EP1259969B1 - Safety switch device with a first and a second input circuit breaker - Google Patents

Safety switch device with a first and a second input circuit breaker Download PDF

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Publication number
EP1259969B1
EP1259969B1 EP01905781A EP01905781A EP1259969B1 EP 1259969 B1 EP1259969 B1 EP 1259969B1 EP 01905781 A EP01905781 A EP 01905781A EP 01905781 A EP01905781 A EP 01905781A EP 1259969 B1 EP1259969 B1 EP 1259969B1
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EP
European Patent Office
Prior art keywords
input
switch
safety switching
input switch
contacts
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Expired - Lifetime
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EP01905781A
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German (de)
French (fr)
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EP1259969A1 (en
Inventor
Gerhard Ehrlich
Boris Kaufmann
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Pilz GmbH and Co KG
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Pilz GmbH and Co KG
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Publication of EP1259969A1 publication Critical patent/EP1259969A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/001—Thumb wheel switches
    • 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
    • H01H47/004—Monitoring or fail-safe circuits using plural redundant serial connected relay operated contacts in controlled circuit

Definitions

  • the present invention relates to a safety switching device for safely stopping a machine system from who runs a risk with a first and a second Input switches, their respective switching positions simultaneously and redundantly define a manipulated variable on the input side, with at least one output switching element that is in an output circuit the safety switching device is arranged, and with an evaluation and control unit that depends on the defined manipulated variable, the at least one output switching element controls, the evaluation and control unit two channels is formed, wherein a first channel with the first input switch and a second channel with the second input switch is connected, and wherein switching contacts of the first and of the second input switch with regard to their switching position are coupled to one another via a common actuator.
  • Such a safety switching device is from the applicant of the present invention under the type designation PNOZ XV2 distributed.
  • Safety switching devices in the sense of the present Invention belong to both independent safety relays as well as complex safety controls, for example on the basis of a safe PLC control.
  • Such devices are mainly used in the industrial area to switch operations to perform in a safe manner.
  • "Safe" means in this context that the device at least meets category 3 of the European standard EN 954-1.
  • such devices are used to in Reaction to the actuation of an emergency stop button or opening a protective door a machine system from which there is a danger going out, stopping or otherwise in a safe Convict state. Because device failure in one such situation is an immediate threat to people or also results in material values are considered the fail safety of safety switching devices very much high demands made. This leads to a lot of effort combined with high development and manufacturing costs of safety switching devices.
  • the input side Manipulated variable is a time constant that is a delay time determined when switching off. Such a delay time is required, for example, to switch off a Machine system controls movable drives in one to be able to move to a safe resting position.
  • the time constant is in the known safety switching device with the help set by two mutually redundant rotary switches that arranged one below the other or one behind the other on a common shaft are. This structure is described in more detail below with reference to FIG. 2 explained.
  • the manipulated variable to be set can be used by everyone a safety switching device relevant input parameters his.
  • the known safety switching device fulfills the safety requirements Requirements of the standard EN 954-1 in particular this is because the two input switches are separate from each other define the desired time constant. Due to the Resulting redundancy can be a fault on one of the switches reliably recognized by the evaluation and control unit become.
  • the disadvantage is that the production of the known Safety switching device a high mechanical effort requires what is associated with correspondingly high costs.
  • the structure of the known safety switching device is required comparatively much space, what a miniaturization generic devices prevented or at least difficult.
  • Switch units known for many years in which by the actuation of an actuator perform two switching functions to let.
  • a corresponding switch unit is, for example described in DE 25 45 719 A1.
  • This task is performed in the safety switching device mentioned at the beginning solved in that the switching contacts of the first and second input switch spatially on one level are arranged and that the actuator is a common circular support member includes on which the switching contacts of the first and second input switch arranged radially offset from each other are.
  • the switch contacts of the two are Input switch in the known safety switching device in two parallel planes. This has to Consequence that the two input switches in two separate Steps in the housing of the safety switching device must be installed.
  • the two Input switch in the safety switching device according to the invention can be assembled in a single step. This simplifies assembly and the invention Safety switching device can be produced more cheaply become.
  • the actuator contains a common one Carrier element on which the switching contacts of the first and second Input switch arranged spatially offset from each other are.
  • This measure has the advantage that the switch contacts two input switches on structurally very simple and therefore inexpensive way are coupled. On couplings, Gearbox or other measures to transmit a shift movement from the first input switch to the second therefore be dispensed with without the risk of different Operator setting exists.
  • this is common carrier element adjustable in rotation.
  • the common carrier element may be translationally adjustable.
  • design has an advantage above all if the two input switches multi-position switch are, since the existing switching contacts save space to each other and can thus be arranged in a more compact manner.
  • the common carrier element is a carrier disc on which the switching contacts of the first and second input switches are arranged radially offset from one another.
  • the two can be separated Input switch particularly small and space saving in be integrated into a common mechanical structure. moreover This also simplifies the assembly of the input switches in the housing of the safety switching device according to the invention.
  • This measure has the advantage that the separate Input switch a common, redundant in itself Form component that is very simple and therefore inexpensive Way in the safety switching device according to the invention can be assembled. It also failsafe increased even further because of the risk of damage the redundant switch arrangement during assembly or at a later intervention in the safety switching device is reduced is. In addition, the safety-relevant switch arrangement in this way particularly good against external environmental influences, such as pollution. This also contributes to increasing error security.
  • the switch contacts of the first and second input switch sliding contacts, with the help of the actuator via fixed contact surfaces are movable.
  • the two input switches are on fail-safe Way even in very large numbers produce what minimizes the cost of the two input switches.
  • the error measure further increases the reliability, since conductor track structures in the operation of the device are not subject to any wear or at most extremely little wear, so that a subsequent operation of the device occurring errors is largely excluded. Likewise the risk of subsequent cross-circuits or short-circuits reduced.
  • the first and second input switches each multi-position switch.
  • the first and second input switches on the input side and output side Connection contacts, each in a matrix structure to each other are arranged.
  • This measure has the advantage that the number of required Connection contacts for the two input switches reduced can be, which is also a reduction in the required Space allows. It also simplifies thereby the assembly.
  • This measure reduces the number of connections required reduced again for the two input switches. So this measure makes it possible, for example, to 16 each other redundant switch positions, i.e. a total of 32 switch positions, with only a total of 12 connection contacts. As a result, the space of the invention Arrangement reduced again and the assembly can be simplified.
  • FIG. 1 is a safety switching device according to the invention in the form of a safety switching device in its entirety designated with the reference number 10.
  • the safety switching device 10 has two mutually redundant ones Input switches 12 and 14 with regard to their switching position about a common, shown only schematically here Actuator 16 are coupled together.
  • the input switches 12, 14 are in an identical manner in one Integrated voltage divider, each consisting of a resistor 18a, 18b and a resistance group 20a, 20b.
  • the resistance groups 20a, 20b include here Embodiment three arranged parallel to each other Resistors with different resistance values.
  • On the both voltage dividers is an operating voltage, which in present embodiment is 24 V.
  • the two voltage dividers generate depending on the respective switching position the input switch 12, 14 an output signal that a timer in each case via a further resistor 22a, 22b 24a, 24b is supplied.
  • timers 24a, 24b redundant to each other and depending on the respectively received Voltage is a time constant that of an evaluation and Control unit 26 is supplied. The tension obtained depends thereby from the respective switching position of the two input switches 12, 14 from.
  • the evaluation and control unit 26 is in the present exemplary embodiment trained in two channels and points in each channel a microcontroller 28a, 28b.
  • the microcontrollers 28a, 28b also evaluate others not shown here Input signals from, for example, an emergency stop button or a protective door can be generated. Dependent on of these input signals as well as the redundantly defined to each other
  • the microcontrollers 28a, 28b control time constants output switch contacts 30a, 30b, respectively.
  • the output switch contacts 30a, 30b are in series with each other in a power supply path a machine system 32 is arranged.
  • Relay contacts 30a, 30b can also semiconductor elements can be used as output switching elements.
  • the entire safety switching device 10 is in a housing 34 housed, the terminals in a conventional manner 36 for connecting the power supply and the machine system 32 has.
  • Fig. 2 is a generic safety switching device, such as sold by the assignee of the present invention is designated in its entirety by the reference number 40.
  • the housing 34 of the safety switching device 40 leaves in the present Cross-sectional representation of a front 42 and two Recognize side walls 44, 46. Are inside the housing 34 along the two side walls 44, 46 each component carrier arranged in the form of so-called boards 48, 50. exemplary are 48 individual components with the reference numerals on the board Denoted 52 and 54. It is also exemplary on the board 50 the comparatively large housing of a relay 56 shown that the output switch contacts 30a, 30b includes.
  • the reference numbers 58 and 60 denote two further boards, the parallel to the front 42 and parallel to each other are fixed between the boards 48 and 50.
  • Next further components 52, 54 are located on these two Circuit boards the input switches 12 and 14. These are here about rotary switches, one below the other or one behind the other common shaft 62 are attached.
  • the shaft 62 occurs on the Front 42 of the housing 34 to the outside and is there with a Knob 64 connected.
  • the shaft 62 thus forms a common one Actuator for the two input switches 12 and 14 are the switching contacts of the two input switches 12 and 14, as can be seen from the illustration in FIG. 2, in different arranged parallel to each other planes 66, 68.
  • the invention differs Safety switching device 10 from the known safety switching device 40 among other things by the fact that on the two Boards 58, 60 arranged parallel to the front side 42 are dispensed with can be. Instead, the two input switches are located 12 and 14 in this exemplary embodiment in one common input switch unit 70, the structure of which follows is explained in more detail with reference to FIGS. 4 and 5.
  • the input switch unit 70 is via pins 72 to the board 48 connected.
  • this arrangement is only one possible Embodiment reflected.
  • the input switch unit 70 also arranged parallel to the front side 42 Board 58 may be contacted.
  • Safety switching device 40 is such a circuit board 58 as well as a second circuit board 60 arranged parallel thereto, however not necessarily required.
  • the input switch unit 70 has a switch housing 74 in which the mechanical actuating parts are accommodated.
  • the switch housing 74 is open a circuit board 76.
  • the board 76 has on that Switch housing 74 side facing several along circular paths running conductor tracks 78, 80, 82, 84.
  • Each of the Conductor tracks 78 to 84 each have a contact pin 72 connected, the connections for the conductor tracks 82 and 84 in the present embodiment on the back the board 76 are executed, which is indicated by the dotted line is shown.
  • a circular support disc 86 arranged in the direction of arrow 88 is rotatable.
  • the actuation of the carrier disk 86 is optionally carried out by one of two buttons 90, 92, each tangential and parallel to each other along two side walls of the switch housing 74 are arranged.
  • On the board 76 facing away from the carrier disc 86 one star-shaped structure 94, in the cams 96, 98 of the two Push buttons 90, 92 can intervene.
  • the buttons 90, 92 with springs 100, 102 are against supported the rear wall of the switch housing 74.
  • the actuation one of the two buttons 90, 92 has the consequence that the Carrier disc 86 around one tooth of the star-shaped structure 94 is rotated in the direction of arrow 88.
  • the radial are staggered.
  • the pair of sliding contacts 104 interacts with conductor tracks 78 and 80, while the sliding contact pair 106 with the conductor tracks 82 and 84 cooperates.
  • the sliding contact pair 104 is located in an angular range above the diagonal 108 according to FIG. 5, it establishes a conductive connection between the otherwise galvanically isolated interconnects 78 and 80 ago. In this The case is the input switch 12 between the contact pins 72 and 73 closed.
  • the sliding contact pair 104 is in one Angular position that is below the diagonal 108 according to FIG. 5 there is no conductive connection between the conductor tracks 78 and 80 so that the switch between the contact pins 72 and 73 is open.
  • the conductor tracks 78 to 84 are in this way to one another on the circuit board 76 arranged that the input switch realized thereby 12 and 14 each simultaneously and redundantly to each other turn.
  • the switching logic is easy to understand the input switch unit 70 mainly from the arrangement of Conductor tracks 78 to 84 on the circuit board 76.
  • the present exemplary embodiment is aware of the invention simply chosen. However, it is understood that by an appropriate Choice of trace structure also redundant multi-position switches are realizable.
  • the input switch unit 70 is a particularly preferred one Embodiment for a safety switching device according to the invention 10.
  • the Slip contact pairs 104, 106 and the conductor track structures 78 up to 84 i.e. all switching contacts of the two input switches 12 and 14, thereby within a common level 110.
  • the use of a two-button switch of the type shown is not essential for the implementation of the invention required.
  • the carrier disk 86 can also be used, for example a shaft 62 and a knob 64 can be adjusted, such as this is known from the safety switching device 40.
  • Desired switching positions would be 64 contact pins per se or appropriate connection options required. This number can be suitably encoded Reduce switching positions using a matrix structure.
  • FIG. 6 shows a preferred exemplary embodiment of a matrix structure 120 for the input switches 12 and 14.
  • the matrix structure 120 has four connection contacts 122, the parallel switch contacts 124, 126 of the two input switches 12 and 14 are supplied.
  • the mutually assigned switching contacts 124, 126 are the mutually assigned switching contacts 124, 126 by shifted one step towards each other, i.e. it is here 6 top switching contact 124 of the input switch 12 with the second uppermost switch contact 126 of the input switch in FIG. 6 14 connected.
  • the Switch contacts 124, 126 of the two input switches 12 and 14 but also linked by other increments become.
  • the output-side switching contacts 132, 134 of the two input switches 12 and 14 are separated from one another on the output side Connection contacts 136, 138 performed. Because of the matrix arrangement can be compared or evaluated of the signals at the input contacts 122 and the current-side connection contacts 136, 138 Determine the switching position of the input switches 12 and 14.
  • the matrix structure 120 shown here is due to the common input-side connection contacts 122 and the separate output-side connection contacts 132, 134 a fail-safe Evaluation with a minimum number of connection contacts possible.

