EP3799669B1 - Device for protecting data lines from overvoltages - Google Patents

Description

The invention relates to a device for protecting data lines against overvoltages, with a lower part for accommodating an upper part with overvoltage protection parts, the upper part for a pluggable connection with a lower part, an electronic monitoring unit that detects whether an upper part is plugged in, and in the event that an upper part is plugged in, in the event that no upper part is plugged in, and in the event that at least one overvoltage protection part of the plugged in upper part is defective, a corresponding signal is emitted by the monitoring unit, a bus system with several bus lines which are connected to a voltage source and at least to the monitoring unit are, wherein a signaling unit is also connected, which displays the signal of the monitoring unit and / or leads to a remote signaling.

Such a device is, for example, from EP 2745179 B1 famous. In the case of the known device, it is considered disadvantageous that the electronic monitoring device is arranged in the lower part, called the base element there, and is connected accordingly. This has the consequence that in the realization of the known embodiment, the usual lower parts can not be used, but with new lower parts Monitoring device must be replaced. This results in considerable assembly work, because when the device is installed, a new lower part has to be installed, which has to be wired accordingly. Furthermore, this results in higher costs because the previous lower parts cannot be used and new lower parts have to be made available.

From the EP 2922146 A1 a similar device is known. It is true that components of the electronic monitoring unit are formed in the pluggable upper parts. Nevertheless, it is necessary to provide new bases if such a device is to be installed because the bases that match the tops have a different configuration than conventional bases, since additional plug contact elements must be provided and wired in the bases that contact the associated tops Need to become.

This also means that when such a device is installed, the previously customary lower parts cannot continue to be used, but rather new lower parts have to be installed, which in turn leads to higher costs and assembly work.

Proceeding from this state of the art, the object of the invention is to provide a device of the generic type in which the lower parts of previously customary devices can continue to be used, even if such devices are equipped with an electronic monitoring device are to be equipped. In particular, it is to be achieved that the cabling effort is kept low when converting to electronic monitoring units, the storage is minimized, since previous lower parts can continue to be used and can also be used in new installations and thus the cost is minimized.

An enrichment of the state of the art is also to be achieved.

To solve this problem, the invention proposes that the electronic monitoring unit is arranged in a bus connector that communicates with the bus system and a monitoring and evaluation unit that is coupled to the upper part.

As a result of this configuration, it is not necessary during installation that previously customary lower parts are replaced by other lower parts, but the previous lower parts can remain in the installation. The previous sub-parts, which do not include any special electronic monitoring units, can also be installed with the new installation, so that the installation effort is minimized during the subsequent installation, since no new sub-parts have to be installed and a cost advantage is achieved with the new installation, since it does not matter whether devices with Monitoring unit or are to be installed without a monitoring unit, the same lower parts can be used, which minimizes storage and thus costs.

This is achieved in that the electronic monitoring unit is arranged in an additional element, namely a bus connector, which communicates with the bus system and a monitoring and evaluation unit. This monitoring and evaluation unit is coupled to the upper part. When retrofitting existing devices that are to be equipped with a corresponding monitoring unit, it is only necessary to install the bus connector with the electronic monitoring unit next to the conventional lower parts and to insert the corresponding new upper part, which is coupled to the monitoring and evaluation unit. this upper part with these components is then connected to the monitoring unit, which is arranged in the bus connector, in the plugged-in position and thus performs the corresponding functions.

It is particularly preferred that the lower part has several connection terminals 1 to 4 for data lines, shield connection S for electrical shielding, earth connection PE, with associated connection terminals being connected by electrical conductors below the lower part and these conductors having first connection plug-in contacts for the upper part is conductively connected, which upper part has the overvoltage protection parts, at least one gas arrester and/or a transient voltage protection diode, which are conductively connected to suitable second connection plug contacts, with the upper part being pluggable with the lower part or is plugged in and in the plugged-in position, the first and second connection plug-in contacts interlock, the lower part is combined with the bus connector, which has bus lines running in a plane below the lower part, each ending in plug-socket connectors, which has a body protruding from the bus lines , in which the electronic monitoring unit is installed, which is contacted with at least some bus lines, and which has connecting lines which are contacted with the bus lines and which are contacted in plug-in contacts on a plug-in side, the upper part is wirelessly coupled to a signaling device for the upper part, which is connected to the Evaluation unit is combined, the signaling device together with the evaluation unit being contacted or contactable via plug-in contacts with the plug-in contacts of the bus connector, and as a voltage source a power pack to a device consisting of at least one lower part and one upper part, and a Bu sverbinder can be lined up, which can be plugged into the bus lines of the bus connector.

