EP0237457A1 - Exit controlling and monitoring system - Google Patents

Abstract

In the system, the exits are provided with opening request bars and latches. The system includes a central station and control boxes. Each control box is associated with an exit and is linked to the central station. The actuation of an opening request bar commands the sending of information to the central station by the associated control box. This triggers a first time delay To. During this, the opening of the exit can be condemned during a second time delay Tc. The opening is authorized at the end of the first time delay or at the end of the second time delay. A third time delay Tp is provided which can be triggered during the second time delay Tc to authorize the opening of the issue considered during the third time delay Tp and relock the issue considered at the end of the third time delay Tp by canceling the effect of the second time delay Tc. The system can also operate in anti-intrusion mode. It is particularly applicable in stores or public establishments of medium size.

Description

The present invention relates to a system for controlling and monitoring exits, the use of which is in particular provided for in stores selling medium-sized areas of the order of 2500 m².

The emergency exits of establishments open to the public are equipped with opening devices which must unlock these exits under the pressure of people, for rapid evacuation of the public in the event of an accident, such as a fire. In practice, to prevent these exits from being used fraudulently, either to bring people into the store or to get goods out of them, the user had first tended to condemn them, which was contrary to the regulations ; this is why we are now coming to install control and monitoring systems for these exits. Among these systems, the simplest consists in providing that the opening of an emergency exit causes the triggering of an alarm which warns a guard station; this system somewhat limits fraudulent use, but is not entirely effective. Another system, which is described in document EP-AO 156 752, still includes a guard station and, by emergency exit, an unlocking member, but it also provides that the actuation of the locking member locking in order to open an exit emergency orders the sending of information to the guard station and the launch of a first delay To during which the guard, installed at said guard post, can condemn the opening of the issue considered during a second delay Tc, the opening of the exit being authorized at the end of the first time delay To or, in the event of intervention by the guardian, at the end of the second time delay Tc. More particularly, this system is intended to be used in very large public establishments, in which at least some of the exits are monitored by video cameras.

An object of the present invention is to provide an improved system with respect to known systems, and in which the surveillance personnel can have more initiative.

Another object of the invention is to provide a system capable of serving as an anti-intrusion alarm system when the space to be monitored is closed to the public.

According to a characteristic of the invention, there is provided a system comprising a central station and control boxes, each control box being associated with an outlet and being connected to the central station, the actuation of a request bar for opening of the exit ordering the sending of information to the central station by means of the associated control box, which then triggers a first time delay To during which the opening of the considered issue can be condemned during a second time delay Tc, the opening of the issue considered being authorized at the end of the first time delay or at the end of the second time delay, a third time delay Tp can be triggered during the second time delay to authorize the opening of the issue considered during the third time delay Tp and relock the issue considered at the end of the third time delay Tp by canceling the effect of the second time delay Tc.

According to another characteristic, the central station comprises locking control means for locking and keeping the exits locked and switching means for actuating these locking control means.

According to another characteristic, the control links between the central station and the control boxes form a loop with branches to each control box.

According to another characteristic, the opening detection signaling link between the control boxes and the central station is a single line comprising in series working contacts respectively associated with the control boxes, each contact being closed when the corresponding issue has not been opened.

