EP2099048B2 - Modular safety control and safety relay module - Google Patents

Modular safety control and safety relay module Download PDF

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Publication number
EP2099048B2
EP2099048B2 EP08102402.8A EP08102402A EP2099048B2 EP 2099048 B2 EP2099048 B2 EP 2099048B2 EP 08102402 A EP08102402 A EP 08102402A EP 2099048 B2 EP2099048 B2 EP 2099048B2
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EP
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Prior art keywords
safety
contact
relay module
relay
contacts
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EP08102402.8A
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German (de)
French (fr)
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EP2099048B1 (en
EP2099048A1 (en
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Franz Josef Dold
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Sick AG
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Sick AG
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Priority to DE502008000712T priority Critical patent/DE502008000712D1/en
Priority to AT08102402T priority patent/ATE469432T1/en
Priority to EP08102402.8A priority patent/EP2099048B2/en
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/14—Terminal arrangements

Definitions

  • the invention relates to an arrangement of safety relay modules for fail-safe switching of relays according to the preamble of claim 1 and a safety relay module for such a modular arrangement.
  • a safety switching device is a device that receives supplied input signals from signal generators, such as emergency stop buttons, safety door switches, light barriers or light grids, and generates output signals directly or after logic operations. The output signals can then be supplied to actuators, which cause specific actions or reactions in the environment depending on the input signals, eg. B. to a machine, such as a press or a welding robot, emanating from the operation of a danger to people to hedge.
  • signal generators such as emergency stop buttons, safety door switches, light barriers or light grids
  • the output signals can then be supplied to actuators, which cause specific actions or reactions in the environment depending on the input signals, eg. B. to a machine, such as a press or a welding robot, emanating from the operation of a danger to people to hedge.
  • a signal generator z. B. when opening the protective door, pressing the emergency stop button or when a sensor responds, a signal is generated in each case, which is supplied to the safety switching device as an input signal.
  • the safety switching device then shut
  • a safety relay In contrast to a "normal" safety relay, a safety relay is characterized by the fact that the safety relay with its components must always ensure a safe state of the hazardous equipment or machine even if a malfunction occurs in the safety equipment itself or in a device connected to it. Therefore, in safety switching devices and their components extremely high demands are made on their own fault tolerance, which has a considerable effort in the development and production result. In general, not only the safety relays alone require special approval by competent supervisory authorities, such as professional associations or TÜV, but also in combination with a machine equipped with the safety relay.
  • the safety relay with its components, such as safety relays must comply with given safety standards, which are defined, for example, in the European standard EN 954-1 or ISO 13849 (performance level). The possible safety levels and the additional safety requirements for an application are defined in the standard EN 61508 or EN 62061.
  • the product standard EN 61496-1 applies to the connected signalers, which also defines monitoring signal feedback, the so-called “electronic device monitoring”, also called EDM.
  • Fig. 7 Such a contact multiplication according to the prior art is shown.
  • the reference numerals in this description are chosen such that the digit in front of a hyphen indicates the respective component of a module and the digit after the hyphen numbers the relay module.
  • An "x" after a hyphen serves as a placeholder for each relay module, meaning that a reference is made to all similar components, regardless of which module they are in.
  • the Fig. 7 shows a block diagram of an arrangement 10 of two safety relay modules 12-x, each of which has two channels and positively driven relays 16-x, 18-x have.
  • Each relay has two control contacts 20-x and 22-x or 24-x and 26-x, one of which is connected to a ground potential.
  • the two-channel, actual safety switching signal OSSD_1 (first channel) and OSSD_2 (second channel) is provided, which is provided by suitable signal generators, as described above.
  • Each relay module has two make contacts 28-x, 30-x and two openers 32-x, 34-x with switch contacts 36-x and 38-x and 40-x and 42-x, with the make contacts connected in series, see above that the 24 V feedback signal for device control EDM is guided via the make contacts by means of feedback circuit terminals 44-x and 46-x.
  • control contacts For contact multiplication, the control contacts must now be connected in parallel by the terminals 22-1 and 22-2 and 26-1 and 26-2 are to be connected to each other via separate lines 23 and 25. Since the feedback circuit must be guided by each relay, all NO must be connected in series, including the terminals 44-1 and 44-2 must be connected to each other via a separate line 45 and the return signal of 24 V to the terminal 46-2 must be rewired.
  • at least two wires must be connected, which is not only cumbersome to use, but represents another security risk.
  • the connecting terminals must be dimensioned or designed in such a way that they can accommodate two wires. But fixing two wires in a clamp can be a safety hazard since two wires in a clamp are never as secure as just one.
  • a modular arrangement with at least two safety relay modules for switching safety switch contacts, being connected in parallel for switching contact control contacts of the first relay module with control contacts of the second relay module and each relay module containing the safety relay or the housing and corresponding control contact terminals and switching contact terminals are arranged.
  • for contact multiplication in addition to the terminals at least one contact plug on the respective safety relay modules for connection of the control contacts of the adjacent two safety relay modules arranged.