As a result, simple installation and also simple retrofitting of existing systems with conventional subparts is possible and realizable.

In a manner known per se, it is also provided that at least the lower part can be snapped onto a mounting rail, or also the bus connector and/or the voltage source (power pack) and that the bus lines are routed in a recess in the mounting rail.

A preferred development is also seen in the fact that the upper part is translucent at least in the area where the overvoltage protection parts, preferably the gas arrester, are arranged, that the electronic monitoring and evaluation unit is adapted to this area or covers this area, so that overvoltage events in the gas arrester can be optically detected and can be processed in the evaluation unit, the evaluation unit having an externally visible electrical optical display which indicates the correct function of the gas discharge tube and its error signal.

The electronic monitoring and evaluation unit is adapted to the upper part. This means that these two parts can form a functional unit or also a physical unit, or can also be attached to one another in a suitable manner. Photodiodes, for example, can be located in the adapted monitoring and evaluation unit, which can optically detect corresponding overvoltage events of the gas discharge tube. These can be recorded and evaluated in the electronic evaluation unit and used to trigger a display. For example, the evaluation unit can have an electrical optical display visible from the outside, which normally lights up green and switches to red in the event of an error signal, so that the user can immediately see that there is an error.

It is preferably provided that the electrical optical display visible from the outside has the shape of a backlit arrow and on which in Mounting position exposed end face of the evaluation unit is formed, wherein the arrowhead is directed towards the monitored upper part.

This arrangement and alignment means that the optical display fed by the supply voltage points in the form of an arrow or a triangle to the corresponding upper part to which the monitoring and evaluation unit is adapted, so that with a large number of Devices for the user is easily recognizable which element is defective.

Furthermore, it is preferably provided that the electronic evaluation and monitoring unit records and evaluates the overvoltage events with regard to intensity and duration, with the visual display changing to a corresponding one if the sum of all overvoltage events detected exceeds a permissible limit value of the overvoltage protection part, in particular the gas arrester Error mode is switched and the error signal of the overvoltage unit of the bus connector is switched to error mode.

The intensity and duration of the flash of light generated by the gas discharge tube is recorded, stored and evaluated in the electronic evaluation unit. The sum of the detected overvoltage events is compared electronically with a limit value. If the sum exceeds the permissible limit value that is matched to the gas discharge tube, the visual display is switched to error mode, for example to red and the error signal of the bus connector is also switched to error mode, so that remote signaling can take place via this.

Provision is also preferably made for the bus system to have six bus lines, for example, namely a line for the supply voltage -plus-, a line for the supply voltage -minus-(ground)-, a line for an error signal (FS), a line for data (+) (A), one line for data (-) (B), one line for signal ground (GND).

Instead of six bus lines, more or fewer bus lines can also be installed as required.

In addition, it is preferably provided that a power supply unit is arranged as the voltage source, which is designed to supply several upper parts with a monitoring and evaluation unit via the bus connector, the power supply unit preferably having a status display device for the OK status of all connected upper parts and for Defective or defective condition of an upper part.

Such a power pack can, for example, ensure the supply of up to 30 overvoltage protection devices via the bus connector, with the status display device being able to record and display the status of the connected upper parts at the same time.

Provision is particularly preferably made for the power pack to have connection terminals for connecting a voltage source with preferably 10 volts to 30 volts direct voltage or 5 volts via a USB connector.

The power pack preferably has a USB interface, for example in the form of a USB mini socket, which is advantageously placed on the upper housing. With the help of host software (PC, PLC), the number of overvoltage events can be transmitted from all electronic overvoltage counters to the host (PC, PLC). Advantageously, the system can also be supplied with power via a USB cable, provided that the USB host system can provide sufficient power for all pluggable data line protection shells with optical signaling. Connecting the supply voltage via a simple USB cable is also quicker than conventional wiring from a power pack to the power pack's connection terminals.

It can also be provided that the voltage source, in particular the power pack, has a remote signaling device (relay) for remote signaling to a remote receiving and monitoring center.