• la Fig. 1 est un schéma illustrant les moyens qui font partie du système de contrôle et de surveillance suivant l'invention et qui sont installés sur une issue et à proximité immédiate de celle-ci,
• la Fig. 2 est un diagramme du système de contrôle et de surveillance suivant l'invention et, en particulier, le block-diagram­me du poste central du système,
• la Fig. 3 est un schéma d'un détecteur d'appel suivant l'inven­tion,
• la Fig. 4 est un schéma d'une variante du détecteur de la Fig. 3,
• la Fig. 5 est le schéma d'un capteur d'ouverture connu,
• la Fig. 6 est le schéma d'un détecteur d'ouverture suivant l'invention, utilisant des capteurs montrés à la Fig. 5,
• la Fig. 7 est un schéma illustrant une variante de montage de capteurs de la Fig. 5,
• la Fig. 8 est le schéma d'un détecteur d'ouverture suivant l'invention,
• la Fig. 9 est un schéma d'une première partie du circuit de contrôle de l'unité de commande de la Fig. 2,
• la Fig. 10 est un schéma d'une seconde partie du circuit de contrôle de l'unité de commande de la Fig. 2,
• la Fig. 11 est un schéma du circuit de commande des verrous d'issue de la Fig. 2,
• la Fig. 12 est un schéma d'un circuit de sortie du microcontrô­leur de la Fig. 1,
• la Fig. 13 est un organigramme illustrant le fonctionnement du système quand celui-ci est à l'état OUVERT,
• la Fig. 14 est un diagramme Grafcet illustrant le fonctionne­ment de l'automate du système en relation avec l'organigramme de la Fig. 13,
• la Fig. 15 est un organigramme illustrant le fonctionnement du système quand celui-ci est à l'état FERME, et
• la Fig. 16 est un diagramme Grafcet illustrant le fonctionne­ment de l'automate du système en relation avec l'organigramme de la Fig. 15.

The characteristics of the invention mentioned above, as well as others, will appear more clearly on reading the following description of an exemplary embodiment, said description being made in relation to the accompanying drawings, among which:

• Fig. 1 is a diagram illustrating the means which form part of the control and monitoring system according to the invention and which are installed on an outlet and in the immediate vicinity thereof,
• Fig. 2 is a diagram of the control and monitoring system according to the invention and, in particular, the block diagram of the central station of the system,
• Fig. 3 is a diagram of a call detector according to the invention,
• Fig. 4 is a diagram of a variant of the detector of FIG. 3,
• Fig. 5 is the diagram of a known opening sensor,
• Fig. 6 is the diagram of an opening detector according to the invention, using the sensors shown in FIG. 5,
• Fig. 7 is a diagram illustrating a variant mounting of sensors of FIG. 5,
• Fig. 8 is the diagram of an opening detector according to the invention,
• Fig. 9 is a diagram of a first part of the control circuit of the control unit of FIG. 2,
• Fig. 10 is a diagram of a second part of the control circuit of the control unit of FIG. 2,
• Fig. 11 is a diagram of the control circuit for the exit locks of FIG. 2,
• Fig. 12 is a diagram of an output circuit of the microcontroller of FIG. 1,
• Fig. 13 is a flowchart illustrating the operation of the system when it is in the OPEN state,
• Fig. 14 is a Grafcet diagram illustrating the operation of the system controller in relation to the flow diagram of FIG. 13,
• Fig. 15 is a flowchart illustrating the operation of the system when it is in the CLOSED state, and
• Fig. 16 is a Grafcet diagram illustrating the operation of the system controller in relation to the flow diagram of FIG. 15.

In Fig. 1, there is shown an exit with two leaves to be monitored. Each leaf has a BAP panic bar, SW contacts which change state when a thrust is applied to the leaf considered, and a BC control box. The control box contains electrical and electronic circuits which include connections 1 to the electromagnets for locking the BAP bars, connections 2 to the contacts SW, a connection 3 to the contacts SX of opening sensors and connections 4 to a UC control unit. In addition, a siren (or a flashing) SIR and a volumetric sensor CPT are schematically represented and connected respectively by links 5 and 6 to the control box. Of course, a BC control box could also be associated with a single leaf outlet.

Fig. 2 shows the link 4 connecting the control boxes BC1 to BCm to the control unit UC. It appears that the link 4 forms a loop to which the control boxes of all the exits 1 to m are connected in derivation.

In Fig. 2, there is also shown, connected to the control unit UC, a supply circuit ALIM providing a supply of for example 12 V DC, a line 7 carrying a fire detection signal, a contact link 8 electric key CLE, and various auxiliary circuits, such as a remote control circuit 9, a telephone transmitter 10, a parking meter-recorder 11, a speech synthesis circuit 12 and various interfaces 13.