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Abstract

Two switches (12,14) are operated in common by control devices, e.g. an emergency push button. These in turn control timer devices (24a,24b) the time being set according to which switch contact is closed. The timers initiate controllers (28a,28b) which trip power supply switches (30a,30b). All are housed in a common cabinet (36) with the switches arranged in one plane

Description

Die vorliegende Erfindung betrifft eine Sicherheitsschaltvorrichtung zum sicheren Stillsetzen einer Maschinenanlage, von der eine Gefahr ausgeht, mit einem ersten und einem zweiten Eingangsschalter, deren jeweilige Schaltstellungen zeitgleich und redundant zueinander eine eingangsseitige Stellgröße definieren, mit zumindest einem Ausgangsschaltelement, das in einem Ausgangskreis der Sicherheitsschaltvorrichtung angeordnet ist, und mit einer Auswerte- und Steuereinheit, die in Abhängigkeit von der definierten Stellgröße das zumindest eine Ausgangsschaltelement ansteuert, wobei die Auswerte- und Steuereinheit zweikanalig ausgebildet ist, wobei ein erster Kanal mit dem ersten Eingangsschalter und ein zweiter Kanal mit dem zweiten Eingangsschalter verbunden ist, und wobei Schaltkontakte des ersten und des zweiten Eingangsschalters hinsichtlich ihrer Schaltstellung über ein gemeinsames Stellglied miteinander verkoppelt sind. The present invention relates to a safety switching device for safely stopping a machine system from who runs a risk with a first and a second Input switches, their respective switching positions simultaneously and redundantly define a manipulated variable on the input side, with at least one output switching element that is in an output circuit the safety switching device is arranged, and with an evaluation and control unit that depends on the defined manipulated variable, the at least one output switching element controls, the evaluation and control unit two channels is formed, wherein a first channel with the first input switch and a second channel with the second input switch is connected, and wherein switching contacts of the first and of the second input switch with regard to their switching position are coupled to one another via a common actuator.

Eine derartige Sicherheitsschaltvorrichtung wird von der Anmelderin der vorliegenden Erfindung unter der Typenbezeichnung PNOZ XV2 vertrieben.Such a safety switching device is from the applicant of the present invention under the type designation PNOZ XV2 distributed.