  • the invention is thus already represented by a safety relay module for such a modular safety control, wherein for contact multiplication in addition to the existing terminals for control and switching contacts at least two contact plugs for connecting the control contacts with an adjacent second relay module are arranged, one of each is arranged on both sides of the housing.
  • contact plug means that the connection of the control contacts via a plug connection, so that with this term both a plug part and a socket part of a plug connection may be meant.
  • the main advantages of the invention are that on the one hand the cabling effort in the contact multiplication is significantly reduced and the other is that the contact multiplication handling and thus the installation is considerably simplified because it no longer individual wires from the terminals of a relay module be moved to the terminals of the other relay module with the aforementioned disadvantages, but it is only the contact plug to plug.
  • the contact multiplication with the invention has not only become simpler and safer, but also cheaper.
  • the flexibility is obtained, namely instead of a relay module with a plurality of switching contacts now provide several relay modules according to the invention, the switching contacts are multiplied as needed, so how only a relay with an application adapted number of switching contacts act.
  • the safety relay module preferably has a feedback circuit (EDM) with a feedback contact.
  • EDM feedback circuit
  • the return contact must be wired according to correct in the contact multiplication, which can be done automatically by the Maisestekker, especially when the contact plug and a pole of the return contact is performed.
  • the invention shows the advantages of the reduced wiring complexity, in particular when the safety relay is an at least two-channel, positively driven relay, since the amount of wiring would increase correspondingly with the number of relays without the inventive design.
  • the contact multiplication is carried out automatically by plugging the relay modules into a row.
  • a contact plug is arranged on both sides of the housing.
  • the replacement of modules or the expansion of the module series is facilitated if the modules have similar housing.
  • the housing is designed as a standard IP20 housing.
  • Fig. 1 shows an arrangement 110 of two security relay modules 112-1 and 112-2, which in the Fig. 1 are shown spaced apart to illustrate the connection between them explained below.
  • the reference numerals are chosen with the same regulation, as already mentioned above in connection with the prior art ( Fig. 7 ).
  • the safety relay modules 112-x have a housing 114-x, and control contact terminals 120-x and 122-x or 126x and switch contact terminals 136-x, 138-x, 140-x and 142-x for at least one safety Relay that in the view Fig. 1 is not recognizable but will be explained below. Furthermore, two terminals 144-x and 146-x are arranged for a return contact of a feedback loop.
  • At least one contact plug 150-1 is additionally arranged on the housing 114-1, and a contact plug 150-2 on the housing 114-2.
  • the control contacts of the adjacent relays are connected to each other, so that a switching contact multiplication is given, as explained in detail below with reference to Figure 4.
  • the contact plugs 150-x and 151-x are in Fig. 1 arranged on the front side of the housing 114-x and connected to each other via a connecting cable 152.
  • control contacts are connected to each other via the connection thus made, but also the return circuits of the adjacent relay modules.
  • return circuits are explained below using block diagrams.
  • the contact plugs 150-x and 151-x are arranged on both sides of the housing, wherein on one side of the housing (in the drawing, the left side) of the contact plug 151-x as a plug part and on the other side ( in the drawing, the right side) is designed as a socket part, so that the contact is multiplied by simply joining or mating adjacent relay modules.
  • Fig. 3 shows the block diagram of a first embodiment of the safety relay module 112-x with two positively driven relay 116-x and 118-x, which are controlled via control contacts 120-x and 122-x and 126-x.
  • the safety control signals come, for example, from a signal generator 200, not shown, which supplies two redundant safety signals OSSD_1 and OSSD_2.
  • Each relay has a normally open contact and a normally closed contact, with the normally open contacts of the two relays connected in series via a connection line 119-x, to provide a feedback loop with feedback contacts 144-x in 146-x for checking (Electronic Device Monitoring, abbreviated to EDM) connected signal generator and the relay.
  • EDM Electronic Device Monitoring
  • more than one closer for example, two may be assigned to a relay, so that two parallel closer paths are given. Then must be connected via two parallel connecting lines, the normally open one relay to the normally open relay of the other relay, so that in each case two make different relays are connected in series. This then provides two parallel feedback circuits, both of which can be controlled by each relay. This is useful, for example, for higher security requirements.
  • contacts 120-x, 122-x and 126-x are routed to contact plugs 150-x and 151-x by the switch contacts.
  • the return contact 144-x on the contact plug 150-x and the return contact 146-x on the Kunststoffestekker 151-x out.
  • switching contact multiplication can be easily established by connecting two adjacent safety relay modules 112-1 and 112-2 via their contact plugs 150-1 and 151-2, as shown in FIG Fig. 4 is shown. Then, the control contacts of respective relays 116-1 and 116-2 and 118-1 and 118-2 are connected to each other. Also then the feedback circuits of both relay modules are connected in series and device control only the 24 V signal for the feedback loop must be rewired from the return contact 144-1 of the first relay module 112-1 on the return contact 144-2 of the second relay module 112-2.
  • a simple signaling contact 180 can also be connected via the contact plug to a safety relay module 112-x according to the invention, as in FIG Fig. 6 shown, with a simple signal contact no feedback required and therefore a corresponding bypass line 184 is guided by contact plug 191 to the other contact plug 190.
  • the signaling contact responds to the OSSD_1 or OSSD_2 signal.
  • Each module can be housed in a similar housing.
  • the housing can be an IP20 housing system.
  • the housing may also be designed in a higher protection class, such as, for example, IP65.