Essentially, a control box BC comprises a microprocessor circuit MP, also called a microcontroller, input circuits including a call detection processing circuit DA and an opening detection processing circuit DO, output circuits including a CV locking control circuit, an interface circuit CI for exchanging information with loop 4 and various other input and output circuits, listed below.

Thus in FIG. 1, we have also shown a power amplifier 14 whose output is connected to a light indicator 15, which for example turns yellow when at least one of the leaves has been opened, a power amplifier 16 whose output is connected to a sound emission or buzzer device 17, a power amplifier 18 whose output is connected to a light indicator 19 which turns red when the room is closed to the public (for the night), a power amplifier 20 whose output is connected to a light indicator 21 which turns green when the room is open to the public, an alarm circuit 22 connected to a line 23 transmitting an alarm signal, and an input amplifier 24 whose input is connected to link 4.

In Fig. 1, the line 1 is connected, on the one hand, to the output of the circuit CV by a diode D1 and, on the other hand, to the connection 4 by a diode D2, the diodes D1 and D2 having their cathodes connected together.

An example of a basic call detector is shown in Fig. 3. It includes an OR-exclusive gate P1 and a NAND-gate P2. The inputs E1 and E2 of the gate P1 are respectively connected to the working contact of a microswitch C1 and to the rest contact of a microswitch C2 whose common contacts are grounded. The microswitches C1 and C2 are contained in a BAP panic bar and normally change state when the panic bar is actuated. An input of the gate P2 is connected to the input E1 by means of an inverter Il and its other input is connected directly to the input E2. The inputs E1 and E2 are also connected to a voltage source of +12 V by two resistors R1 and R2 with a value of 600 ohms each, in order to be able to send a current of approximately 20 mA on the line wires. The outputs S1 and S2 of the doors P1 and P2 are connected to the logic circuit DA contained in the BC control box.

The call detector of FIG. 3 is used to detect either an action on the bar or a fault. Indeed:
- when C1 is open and C2 closed, the input E1 is at the high level and the input E2 at the low level. So the outputs S1 and S2 are both at the high level, which indicates that the bar is at rest,
- when C1 and C2 are open, E1 and E2 are at the high level. So, there is a defect: either that there is a divergence between the microswitches, or that the line is cut,
- when C1 is closed and C2 open, E1 goes to low level and E2 goes to high level. So, S1 is at the high level and S2 at the low level, which indicates that there is an action on the bar, that is to say a call, and
- when C1 and C2 are closed, E1 and E2 are both at the high level. S1 is at the low level and S2 at the high level, which again indicates a fault, either a divergence between the microswitches, or a short circuit on the line.

Thus, the call detector of FIG. 3 makes it possible to detect that a push has been exerted on the panic bar in order to obtain the opening of the monitored exit, that the two microswitches have a simultaneous operation or that the line which connects the bar to the box BC is neither cut nor short-circuited.

In practice, the functions of the doors P1 and P2 and of the inverter It are fulfilled by logic functions of the processing circuit DA to which the inputs E1 and E2 are connected.

As the exit generally consists of two leaves, each fitted with a BAP panic bar, two sets of microswitches and two sets of electronic doors are provided. The output signals are combined, for example by OR circuits.

The circuit of FIG. 4 shows a practical embodiment of a call detector for an exit with two leaves. It includes two sets of microswitches C1, C2 and Cʹ1, C'ʹ2, a source of +12 V, four resistors R1, R2 and Rʹ1, Rʹ2 of 600 ohms, with terminals E1, E2 and Eʹ1, Eʹ2. These terminals are connected to the inputs of four buffers or buffer amplifiers BF1, BF2 and BFʹ1, BFʹ2, the outputs of which are connected to the respective inputs of the logic circuit DA. The works ment of the detector of FIG. 4 is deduced in an obvious manner from that of the detector of FIG. 3. Of course, the logic functions of the electronic gates can be implemented in the DA circuit, which can also deal with contact bouncing phenomena so that no filtering is necessary.