Zu den Sicherheitsschaltvorrichtungen im Sinne der vorliegenden Erfindung gehören sowohl eigenständige Sicherheitsschaltgeräte als auch komplexe Sicherheitssteuerungen, beispielsweise auf der Basis einer sicheren SPS-Steuerung. Derartige Vorrichtungen werden vor allem im industriellen Bereich verwendet, um Schaltvorgänge auf sichere Art und Weise durchzuführen. "Sicher" bedeutet dabei in diesem Zusammenhang, daß die Vorrichtung zumindest die Kategorie 3 der europäischen Norm EN 954-1 erfüllt. Beispielsweise werden derartige Vorrichtungen verwendet, um in Reaktion auf die Betätigung eines Not-Aus-Tasters oder das Öffnen einer Schutztür eine Maschinenanlage, von der eine Gefahr ausgeht, stillzusetzen oder anderweitig in einen gefahrlosen Zustand zu überführen. Da ein Versagen der Vorrichtung in einer solchen Situation eine unmittelbare Gefährdung für Menschen oder auch materielle Werte zur Folge hat, werden hinsichtlich der Fehlersicherheit von Sicherheitsschaltvorrichtungen sehr hohe Anforderungen gestellt. Dies führt zu einem hohen Aufwand verbunden mit hohen Kosten bei der Entwicklung und Fertigung von Sicherheitsschaltvorrichtungen.To the safety switching devices in the sense of the present Invention belong to both independent safety relays as well as complex safety controls, for example on the basis of a safe PLC control. Such devices are mainly used in the industrial area to switch operations to perform in a safe manner. "Safe" means in this context that the device at least meets category 3 of the European standard EN 954-1. For example, such devices are used to in Reaction to the actuation of an emergency stop button or opening a protective door a machine system from which there is a danger going out, stopping or otherwise in a safe Convict state. Because device failure in one such situation is an immediate threat to people or also results in material values are considered the fail safety of safety switching devices very much high demands made. This leads to a lot of effort combined with high development and manufacturing costs of safety switching devices.

Bei der bekannten Sicherheitsschaltvorrichtung ist die eingangsseitige Stellgröße eine Zeitkonstante, die eine Verzögerungszeit beim Abschalten bestimmt. Eine derartige Verzögerungszeit wird beispielsweise benötigt, um beim Abschalten einer Maschinenanlage bewegliche Antriebe kontrolliert in eine sichere Ruheposition verfahren zu können. Die Zeitkonstante wird bei der bekannten Sicherheitsschaltvorrichtung mit Hilfe von zwei zueinander redundanten Drehschaltern eingestellt, die unter- bzw. hintereinander auf einer gemeinsamen Welle angeordnet sind. Dieser Aufbau ist weiter unten anhand Fig. 2 näher erläutert.In the known safety switching device is the input side Manipulated variable is a time constant that is a delay time determined when switching off. Such a delay time is required, for example, to switch off a Machine system controls movable drives in one to be able to move to a safe resting position. The time constant is in the known safety switching device with the help set by two mutually redundant rotary switches that arranged one below the other or one behind the other on a common shaft are. This structure is described in more detail below with reference to FIG. 2 explained.

Generell kann die einzustellende Stellgröße jedoch jeder für eine Sicherheitsschaltvorrichtung relevante Eingangsparameter sein.In general, however, the manipulated variable to be set can be used by everyone a safety switching device relevant input parameters his.

Die bekannte Sicherheitsschaltvorrichtung erfüllt die sicherheitstechnischen Anforderungen der Norm EN 954-1 insbesondere deshalb, weil die beiden Eingangsschalter getrennt voneinander jeweils die gewünschte Zeitkonstante definieren. Aufgrund der sich ergebenden Redundanz kann ein Fehler bei einem der Schalter von der Auswerte- und Steuereinheit zuverlässig erkannt werden. Nachteilig ist jedoch, daß die Fertigung der bekannten Sicherheitsschaltvorrichtung einen hohen mechanischen Aufwand erfordert, was mit entsprechend hohen Kosten verbunden ist. Darüber hinaus benötigt der Aufbau der bekannten Sicherheitsschaltvorrichtung vergleichsweise viel Platz, was eine Miniaturisierung gattungsgemäßer Vorrichtungen verhindert oder zumindest erschwert.The known safety switching device fulfills the safety requirements Requirements of the standard EN 954-1 in particular this is because the two input switches are separate from each other define the desired time constant. Due to the Resulting redundancy can be a fault on one of the switches reliably recognized by the evaluation and control unit become. The disadvantage, however, is that the production of the known Safety switching device a high mechanical effort requires what is associated with correspondingly high costs. In addition, the structure of the known safety switching device is required comparatively much space, what a miniaturization generic devices prevented or at least difficult.

Außerhalb des Bereichs der Sicherheitstechnik sind bereits seit vielen Jahren Schaltereinheiten bekannt, bei denen sich durch die Betätigung eines Stellelements zwei Schaltfunktionen ausführen lassen. Eine entsprechende Schaltereinheit ist beispielsweise in der DE 25 45 719 A1 beschrieben. Outside of the field of security technology have been around since Switch units known for many years, in which by the actuation of an actuator perform two switching functions to let. A corresponding switch unit is, for example described in DE 25 45 719 A1.

Es ist daher eine Aufgabe der vorliegenden Erfindung, eine Sicherheitsschaltvorrichtung der eingangs genannten Art anzugeben, die bei gleichbleibend hohen Sicherheitsanforderungen kostengünstiger und raumsparender aufgebaut ist.It is therefore an object of the present invention to provide a safety switching device of the type mentioned at the beginning, which are more cost-effective with consistently high security requirements and is space-saving.

Diese Aufgabe wird bei der eingangs genannten Sicherheitsschaltvorrichtung dadurch gelöst, daß die Schaltkontakte des ersten und zweiten Eingangsschalters räumlich in einer Ebene angeordnet sind und daß das Stellglied ein gemeinsames Kreisförmiges Trägerelement beinhaltet, auf dem die Schaltkontakte des ersten und zweiten Eingangsschalters radial versetzt zueinander angeordnet sind.This task is performed in the safety switching device mentioned at the beginning solved in that the switching contacts of the first and second input switch spatially on one level are arranged and that the actuator is a common circular support member includes on which the switching contacts of the first and second input switch arranged radially offset from each other are.

Im Unterschied dazu befinden sich die Schaltkontakte der beiden Eingangsschalter bei der bekannten Sicherheitsschaltvorrichtung in zwei parallel zueinander versetzten Ebenen. Dies hat zur Folge, daß die beiden Eingangsschalter in zwei getrennten Arbeitsschritten in dem Gehäuse der Sicherheitsschaltvorrichtung montiert werden müssen. Demgegenüber können die beiden Eingangsschalter bei der erfindungsgemäßen Sicherheitsschaltvorrichtung in einem einzigen Arbeitsschritt montiert werden. Hierdurch vereinfacht sich die Montage, und die erfindungsgemäße Sicherheitsschaltvorrichtung kann kostengünstiger produziert werden.In contrast, the switch contacts of the two are Input switch in the known safety switching device in two parallel planes. This has to Consequence that the two input switches in two separate Steps in the housing of the safety switching device must be installed. In contrast, the two Input switch in the safety switching device according to the invention can be assembled in a single step. This simplifies assembly and the invention Safety switching device can be produced more cheaply become.

Darüber hinaus kann, wie nachfolgend anhand bevorzugter Ausgestaltungen der Erfindung gezeigt wird, der erforderliche Bauraum für die beiden Eingangsschalter beträchtlich verkleinert werden, so daß die erfindungsgemäße Sicherheitsschaltvorrichtung insgesamt kleinbauender realisiert werden kann. Bei alledem ist es jedoch trotzdem möglich, voneinander getrennte und damit zueinander redundante Eingangsschalter zu verwenden. Die geforderte Fehlersicherheit bleibt somit vollständig erhalten.In addition, as follows based on preferred configurations the invention is shown, the space required considerably reduced for the two input switches be so that the safety switching device according to the invention can be realized overall smaller. With all of this however, it is still possible to separate and to use redundant input switches. The The required level of error security is therefore fully retained.

