 3 angezeigt wird.In addition, the
Im Weiteren wird das Verhalten der Sicherheitsschaltung 4 im Betrieb erläutert.In the following, the behavior of the
Die Sicherheitsschaltung 4 überwacht, wie in
Durch das Schaltelement 10 wird für den entsprechenden Kanal 9 das Potential des potentialführenden Steuerkontakts 7 an den jeweils anderen Steuerkontakt 7 angelegt. Dies wird als Schaltsignal von der Schaltlogik 11 erfasst. Die Schaltlogik 11 ermittelt anhand des Steuerkontakts 7, an dem das Schaltsignal anliegt, welcher Sensorkreis 2 das Schaltsignal erzeugt hat, oder ob das Schaltsignal von dem Hauptsensorkreis 1 erzeugt wurde. Entsprechend steuert die Schaltlogik 11 die Unterbrecher 12 individuell. Die Schaltlogik 11 steuert entsprechend bei der Erfassung eines Schaltsignals in einem der Kanäle 9 eines Sensorkreises 2 individuell den Unterbrecher 12 zum Steuern des diesem Sensorkreis 2 zugeordneten Ausgangskreises 3. Bei der Erkennung eines entsprechenden Schaltsignals in einem der Kanäle 9 des Hauptsensorkreises 1 steuert die Steuerlogik 11 beide Ausgangskreise 3 über die beiden Unterbrecher 12 gemeinsam ab. Durch die Unterbrecher 12 wird beim Steuern jeweils ein Meldesignal an dem entsprechenden Meldekontakt 15 angelegt.By the switching
Sofern das Schaltelement 10 zurückgesetzt ist und die für den entsprechenden Kanal 9 das Potential des potentialführenden Steuerkontakts 7 nicht mehr an dem anderen Steuerkontakt 7 angelegt, kann der jeweilige Unterbrecher 12 zurückgesetzt werden. Dazu wird ein ResetSignal an den entsprechenden Resetkontakt 14 angelegt und der jeweilige Ausgangskreis 3 erneut wie vor der Betätigung des Schaltelements 10 gesteuert.If the switching
- HauptsensorkreisMain sensor circuit
- 11
- Sensorkreissensor circuit
- 22
- Ausgangskreisoutput circuit
- 33
- Sicherheitsschaltungsafety circuit
- 44
- Eingangsschaltunginput circuit
- 55
- SicherheitsschaltgerätSafety relay
- 66
- Steuerkontaktcontrol contact
- 77
- Sicherheitskontaktsafety contact
- 88th
- Leiterschleife, KanalConductor loop, channel
- 99
- Schaltelement, ÖffnerSwitching element, NC contact
- 1010
- Schaltlogikswitching logic
- 1111
- Unterbrecherbreaker
- 1212
- Versorgungskontaktesupply contacts
- 1313
- Reset-KontaktReset connector
- 1414
- Meldekontaktsignaling contact
- 1515
- SicherheitskreisSafety circuit
- 1616
- HauptsicherheitskreisMain safety circuit
- 1717
Claims (13)
- An input circuit (5) for a safety switching device (6), wherein the safety switching device (6) has a plurality of control contacts (7) and a plurality of safety contacts (8) for output circuits (3) that can be connected downstream, and the output circuits (3) can be controlled independently of one another by switching signals that can be applied to the control contacts (7), wherein
the input circuit (5) has a plurality of sensor circuits (2) for generating switching signals, and
each sensor circuit (2) is configured for connection to a plurality of control contacts (7) of the safety switching device (6),
characterised in that
the input circuit (5) comprises a primary sensor circuit (1) having a plurality of channels (9) for connection in each case to two control contacts (7), wherein
the primary sensor circuit (1) is arranged in a superordinate plane and is connected to the plurality of sensor circuits (2) in such a way that each channel (9) of the primary sensor circuit (1) has a common control contact (7) with a sensor circuit (2). - The input circuit (5) according to Claim 1, characterised in that
the number of sensor circuits (2) corresponds to the number of output circuits (3) that can be connected downstream. - The input circuit (5) according to one of Claims 1 or 2, characterised in that
the primary sensor circuit (1) is formed with two channels and the input circuit (5) comprises two sensor circuits (2). - The input circuit (5) according to one of the preceding claims, characterised in that
the plurality of sensor circuits (2) is formed in each case with a number of channels, and
the primary sensor circuit (1) is connected to the plurality of sensor circuits (2) in such a way that each channel (9) of the primary sensor circuit (1) has a common control contact (7) with a channel (9) of the sensor circuit (2). - The input circuit (5) according to Claim 4, characterised in that
the plurality of sensor circuits (3) is formed in two channels. - The input circuit (5) according to one of the preceding claims, characterised in that
the primary sensor circuit (1) is configured for emergency stop monitoring. - The input circuit (5) according to one of the preceding claims, characterised in that
the plurality of sensor circuits (2) is configured to monitor at least one safety door and/or at least one light barrier and/or at least one light grid. - A safety circuit (4) comprising