Fig. 5 shows the diagram of the preferred embodiment of an opening sensor according to the invention.

It is recalled that a leaf opening sensor is, in general, constituted by a simple proximity contact which is a rest contact of which one terminal is grounded and the other connected, on the one hand, to a source voltage through a resistor and, on the other hand, a voltage comparator. Such an opening sensor does not make it possible to detect an opening when the contact has been maliciously short-circuited.

In the exemplary embodiment of FIG. 5, the opening sensor consists of a contact C3 in series with a resistor R3, the non-common terminal of the contact C3 being grounded and the non-common terminal of R3 being connected, on the one hand, to a source of voltage of +12 V by a resistor R4 and, on the other hand, at the input E3 of a voltage comparator. Resistor R3 and contact C3 are mounted together in a tamper-evident block installed in the rebate of a leaf. For example, the resistor R3 has a value of 200 ohms and the resistor R4 a value of 400 ohms.

When the contact C3 is closed at rest, the voltage at point E3, common to R3 and R4, has a value of +4 V. When the contact C3 is open, the voltage at E3 is +12 V. When the line enters E3 and C3 is cut, the voltage in E3 is 12 V. When the sensor is short-circuited, the voltage in E3 is 0 V. It appears that it is enough to check that the voltage in E3 is between +3 V and +5 V to find out if the contact is closed. Outside this range, there is an event to analyze.

The circuit of FIG. 6 shows an opening sensor circuit CO, which comprises a +12 V source to which the resistor R4 is connected, the terminal E3 of which, connected to the sensor, is also connected, on the one hand, to the inverting input of an operational amplifier OP1 and, on the other hand, at the non-inverting input of an amplifier OP2 operational designer. A voltage divider, comprising three resistors R5, R6 and R7 in series, is mounted between the +12 V source and the ground. The values of the resistors R5, R6 and R7 are respectively 7 kilohms, 2 kilohms and 3 kilohms. The point common to R5 and R6 is connected to the non-inverting input of OP1 while the point common to R6 and R7 is connected to the inverting input of OP2. The outputs of the comparators OP1 and OP2 are connected to the two inputs of an AND gate P3, the output of which is connected to the circuit MP. It appears that the output of gate P3 is at high level as long as the voltage at E3 is between +3 V and +5 V. When it goes low, the MP circuit interprets the change of state and, depending on its own state, can trigger an alarm via circuit 22, Fig. 1.

Fig. 7 is the diagram of a preferred example of mounting opening sensors, according to the invention, in the case where the opening detector is provided for an exit with two leaves each carrying a sensor according to FIG. 5. The two sensors C3, R3 and Cʹ3, Rʹ3, each belonging to a leaf, are connected in series, the free terminal of C3 being grounded and the free terminal of Rʹ3 being connected to a +12 V source by a resistance R8. The common point E4 to Rʹ3 and R8 is connected to a voltage comparator. In this mounting example, R3 = Rʹ3 = 200 ohms and R8 = 800 ohms. When the sensors are closed and the line between R8 and Rʹ3 is in the normal state, the voltage at E4 is +4 V. When the line between E4 and Rʹ3 is open or one of the sensors is open, the voltage in E4 is +12 V. When one of the sensors is short-circuited, the voltage in E4 is +2.4 V. When the two sensors or the line are short-circuited, the voltage in E4 is 0 V .

Fig. 8 shows the complete diagram of the mounting of an opening detector in which the circuit of FIG. 7. The terminals a , b and c , d for connecting the two leaves have been shown. Terminal a is connected to ground and to C3. Terminal b is connected to R3 and to terminal c , on the one hand, by a strap W1 and, on the other hand, a resistor R9. Terminal c is connected to contact Cʹ3 and terminal d to resistor Rʹ3, on the one hand, and to the input of a voltage comparator, on the other. In this arrangement, the resistor R9 is short-circuited by W1 and plays no role. In addition, between terminal d and the input terminal E4 of a comparator, which is identical to that of Fig. 6, there is provided a filter constituted by a resistor R10 of 10 kilohms in series and a capacitor CC1 of 10 microfarads in parallel. It will be possible to verify that this circuit operates under the same conditions as that of FIG. 7.

