DE102010052080B4 - Signaling system and method for operating such - Google Patents

Abstract

Signaling system, in particular intercom, comprising - a first signal station (8), a second signal station (8) and at least one third signal station (8), - a bus system (2) via which the first signal station (8), the second signal station (8 ) and the at least one third signal station (8) for communicating communication signals are connected to each other and with which they form a communication network, and - a voltage source (14), characterized by at least one first strand separator (10) - in the bus system (2) between the voltage source (14) and the first signal station (8) is arranged, - a switching element (34, 40, 56) which in a transmission position, in which the communication signals are sent to the first signal station (8), and in a Error position can be brought, in which a test signal to the first signal station (8) is passed, - comprises an error detection device, with a malfunction in the Kommunikati Onsnetzwerk is detected when the switching element (34, 40, 56) is in the forward position, and with a malfunction in a part of the communication system is detectable, which faces from the at least one strand separator (10) from the first signal station (8) is when the switching element (34, 40, 56) is in the error position.

Description

The invention relates to a house signal system, in particular an intercom, with a first signal station, a second signal station and at least one third signal station, a bus system via which the first signal station, the second signal station and the at least one third signal station for the transmission of communication signals are connected to each other and with which they form a communication network, and a voltage source.

The invention also relates to a method for operating such a house signal system.

From the DE 195 48 744 C5 is a generic signal system known. In addition to the traditional function as a doorbell, such a house signal system can be equipped, for example, with an intercom system or with the possibility of transmitting video signals. However, a house signal system can also be an in-house communication device with a plurality of connected telephones or video telephones. The first signal station, the second signal station and the third signal station, for example, identical terminals, which may be, for example, in each apartment of a multi-party house. Also arranged in this case at the front door of the multi-party house door station would be one of the signal stations in this case. All these signal stations are connected to each other via a bus system and can communicate with each other. The bus system and the signal stations connected thereto together form a communication network that is part of the house signal system. A voltage source supplies the communication network with the required electrical energy.

Conventionally, all signal stations are connected in parallel to a bus system. If a malfunction occurs here, for example a short circuit in one of the signal stations, this local short circuit renders the entire communication network inoperative. This is particularly disadvantageous if danger messages, alarms or calls for help are to be sent via this network and via the bus system contained therein. In modern signal systems, the functionality of a hazard alarm is often integrated into a door entry system.

In various countries, legal regulations have now been made that regulate the function maintenance and functionality of such a system, for example, in the event of fire or in other hazardous situations. It is provided that faulty system components are separated from the rest of the signal system of the house, so that this remaining portion remains functional. This is desirable not only in case of danger, but also for example in intercom systems in large apartment blocks or large internal communication systems. In a house signal system according to the prior art, the complete door intercom system would be disabled if only one terminal, so one of the connected signal stations, has a malfunction. In this case, it is easy to see that there is a fault because the system is out of service, but the fault can be difficult to localize, so that the repair is time-consuming and thus cost-intensive.

From the US 2005/0049754 A1 a network for a building technology is known in which different devices and signal stations are arranged in CAN network loops. These CAN loops are connected to each other via a different kind of network, for example an Ethernet. The interface used is so-called bridges, which enable network communication between the different network types. If several of these bridges are used redundantly, it is possible to distinguish between malfunctions of the respective device and interruptions of individual network strands within the CAN loops.

From the DE 103 24 437 A1 a CAN bus system is known in which individual CAN participants are fully galvanic decoupled from the CAN bus system, so that they are only connected via a common ground connection to the network.

The WO 01/92 045 A2 discloses a method for handling a faulty device in a vehicle communications network. Test signals are sent to the device to be tested. From the response of the device to these test signals, the functional state and possibly also the nature of an error that has occurred can be determined and treated accordingly.

From the DE 295 09 258 U1 An intercom is known in which a CAN fieldbus is used.

The invention is therefore based on the object to further develop a generic house signal system so that in case of malfunction in a part of the house signal this erroneous share of the communication from the rest of the system is separated and this remaining proportion is maintained functional.