Abstract

The safety relay module arrangement (110) has two safety relay modules (112-1,112-2) for switching of safety switching contacts (120-1,122-1,126-1). The control contacts of a relay module are switched with control contacts of another relay module in parallel manner, for switching contact multiplication, and each relay module has housing (114-1,114-2) containing safety relays. A contact plug (151-1,151-2) is arranged on the respective safety relay module for the connection of the control contact of the neighboring two safety relay modules, for switching contact multiplication.

Description

Die Erfindung betrifft eine Anordnung von Sicherheits-Relaismodulen zum fehlersicheren Schalten von Relais nach dem Oberbegriff von Anspruch 1 sowie ein Sicherheits-Relaismodul für eine solche modulare Anordnung.The invention relates to an arrangement of safety relay modules for fail-safe switching of relays according to the preamble of claim 1 and a safety relay module for such a modular arrangement.

Derartige Sicherheits-Relaismodulanordnungen werden in Sicherheitsschaltgeräten eingesetzt. Ein Sicherheitsschaltgerät ist eine Vorrichtung, die von Signalgebern, wie Not-Aus-Taster, Schutztürschalter, Lichtschranken oder Lichtgitter, gelieferte Eingangssignale aufnimmt und daraus direkt oder nach logischen Verknüpfungen Ausgangssignale erzeugt. Die Ausgangssignale können dann Aktuatoren zugeführt werden, die in Abhängigkeit von den Eingangssignalen gezielte Aktionen oder Reaktionen in der Umgebung bewirken, z. B. um eine Maschine, wie eine Presse oder einen Schweißroboter, von der im Betrieb eine Gefahr für Menschen ausgeht, abzusichern. Beim Ansprechen eines Signalgebers, z. B. beim Öffnen der Schutztür, Betätigen des Not-Aus-Tasters oder beim Ansprechen eines Sensors wird jeweils ein Signal erzeugt, das dem Sicherheitsschaltgerät als Eingangssignal zugeführt ist. In Reaktion darauf schaltet das Sicherheitsschaltgerät dann beispielsweise mit Hilfe eines Aktuators den gefahrbringenden Teil der Maschine ab bzw. setzt die Maschine in einen gefahrlosen Zustand.Such safety relay module arrangements are used in safety switching devices. A safety switching device is a device that receives supplied input signals from signal generators, such as emergency stop buttons, safety door switches, light barriers or light grids, and generates output signals directly or after logic operations. The output signals can then be supplied to actuators, which cause specific actions or reactions in the environment depending on the input signals, eg. B. to a machine, such as a press or a welding robot, emanating from the operation of a danger to people to hedge. When addressing a signal generator, z. B. when opening the protective door, pressing the emergency stop button or when a sensor responds, a signal is generated in each case, which is supplied to the safety switching device as an input signal. In response to this, the safety switching device then shuts off the dangerous part of the machine, for example with the aid of an actuator, or places the machine in a safe state.

Charakteristisch an einem Sicherheitsschaltgerät ist im Gegensatz zu einem "normalen" Sicherheitsschaltgerät, dass das Sicherheitsschaltgerät mit seinen Komponenten selbst dann, wenn bei ihm oder einem mit ihm verbundenen Gerät eine Fehlfunktion auftritt, stets einen sicheren Zustand der gefahrbringenden Anlage oder Maschine gewährleisten muss. Daher werden bei Sicherheitsschaltgeräten und deren Komponenten extrem hohe Anforderungen an die eigene Fehlersicherheit gestellt, was einen erheblichen Aufwand bei der Entwicklung und Herstellung zur Folge hat. In der Regel benötigen nicht nur die Sicherheitsschaltgeräte alleine eine besondere Zulassung durch zuständige Aufsichtsbehörden, wie Berufsgenossenschaften oder TÜV, sondern zusätzlich in Kombination mit einer mit dem Sicherheitsschaltgerät ausgerüsteten Maschine. Das Sicherheitsschaltgerät mit seinen Komponenten, wie Sicherheits-Relais, muss dabei vorgegebene Sicherheitsstandards einhalten, die beispielsweise in der europäischen Norm EN 954-1 bzw. ISO 13849 (performance level) definiert sind. Die möglichen Sicherheitsstufen und die weiteren Sicherheitsanforderungen an eine Anwendung sind in der Norm EN 61508 bzw. EN 62061 definiert.In contrast to a "normal" safety relay, a safety relay is characterized by the fact that the safety relay with its components must always ensure a safe state of the hazardous equipment or machine even if a malfunction occurs in the safety equipment itself or in a device connected to it. Therefore, in safety switching devices and their components extremely high demands are made on their own fault tolerance, which has a considerable effort in the development and production result. In general, not only the safety relays alone require special approval by competent supervisory authorities, such as professional associations or TÜV, but also in combination with a machine equipped with the safety relay. The safety relay with its components, such as safety relays, must comply with given safety standards, which are defined, for example, in the European standard EN 954-1 or ISO 13849 (performance level). The possible safety levels and the additional safety requirements for an application are defined in the standard EN 61508 or EN 62061.

Für die angeschlossenen Signalgeber gilt unter anderem die Produktnorm EN 61496-1, in der auch eine Überwachungssignalrückführung, das so genannte "Electronic Device Monitoring", auch EDM genannt, definiert ist.Among other things, the product standard EN 61496-1 applies to the connected signalers, which also defines monitoring signal feedback, the so-called "electronic device monitoring", also called EDM.

Die vorerwähnte Betätigung von Aktuatoren erfolgt häufig über Sicherheits-Relaismodule, die als Teil eines Sicherheitsschaltgerätes von dem Sicherheitsschaltgerät oder direkt von einem Signalgeber mit entsprechenden Sicherheitsschaltsignalen angesteuert werden. In vielen Fällen ist es notwendig, dass mit nur einem Sicherheitsschaltsignal eine Vielzahl von Aktuatoren anzusteuern sind, wozu eine entsprechende Vielzahl von Sicherheits-Relais notwendig ist. Da ein Sicherheits-Relais nur eine begrenzte Anzahl von Schaltkontakten und damit das Relaismodul nur eine entsprechend begrenzte Anzahl von Schaltkontaktanschlussklemmen aufweist, ist es notwendig oder gewünscht, eine Kontaktvervielfachung vorzunehmen durch Hinzufügen weiterer Relaismodule. Dann müssen einzelne Verdrahtungen von den Steuerkontaktanschlussklemmen eines ersten Relaismoduls, an das der Signalgeber angeschlossen ist, zu weiteren Relaismodulen, die parallel schalten sollen, geführt werden. Dies ist prinzipiell aus der DE 38 30 742 C2 bekannt. Häufig ist zur Erfüllung der Sicherheitsnormen ein Rückführkreis für EDM vorgesehen, so dass zusätzlich auch noch die Rückführkontakte von Relaismodul zu Relaismodul zu verdrahten sind.The aforementioned actuation of actuators often takes place via safety relay modules, which are controlled as part of a safety switching device by the safety switching device or directly by a signal generator with corresponding safety switching signals. In many cases, it is necessary that a plurality of actuators are to be controlled with only one safety switch signal, for which a corresponding plurality of safety relays is necessary. Since a safety relay only a limited number of switching contacts and thus the relay module has only a correspondingly limited number of switching contact terminals, it is necessary or desirable to make a contact multiplication by adding more relay modules. Then, individual wirings must be routed from the control contact terminals of a first relay module to which the signal generator is connected to other relay modules which are to be connected in parallel. This is in principle from the DE 38 30 742 C2 known. Frequently, a feedback loop for EDM is provided to meet the safety standards, so that in addition the return contacts from relay module to relay module are to be wired.