In addition, it is preferably provided that the electronic monitoring unit has a transistor switch, in particular an FET and/or bipolar transistor.

Provision can also preferably be made for a plurality of bus connectors to be able to be plugged in in a series arrangement.

An embodiment of the invention is shown in the drawing and described in more detail below.

Figur 1

eine Ansicht von Vorrichtungen zum Schutz von Datenleitungen gegen Überspannungen;

Figur 2

ein Unterteil in Ansicht;

Figur 3

desgleichen in Draufsicht von oben gesehen;

Figur 4

desgleichen von der einen Stirnseite her gesehen;

Figur 5

desgleichen von der anderen Stirnseite her gesehen;

Figur 6

ein Oberteil mit adaptierter Überwachungs- und Auswerteeinheit in Ansicht;

Figur 7

desgleichen von einer Stirnseite her gesehen;

Figur 8

desgleichen in Draufsicht gesehen;

Figur 9

einen Busverbinder in einer Ansicht;

Figur 10

den Busverbinder aus der anderen Ansichtsrichtung gesehen;

Figur 11

den Busverbinder in einer Stirnansicht;

Figur 12

den Busverbinder in Draufsicht gesehen;

Figur 13

ein Netzteil in Ansicht;

Figur 14

desgleichen in Draufsicht von oben gesehen;

Figur 15

das Netzteil in einer Stirnansicht;

Figur 16

das Netzteil in der anderen Stirnansicht;

Figur 17

einen Schaltplan von Unterteil, Oberteil mit optischer Signalisierung und Überwachungs- und Auswerteeinheit sowie mit Busverbinder;

Figur 18

das zugehörige Netzteil.

It shows:

figure 1

a view of devices for protecting data lines against overvoltages;

figure 2

a lower part in view;

figure 3

likewise seen in plan view from above;

figure 4

likewise seen from one end;

figure 5

likewise seen from the other end;

figure 6

an upper part with an adapted monitoring and evaluation unit in view;

figure 7

likewise seen from a front side;

figure 8

likewise seen in top view;

figure 9

a bus connector in a view;

figure 10

the bus connector seen from the other viewing direction;

figure 11

the bus connector in an end view;

figure 12

seen the bus connector in plan view;

figure 13

a power pack in view;

figure 14

likewise seen in plan view from above;

figure 15

the power pack in a front view;

figure 16

the power pack in the other end view;

figure 17

a circuit diagram of the lower part, upper part with optical signaling and monitoring and evaluation unit and with bus connector;

figure 18

the associated power supply.

The figures show a device for protecting data lines against overvoltages with a lower part 1 for pluggable accommodation of an upper part 2, which contains overvoltage protection elements.

An electronic monitoring unit is provided in the device, which detects whether an upper part 2 is inserted. If an upper part 2 is plugged in, a positive signal is generated. In the event that no upper part 2 is inserted and also in the event that at least one overvoltage protection part of the inserted upper part 2 is defective, a corresponding negative signal is emitted by the monitoring unit. A bus system with a plurality of bus lines is also provided, which are connected to a voltage source and at least to the monitoring unit, with a signaling unit also being connected, which displays the signal from the monitoring unit and/or routes it to remote signaling.

The electronic monitoring unit 3 is installed in a bus connector 4 which communicates with the bus system 5 and a monitoring and evaluation unit 6 . The monitoring and evaluation unit 6 is coupled to the upper part 2 . The coupling can take place, for example, in such a way that both are arranged in a common housing. However, the coupling can also take place in such a way that the housing of the electronic monitoring and evaluation unit 6 is connected laterally to the housing of the upper part 2 and fastened thereto.

In particular, the lower part 1 has a number of connection terminals 1 to 4 for data lines, shield connection terminals S for electrical shielding and the ground connection GND. The associated terminals are connected by electrical conductors within the base 1 and this Heads are in conductive connection with the first connector plug contacts 7 for the upper part 2 . The upper part 2 has the overvoltage protection parts, at least one gas discharge tube and a transient voltage protection diode, these being conductively connected to matching second plug-in connector contacts 8 . The upper part 2 can be plugged into the lower part 1 in a corresponding manner, with the first and second connector plug contacts 7, 8 being connected in a contact-making manner in the plugged-in position.