The invention solves this problem by a generic house signal system, which is characterized by at least one first strand separator, which is arranged in the bus system between the voltage source and the first signal station, a switching element which in a passage position in which the communication signals to the first signal station and can be brought into an error position, in which a test signal is passed to the first signal station, and which comprises an error detection device with which a malfunction in the communication network is detectable when the switching element is in the forward position, and with the one Malfunction is detectable in a part of the communication system, which faces from the at least one first strand separator of the first signal station, when the switching element is in the error position.

The fault detection device of a house signal system according to the invention monitors permanently or at regular intervals the functionality of the communication network. If, for example, a malfunction occurs in one of the connected signal stations, for example a short circuit, this can be detected in the entire communication network. Once the fault detection device has detected such a malfunction, the switching element is brought from a forward position, which allows the communication of the first signal station with the rest of the communication network, in the error position. In this error position, it is possible for the error detection device to check whether the determined malfunction is present in that part of the communication system which, viewed from the one strand separator, faces the first signal station. If this is the case, the switching element remains in the error position, so that the first signal station is cut off from the communication with the rest of the communication network and in particular the other signal stations. However, the remainder of the communication network is not affected and continues to function. At a central location can be displayed, for example via a display device in the form of a display, where in the house signal system, the error has occurred. Of course, other display options are conceivable.

If the error detection device in the part of the communication network, which faces the first signal station, detects no error, the switching element is brought from the error position back into the forward position. This makes communication between the rest of the communication network and the first signal station possible again. It has proven to be particularly advantageous if each of the signal stations connected to the communications network of the in-house signaling system has such an upstream strand separator.

In this case, each of the strand separators has such an error detection device. In the case of a malfunction within the communication network, all the switching elements are thus brought from the respective passage position into the associated error position, so that the communication within the communication network of the house signal system completely comes to a standstill. Since each of the switching elements is in the error position, it is possible for the respective fault detection device of each strand separator to check whether the detected malfunction is present in the part of the communication network which is cut off by the respective strand separator from communicating with the remaining part of the communication network has been. This is usually the case only for a strand separator, the switching element remains in the error position. All other strand separators or the error detection devices contained therein will not detect a malfunction in the part of the communication network which faces the respective signal station, so that the switching element is returned to the forward position from the fault position. As a result, the passage of the communication signals from the bus system to the respective signal station is again possible, so that only the signal station in which the malfunction occurs remains disconnected from the communication network.

According to the strand separator is arranged in the bus system of the house signal system. This means that all communication wires, which are necessary for the communication between the individual signal stations of the house signal system, run into and out of the strand separator. The arrangement can be realized for example in a conventional flush-mounted box or in existing installation channels in the interior of a building. Special climatic requirements for thermal stabilities or environmental conditions when used in a conventional building on the strand separator itself therefore can not be provided. However, in order to ensure the functional integrity of the strand separator and thus the intact part of the communication network of the house signal system in a fire, can be slipped over such a strand separator, for example, a Überstülpkasten or other protection against fire. Alternatively, of course, the strand separator itself can be arranged in a housing which resists the expected dangerous situations.

Conventional house signal systems are often designed so that the bus system has a riser from which the lines to branch off the individual connected signal stations. In order to ensure that only one signal station in each case is separated by a line separator from the communication network, in this case from the riser line of the bus system, the line separator is advantageously arranged between the riser line and the respective signal station. However, smaller systems in particular are also implemented in central, star-shaped wiring. In this case, a strand separator is arranged in each case in the connection between the voltage source and the respective signal station.

Hereinafter, a house signal system is described for better clarity, which has only a strand separator, which is arranged between a riser of the bus system and the first signal station. Of course, however, the following also applies to star-wired communication networks and networks having multiple strand separators. However, it will be described by way of example only, the operation of a first strand separator.

Advantageously, the bus system comprises a DC bus having a first wire and a second wire, and the fault detection device comprises a voltage detecting device for detecting an electrical voltage between the first wire and the second wire. In this case, the strand separator is set up to bring the switching element in the error position when the detected electrical voltage is outside a predetermined range of values. For example, a microcontroller is provided in the strand separator.

A two-wire DC bus system is a particularly simple bus system known from the prior art. The first wire and the second wire of the DC bus in this case pass through the strand separator so that the fault detection device disposed in the strand separator and including a voltage detecting device can detect the voltage between the first wire and the second wire. This can be done for example via a voltage divider or other conventional device for detecting the electrical voltage.