Erfindungsgemäß beinhaltet das Stellglied ein gemeinsames Trägerelement, auf dem die Schaltkontakte des ersten und zweiten Eingangsschalters räumlich versetzt zueinander angeordnet sind.According to the invention, the actuator contains a common one Carrier element on which the switching contacts of the first and second Input switch arranged spatially offset from each other are.

Diese Maßnahme besitzt den Vorteil, daß die Schaltkontakte der beiden Eingangsschalter auf konstruktiv sehr einfache und damit kostengünstige Art und Weise gekoppelt sind. Auf Kupplungen, Getriebe oder andere Maßnahmen zur Übertragung einer Schaltbewegung von dem ersten Eingangsschalter auf den zweiten kann daher verzichtet werden, ohne daß die Gefahr von unterschiedlichen Bedienereinstellung besteht.This measure has the advantage that the switch contacts two input switches on structurally very simple and therefore inexpensive way are coupled. On couplings, Gearbox or other measures to transmit a shift movement from the first input switch to the second therefore be dispensed with without the risk of different Operator setting exists.

Die genannte Aufgabe ist daher vollständig gelöst.The stated task is therefore completely solved.

In einer Ausgestaltung der zuvor genannten Maßnahme ist das gemeinsame Trägerelement rotatorisch verstellbar.In one embodiment of the measure mentioned above, this is common carrier element adjustable in rotation.

Alternstiv hierzu ist es auch denkbar, des gemeinsame Trägerelement translatorisch verstellbar zu gestalten. Die bevorzugte Ausgestaltung besitzt demgegenüber vor allem dann einen Vorteil, wenn die beiden Eingangsschalter Mehrstellungsschalter sind, da die vorhandenen Schaltkontakte so raumsparender zueinander und damit kleinbauender angeordnet werden können. Alternatively, it is also conceivable for the common carrier element to be translationally adjustable. The preferred In contrast, design has an advantage above all if the two input switches multi-position switch are, since the existing switching contacts save space to each other and can thus be arranged in a more compact manner.

In einer weiteren Ausgestaltung der zuvor genannten Maßnahmen ist das gemeinsame Trägerelement eine Trägerscheibe, auf der die Schaltkontakte des ersten und zweiten Eingangsschalters radial versetzt zueinander angeordnet sind.In a further embodiment of the measures mentioned above the common carrier element is a carrier disc on which the switching contacts of the first and second input switches are arranged radially offset from one another.

Aufgrund dieser Maßnahme können die beiden voneinander getrennten Eingangsschalter besonders kleinbauend und raumsparend in einem gemeinsamen mechanischen Aufbau integriert werden. Zudem vereinfacht sich hierdurch auch die Montage der Eingangsschalter in dem Gehäuse der erfindungsgemäßen Sicherheitsschaltvorrichtung. Because of this measure, the two can be separated Input switch particularly small and space saving in be integrated into a common mechanical structure. moreover This also simplifies the assembly of the input switches in the housing of the safety switching device according to the invention.

In einer weiteren Ausgestaltung der Erfindung sind der erste und zweite Eingangsschalter sowie das gemeinsame Stellglied von einem gemeinsamen Schaltergehäuse umhäust.In a further embodiment of the invention, the first and second input switch and the common actuator of housed a common switch housing.

Diese Maßnahme besitzt den Vorteil, daß die voneinander getrennten Eingangsschalter ein gemeinsames, in sich redundantes Bauelement bilden, das auf sehr einfache und damit kostengünstige Weise in der erfindungsgemäßen Sicherheitsschaltvorrichtung montiert werden kann. Darüber hinaus wird die Fehlersicherheit noch weiter gesteigert, da die Gefahr einer Beschädigung der redundanten Schalteranordnung bei der Montage oder bei einem späteren Eingriff in die Sicherheitsschaltvorrichtung reduziert ist. Zudem ist die sicherheitsrelevante Schalteranordnung auf diese Weise besonders gut gegenüber äußeren Umwelteinflüssen, wie beispielsweise Verschmutzung, geschützt. Auch dies trägt zur Erhöhung der Fehlersicherheit bei.This measure has the advantage that the separate Input switch a common, redundant in itself Form component that is very simple and therefore inexpensive Way in the safety switching device according to the invention can be assembled. It also failsafe increased even further because of the risk of damage the redundant switch arrangement during assembly or at a later intervention in the safety switching device is reduced is. In addition, the safety-relevant switch arrangement in this way particularly good against external environmental influences, such as pollution. This also contributes to increasing error security.

In einer weiteren Ausgestaltung der Erfindung sind die Schaltkontakte des ersten und zweiten Eingangsschalters Schleifkontakte, die mit Hilfe des Stellgliedes über feststehende Kontaktflächen bewegbar sind.In a further embodiment of the invention, the switch contacts of the first and second input switch sliding contacts, with the help of the actuator via fixed contact surfaces are movable.

Diese Maßnahme ermöglicht einen besonders einfachen mechanischen Aufbau, insbesondere wenn die Schaltkontakte auf einem gemeinsamen Trägerelement als Stellglied angeordnet sind.This measure enables a particularly simple mechanical Structure, especially if the switch contacts on one common support element are arranged as an actuator.

In einer weiteren Ausgestaltung der zuvor genannten Maßnahme sind die Kontaktflächen auf eine Platine aufgebrachte Leiterbahnstrukturen. In a further embodiment of the measure mentioned above are the contact areas on a printed circuit board.

Mit dieser Maßnahme sind die beiden Eingangsschalter auf fehlersichere Art und Weise auch in sehr großen Stückzahlen zu produzieren, was die Kosten für die beiden Eingangsschalter minimiert. Gleichzeitig ist es dabei möglich, durch ein geeignetes Design der Leiterbahnstrukturen Schaltbahnen bereitzustellen, die eine interne Schaltungslogik beinhalten. Infolgedessen können auch komplizierte Schaltungsschemata auf einfache und reproduzierbare Art und Weise realisiert werden. Zudem wird durch die genannte Maßnahme die Fehlersicherheit nochmals gesteigert, da Leiterbahnstrukturen im Betrieb der Vorrichtung keinem oder allenfalls einem äußerst geringen Verschleiß unterliegen, so daß ein nachträglich erst im Betrieb der Vorrichtung auftretender Fehler weitgehend ausgeschlossen ist. Ebenso ist die Gefahr nachträglich auftretender Quer- oder Kurzschlüsse reduziert.With this measure, the two input switches are on fail-safe Way even in very large numbers produce what minimizes the cost of the two input switches. At the same time, it is possible to use a suitable one Design of the conductor track structures to provide switching tracks, which contain internal circuit logic. Consequently can also create complicated circuit diagrams on simple and reproducible way can be realized. In addition, the error measure further increases the reliability, since conductor track structures in the operation of the device are not subject to any wear or at most extremely little wear, so that a subsequent operation of the device occurring errors is largely excluded. Likewise the risk of subsequent cross-circuits or short-circuits reduced.

In einer weiteren Ausgestaltung der Erfindung sind der erste und zweite Eingangsschalter jeweils Mehrstellungsschalter.In a further embodiment of the invention, the first and second input switches each multi-position switch.

Diese Maßnahme ist besonders einfach in Kombination mit den zuvor genannten Ausgestaltungen der Erfindung zu realisieren. Sie besitzt den Vorteil, daß die erfindungsgemäße Sicherheitsschaltvorrichtung vielfache Einstellmöglichkeiten erhält, wodurch ihr Einsatzspektrum und ihre Adaptierbarkeit verbessert werden. Infolge dessen lassen sich größere Stückzahlen produzieren, die eine Kostenreduktion zur folge haben.This measure is particularly simple in combination with the previous ones to implement the embodiments of the invention mentioned. she has the advantage that the safety switching device according to the invention receives multiple setting options, whereby their range of use and their adaptability improved become. As a result, larger quantities can be produced, which result in a cost reduction.