The lower part 1 is combined with the bus connector 4, which has bus lines running in a plane below the lower part 1, which end in plug-socket connectors 9, 10, respectively. The bus connector 4 has a body 11 protruding from the preformed bus lines, in which the electronic monitoring unit 3 is installed, which is contacted with at least some bus lines/connectors. Furthermore, the bus connector 4 has connecting lines which are in contact with the bus lines and are in contact with plug-in contacts 12 on a plug-in side. The upper part 2 is wirelessly coupled to a signaling device 13 for the upper part 2 which is combined with the monitoring and evaluation unit 6 . The signaling device 13 together with the evaluation unit 6 is in contact with the plug contacts 12 of the bus connector 4 in the functional position via connection contacts 14 . As a voltage source, a power pack 15 can be stacked on a device that consists of at least one lower part 1 and one upper part 2 and has a bus connector 4, with the corresponding plug-socket connector 9, 10 of the bus connector 4 the connection to other bus connectors or the connection to the power pack 15 is established, which has corresponding plug connectors 16 .

As shown in the exemplary embodiment, the lower part 1 can be snapped onto a mounting rail 17 . The bus connector 4 and the voltage source in the form of the power supply unit 15 can also be snapped onto this, with the plug-socket connectors forming the bus lines being guided in a depression in the mounting rail 17 .

The upper part 2 is translucent at least in the area where the overvoltage protection parts, in particular the gas arrester, are arranged, with the electronic monitoring and evaluation unit 6 being adapted to this area or covering this area, so that overvoltage events made visible by the gas arrester are optically separated from the monitoring - And evaluation unit 6 can be detected and processed. The evaluation unit also has the externally visible electrical optical display 13, which indicates either the correct functioning of the overvoltage elements, in particular the gas arrester, or its error signal.

Preferably, the externally visible (preferably from above) electrical optical display 13 is in the form of a backlit arrow, with the arrowhead pointing towards the monitored upper part 2 so that the user can clearly see which upper part 2 the display is assigned to.

The electronic monitoring and evaluation unit 6 evaluates the overvoltage events with regard to their Intensity and its duration by then, if the sum of all detected overvoltage events exceeds a stored permissible limit value of the overvoltage protection part, in particular the gas arrester, the optical display 13 is switched to a corresponding error mode and the error signal of the bus connector 4 (the electronic monitoring unit 3 located therein) switched to error mode.

The bus system 5 has, for example, 6 bus lines, namely a line for the "plus" supply voltage, a line for the "minus" (ground) supply voltage, a line for an error signal FS, a line for data (+)A, a line for data (-)B and a line for signal ground (GND).

The power supply unit 15 is arranged as the voltage source and is designed to supply several upper parts 2 with a monitoring and evaluation unit 6 via the bus connector 4, with the power supply unit 15 preferably having a status display device 18 for the OK status of all connected upper parts 2 and for a defect status or Faulty state of an upper part 2 has.

The power pack 15 also preferably has connection terminals ++ and -- for connecting a voltage source with preferably 10 to 30 volts DC voltage or a connection socket 19 for a USB connector via which a voltage of 5 volts, for example, can be fed. In addition, the voltage source, in particular the power pack 15, has a remote signaling device (relay) for remote signaling to a remote receiving and monitoring center. The electronic monitoring unit 3 preferably has a transistor switch, in particular an FET and/or a bipolar transistor. As already in figure 1 shown, the arrangement of several lower parts 1, upper parts 2 and bus connectors 4 is provided on a corresponding support rail, the correspondingly arranged bus connectors 4 being plug-connected to one another in the installation arrangement.

In figures 17 and 18 a circuit diagram is given which explains the electrical components and their wiring. The legend, which is part of the description, defines the individual items. The circuit diagram has no limiting function, but only serves to explain the invention.

Of course, the invention is not limited to the exemplary embodiment, but is variable in many ways within the scope of the disclosure.