If there is a malfunction, for example a short circuit, in the first signal station, which is arranged behind the strand separator by the riser of the bus system, this can be detected by the detected voltage. But even an overvoltage or an undervoltage between the first wire and the second wire of the DC bus can be determined. For example, it can be considered a malfunction if the voltage between the first wire and the second wire is permanently greater than 24.5 V or permanently less than 18.0 V. However, the selected values are dependent on the respective individual characteristics of the house signal system , If the switching element is in the transmission position, the error detection device detects the malfunctions mentioned in the entire communication network. Even if a different one than the first signal station has a malfunction, the switching element of the strand separator is thus brought into the error position.

If such a malfunction is detected while the switching element of the strand separator is in the forward position, it can therefore only be detected that there is a malfunction, but not in which part of the communication system. Therefore, once such a malfunction has been detected, the switching element is brought into the error position. Thereby, a test signal is passed to the first signal station, with which it can be determined whether the detected malfunction in the first signal station or the supply line there or not. If further elements are present on the side of the strand separator facing the first signal station, these are also examined for a malfunction. However, it can only be determined if there is a malfunction in this part of the communication network. Where exactly this is the case can not be determined. Therefore, it is usually useful to provide a separate strand separator for each signal station.

If it is determined with the test signal that the malfunction is present in this area of the communication network, the switching element remains in the error position. The first signal station thus remains disconnected from communication with the remainder of the communication network while the remainder of the communication network remains functional. Via a display device, for example a warning lamp, an indication can be given at a central position or, for example, at the affected first signal station that there is a malfunction in the part of the communication network which is disconnected from the strand separator. About certain sequences of flashing signals or other forms of messages can also be transmitted to what kind of malfunction, in the present example, so short circuit, over or undervoltage, it is.

Advantageously, the switching element switches in the fault position an electrical resistance in series with the first signal station. If, for example, there is a short circuit in the supply line to the first signal station, this is remedied by the addition of a further electrical resistance. The electrical voltage, the Normally should fall off at the signal station, now falls on the connected electrical resistance. The current flowing through the signal station is thereby significantly reduced. A particularly simple way to provide such a circuit is a bridged by the electrical resistance switch, which is opened as soon as the switching element is brought into the error position. If the fault detection device of the strand separator is arranged on the side of this switching element facing the signal station, it can be detected via the fault detection device whether the detected malfunction is present in the region of the communication network facing the first signal station. If this is not the case, the switch of the switching element can be closed again and the electrical resistance can be removed from the circuit. In this case, instead of the test signal, the communication signals are again sent to the first signal station.

Alternatively, the strand separator may also have a DC source. Then, in the error position, the switching element disconnects the first signal station from the DC bus and directs a DC current from the DC power source to the first signal station. As a result, only a test signal, in this case a test direct current, is conducted to the signal station, via which it can be determined whether the detected malfunction is present in this area of the communication network or not.

For the power supply of the strand separator, a further DC voltage line can be provided. In particular, the power supply can take place via this further line and the first wire or the second wire of the DC bus. Advantageously, a further fault detection device is provided in the strand separator, which also has a voltage detection device, but now detects the electrical voltage between the additional line required for the supply and the first wire or the second wire of the DC bus. Again, in the detection of a malfunction, the switching element of the strand separator can be brought into an error position, which works analogous to the above-described. Here too, it can then be checked whether the detected malfunction is present in the part of the communication network which, viewed from the strand separator, faces the first signal station.

The bus system of a house signal system may also comprise an AC bus with a third wire and a fourth wire. The term third wire and fourth wire is to be understood merely as naming the wires. It does not always have to have a first wire and a second wire for a DC bus. It is also conceivable that the bus system only comprises an AC bus with a third wire and a fourth wire. The error detection device in this case comprises at least one comparator for determining the sign of the electrical voltage between this third wire and the fourth wire. In this case, the strand separator is adapted to bring the switching element in the error position, if the certain sign does not change in a predetermined period of time. In particular, for the transmission of video signals, an AC bus is used. The sign of the applied between the third wire and the fourth wire electrical voltage changes constantly as a function of time. By the comparator, this sign can be determined permanently or at regular intervals. As soon as the sign no longer changes over a predetermined period of time, there is a malfunction. This can be, for example, in a short circuit of the third wire to the fourth wire or, if both an AC bus and a DC bus, also in a short circuit between the third wire or the fourth wire of the AC bus with one of the wires that power the strand separator or are provided for the DC bus exist. In this case, the switching element is brought into the error position, so that a test signal is passed to the first signal station to determine whether the malfunction is present in the separated by the strand separator portion of the communication network.