In einer weiteren Ausgestaltung der Erfindung weisen der erste und zweite Eingangsschalter eingangsseitige und ausgangsseitige Anschlußkontakte auf, die jeweils in einer Matrixstruktur zueinander angeordnet sind. In a further embodiment of the invention, the first and second input switches on the input side and output side Connection contacts, each in a matrix structure to each other are arranged.

Diese Maßnahme besitzt den Vorteil, daß die Anzahl der benötigten Anschlußkontakte für die beiden Eingangsschalter reduziert werden kann, was ebenfalls eine Verkleinerung des erforderlichen Bauraums ermöglicht. Darüber hinaus vereinfacht sich auch hierdurch die Montage.This measure has the advantage that the number of required Connection contacts for the two input switches reduced can be, which is also a reduction in the required Space allows. It also simplifies thereby the assembly.

In einer weiteren Ausgestaltung der zuvor genannten Maßnahme sind die eingangsseitigen Anschlußkontakte des ersten und des zweiten Eingangsschalters miteinander verbunden.In a further embodiment of the measure mentioned above are the input contacts of the first and second input switch connected together.

Durch diese Maßnahme wird die Anzahl der erforderlichen Anschlüsse für die beiden Eingangsschalter nochmals reduziert. So ist es aufgrund dieser Maßnahme beispielsweise möglich, 16 zueinander redundante Schaltstellungen, d.h. insgesamt 32 Schaltstellungen, mit nur insgesamt 12 Anschlußkontakten bereitzustellen. Infolgedessen kann der Bauraum der erfindungsgemäßen Anordnung nochmals reduziert und die Montage vereinfacht werden.This measure reduces the number of connections required reduced again for the two input switches. So this measure makes it possible, for example, to 16 each other redundant switch positions, i.e. a total of 32 switch positions, with only a total of 12 connection contacts. As a result, the space of the invention Arrangement reduced again and the assembly can be simplified.

Es versteht sich, daß die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the above and those below Features to be explained not only in each case specified combination, but also in other combinations or can be used alone without the scope of the to leave the present invention.

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
den Schaltungsaufbau einer erfindungsgemäßen Sicherheitsschaltvorrichtung in Form eines Sicherheitsschaltgerätes;
Fig. 2
ein Sicherheitsschaltgerät, wie es von der Anmelderin der vorliegenden Erfindung vertrieben wird, im Querschnitt;
Fig. 3
das erfindungsgemäße Sicherheitsschaltgerät aus Fig. 1 im Querschnitt;
Fig. 4
eine Eingangsschaltereinheit des Sicherheitsschaltgeräts aus Fig. 3 entlang der Linie IV-IV;
Fig. 5
die Eingangsschaltereinheit des Sicherheitsschaltgeräts aus Fig. 3 entlang der Linie V-V; und
Fig. 6
eine bevorzugte Matrixstruktur, in der eingangsseitige und ausgangsseitige Schaltkontakte von zwei zueinander redundanten Eingangsschaltern angeordnet sind.
Embodiments of the invention are shown in the drawing and are explained in more detail in the following description. Show it:
Fig. 1
the circuit structure of a safety switching device according to the invention in the form of a safety switching device;
Fig. 2
a safety switching device, as sold by the applicant of the present invention, in cross section;
Fig. 3
the safety switching device according to the invention from Figure 1 in cross section.
Fig. 4
an input switch unit of the safety switching device of Figure 3 along the line IV-IV.
Fig. 5
the input switch unit of the safety switching device of Figure 3 along the line VV. and
Fig. 6
a preferred matrix structure in which the input-side and output-side switching contacts of two mutually redundant input switches are arranged.

In Fig. 1 ist eine erfindungsgemäße Sicherheitsschaltvorrichtung in Form eines Sicherheitsschaltgeräts in ihrer Gesamtheit mit der Bezugsziffer 10 bezeichnet.1 is a safety switching device according to the invention in the form of a safety switching device in its entirety designated with the reference number 10.

Das Sicherheitsschaltgerät 10 besitzt zwei zueinander redundante Eingangsschalter 12 und 14, die hinsichtlich ihrer Schaltstellung über ein hier nur schematisch dargestelltes, gemeinsames Stellglied 16 miteinander verkoppelt sind. Die Eingangsschalter 12, 14 sind in identischer Weise in jeweils einen Spannungsteiler eingebunden, der aus jeweils einem Widerstand 18a, 18b sowie jeweils einer Widerstandsgruppe 20a, 20b besteht. Die Widerstandsgruppen 20a, 20b beinhalten im vorliegenden Ausführungsbeispiel drei zueinander parallel angeordnete Widerstände mit unterschiedlichen Widerstandswerten. Über den beiden Spannungsteilern liegt eine Betriebsspannung, die im vorliegenden Ausführungsbeispiel 24 V beträgt. Die beiden Spannungsteiler erzeugen in Abhängigkeit von der jeweiligen Schaltstellung der Eingangsschalter 12, 14 ein Ausgangssignal, das über jeweils einen weiteren Widerstand 22a, 22b einem Zeitglied 24a, 24b zugeführt ist. Die Zeitglieder 24a, 24b definieren redundant zueinander und in Abhängigkeit von der jeweils erhaltenen Spannung eine Zeitkonstante, die einer Auswerte- und Steuereinheit 26 zugeführt ist. Die erhaltene Spannung hängt dabei von der jeweiligen Schaltstellung der beiden Eingangsschalter 12, 14 ab.The safety switching device 10 has two mutually redundant ones Input switches 12 and 14 with regard to their switching position about a common, shown only schematically here Actuator 16 are coupled together. The input switches 12, 14 are in an identical manner in one Integrated voltage divider, each consisting of a resistor 18a, 18b and a resistance group 20a, 20b. The resistance groups 20a, 20b include here Embodiment three arranged parallel to each other Resistors with different resistance values. On the both voltage dividers is an operating voltage, which in present embodiment is 24 V. The two voltage dividers generate depending on the respective switching position the input switch 12, 14 an output signal that a timer in each case via a further resistor 22a, 22b 24a, 24b is supplied. Define timers 24a, 24b redundant to each other and depending on the respectively received Voltage is a time constant that of an evaluation and Control unit 26 is supplied. The tension obtained depends thereby from the respective switching position of the two input switches 12, 14 from.

Die Auswerte- und Steuereinheit 26 ist in dem vorliegenden Ausführungsbeispiel zweikanalig ausgebildet und weist in jedem Kanal einen Mikrocontroller 28a, 28b auf. Die Mikrocontroller 28a, 28b werten darüber hinaus hier nicht dargestellte, weitere Eingangssignale aus, die beispielsweise von einem Not-Aus-Taster oder einer Schutztür generiert werden. In Abhängigkeit von diesen Eingangssignalen sowie den redundant zueinander definierten Zeitkonstanten steuern die Mikrocontroller 28a, 28b jeweils Ausgangsschaltkontakte 30a, 30b an. Die Ausgangsschaltkontakte 30a, 30b sind seriell zueinander in einem Stromversorgungspfad einer Maschinenanlage 32 angeordnet.The evaluation and control unit 26 is in the present exemplary embodiment trained in two channels and points in each channel a microcontroller 28a, 28b. The microcontrollers 28a, 28b also evaluate others not shown here Input signals from, for example, an emergency stop button or a protective door can be generated. Dependent on of these input signals as well as the redundantly defined to each other The microcontrollers 28a, 28b control time constants output switch contacts 30a, 30b, respectively. The output switch contacts 30a, 30b are in series with each other in a power supply path a machine system 32 is arranged.

Die Erfindung ist nicht auf Sicherheitsschaltvorrichtungen mit kontaktbehafteten Ausgängen beschränkt. Anstelle der hier verwendeten Relaiskontakte 30a, 30b können auch Halbleiterelemente als Ausgangsschaltelemente verwendet werden.The invention is not based on safety switching devices limited contact outputs. Instead of the one used here Relay contacts 30a, 30b can also semiconductor elements can be used as output switching elements.