an input circuit (5) according to one of Claims 1 to 7 and
a safety switching device (6), wherein the safety switching device (6) has a plurality of control contacts (7) and a plurality of safety contacts (8) for output circuits (3) that can be connected downstream and the output circuits (3) can be controlled independently of one another by switching signals that can be applied to the control contacts (7), wherein
the safety switching device (6) is connected to the input circuit (5) and is configured to control each output circuit (3) individually when generating a switching signal in a corresponding sensor circuit (2), and
to control all output circuits (3) jointly when generating a switching signal in the primary sensor circuit (1). - The safety circuit (4) according to Claim 8, characterised in that
the safety switching device (6) for each sensor circuit (2) has a plurality of control contacts (7) and for the respective channel (9) of the primary sensor circuit (1) has an additional control contact (7), wherein a control contact (7) of the sensor circuit (2) is connected to the respective channel (9) of the primary sensor circuit (1). - The safety circuit (4) according to Claim 9, characterised in that
the control contact (7) of the sensor circuit (2), which is connected to the respective channel (9) of the primary sensor circuit (1), is a potential-carrying control contact (7). - The safety circuit (4) according to one of Claims 8 to 10, characterised in that
the sensor circuits (2) are formed with two channels, and
the safety switching device (6) is configured to control each output circuit (3) individually when generating a switching signal in a channel (9) of the corresponding sensor circuit (2). - A method for monitoring a plurality of safety functions with a safety circuit (4) according to one of Claims 8 to 11, wherein
a safety function constitutes a superordinate safety function, in particular an emergency stop monitoring,
the superordinate safety function is monitored in the primary sensor circuit (1) and
remaining safety functions are monitored in the sensor circuits (2). - The method according to Claim 12, characterised in that
the safety switching device (6) is connected to a plurality of output circuits (3) in conformity with the number of sensor circuits, wherein
each output circuit (3) is controlled individually by a sensor circuit (2), and
all output circuits (3) are controlled jointly by the primary sensor circuit (1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011055560 | 2011-11-21 | ||
| DE201110056594 DE102011056594A1 (en) | 2011-11-21 | 2011-12-19 | Input circuit for a safety switching device, safety circuit with a safety switching device and such an input circuit, and method for monitoring a plurality of safety functions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2595010A1 EP2595010A1 (en) | 2013-05-22 |
| EP2595010B1 true EP2595010B1 (en) | 2015-03-18 |
Family
ID=47227632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20120193482 Active EP2595010B1 (en) | 2011-11-21 | 2012-11-20 | Input circuit for a safety switching device, safety circuit with a safety switching device and such an input circuit, and method for monitoring a number of safety functions |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2595010B1 (en) |
| DE (1) | DE102011056594A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4804515A (en) * | 1984-10-31 | 1989-02-14 | Westinghouse Electric Corp. | Distributed microprocessor based sensor signal processing system for a complex process |
| EP0274639B1 (en) * | 1986-12-12 | 1993-08-04 | Siemens Aktiengesellschaft | Protective interrupting system |
| US5583757A (en) * | 1992-08-04 | 1996-12-10 | The Dow Chemical Company | Method of input signal resolution for actively redundant process control computers |
| US6909923B2 (en) * | 1999-12-22 | 2005-06-21 | Rockwell Automation Technologies, Inc. | Safety communication on a single backplane |
| DE10011211B4 (en) * | 2000-03-08 | 2004-08-05 | Pilz Gmbh & Co. | Safety relay and safety relay system |
| DE102004020830B4 (en) * | 2004-02-19 | 2010-06-10 | Lenze Automation Gmbh | Safety circuit grouping with ring concept for control units of power electronics |
| DE502007001646D1 (en) * | 2007-08-16 | 2009-11-12 | Festo Ag & Co Kg | Modular arrangement with lined-up in a row direction modules, which are at least partially formed as valve modules |
-
2011
- 2011-12-19 DE DE201110056594 patent/DE102011056594A1/en not_active Withdrawn
-
2012
- 2012-11-20 EP EP20120193482 patent/EP2595010B1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP2595010A1 (en) | 2013-05-22 |
| DE102011056594A1 (en) | 2013-05-23 |
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