If you want to use this circuit with a single leaf, move the strap W1 between terminals c and d , the resistor R9 of 200 ohms entering the circuit so as not to disturb the operation of the comparator.

The part of the circuit of FIG. 8 which is to the right of terminal d is, in reality, in the circuit DO of FIG. 1.

The control unit UC comprises a console provided with a switch, push-buttons and a set of circuits connected to the connection loop 4. The diagrams of these circuits are shown in Figs. 9 and 10. In practice, the connection 4, symbolically represented in FIG. 2, consists of a bundle of wires and transmits from the control unit UC to the control boxes BC: the power supply at the voltage of +12 V by the wires 25, the auxiliary supply to the voltage of +24 V by the wires 26, the ground potential at OV, a status command, which will be described below, by the wire 27 and various command commands, such as the 3 min time delay command , the pre-arming command, the rearming command, the acknowledgment command, by the wire 28. In addition, line 23 makes it possible to receive the alarm signals from the control boxes BC.

As mentioned in the preamble to this description, the system of the invention is intended to operate in an "open" state, that is to say to protect people when the establishment is open to the public , and in "closed" state, when the establishment is closed, in particular to detect malicious intrusions. To this end, the control unit UC comprises the switch X1 with four positions: "closed", "CDE1", "CDE2" and "open", which can be actuated by means of a key held by a supervisor.

An input of switch X1, Fig. 9, is connected by a fuse F1 and a working contact kg1 to the source of +12 V. The outputs of the switch are connected to inputs of a generator of order 29 as well as to a timing circuit 30.

An input E5 of circuit 29 is connected to the outputs of OPEN and CDE2 states of X1. Between the input E5 and line 28, two paths are provided: one comprising the working contact of a + 3MN key, the rest contact of a PREARM key and an R11 resistor, and the other comprising a rest contact of the + 3MN key, a working contact of the PREARM key and a resistor R12. An input E6 is connected to the state outputs CDE1 and CDE2 of X1. Between E6 and line 28, there is a working contact with a REARM button and a resistor R13. An input E7 is connected to the state outputs CDE1 and CDE2 of X1. Between E7 and line 28, there is a working contact with an ACQ key. Furthermore, in circuit 29, line 28 is connected to ground by a resistor R14. The values of resistors R11, R12, R13 and R14 are respectively 450, 150, 50 and 150 ohms.

The timing circuit 30 is connected, firstly, to the CLOSED and CDE1 outputs of X1, secondly, to the CLE circuit by line 8 and, thirdly, to line 27 which transmits the CLOSED or OPEN information to the control boxes BC. In practice, the CLE circuit is used when the system is in the CLOSED state and the user enters the protected establishment.

In each control box BC, an order reception circuit CI is provided, FIG. 9, the input of which is connected to line 28. The circuit CI comprises four operational amplifiers OP3, OP4, OP5 and OP6, a voltage divider comprising, connected in series between the +12 V source and the ground, the resistors R15, R16, R17, R18 and R19 whose values are respectively 400, 600, 500, 300 and 600 ohms. The inverting inputs of the comparators OP3, OP4, OP5 and OP6 are respectively connected to the points common to R15 and R16, R16 and R17, R17 and R18, R18 and R19. The non-inverting inputs of the comparators OP3, OP4, OP5 and OP6 are respectively connected to line 28 by resistors R20, R21, R22 and R23 whose values are respectively 1470, 3600, 9600 and 11000 ohms. They are also connected to ground by capacitors CC2, CC3, CC4 and CC5, the values of which are 6.8, 6.8, 6.8 and 13.6 microfarads, respectively. The outputs S1 to S4 of the amplifiers OP3 to OP6 are connected to corresponding inputs of the MP circuit of the control box BC, Fig. 1.