Das gesamte Sicherheitsschaltgerät 10 ist in einem Gehäuse 34 untergebracht, das in an sich bekannter Weise Anschlußklemmen 36 zum Anschließen der Stromversorgung sowie der Maschinenanlage 32 aufweist.The entire safety switching device 10 is in a housing 34 housed, the terminals in a conventional manner 36 for connecting the power supply and the machine system 32 has.

Bei der nachfolgenden Beschreibung der weiteren Figuren bezeichnen gleiche Bezugsziffern dieselben Elemente wie in Fig. 1.Designate in the following description of the other figures same reference numerals the same elements as in Fig. 1.

In Fig. 2 ist ein gattungsgemäßes Sicherheitsschaltgerät, wie es von der Anmelderin der vorliegenden Erfindung vertrieben wird, in seiner Gesamtheit mit der Bezugsziffer 40 bezeichnet.In Fig. 2 is a generic safety switching device, such as sold by the assignee of the present invention is designated in its entirety by the reference number 40.

Das Gehäuse 34 des Sicherheitsschaltgeräts 40 läßt in der vorliegenden Querschnittsdarstellung eine Frontseite 42 sowie zwei Seitenwände 44, 46 erkennen. Im Inneren des Gehäuses 34 sind entlang der beiden Seitenwände 44, 46 jeweils Bauelementeträger in Form von sogenannten Platinen 48, 50 angeordnet. Beispielhaft sind auf der Platine 48 einzelne Bauelemente mit den Bezugsziffern 52 und 54 bezeichnet. Ebenfalls beispielhaft ist auf der Platine 50 das vergleichsweise große Gehäuse eines Relais 56 dargestellt, das die Ausgangsschaltkontakte 30a, 30b beinhaltet.The housing 34 of the safety switching device 40 leaves in the present Cross-sectional representation of a front 42 and two Recognize side walls 44, 46. Are inside the housing 34 along the two side walls 44, 46 each component carrier arranged in the form of so-called boards 48, 50. exemplary are 48 individual components with the reference numerals on the board Denoted 52 and 54. It is also exemplary on the board 50 the comparatively large housing of a relay 56 shown that the output switch contacts 30a, 30b includes.

Mit den Bezugsziffern 58 und 60 sind zwei weitere Platinen bezeichnet, die parallel zu der Frontseite 42 und parallel zueinander zwischen den Platinen 48 und 50 befestigt sind. Neben weiteren Bauelementen 52, 54 befinden sich auf diesen beiden Platinen die Eingangsschalter 12 und 14. Dabei handelt es sich hier um Drehschalter, die unter- bzw. hintereinander auf einer gemeinsamen Welle 62 befestigt sind. Die Welle 62 tritt an der Frontseite 42 des Gehäuses 34 nach außen und ist dort mit einem Drehknopf 64 verbunden. Die Welle 62 bildet somit ein gemeinsames Stellglied für die beiden Eingangsschalter 12 und 14. Dabei sind die Schaltkontakte der beiden Eingangsschalter 12 und 14, wie anhand der Darstellung in Fig. 2 zu erkennen ist, in unterschiedlichen, parallel zueinander versetzten Ebenen 66, 68 angeordnet.The reference numbers 58 and 60 denote two further boards, the parallel to the front 42 and parallel to each other are fixed between the boards 48 and 50. Next further components 52, 54 are located on these two Circuit boards the input switches 12 and 14. These are here about rotary switches, one below the other or one behind the other common shaft 62 are attached. The shaft 62 occurs on the Front 42 of the housing 34 to the outside and is there with a Knob 64 connected. The shaft 62 thus forms a common one Actuator for the two input switches 12 and 14 are the switching contacts of the two input switches 12 and 14, as can be seen from the illustration in FIG. 2, in different arranged parallel to each other planes 66, 68.

Wie in Fig. 3 zu erkennen ist, unterscheidet sich das erfindungsgemäße Sicherheitsschaltgerät 10 von dem bekannten Sicherheitsschaltgerät 40 unter anderem dadurch, daß auf die beiden parallel zur Frontseite 42 angeordneten Platinen 58, 60 verzichtet werden kann. Statt dessen befinden sich die beiden Eingangsschalter 12 und 14 bei diesem Ausfuhrungsbeispiel in einer gemeinsamen Eingangsschaltereinheit 70, deren Aufbau nachfolgend anhand der Figuren 4 und 5 näher erläutert wird. Die Eingangsschaltereinheit 70 ist über Kontaktstifte 72 mit der Platine 48 verbunden. Diese Anordnung gibt jedoch nur ein mögliches Ausführungsbeispiel wider. As can be seen in Fig. 3, the invention differs Safety switching device 10 from the known safety switching device 40 among other things by the fact that on the two Boards 58, 60 arranged parallel to the front side 42 are dispensed with can be. Instead, the two input switches are located 12 and 14 in this exemplary embodiment in one common input switch unit 70, the structure of which follows is explained in more detail with reference to FIGS. 4 and 5. The input switch unit 70 is via pins 72 to the board 48 connected. However, this arrangement is only one possible Embodiment reflected.

In alternativen Ausführungsbeispielen kann die Eingangsschaltereinheit 70 auch über eine parallel zur Frontseite 42 angeordnete Platine 58 kontaktiert sein. Im Unterschied zu dem bekannten Sicherheitsschaltgerät 40 ist eine derartige Platine 58 sowie eine parallel dazu angeordnete zweite Platine 60 hier jedoch nicht unbedingt erforderlich.In alternative embodiments, the input switch unit 70 also arranged parallel to the front side 42 Board 58 may be contacted. In contrast to the known one Safety switching device 40 is such a circuit board 58 as well as a second circuit board 60 arranged parallel thereto, however not necessarily required.

Gemäß den Figuren 4 und 5 weist die Eingangsschaltereinheit 70 ein Schaltergehäuse 74 auf, in dem die mechanischen Betätigungsteile untergebracht sind. Das Schaltergehäuse 74 ist auf einer Platine 76 angeordnet. Die Platine 76 weist auf ihrer dem Schaltergehäuse 74 zugewandten Seite mehrere entlang von Kreisbahnen verlaufende Leiterbahnen 78, 80, 82, 84 auf. Jede der Leiterbahnen 78 bis 84 ist mit jeweils einem Kontaktstift 72 verbunden, wobei die Verbindungen für die Leiterbahnen 82 und 84 in dem vorliegenden Ausführungsbeispiel auf der Rückseite der Platine 76 ausgeführt sind, was durch die gepunktete Linie dargestellt ist.According to FIGS. 4 and 5, the input switch unit 70 has a switch housing 74 in which the mechanical actuating parts are accommodated. The switch housing 74 is open a circuit board 76. The board 76 has on that Switch housing 74 side facing several along circular paths running conductor tracks 78, 80, 82, 84. Each of the Conductor tracks 78 to 84 each have a contact pin 72 connected, the connections for the conductor tracks 82 and 84 in the present embodiment on the back the board 76 are executed, which is indicated by the dotted line is shown.

In dem Schaltergehäuse 74 der Eingangsschaltereinheit 70 ist eine kreisförmige Trägerscheibe 86 angeordnet, die in Richtung des Pfeils 88 drehbar ist. Die Betätigung der Trägerscheibe 86 erfolgt wahlweise durch einen von zwei Tastern 90, 92, die jeweils tangential und parallel zueinander entlang zweier Seitenwände des Schaltergehäuses 74 angeordnet sind. Auf der der Platine 76 abgewandten Seite weist die Trägerscheibe 86 eine sternförmige Struktur 94 auf, in die Nocken 96, 98 der beiden Taster 90, 92 eingreifen können. An ihrem in Fig. 4 unten liegenden Ende sind die Taster 90, 92 mit Federn 100, 102 gegen die Rückwand des Schaltergehäuses 74 abgestützt. Die Betätigung eines der beiden Taster 90, 92 hat somit zur Folge, daß die Trägerscheibe 86 um jeweils einen Zahn der sternförmigen Struktur 94 in Richtung des Pfeils 88 gedreht wird.In the switch housing 74 of the input switch unit 70 a circular support disc 86 arranged in the direction of arrow 88 is rotatable. The actuation of the carrier disk 86 is optionally carried out by one of two buttons 90, 92, each tangential and parallel to each other along two side walls of the switch housing 74 are arranged. On the board 76 facing away from the carrier disc 86 one star-shaped structure 94, in the cams 96, 98 of the two Push buttons 90, 92 can intervene. At their bottom in Fig. 4 At the end, the buttons 90, 92 with springs 100, 102 are against supported the rear wall of the switch housing 74. The actuation one of the two buttons 90, 92 has the consequence that the Carrier disc 86 around one tooth of the star-shaped structure 94 is rotated in the direction of arrow 88.