In Fig. 7 ist eine solche Kontaktvervielfachung nach dem Stand der Technik gezeigt. Die Bezugszeichen sind in dieser Beschreibung so gewählt, dass die Ziffer vor einem Bindestrich die jeweilige Komponente eines Moduls angibt und die Ziffer nach dem Bindestrich das Relaismodul nummeriert. Ein "x" hinter einem Bindestrich dient als Platzhalter für jedes Relaismodul, womit ausgedrückt werden soll, dass eine Bezugnahme erfolgt auf alle gleichartigen Komponenten, unabhängig davon in welchem Modul sie vorhanden sind.In Fig. 7 Such a contact multiplication according to the prior art is shown. The reference numerals in this description are chosen such that the digit in front of a hyphen indicates the respective component of a module and the digit after the hyphen numbers the relay module. An "x" after a hyphen serves as a placeholder for each relay module, meaning that a reference is made to all similar components, regardless of which module they are in.

Die Fig. 7 zeigt ein Blockschaltbild einer Anordnung 10 von zwei Sicherheits-Relaismodulen 12-x, die jeweils zweikanalig aufgebaut sind und zwangsgeführte Relais 16-x, 18-x aufweisen. Jedes Relais weist zwei Steuerkontakte 20-x und 22-x bzw. 24-x und 26-x auf, von denen einer mit einem Massepotenzial verbunden ist. An den anderen Steuerkontakten 22-x bzw. 26-x wird das zweikanalige, eigentliche Sicherheits-Schaltsignal OSSD_1 (erster Kanal) und OSSD_2 (zweiter Kanal) angelegt, das von geeigneten Signalgebern, wie sie oben beschrieben sind, bereitgestellt wird. Jedes Relaismodul weist zwei Schließer 28-x, 30-x und zwei Öffner 32-x, 34-x mit Schaltkontakten 36-x und 38-x sowie 40-x und 42-x auf, wobei die Schließer in Serie geschaltet sind, so dass über die Schließer das 24 V-Rückführsignal zur Gerätekontrolle EDM mittels Rückführkreis Anschlussklemmen 44-x und 46-x geführt ist.The Fig. 7 shows a block diagram of an arrangement 10 of two safety relay modules 12-x, each of which has two channels and positively driven relays 16-x, 18-x have. Each relay has two control contacts 20-x and 22-x or 24-x and 26-x, one of which is connected to a ground potential. At the other control contacts 22-x or 26-x, the two-channel, actual safety switching signal OSSD_1 (first channel) and OSSD_2 (second channel) is provided, which is provided by suitable signal generators, as described above. Each relay module has two make contacts 28-x, 30-x and two openers 32-x, 34-x with switch contacts 36-x and 38-x and 40-x and 42-x, with the make contacts connected in series, see above that the 24 V feedback signal for device control EDM is guided via the make contacts by means of feedback circuit terminals 44-x and 46-x.

Zur Kontaktvervielfachung müssen nun die Steuerkontakte parallel geschaltet werden, indem die Anschlüsse 22-1 und 22-2 sowie 26-1 und 26-2 über gesonderte Leitungen 23 und 25 miteinander zu verbinden sind. Da auch der Rückführkreis durch jedes Relais geführt sein muss, müssen sämtliche Schließer in Serie geschaltet werden, wozu die Anschlüsse 44-1 und 44-2 über eine gesonderte Leitung 45 miteinander verbunden werden müssen und das Rückführsignal von 24 V auf den Anschluss 46-2 umverdrahtet werden muss.For contact multiplication, the control contacts must now be connected in parallel by the terminals 22-1 and 22-2 and 26-1 and 26-2 are to be connected to each other via separate lines 23 and 25. Since the feedback circuit must be guided by each relay, all NO must be connected in series, including the terminals 44-1 and 44-2 must be connected to each other via a separate line 45 and the return signal of 24 V to the terminal 46-2 must be rewired.

Insgesamt bedeutet dies einen sehr hohen Verdrahtungsaufwand, der nicht nur materialaufwändig ist, sondern auch aufgrund möglicher Komplexität ein Sicherheitsrisiko darstellt. Des Weiteren müssen bei einer derartigen Kontaktvervielfachung an einer einzigen Anschlussklemme wenigstens zwei Drähte angeschlossen werden, was nicht nur umständlich in der Handhabung ist, sondern ein weiteres Sicherheitsrisiko darstellt. Die Anschlussklemmen müssen darüber hinaus materialaufwändig so dimensioniert oder ausgebildet sein, dass eine Klemme zwei Drähte aufnehmen kann. Zwei Drähte in einer Klemme zu befestigen kann aber ein Sicherheitsrisiko bedeuten, da zwei Drähte in einer Klemme nie so sicher zu befestigen sind wie nur einer.Overall, this means a very high wiring effort, which is not only material-consuming, but also represents a security risk due to possible complexity. Furthermore, in such a contact multiplication at a single terminal at least two wires must be connected, which is not only cumbersome to use, but represents another security risk. In addition, the connecting terminals must be dimensioned or designed in such a way that they can accommodate two wires. But fixing two wires in a clamp can be a safety hazard since two wires in a clamp are never as secure as just one.

Davon ausgehend ist es Aufgabe der Erfindung, eine kostengünstige und wenig aufwändige, dabei aber flexible Schaltkontaktvervielfachung eines Sicherheits-Relais bereitzustellen, welche dem Anwender eine möglichst hohe Sicherheit bei einfacher Handhabung ermöglicht.On this basis, it is an object of the invention to provide a cost-effective and inexpensive, but flexible switching contact multiplication of a safety relay, which allows the user the highest possible safety with ease of use.