The strand separator advantageously comprises a signal generator and the switching element separates in the error position, the first signal station from the AC bus and passes a test signal from the signal generator to the first signal station. With this can then be determined whether the malfunction is still detectable. In this case, it is present in the separated part of the communication network, so that the switching element of the strand separator remains in the error position. However, if no malfunction is detected with the error detection device with the test signal from the signal generator, there is no malfunction in the part of the communication network which is disconnected from the line separator, so that the switching element is returned to the forward position.

In a preferred embodiment of the present invention, the strand separator comprises two identical defect detection devices, one of which is arranged in front of and one behind the switching element in the bus system. In this way it is particularly easy to realize that in the event that the switching element is in the error position, an error detection in the then separated part of the communication network can take place.

It is particularly advantageous if a strand separator is arranged between each signal station and the voltage source.

An inventive method for operating a described house signal system is characterized in that the switching element of the strand separator or each strand separator, is brought into the error position as soon as the error detection device detects a malfunction in the communication network. The switching element of the strand separator is brought into the forward position when the error detection device detects no malfunction in the part of the communication network, which faces from the strand separator of the first signal station.

Preferably, when switching on the house signal system, the switching element of the strand separator in the error position and is brought into the forward position only when the error detection means detects no malfunction in the part of the communication network, which faces from the strand separator from the first signal station.

With a house signal system according to the invention, it is consequently possible to disconnect the defective part of the communication network from the communication in the event of a malfunction which exists only in a part of the communication network of the house signal system. It is possible to display, for example via a display device at a central location, which part of the communication network has the malfunction and, within certain limits, even what malfunctions it is. The rest of the communication network remains functional.

With the aid of a drawing, an embodiment of the present invention will be explained in more detail below. It shows

1 - The schematic representation of a house signal system according to a first embodiment of the present invention and

2 - A schematic block diagram of a strand separator for a house signal system according to another embodiment of the present invention.

1 shows the schematic representation of a house signal system according to a first embodiment of the present invention. The signal system has a bus system 2 that is a riser 4 includes, from the supply lines 6 to signal stations 8th branch. In the in 1 upper three supply lines 6 there is one strand separator each 10 , Both the riser 4 as well as the supply lines 6 each comprise three wires, two of which form, for example, a DC bus and the third for a power supply of the strand separator 10 can be provided.

To the bus system 2 is a control and supply unit 12 connected via a voltage source 14 , in the 1 is indicated only schematically has.

To the control and supply unit 12 Other technical devices, such as a door opener 16 be connected.

In 1 is shown a house signal system, in which not every signal station 8th over its own strand separator 10 features. In the 1 lowest signal station 8th , which is here designed in the form of the outstation, so for example in an apartment building represents the element of the house signal system, which is arranged on the front door, has in its supply line 6 not over a strand separator 10 , This is a sensible solution in the present case, since a signal system, as in 1 is shown schematically, is essentially an intercom for a multi-party house. In the event that the outdoor station at the front door has a malfunction and fails, the entire house signal system is no longer useful, so that a separation of this lowermost signal station 8th from the communication system and the bus system 2 makes little sense.

In 1 is an optional panel 18 shown that can be used for hazard announcements. In addition, display elements can also be provided here, via which it is quickly and easily recognizable in which part of the communication network of the house signal system the malfunction exists. Every strand separator 10 is in the 1 shown embodiment between the voltage source 14 and a signal station 8th arranged. It thus monitors a part of the communication network that consists of a monitored bus section 20 and the respective signal station 8th consists. In 1 it can be seen that also different signal stations 8th can be used in a single house signal system. All these signal stations 8th are via the bus system 2 connected with each other and form with him the communication network.