Der mechanische Aufbau derartiger Schalter ist an sich bekannt. Beispielsweise wird ein mechanisch vergleichbarer Schalter unter der Bezeichnung "Zweitast-Kodierschalter" von der Firma Fritz Hartmann Gerätebau GmbH & Co. KG in 91083 Baiersdorf, Deutschland, vertrieben.The mechanical structure of such switches is known per se. For example, a mechanically comparable switch is under the designation "two-button coding switch" from the company Fritz Hartmann Gerätebau GmbH & Co. KG in 91083 Baiersdorf, Germany, distributed.

Im Unterschied zu diesen bekannten Zweitast-Kodierschaltern befinden sich in dem vorliegenden Ausführungsbeispiel auf der der Platine 76 zugewandten Seite der Trägerscheibe 86 jedoch zwei voneinander getrennte Schleifkontaktpaare 104 und 106, die radial versetzt zueinander angeordnet sind. Das Schleifkontaktpaar 104 wirkt dabei mit den Leiterbahnen 78 und 80 zusammen, während das Schleifkontaktpaar 106 mit den Leiterbahnen 82 und 84 zusammenwirkt. Befindet sich das Schleifkontaktpaar 104 in einem Winkelbereich oberhalb der Diagonalen 108 gemäß Fig. 5, stellt es eine leitfähige Verbindung zwischen den ansonsten galvanisch getrennten Leiterbahnen 78 und 80 her. In diesem Fall ist der Eingangsschalter 12 zwischen den Kontaktstiften 72 und 73 geschlossen.In contrast to these known two-button coding switches in the present embodiment on the Board 76 facing side of the carrier plate 86, however, two mutually separate sliding contact pairs 104 and 106, the radial are staggered. The pair of sliding contacts 104 interacts with conductor tracks 78 and 80, while the sliding contact pair 106 with the conductor tracks 82 and 84 cooperates. The sliding contact pair 104 is located in an angular range above the diagonal 108 according to FIG. 5, it establishes a conductive connection between the otherwise galvanically isolated interconnects 78 and 80 ago. In this The case is the input switch 12 between the contact pins 72 and 73 closed.

Befindet sich das Schleifkontaktpaar 104 demgegenüber in einer Winkelposition, die unterhalb der Diagonalen 108 gemäß Fig. 5 liege, besteht keine leitfahige Verbindung zwischen den Leiterbahnen 78 und 80, so daß der Schalter zwischen den Kontaktstiften 72 und 73 geöffnet ist.In contrast, the sliding contact pair 104 is in one Angular position that is below the diagonal 108 according to FIG. 5 there is no conductive connection between the conductor tracks 78 and 80 so that the switch between the contact pins 72 and 73 is open.

Gleiches gilt in identischer Weise für das Schleifkontaktpaar 106, das mit den Leiterbahnen 82 und 84 zusammenwirkt. Die Leiterbahnen 78 bis 84 sind dabei auf der Platine 76 derart zueinander angeordnet, daß die hierdurch realisierten Eingangsschalter 12 und 14 jeweils zeitgleich und redundant zueinander schalten.The same applies in an identical manner to the pair of sliding contacts 106, which interacts with the conductor tracks 82 and 84. The conductor tracks 78 to 84 are in this way to one another on the circuit board 76 arranged that the input switch realized thereby 12 and 14 each simultaneously and redundantly to each other turn.

Wie leicht nachzuvollziehen ist, ergibt sich die Schaltlogik der Eingangsschaltereinheit 70 vor allem aus der Anordnung der Leiterbahnen 78 bis 84 auf der Platine 76. Das vorliegende Ausführungsbeispiel ist dabei zur Erläuterung der Erfindung bewußt einfach gewählt. Es versteht sich jedoch, daß durch eine geeignete Wahl der Leiterbahnenstruktur auch redundante Mehrstellungsschalter realisierbar sind.The switching logic is easy to understand the input switch unit 70 mainly from the arrangement of Conductor tracks 78 to 84 on the circuit board 76. The present exemplary embodiment is aware of the invention simply chosen. However, it is understood that by an appropriate Choice of trace structure also redundant multi-position switches are realizable.

Die Eingangsschaltereinheit 70 ist ein besonders bevorzugtes Ausführungsbeispiel für ein erfindungsgemäßes Sicherheitsschaltgerät 10. Wie anhand Fig. 3 zu erkennen ist, liegen die Schleifkontaktpaare 104, 106 sowie die Leiterbahnstrukturen 78 bis 84, d.h. sämtliche Schaltkontakte der beiden Eingangsschalter 12 und 14, dabei innerhalb einer gemeinsamen Ebene 110. Die Verwendung eines Zweitast-Schalters der gezeigten Art ist dabei für die Realisierung der Erfindung jedoch nicht unbedingt erforderlich. In alternativen Ausführungsbeispielen der Erfindung kann die Trägerscheibe 86 beispielsweise auch über eine Welle 62 sowie einen Drehknopf 64 verstellt werden, wie dies von dem Sicherheitsschaltgerät 40 bekannt ist.The input switch unit 70 is a particularly preferred one Embodiment for a safety switching device according to the invention 10. As can be seen from FIG. 3, the Slip contact pairs 104, 106 and the conductor track structures 78 up to 84, i.e. all switching contacts of the two input switches 12 and 14, thereby within a common level 110. The use of a two-button switch of the type shown is not essential for the implementation of the invention required. In alternative embodiments of the According to the invention, the carrier disk 86 can also be used, for example a shaft 62 and a knob 64 can be adjusted, such as this is known from the safety switching device 40.

Bei Verwendung von Mehrstellungsschaltern für die Eingangsschalter 12 und 14 erhöht sich die Anzahl der erforderlichen Kontaktstifte grundsätzlich doppelt so stark wie die Anzahl der gewünschten Schaltstellungen. Hinzu kommt der Faktor zwei für die redundante Auslegung des Sicherheitsschaltgeräts 10. Bei 16 gewünschten Schaltstellungen wären somit an sich 64 Kontaktstifte bzw. entsprechende Anschlußmöglichkeiten erforderlich. Diese Anzahl läßt sich durch eine geeignete Codierung der Schaltstellungen mit Hilfe einer Matrixstruktur reduzieren.When using multi-position switches for the input switches 12 and 14 increases the number of required Contact pins are basically twice the number of desired switch positions. Added to this is the factor two for the redundant design of the safety relay 10. At 16 Desired switching positions would be 64 contact pins per se or appropriate connection options required. This number can be suitably encoded Reduce switching positions using a matrix structure.

Fig. 6 zeigt ein bevorzugtes Ausführungsbeispiel einer Matrixstruktur 120 für die Eingangsschalter 12 und 14. Die Matrixstruktur 120 weist dabei vier Anschlußkontakte 122 auf, die parallel Schaltkontakten 124, 126 der beiden Eingangsschalter 12 und 14 zugeführt sind. Im vorliegenden Ausführungsbeispiel sind die einander zugeordneten Schaltkontakte 124, 126 um jeweils einen Schritt zueinander verschoben, d.h. es ist hier der in Fig. 6 oberste Schaltkontakt 124 des Eingangsschalters 12 mit dem in Fig. 6 zweit-obersten Schaltkontakt 126 des Eingangsschalters 14 verbunden. Alternativ hierzu können die Schaltkontakte 124, 126 der beiden Eingangsschalter 12 und 14 jedoch auch um andere Schrittweiten verschoben miteinander verbunden werden. Dabei ist auch eine Schrittweite von Null, d.h. eine spiegelbildliche Zuordnung der Schaltkontakte 124, 126 zueinander möglich.6 shows a preferred exemplary embodiment of a matrix structure 120 for the input switches 12 and 14. The matrix structure 120 has four connection contacts 122, the parallel switch contacts 124, 126 of the two input switches 12 and 14 are supplied. In the present embodiment are the mutually assigned switching contacts 124, 126 by shifted one step towards each other, i.e. it is here 6 top switching contact 124 of the input switch 12 with the second uppermost switch contact 126 of the input switch in FIG. 6 14 connected. Alternatively, the Switch contacts 124, 126 of the two input switches 12 and 14 but also linked by other increments become. There is also a step size of zero, i.e. a mirror-image assignment of the switching contacts 124, 126 to one another possible.