Diese Aufgabe wird gelöst durch eine modulare Anordnung, mit wenigstens zwei Sicherheits-Relaismodulen zum Schalten von Sicherheits-Schaltkontakten, wobei zur Schaltkontaktvervielfachung Steuerkontakte des ersten Relaismoduls mit Steuerkontakten des zweiten Relaismoduls parallel geschaltet sind und jedes Relaismodul das oder die Sicherheits-Relais enthaltende Gehäuse aufweist und entsprechende Steuerkontaktanschlussklemmen und Schaltkontaktanschlussklemmen angeordnet sind. Erfindungsgemäß ist zur Kontaktvervielfachung zusätzlich zu den Klemmen wenigstens ein Kontaktestecker am jeweiligen Sicherheits-Relaismodule zur Verbindung der Steuerkontake der benachbarten zwei Sicherheits-Relaismodule angeordnet. Die Erfindung wird somit auch bereits durch ein Sicherheits-Relaismodul für eine solche modulare Sicherheitssteuerung dargestellt, wobei zur Kontaktvervielfachung zusätzlich zu den vorhandenen Anschlussklemmen für Steuer- und Schaltkontakte wenigstens zwei Kontaktestecker zur Verbindung der Steuerkontakte mit einem benachbarten zweiten Relaismodul angeordnet sind, von deren je einer an beiden Seiten des Gehäuses angeordnet ist.This object is achieved by a modular arrangement, with at least two safety relay modules for switching safety switch contacts, being connected in parallel for switching contact control contacts of the first relay module with control contacts of the second relay module and each relay module containing the safety relay or the housing and corresponding control contact terminals and switching contact terminals are arranged. According to the invention for contact multiplication in addition to the terminals at least one contact plug on the respective safety relay modules for connection of the control contacts of the adjacent two safety relay modules arranged. The invention is thus already represented by a safety relay module for such a modular safety control, wherein for contact multiplication in addition to the existing terminals for control and switching contacts at least two contact plugs for connecting the control contacts with an adjacent second relay module are arranged, one of each is arranged on both sides of the housing.

In diesem Zusammenhang bedeutet der Begriff Kontaktestecker, dass die Verbindung der Steuerkontakte über eine Steckverbindung erfolgt, so dass mit diesem Begriff sowohl ein Steckerteil als auch ein Buchsenteil einer Steckverbindung gemeint sein kann.In this context, the term contact plug means that the connection of the control contacts via a plug connection, so that with this term both a plug part and a socket part of a plug connection may be meant.

Die wesentlichen Vorteile der Erfindung bestehen darin, dass zum einen der Verkabelungsaufwand bei der Kontaktvervielfachung erheblich reduziert ist und zum anderen darin, dass zur Kontaktvervielfachung die Handhabung und damit die Installation erheblich vereinfacht ist, denn es müssen nicht mehr einzelne Drähte von den Klemmen des einen Relaismoduls zu den Klemmen des anderen Relaismoduls mit den vorgenannten Nachteilen verlegt werden, sondern es ist nur der Kontaktestecker zu stecken.The main advantages of the invention are that on the one hand the cabling effort in the contact multiplication is significantly reduced and the other is that the contact multiplication handling and thus the installation is considerably simplified because it no longer individual wires from the terminals of a relay module be moved to the terminals of the other relay module with the aforementioned disadvantages, but it is only the contact plug to plug.

Insgesamt ist die Kontaktvervielfachung mit der Erfindung nicht nur einfacher und sicherer geworden, sondern auch kostengünstiger. Dabei ist die Flexibilität erhalten, nämlich anstelle eines Relaismodul mit einer Vielzahl von Schaltkontakten jetzt mehrere erfindungsgemäße Relaismodule vorzusehen, deren Schaltkontakte je nach Bedarf vervielfacht sind, also wie nur ein Relais mit einer der Anwendung angepassten Anzahl von Schaltkontakten wirken.Overall, the contact multiplication with the invention has not only become simpler and safer, but also cheaper. In this case, the flexibility is obtained, namely instead of a relay module with a plurality of switching contacts now provide several relay modules according to the invention, the switching contacts are multiplied as needed, so how only a relay with an application adapted number of switching contacts act.

Die Erfindung kann mit weiteren Merkmalen fortgebildet werden, wie sie beispielhaft, aber nicht abschließend, in den sich anschließenden Unteransprüchen angegeben sind und zeigt dabei weitere Vorteile.The invention can be developed with further features, as exemplified, but not limited, are given in the appended dependent claims and shows other advantages.

Bevorzugt weist das Sicherheits-Relaismodul einen Rückführkreis (EDM) mit einem Rückführkontakt auf. Bei derartigen Relaismodulen muss bei der Kontaktvervielfachung auch der Rückführkontakt entsprechend korrekt verdrahtet werden, was durch den Kontaktestekker automatisch erfolgen kann, insbesondere wenn auf den Kontaktestecker auch ein Pol des Rückführkontaktes geführt ist.The safety relay module preferably has a feedback circuit (EDM) with a feedback contact. In such Relaismodulen the return contact must be wired according to correct in the contact multiplication, which can be done automatically by the Kontaktestekker, especially when the contact plug and a pole of the return contact is performed.

Die Erfindung zeigt die Vorteile des reduzierten Verdrahtungsaufwands insbesondere dann, wenn das Sicherheits-Relais ein wenigstens zweikanaliges, zwangsgeführtes Relais ist, da sich mit der Anzahl der Relais der Verdrahtungsaufwand ohne die erfindungsgemäße Ausgestaltung entsprechend erhöhen würde.The invention shows the advantages of the reduced wiring complexity, in particular when the safety relay is an at least two-channel, positively driven relay, since the amount of wiring would increase correspondingly with the number of relays without the inventive design.

Wenn der Kontaktestecker seitlich an dem Gehäuse des Relaismoduls angeordnet ist, erfolgt die Kontaktvervielfachung automatisch durch ein Zusammenstecken der Relaismodule zu einer Reihe.If the contact plug is arranged laterally on the housing of the relay module, the contact multiplication is carried out automatically by plugging the relay modules into a row.

Um bei der Kontaktvervielfachung ein zusätzliches Relaismodul sowohl an die linke als auch an die rechte Seite eines schon vorhandenen Relaismoduls stecken zu können, ist an beiden Seiten des Gehäuses ein Kontaktestecker angeordnet.In order to plug in the contact multiplication an additional relay module to both the left and to the right side of an existing relay module, a contact plug is arranged on both sides of the housing.