2 shows a simplified block diagram of a strand separator 10 for a house signal system according to an embodiment of the present invention. At the in 2 left side of the block diagram has the strand separator 10 via an input terminal 22 for connection to the bus system 2 the signal system. On the right in 2 there is an output terminal 24 for connection to the monitored bus section 20 , Both the input terminal 22 as well as the output terminal 24 are each provided in the embodiment shown with six individual terminals, which are each designed to receive a wire. The bus system 2 for which the in 2 schematically shown strand separator 10 is provided has a DC bus with a first wire 26 and a second wire 28 , About a first voltage divider 30 can be the bus voltage on the DC bus, so the voltage between the first wire 26 and the second wire 28 be monitored. The measured or detected signal is sent to a microcontroller 32 sent for processing. Once the between the first wire 26 and the second wire 28 detected voltage is outside a predetermined range of values, that is, for example, greater than 24.5 V or less than 18 V, is a first switching element 34 actuated. As in 2 shown schematically is a switch that of a first ohmic resistance 35 is bridged. Will now about the first voltage divider 30 in determining the voltage between the first wire 26 and the second wire 28 detected a malfunction, for example, is a short circuit between the first wire 26 and the second wire 28 before, the microcontroller operates 32 the first switching element 34 and brings the switching element of the passage position, so the closed switch, in the error position. This is synonymous with that in the first wire 26 the first ohmic resistance 35 is switched. This is now in series with the terminal, so the signal station 8th , switched. By now in the first wire 26 located first ohmic resistance 35 the current flow is significantly reduced, so that only one test signal, ie a lower power, the terminal, so the signal station 8th , reached. About the first voltage divider 30 who is in 2 shown embodiment is part of the error detection device, it can now be determined whether the short circuit or malfunction that was detected in 2 right of the strand separator 10 located. If this is not the case, the first switching element 34 brought back from the error position in the Durchlassstellung.

In 2 above the first wire 26 there is an additional wire 36 , About the extra wire 36 and the second wire 28 the power supply of the strand separator takes place 10 , Of course, this can also be done via the extra wire 36 and the first wire 26 respectively. About a second voltage divider 38 can the tension between the extra wire 36 and the second wire 28 be determined. If a malfunction is detected here, the microcontroller will 32 a second switching element 40 actuated. This is in the 2 shown embodiment of a second ohmic resistance 41 bridged. Will the second switching element 40 brought into the error position, thus becomes the second ohmic resistance 41 in series with the signal station 8th switched, reducing the flow of current through the second wire 28 is reduced. In 2 is also schematically a bus connection 42 and a supply circuit 44 to supply the device components shown.

Through the first voltage divider 30 and the second voltage divider 38 Consequently, a short circuit between the first wire 26 and the second wire 28 , between the second wire 28 and the extra wire 36 and between the first wire 26 and the extra wire 36 be determined and detected. In addition, an overvoltage and an undervoltage between the first wire 26 and the second wire 28 or the extra wire 36 and the second wire 28 be determined. For example, it can be considered a malfunction if the voltage between the first wire 26 and the second wire 28 greater than 24.5V or less than 18V. Likewise, it can be considered a mistake if the voltage between the second wire 28 and the extra wire 36 greater than 28V and less than 15V.

However, the errors mentioned are not only detectable, but by the different values that the first voltage divider 30 and the second voltage divider 38 deliver as measured values and from which the respective applied voltage can be detected, also distinguishable from each other. This can be made clear, for example, by display elements. Such a display element may be, for example, an integrated optical error indicator, the strand separator 10 is arranged and over which the detected error can be visualized. This can be done for example by a multiple flashing of a signaling device, such as an LED, which may be red, for example. The optical error display preferably remains active until the error has been eliminated.

Once one of the above errors through the first voltage divider 30 or the second voltage divider 38 has been detected, becomes the first switching element 34 or the second switching element 40 brought from the passage position in the error position. By the arrangement of the first voltage divider 30 and the second voltage divider 38 in 2 to the right of the first switching element 34 or second switching element 40 It is now possible, with the test signal from the strand separator 10 directed to the respective signal station to determine whether the detected malfunction in the area to the right of the strand separator 10 present or not. Should not be be the case, becomes the first switching element 34 or the second switching element 40 immediately brought back into the passage position.

In a house signal system according to 1 Consequently, when a malfunction occurs, each strand separator 10 first, the first switching element 34 or the second switching element 40 bring in the error position. All strand breakers, whose signal station, however, works properly, become the switching elements 34 . 40 immediately bring back into the passage position, so that only the subject to the malfunctioning device of the communication via the bus system 2 remains cut off.