Die ausgangsseitigen Schaltkontakte 132, 134 der beiden Eingangsschalter 12 und 14 sind getrennt voneinander auf ausgangsseitige Anschlußkontakte 136, 138 geführt. Aufgrund der Matrixanordnung läßt sich dabei durch Vergleich bzw. Auswertung der Signale an den eingangsseitigen Anschlußkontakten 122 und den ausgangsseitigen Anschlußkontakten 136, 138 die jeweils aktuelle Schaltstellung der Eingangsschalter 12 und 14 bestimmen. Mit der gezeigten Matrixstruktur 120 ist dabei aufgrund der gemeinsamen eingangsseitigen Anschlußkontakte 122 und der getrennten ausgangsseitigen Anschlußkontakte 132, 134 eine fehlersichere Auswertung mit einer minimalen Anzahl von Anschlußkontakten möglich.The output-side switching contacts 132, 134 of the two input switches 12 and 14 are separated from one another on the output side Connection contacts 136, 138 performed. Because of the matrix arrangement can be compared or evaluated of the signals at the input contacts 122 and the current-side connection contacts 136, 138 Determine the switching position of the input switches 12 and 14. The matrix structure 120 shown here is due to the common input-side connection contacts 122 and the separate output-side connection contacts 132, 134 a fail-safe Evaluation with a minimum number of connection contacts possible.

Claims (9)

  1. A safety switching apparatus for safely stopping a machine system from which a hazard originates, said apparatus having a first (12) and a second (14) input switch, whose respective switch settings define an input-side manipulated variable (Δt) at the same time and redundantly with respect to one another, having at least one output switching element (30a, 30b) which is arranged in an output circuit of the safety switching apparatus (10), and having an evaluation and control unit (26) which drives the at least one output switching element (30a, 30b) as a function of the defined manipulated variable (Δt), with the evaluation and control unit (26) having two channels, with a first channel (28a) being connected to the first input switch (12), and a second channel (28b) being connected to the second input switch (14), and with the switching contacts (104, 106) of the first (12) and of the second (14) input switch being coupled to one another, in terms of their switch positions, via a common actuating member (16), characterized in that the switching contacts (104, 106) of the first (12) and of the second (14) input switch are spatially arranged in one plane (110) and that the actuating member (16) comprises a common circular mounting element (86), on which the switching contacts (104, 106) of the first (12) and of the second (14) input switch are arranged radially offset with respect to one another.
  2. The safety switching apparatus of claim 1, characterized in that the common mounting element (86) can be rotated for adjustment.
  3. The safety switching apparatus of claim 1 or 2, characterized in that the common mounting element (86) is a mounting disk.
  4. The safety switching apparatus of any of claims 1 to 3, characterized in that the first (12) and the second (14) input switch as well as the common actuating member (16) are enclosed by a common switch enclosure (74).
  5. The safety switching apparatus of any of claims 1 to 4, characterized in that the switching contacts (104, 106) of the first (12) and of the second (14) input switch are sliding contacts, which can be moved over stationary contact surfaces (78, 80, 82, 84) by means of the actuating member (16).
  6. The safety switching apparatus of claim 5, characterized in that the contact surfaces (78, 80, 82, 84) are conductive track structures which are applied to a printed circuit board (76).
  7. The safety switching apparatus of any of claims 1 to 6, characterized in that the first (12) and the second (14) input switch are each multiposition switches.
  8. The safety switching apparatus of any of claims 1 to 7, characterized in that the first (12) and the second (14) input switch have input-side (122) and output-side (136, 138) connecting contacts, which are each arranged in a matrix structure with respect to one another.
  9. The safety switching apparatus of claim 8, characterized in that the input-side connecting contacts (122) of the first (12) and of the second (14) input switch are connected to one another.
EP01905781A 2000-02-29 2001-02-16 Safety switch device with a first and a second input circuit breaker Expired - Lifetime EP1259969B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10009707A DE10009707A1 (en) 2000-02-29 2000-02-29 Safety switch with first and second input switches which initiate electronic timers
DE10009707 2000-02-29
PCT/EP2001/001728 WO2001065577A1 (en) 2000-02-29 2001-02-16 Safety switch device with a first and a second input circuit breaker

Publications (2)

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EP1259969A1 EP1259969A1 (en) 2002-11-27
EP1259969B1 true EP1259969B1 (en) 2003-09-24

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Application Number Title Priority Date Filing Date
EP01905781A Expired - Lifetime EP1259969B1 (en) 2000-02-29 2001-02-16 Safety switch device with a first and a second input circuit breaker

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US (1) US6825579B2 (en)
EP (1) EP1259969B1 (en)
JP (1) JP2003526879A (en)
AT (1) ATE250804T1 (en)
AU (1) AU2001233771A1 (en)
DE (2) DE10009707A1 (en)
WO (1) WO2001065577A1 (en)

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DE10235502C1 (en) 2002-08-02 2003-12-24 Siemens Ag Device and method for the reliable detection of the switch position of a rotary switch
EP1484780A1 (en) 2003-06-03 2004-12-08 Siemens Aktiengesellschaft Drive control device for safety-critical components and corresponding method
DE10327959B4 (en) * 2003-06-20 2015-07-16 Siemens Aktiengesellschaft Monitoring method for at least two switching paths and wiring for a load
US7610119B2 (en) * 2003-07-08 2009-10-27 Omron Corporation Safety controller and system using same
WO2005017932A1 (en) * 2003-08-08 2005-02-24 Siemens Aktiengesellschaft Protector suitable for cascade connections and corresponding method for safety-conditioned switching
DE502005009527D1 (en) * 2004-04-19 2010-06-17 Pilz Gmbh & Co Kg MESSAGE DEVICE FOR A SAFETY CIRCUIT
US7453677B2 (en) * 2004-10-06 2008-11-18 Teknic, Inc. Power and safety control hub
WO2007014725A1 (en) 2005-08-02 2007-02-08 Phoenix Contact Gmbh & Co. Kg Safety switching unit for controlling a safety device into a safe state
US7723630B1 (en) * 2005-09-23 2010-05-25 Southwire Company Remote safety switch
DE102005048601B3 (en) 2005-10-06 2007-04-05 Pilz Gmbh & Co. Kg Position indicator e.g. potentiometer, evaluating device for safety switching device, has microcontrollers finding measuring quantities representative for indicator`s partial impedances, and having outputs assigned with high/low potential
CN101114824B (en) * 2007-06-28 2010-05-19 翁天禄 Linkage device for AC two-wire type solid state switch
DE102011081184A1 (en) * 2011-08-18 2013-02-21 Siemens Aktiengesellschaft Method for switching in an arrangement of circuit breakers and arrangement of a plurality of circuit breakers
WO2014041568A1 (en) * 2012-09-11 2014-03-20 Power-One Italy S.P.A. Safe disconnection relay

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Also Published As

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US20030057069A1 (en) 2003-03-27
AU2001233771A1 (en) 2001-09-12
US6825579B2 (en) 2004-11-30
DE50100684D1 (en) 2003-10-30
DE10009707A1 (en) 2001-09-06
JP2003526879A (en) 2003-09-09
ATE250804T1 (en) 2003-10-15
WO2001065577A1 (en) 2001-09-07
EP1259969A1 (en) 2002-11-27

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