Der Austausch von Modulen oder die Erweiterung der Modulreihe ist erleichtert, wenn die Module gleichartige Gehäuse aufweisen. Vorzugsweise ist das Gehäuse als Standard IP20 Gehäuse ausgebildet.The replacement of modules or the expansion of the module series is facilitated if the modules have similar housing. Preferably, the housing is designed as a standard IP20 housing.

Die Erfindung wird nachstehend auch hinsichtlich weiterer Merkmale und Vorteile beispielhaft anhand eines Ausführungsbeispiels unter Bezug auf die Zeichnung näher erläutert. In der Zeichnung zeigen:

Fig. 1
eine nicht-erfindungsgemäße Sicherheits-Relaismodul Anordnung;
Fig. 2
schematische Ansicht einen Ausführungsformen der erfindungsgemäßen Anordnung;
Fig. 3
ein Blockschaltbild eines erfindungsgemäßen Sicherheits- Relaismoduls;
Fig. 4
ein Blockschaltbild einer Anordnung zweier zur Kontaktvervielfachung erfindungsgemäß miteinander verbundener Sicherheits-Relaismodule;
Fig. 5
ein Blockschaltbild einer weiteren Ausführungsform;
Fig. 6
ein Blockschaltbild eines Sicherheits-Relaismoduls nach Fig. 3 mit einem angeschlossenen Meldekontakt
Fig. 7
ein Blockschaltbild einer Anordnung von zwei zur Kontaktvervielfachung miteinander verbundener Sicherheits- Relaismodulen nach dem Stand der Technik.
The invention will be explained in more detail below with regard to further features and advantages by way of example with reference to an embodiment with reference to the drawing. In the drawing show:
Fig. 1
a non-inventive safety relay module arrangement;
Fig. 2
schematic view of an embodiment of the inventive arrangement;
Fig. 3
a block diagram of a security relay module according to the invention;
Fig. 4
a block diagram of an arrangement of two according to the invention for contact multiplication interconnected safety relay modules;
Fig. 5
a block diagram of another embodiment;
Fig. 6
a block diagram of a safety relay module after Fig. 3 with a connected signal contact
Fig. 7
a block diagram of an arrangement of two interconnected for contact multiplication safety relay modules according to the prior art.

Fig. 1 zeigt eine Anordnung 110 von zwei Sicherheits-Relaismodulen 112-1 und 112-2, die in der Fig. 1 mit Abstand zueinander dargestellt sind, um die weiter unten erläuterte Verbindung zwischen ihnen darzustellen. Die Bezugsziffern sind mit der gleichen Regelung gewählt, wie oben bereits in Zusammenhang mit dem Stand der Technik (Fig. 7) beschrieben. Fig. 1 shows an arrangement 110 of two security relay modules 112-1 and 112-2, which in the Fig. 1 are shown spaced apart to illustrate the connection between them explained below. The reference numerals are chosen with the same regulation, as already mentioned above in connection with the prior art ( Fig. 7 ).

Die Sicherheits-Relaismodule 112-x weisen ein Gehäuse 114-x auf, sowie Steuerkontaktanschlussklemmen 120-x und 122-x bzw. 126x und Schaltkontaktanschlussklemmen 136-x, 138-x, 140-x und 142-x für jeweils wenigstens ein Sicherheits-Relais, das in der Ansicht nach Fig. 1 nicht erkennbar ist aber weiter unten noch erläutert wird. Des Weiteren sind zwei Anschlussklemmen 144-x und 146-x für einen Rückführkontakt eines Rückführkreises angeordnet.The safety relay modules 112-x have a housing 114-x, and control contact terminals 120-x and 122-x or 126x and switch contact terminals 136-x, 138-x, 140-x and 142-x for at least one safety Relay that in the view Fig. 1 is not recognizable but will be explained below. Furthermore, two terminals 144-x and 146-x are arranged for a return contact of a feedback loop.

Zur Schaltkontaktvervielfachung ist zusätzlich wenigstens ein Kontaktestecker 150-1 am Gehäuse 114-1 angeordnet und am Gehäuse 114-2 ein Kontaktstecker 150-2. Durch Verbinden der Kontaktestecker 150-1 und 151-2 benachbarter Relaismodule werden die Steuerkontakte der benachbarten Relais miteinander verbunden, so dass eine Schaltkontaktvervielfachung gegeben ist, wie weiter unten unter Bezugnahme auf Figur 4 im Detail erläutert ist. Die Kontaktestecker 150-x und 151-x sind in Fig. 1 auf der Frontseite der Gehäuse 114-x angeordnet und über ein Verbindungskabel 152 miteinander verbunden.For switching contact multiplication, at least one contact plug 150-1 is additionally arranged on the housing 114-1, and a contact plug 150-2 on the housing 114-2. By connecting the contact plugs 150-1 and 151-2 of adjacent relay modules, the control contacts of the adjacent relays are connected to each other, so that a switching contact multiplication is given, as explained in detail below with reference to Figure 4. The contact plugs 150-x and 151-x are in Fig. 1 arranged on the front side of the housing 114-x and connected to each other via a connecting cable 152.

Bevorzugt werden über die so erfolgte Verbindung nicht nur die Steuerkontakte miteinander verbunden, sondern auch die Rückführkreise der benachbarten Relaismodule. Die detaillierte Verschaltung wird weiter unten anhand von Blockschaltbildern erläutert.Preferably, not only the control contacts are connected to each other via the connection thus made, but also the return circuits of the adjacent relay modules. The detailed interconnection is explained below using block diagrams.