PDP-UP-OS

Steckbarer Datenleitungsschutz Oberteil mitoptischer Signalisierung

PDP-BP

Steckbarer Datenleitungsschutz Unterteil

PDP-BC

Steckbarer Datenleitungsschutz Busverbinder

PDP-PS

Steckbarer Datenleitungsschutz Netzteil

DEV

zu schützendes Gerät

CAB

Leitung 2- oder 4- polig mit Schirm

TS(PE)

Tragschiene geerdet

PE2

Alternative Erde über Anschlussklemme

TSK

Tragschienenkontakt

GDT

Gasableiter (3- polig)

GDT2

Gasableiter (2- polig)

TVS

Transienten- Spannungs- Schutz- Diode

R

Entkopplungselement (Widerstand, Induktivität, TBU)

T

Transistorschalter (Schalter, FET, Bipol.-Transistor)

PD

Photodiode zur Detektion von Lichtimpulsenim GDT

µC

Mikrokontroller

LED

Leuchtdiode (rot+grün oder mehrfarbig)

K

Relais

DC/DC

DC/DC- Wandler

USB

USB- Buchse

1

Anschlussklemme für 1. Datensignal (ungeschützt)

2

Anschlussklemme für 2. Datensignal (ungeschützt)

3

Anschlussklemme für 3. Datensignal (ungeschützt)

4

Anschlussklemme für 4. Datensignal (ungeschützt)

1'

Anschlussklemme für 1. Datensignal (geschützt)

2'

Anschlussklemme für 2. Datensignal (geschützt)

3'

Anschlussklemme für 3. Datensignal (geschützt)

4'

Anschlussklemme für 4. Datensignal (geschützt)

S

Anschlussklemme für Schirmleiter (ungeschützt)

PE

Anschlussklemme für Schutzerde

+

Anschlussklemme für Spannungsversorgung

+10-

30V

-

Anschlussklemme für Spannungsversorgung GND

11

Anschlussklemme für Fernsignalisierung COM(Pol)

12

Anschlussklemme für Fernsignalisierung NC (Öffner)

14

Anschlussklemme für Fernsignalisierung NO (Schließer)

+5V

Spannungsversorgung +5V

GND

Spannungsversorgung GND

FS

Fehler Signal

DT

Detektion Signal

A

Datenschnittstelle A+

B

Datenschnittstelle B-

_·_·_

Lichtimpuls von GDT zur PD

Legend

PDP UP OS

Pluggable data line protection upper part with optical signalling

PDP BP

Pluggable data line protection lower part

PDP BC

Pluggable data line protection bus connector

PDP PS

Pluggable data line protection power pack

DEV

device to be protected

cab

2- or 4-pole cable with shield

TS(PE)

DIN rail grounded

PE2

Alternate ground via terminal block

TSK

mounting rail contact

GDT

Gas discharge tube (3-pin)

GDT2

Gas discharge tube (2-pin)

TVS

Transient voltage protection diode

R

Decoupling element (resistance, inductance, TBU)

T

Transistor switch (switch, FET, bipolar transistor)

PD

Photodiode for detecting light pulses in the GDT

µC

microcontroller

LEDs

LED (red+green or multicolored)

K

relay

DC/DC

DC/DC converter

USB

USB port

1

Connection terminal for 1st data signal (unprotected)

2

Connection terminal for 2nd data signal (unprotected)

3

Connection terminal for 3rd data signal (unprotected)

4

Connection terminal for 4th data signal (unprotected)

1'

Connection terminal for 1st data signal (protected)

2'

Connection terminal for 2nd data signal (protected)

3'

Connection terminal for 3rd data signal (protected)

4'

Connection terminal for 4th data signal (protected)

S

Connection terminal for shield conductor (unprotected)

PE

Connection terminal for protective earth

+

Connection terminal for power supply

+10-

30V

-

Connection terminal for power supply GND

11

Connection terminal for remote signaling COM(pole)

12

Connection terminal for remote signaling NC (opener)

14

Terminal for remote signaling NO (closer)

+5V

Power supply +5V

GND

Power supply GND

FS

error signal

DT

detection signal

A

Data interface A+

B

data interface B

_ _ _

Light pulse from GDT to PD

Claims (12)