In addition to monitoring the voltage exists in particular between the first wire 26 and the second wire 28 the possibility of detecting further errors via a built-in receive circuit for the bus system. For example, this way can also cause a short circuit between the first wire 26 and the extra wire 36 be determined without directly measuring or detecting the voltage between the two wires. This happens, for example, when the supply voltage on the additional wire 36 for example, by the resistance of the supply line, in the tolerance range of the bus voltage and thus the over-voltage detection for the corresponding output is not responsive. In this case, first all connected line isolators switch 10 their units off, but after a short time switch the unaffected strand separator 10 their faultless units back to while the affected unit remains switched off.

The in 2 The strand separator shown schematically additionally comprises an alternating current bus with a third wire 46 and a fourth wire 48 , In addition, in 2 another supply 50 Looped. About the third wire 46 and the fourth wire 48 In particular, video signals are transmitted. This can happen, for example, in modern intercom systems in which a camera is arranged on the front door of a multi-party house, so that the person in an apartment whose doorbell has been operated can first of all inspect the ringing person before deciding to open the door or to be closed.

In the strand separator 10 as he is in 2 is shown schematically, is a first comparator 52 and a second comparator 54 provided for monitoring the video signals. With both comparators 52 . 54 is checked if the potential of the third wire 46 and the fourth wire 48 fluctuates. This should be done in the normal state in a range of about 0.25V. The output of the comparator connected to the microcontroller 32 connected in this case constantly changes the level. If there is no change in level, because, for example, the third wire 46 and the fourth wire 48 short-circuited or connected to a fixed potential, this is recognized as a malfunction. This does not happen even if no video signal on the third wire 46 and on the fourth wire 48 is the first comparator 52 near the input terminal 22 arranged, which allows a connection only if a video signal is present. Unless a malfunction by the comparators 52 . 54 is determined is a third switching element 56 pressed and both the third wire 46 as well as the fourth wire 48 separated. The strand separator 10 has a signal generator 58 that sends a test signal over the third wire 46 and the fourth wire 48 to the right of the in 2 shown strand separator located signal station sends. About the second comparator 54 can then be checked whether the detected malfunction in this area of the communication network is present or not. Through the comparators 52 . 54 can be both a short circuit between the third wire 46 and the fourth wire 48 as well as a short circuit between the third wire 46 or the fourth wire 48 with one of the other wires 26 . 28 . 36 . 50 be determined. However, with all these errors, the level of the comparators 52 . 54 no longer changes, these errors can not be distinguished from each other.

Because, in the event of a fault, the strand separator 10 cyclically checks whether the respective detected error has been eliminated, the respective supply line 6 or the connected signal station 8th automatically reconnected to the system once the malfunction has been corrected.

When switching on the signal system or even a strand separator 10 or when the strand separator is reset 10 are initially all switching elements 34 . 40 . 56 in the error position. About the bus system 2 only test signals are sent to the signal stations 8th sent to determine if all signal stations 8th work without errors. Only then will gradually the switching elements 34 . 40 . 56 the single strand separator 10 brought into the forward position, so that the signal stations can be supplied with the communication signals. In this case, advantageously, first the second switching element 40 brought into the passage position. Changes the voltage at the output of the additional wire 36 not, the switch-on is aborted immediately. Only when no error is detected, is now the first switching element 34 brought into the passage position.

The still separate video outputs of the third wire 46 and the fourth wire 48 are first switched several times by the microcontroller with multiple test signals, which also includes a multiple switching of the second comparator 54 at the output terminal 24 result if there is no malfunction. Will now also about the first comparator 52 detects a differential video signal, so the comparator switches several times, are now the third wire 46 and the fourth wire 48 by bringing the third switching element 56 in the passage position to the signal station 8th connected through. However, if a malfunction is detected when switching on or when switching on again, a strand separator will signal 10 this error via a dedicated protocol.

In particular, even if video signals are to be transmitted, while the video function can be outsourced to a separate circuit board, which then on the main circuit board in the strand separator 10 can be plugged. Thus, a substantially standard version corresponding circuit board can be used, whereby the production cost is reduced.