In einer Ausführungsform der Erfindung sind die Kontaktestecker 150-x und 151-x an beiden Seiten des Gehäuses angeordnet, wobei an der einen Seite des Gehäuses (in der Zeichnung die linke Seite) der Kontaktestecker 151-x als Steckerteil und an der anderen Seite (in der Zeichnung die rechte Seite) als Buchsenteil ausgebildet ist, so dass durch einfaches Zusammenfügen oder Zusammenstecken benachbarter Relaismodule die Kontaktvervielfachung erfolgt.In one embodiment of the invention, the contact plugs 150-x and 151-x are arranged on both sides of the housing, wherein on one side of the housing (in the drawing, the left side) of the contact plug 151-x as a plug part and on the other side ( in the drawing, the right side) is designed as a socket part, so that the contact is multiplied by simply joining or mating adjacent relay modules.

Im Folgenden wird die Kontaktvervielfachung anhand von Blockschaltbildern an einzelnen Ausführungsbeispielen näher erläutertIn the following, the contact multiplication will be explained in more detail by means of block diagrams of individual exemplary embodiments

Fig. 3 zeigt das Blockschaltbild eines ersten Ausführungsbeispiels des Sicherheits-Relaismoduls 112-x mit zwei zwangsgeführten Relais 116-x und 118-x, die über Steuerkontakte 120-x und 122-x bzw. 126-x angesteuert werden. Die Sicherheits-Steuersignale kommen beispielsweise von einem nicht näher dargestellten Signalgeber 200, der zwei redundante Sicherheitssignale OSSD_1 und OSSD_2 liefert. Jedes Relais weist einen Schließer und einen Öffner auf, wobei die Schließer der beiden Relais über eine Verbindungsleitung 119-x in Serie geschaltet sind, um einen Rückführkreis mit Rückführkontakten 144-x in 146-x zur Überprüfung (Electronic Device Monitoring, kurz EDM) des angeschlossenen Signalgebers und der Relais bereitzustellen. In einer nicht dargestellten Ausführungsform können auch mehr als ein Schließer, beispielsweise zwei, einem Relais zugeordnet sein, so dass zwei parallele Schließerpfade gegeben sind. Dann müssen über zwei parallele Verbindungsleitungen die Schließer des einen Relais mit den Schließern des anderen Relais verbunden sein, so dass jeweils zwei Schließer unterschiedlicher Relais in Serie geschaltet sind. Damit sind dann zwei parallele Rückführkreise vorhanden, die beide von jedem Relais gesteuert werden können. Dies ist beispielsweise bei höheren Sicherheitsanforderungen sinnvoll. Fig. 3 shows the block diagram of a first embodiment of the safety relay module 112-x with two positively driven relay 116-x and 118-x, which are controlled via control contacts 120-x and 122-x and 126-x. The safety control signals come, for example, from a signal generator 200, not shown, which supplies two redundant safety signals OSSD_1 and OSSD_2. Each relay has a normally open contact and a normally closed contact, with the normally open contacts of the two relays connected in series via a connection line 119-x, to provide a feedback loop with feedback contacts 144-x in 146-x for checking (Electronic Device Monitoring, abbreviated to EDM) connected signal generator and the relay. In one embodiment, not shown, more than one closer, for example, two, may be assigned to a relay, so that two parallel closer paths are given. Then must be connected via two parallel connecting lines, the normally open one relay to the normally open relay of the other relay, so that in each case two make different relays are connected in series. This then provides two parallel feedback circuits, both of which can be controlled by each relay. This is useful, for example, for higher security requirements.

Zur Schaltkontaktvervielfachung sind von den Schaltkontakten 120-x, 122-x und 126-x Verbindungen auf Kontaktestecker 150-x und 151-x geführt. Ebenso ist der Rückführkontakt 144-x auf den Kontaktestecker 150-x und der Rückführkontakt 146-x auf den Kontaktestekker 151-x geführt.For switching contact multiplication, contacts 120-x, 122-x and 126-x are routed to contact plugs 150-x and 151-x by the switch contacts. Similarly, the return contact 144-x on the contact plug 150-x and the return contact 146-x on the Kontaktestekker 151-x out.

Mit dieser Verschaltung lässt sich in einfacher Weise eine Schaltkontaktvervielfachung erstellen, indem zwei benachbarte Sicherheits-Relaismodule 112-1 und 112-2 über ihre Kontaktestecker 150-1 und 151-2 miteinander verbunden werden, wie dies in Fig. 4 dargestellt ist. Dann sind die Steuerkontakte jeweils entsprechender Relais 116-1 und 116-2 bzw. 118-1 und 118-2 miteinander verbunden. Ebenfalls sind dann die Rückführkreise beider Relaismodule in Serie geschaltet und zur Gerätekontrolle muss lediglich das 24 V Signal für den Rückführkreis umverdrahtet werden von dem Rückführkontakt 144-1 des ersten Relaismoduls 112-1 auf den Rückführkontakt 144-2 des zweiten Relaismoduls 112-2.With this interconnection, switching contact multiplication can be easily established by connecting two adjacent safety relay modules 112-1 and 112-2 via their contact plugs 150-1 and 151-2, as shown in FIG Fig. 4 is shown. Then, the control contacts of respective relays 116-1 and 116-2 and 118-1 and 118-2 are connected to each other. Also then the feedback circuits of both relay modules are connected in series and device control only the 24 V signal for the feedback loop must be rewired from the return contact 144-1 of the first relay module 112-1 on the return contact 144-2 of the second relay module 112-2.