1. An overvoltage protection device for data lines comprising a base portion (1) for receiving a top portion (2) with overvoltage protection parts, the top portion (2) for the pluggable connection to a base portion (1), an electronic monitoring unit (3) that detects whether a top portion (2) is inserted, in the case that a top portion (2) is inserted, in the case that no top portion (2) is inserted, and in the case that at least one overvoltage protection part of the plugged-in top portion (2) is defective, a corresponding signal is issued by the monitoring unit (3), a bus system (5) with several bus lines connected to a voltage source and at least to the monitoring unit (3), further a signaling unit (13) being connected that indicates the signal of the monitoring unit and/or conducts it to a remote signaling unit, characterized by that the electronic monitoring unit (3) is arranged in a bus connector (4) communicating with the bus system (5) and a monitoring and evaluating unit (6) that is coupled to the top portion (2).
2. The device of claim 1, characterized by that the base portion (1) includes several connection terminals 1 to 4 for data lines, a shield terminal S for an electrical shield, an earth terminal PE, the respective connection terminals being connected by electrical conductors underneath the base portion (1), and these conductors being in conductive connection to first plug contact elements (7) for the top portion (2), which top portion (2) includes the overvoltage protection parts, at least one gas arrester and/or a transient voltage protection diode, which are conductively connected to matching second plug contact elements (8), the top portion (2) being pluggable or plugged on the base portion (1), and in the plugged position, the first and second plug contact elements (7, 8) engage with each other in a contacting manner, the base portion (1) is combined with the bus connector (4) including bus lines extending in a plane underneath the base portion (1) and respectively terminating in male-female connectors (9, 10), which comprises a body (11) protruding from the bus lines, in which the electronic monitoring unit (3) is installed, which is contacted with at least several bus lines, and includes connection lines contacted with the bus lines, said connection lines being contacted in plug contacts (12) at a plug face, the top portion (2) is wirelessly coupled to a signaling device (13) for the top portion (2), said signaling device being combined with the evaluating unit (6), the signaling device (13) together with the evaluating unit (6) being contacted or contactable through terminal plug contacts (14) with the plug contacts (12) of the bus connector (4), and a power supply (15) as a voltage source is stackable at a device comprising at least one base portion (1) and one top portion (2), and a bus connector (4), which can be plugged on the bus lines of the bus connector (4).
3. The device of one of claims 1 or 2, characterized by that at least the base portion (1) can be snap-fitted on a support rail (17), or also, in addition, the bus connector (4) and/or the voltage source (power supply (15)), and that the bus lines are guided in a recess of the support rail (17).
4. The device of one of claims 1 to 3, characterized by that the top portion (2) is light-transmittable at least in the region of the arrangement of the overvoltage protection parts, preferably of the gas arrester, that the electronic monitoring and evaluating unit (6) is adapted at this region or covers this region so that overvoltage events can optically be detected in the gas arrester and processed in the evaluating unit (6), the evaluating unit (6) including an electrical optical display (13) visible from outside and indicating the correct function of the gas arrester and the error signal thereof.
5. The device of claim 4, characterized by that the electrical optical display (13) visible from outside has the shape of a backlighted arrow and is formed at the front side of the evaluating unit (6) being exposed in the mounting position, the tip of the arrow being directed towards the monitored top portion (2).
6. The device of one of claims 1 to 5, characterized by that the electronic evaluating and monitoring unit (6) detects the overvoltage events with regard to intensity and duration and evaluates them, and when the sum of all detected overvoltage events exceeds an admissible limit value of the overvoltage protection part, in particular of the gas arrester, then the optical display (13) is switched into a corresponding error mode, and the error signal of the monitoring unit (3) of the bus connector (4) is switched to error mode.
7. The device of one of claims 1 to 6, characterized by that the bus system includes, for instance, six bus lines, namely a line for supply voltage -plus- , a line for supply voltage -minus-(ground)-, a line for an error signal (FS), a line for data (+) (A), a line for data (-) (B), and a line for signal ground (GND).
8. The device of one of claims 1 to 7, characterized by that a power supply (15) is provided as a voltage source that is designed for the supply of several top portions (2) with monitoring and evaluating unit (6) through the bus connector (4), the power supply (15) preferably including a state display device (18) for an OK state of all connected top portions (2) and for a defect state or error state of a top portion (2).
9. The device of claim 8, characterized by that the power supply (15) includes connection terminals (++ and --) for the connection of a voltage source with preferably 10 to 30 volts DC or 5 volts via a USB plug connector.
10. The device of one of claims 1 to 9, characterized by that the voltage source, in particular the power supply (15), includes a remote message device (relay) for remote signaling to a remote reception and monitoring center.
11. The device of one of claims 1 to 10, characterized by that the electronic monitoring unit (3) includes a transistor switch, in particular an FET and/or bipolar transistor.
12. The device of one of claims 1 to 11, characterized by that several bus connectors (4) can be connected by plugging in a series arrangement.

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