LIST OF REFERENCE NUMBERS

2

bus system

4

riser

6

supply

8th

signal station

10

strand separator

12

Control and supply unit

14

voltage source

16

Door Opener

18

paneling

20

monitored bus section

22

input terminal

24

output terminal

26

first wire

28

second wire

30

first voltage divider

32

microcontroller

34

first switching element

35

first ohmic resistance

36

additional wire

38

second voltage divider

40

second switching element

41

second ohmic resistance

42

bus connection

44

supply circuit

46

third wire

48

fourth wire

50

supply ground

52

first comparator

54

second comparator

56

third switching element

58

signaler

Claims (10)

Signaling system, in particular intercom, with - a first signal station ( 8th ), a second signal station ( 8th ) and at least one third signal station ( 8th ), - a bus system ( 2 ), via which the first signal station ( 8th ), the second signal station ( 8th ) and the at least one third signal station ( 8th ) are connected to each other for the transmission of communication signals and with which they form a communication network, and - a voltage source ( 14 ), characterized by at least one first strand separator ( 10 ), which - in the bus system ( 2 ) between the voltage source ( 14 ) and the first signal station ( 8th ), - a switching element ( 34 . 40 . 56 ) in a passage position in which the communication signals to the first signal station ( 8th ), and can be brought into an error position in which a test signal to the first signal station ( 8th ), an error detection device with which a malfunction in the communication network is detectable, when the switching element ( 34 . 40 . 56 ) is in the forward position, and with which a malfunction in a part of the communication system is detectable, which of the at least one strand separator ( 10 ) from the first signal station ( 8th ), when the switching element ( 34 . 40 . 56 ) is in the error position. Signaling system according to Claim 1, characterized in that the bus system ( 2 ) a DC bus with a first wire ( 26 ) and a second wire ( 28 ) and the error detection device comprises a voltage detection device ( 30 ) for detecting the electrical voltage between the first wire ( 26 ) and the second wire ( 28 ), wherein the strand separator ( 10 ), the switching element ( 34 ) in the error position, when the detected electrical voltage is outside a predetermined range of values. House signaling system according to claim 2, characterized in that the switching element ( 34 ) in the error position an electrical resistance ( 35 ) in series with the first signal station ( 8th ) switches. Signaling system according to claim 2, characterized in that the strand separator ( 10 ) comprises a DC power source and the switching element ( 34 ) in the error position, the first signal station ( 8th ) separates from the DC bus and a direct current from the DC power source to the first signal station ( 8th ). House signal system according to one of the preceding claims, characterized in that the bus system 2 an AC bus with a third wire ( 46 ) and a fourth wire ( 48 ) and the error detection device at least one comparator ( 52 . 54 ) for determining the sign of the electrical voltage between the third wire ( 46 ) and the fourth wire ( 48 ), wherein the strand separator ( 10 ), the switching element ( 56 ) to the error position if the particular sign does not change in a predetermined period of time. Signaling system according to claim 5, characterized in that the strand separator ( 10 ) a signal generator ( 58 ) and the switching element ( 56 ) in the error position, the first signal station ( 8th ) disconnects from the AC bus and a test signal from the signal generator ( 58 ) to the first signal station ( 8th ). Signaling system according to one of the preceding claims, characterized in that the strand separator ( 10 ) comprises two identical error detection devices, one of which in front of and one behind the switching element ( 56 ) are arranged in the bus system. Signaling system according to one of the preceding claims, characterized in that between each signaling station ( 8th ) and the voltage source ( 14 ) a strand separator ( 10 ) is arranged. Method for operating a house signal system according to one of the preceding claims, characterized in that the switching element ( 34 . 40 . 56 ) of the strand separator ( 10 ) is brought into the error position as soon as the error detection device detects a malfunction in the communication network and the switching element ( 34 . 40 . 56 ) of the strand separator ( 10 ) is returned to the forward position if the fault detection device does not detect a malfunction in the part of the communications network which is being disconnected from the line divider (FIG. 10 ) from the first signal station ( 8th ) is facing. A method according to claim 9, characterized in that when switching on the signal system or the strand separator ( 10 ) the switching element ( 34 . 40 . 56 ) of the strand separator ( 10 ) is in the error position, and is brought into the forward position only if the error detection device does not detect a malfunction in the part of the communication network which is disconnected from the strand separator (10). 10 ) from the first signal station ( 8th ) is facing.

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