Auf analoge Art und Weise lassen sich erfindungsgemäße Relaismodule zur Kontaktvervielfachung kaskadieren, auch wenn sie einkanalig aufgebaut sind, wie dies in Fig. 5 gezeigt ist. Um auch mit einkanaligen Sicherheits-Relaismodulen eine zweikanalige Abschaltstruktur, wie sie für bestimmte Sicherheitskategorien notwendig ist, bereitstellen zu können, müssen dann zwei geringfügig unterschiedliche einkanalige Sicherheits-Relaismodule 160-x und 162-x bereitgestellt werden. Diese einkanaligen erfindungsgemäßen Sicherheits-Relaismodule unterscheiden sich nur dadurch, dass sie beide jeweils zwei Schaltpfade 164 und 166 aufweisen, wobei einer der Schaltpfade (in Modul 160-x ist dies der Schaltpfad 164 und in Modul 162-x ist dies der Schaltpfad 166) durch das jeweilige Relaismodul direkt von einem Kontaktestecker 171-1 zu dem anderen Kontaktestecker 170-1 geführt ist und der andere Schaltpfad den jeweiligen Schaltkontakt 122-1 bzw. 126-1 umfasst. Auf diese Weise sind jeweils entsprechende Relaismodule 160-1 und 160-2 sowie 162-1 und 162-2 miteinander verbunden, was die Schaltpfade angeht, so dass die Relais 160-1 und 160-2, wie auch die Sicherheits-Relais 162-1 und 162-2, gleichzeitig schalten.In an analogous manner can be inventive Cascade relay modules for contact multiplication, even if they are single-channel, as in Fig. 5 is shown. In order to be able to provide a dual-channel switch-off structure, which is necessary for certain security categories, even with single-channel safety relay modules, then two slightly different single-channel safety relay modules 160-x and 162-x must be provided. These single-channel safety relay modules according to the invention differ only in that they each have two switching paths 164 and 166, whereby one of the switching paths (in module 160-x this is the switching path 164 and in module 162-x this is the switching path 166) the respective relay module is guided directly from one contact plug 171-1 to the other contact plug 170-1 and the other switching path comprises the respective switching contact 122-1 or 126-1. In this way, respective relay modules 160-1 and 160-2 as well as 162-1 and 162-2 are interconnected with respect to the switching paths, so that the relays 160-1 and 160-2, as well as the safety relays 162- 1 and 162-2, switch simultaneously.

An ein erfindungsgemäßes Sicherheits-Relaismodul 112-x lässt sich auch ein einfacher Meldekontakt 180 über die Kontaktestecker anschließen, wie in Fig. 6 dargestellt, wobei ein einfacher Meldekontakt keine Rückführung benötigt und deswegen eine entsprechende Bypassleitung 184 von Kontaktestecker 191 zu dem anderen Kontaktestecker 190 geführt ist. Je nachdem ob der Schaltkontakt 182 mit der Leitung 186 oder 188 verbunden ist, spricht der Meldekontakt auf das OSSD_1 oder OSSD_2 Signal an.A simple signaling contact 180 can also be connected via the contact plug to a safety relay module 112-x according to the invention, as in FIG Fig. 6 shown, with a simple signal contact no feedback required and therefore a corresponding bypass line 184 is guided by contact plug 191 to the other contact plug 190. Depending on whether the switch contact 182 is connected to the line 186 or 188, the signaling contact responds to the OSSD_1 or OSSD_2 signal.

Jedes Modul kann in einem gleichartigen Gehäuse untergebracht sein. Das Gehäuse kann dabei ein IP20-Gehäusesystem sein. Alternativ kann je nach Anforderung das Gehäuse auch in einer höheren Schutzklasse wie beispielsweise IP65 ausgeführt sein.Each module can be housed in a similar housing. The housing can be an IP20 housing system. Alternatively, depending on the requirements, the housing may also be designed in a higher protection class, such as, for example, IP65.

Claims (6)

  1. An arrangement (110) having at least two safety relay modules (112-1, 112-2) for the switching of safety switch contacts, wherein control contacts of the first relay module are connected in parallel to control contacts of the second relay module for the multiplication of switch contacts and each relay module has a housing (114-x) including the safety relay and control contact connection terminals (120-x, 122-x, 126-x) and switch contact connection terminals (136-x, 138-x, 140-x, 142-x) are arranged, charaterised in that at least two contact plugs (150-x, 151-x) are additionally arranged at the respective safety relay module (112-1, 112-2) for the multiplication of switch contacts for the connection of the control contacts of the adjacent two safety relay modules, a contact plug is arranged at both sides of the housing.
  2. A safety relay module for a modular arrangement (110) in accordance with claim 1 having a housing (114-1) including at least one safety relay and having control contact connection terminals (120-x, 122-x, 126-x) and switch contact connection terminals (136-x, 138-x, 140-x, 142-x), characterised in that at least two contact plugs (150-x, 151-x) for the connection of the control contacts to an adjacent second relay module are additionally arranged for the multiplication of switch contacts, a contact plug is arranged at both sides of the housing.
  3. A safety relay module in accordance with claim 2, characterised in that the relay module has a feedback loop (EDM) having a feedback contact.
  4. A safety relay module in accordance with claim 3, characterised in that a pole of the feedback contact is also guided on the contact plug.
  5. A safety relay module in accordance with any one of the preceding claims, characterised in that the safety relay is an at least two-channel, force guided relay.
  6. An arrangement of safety relay modules in accordance with any one of the preceding claims, characterised in that the housings of the modules are designed in the same manner, in particular as standardised housings, for example in accordance with protection class IP20.
EP08102402.8A 2008-03-07 2008-03-07 Modular safety control and safety relay module Active EP2099048B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE502008000712T DE502008000712D1 (en) 2008-03-07 2008-03-07 Modular safety control and safety relay module
AT08102402T ATE469432T1 (en) 2008-03-07 2008-03-07 MODULAR SAFETY CONTROL AND SAFETY RELAY MODULE
EP08102402.8A EP2099048B2 (en) 2008-03-07 2008-03-07 Modular safety control and safety relay module

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Application Number Priority Date Filing Date Title
EP08102402.8A EP2099048B2 (en) 2008-03-07 2008-03-07 Modular safety control and safety relay module

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EP2099048A1 EP2099048A1 (en) 2009-09-09
EP2099048B1 EP2099048B1 (en) 2010-05-26
EP2099048B2 true EP2099048B2 (en) 2019-03-06

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US11137727B2 (en) 2019-04-04 2021-10-05 Swivel-Link, LLC Validation device for testing a machinery safety system

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DE3830742A1 (en) * 1988-09-09 1990-03-22 Elan Schaltelemente Gmbh Safety circuit
DE10045651B4 (en) * 2000-09-15 2007-08-02 Pilz Gmbh & Co. Kg Safety relay

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