When there is no signal to be transmitted via line 28, that is to say that none of the + 3MN, PREARM, REARM, ACQ keys are pressed, the voltage on the line is zero. Given the polarizations of the amplifiers OP3 to OP6, all the outputs S1 to S4 remain at the low level, the threshold of OP3 being +3 V. When the + 3MN key is pressed, a voltage of +3.5 V is applied to line 28 and only the output S1 goes high, because the OP4 threshold is +4.5 V. When the PREARM key is pressed, a voltage of +5.5 V is applied to line 28 and the outputs S1 and S2 go high because the OP4 threshold is +7 V. When the REARM key is pressed, a voltage of +8 V is applied to line 28 and the outputs S1, S2 and S3 go high because the OP6 threshold is +10 V. When the ACQ key is pressed, a voltage of +12 V is applied to line 28 and the four outputs S1 to S4 go high. Thus, the logical combinations of the levels of the outputs S1 to S4 make it possible to decode the nature of the command. In practice, the outputs S1 to S4 are connected to circuit MP which performs the decoding and draws the actions to be executed therefrom.

Note that an electrical lock prohibits the transmission of both the 3MN and PREARM commands. A similar lock is not provided for the REARM and ACQ keys, because these keys are, in principle, only available to the key holder, that is to say a manager of the establishment .

It should also be noted that the combinations, two by two, of the resistors R20 to R23 and the capacitors CC2 to CC5 establish, in addition to the filtering, increasing time constants so that whatever the command, the comparator whose threshold is just below the transmitted voltage switches first. It follows that there can be no false interpretation in the MP circuit that is programmed to scan from S4 to S1.

If line 28 is cut, no command being transmitted, the issue will be unlocked 8 seconds after the first action on a panic bar of this issue.

Furthermore, in FIG. 9, it appears that terminals E and S are provided for lines 25, 26, 27 and 28, which means that these lines are looped back. So cutting one wire leaves room for commands on the other wire.

The purpose of the delay circuit 30 is to delay the energization of the line 15 when the owner of the key, which makes it possible to actuate the switch X1, puts the latter in the CLOSED position. This delay allows him to pass through the exit door provided with the CLE circuit without the alarm being triggered. At the opening of the establishment, the action on the CLE circuit triggers another time delay in the circuit 30 which has the effect of removing the voltage on line 27 for the time necessary for the user to put the switch X1 on. OPEN position.

The UC control unit, Fig. 9, further includes connected in series between earth and the +12 V source, a general switch IG, a general cut-off relay KG and a fire loop 7. The relay KG is permanently supplied, unless line 7 opens or if the IG switch is pressed. The KG relay has two contacts, one kgl, in series with fuse F1, between source + 12V and line 25, the other kg2, in series with fuse F2, between source +24 V and line 26. Between fuse F1 and line 26, there is a diversion to alarm line 23, through a resistor R24.

In Fig. 10, on the alarm line 23 are mounted, in series, rest contacts kal of relays KAL, each provided in a control box BC. Then line 23 is looped to a relay KA, located in the control unit UC, and ground. The KA relay is energized when all the kal contacts are at rest and when the KG relay is at work. Otherwise, that is to say when an alarm must be triggered, it is de-energized.

The relay KA has a contact kal, on the one hand, connected directly to the +12 V source and, on the other hand, to the supply circuit of a signaling circuit 31 comprising a siren and indicator lights. It also includes a contact ka2 connected, on the one hand, directly to the +12 V source and, on the other hand, to a terminal of switch X1, the CLOSED state of this terminal being connected to the excitation circuit d '' a bistable KB relay, grounded. The de-excitation circuit of the relay KB is connected to the input E7 of the circuit 29, FIG. 9, via the ACQ key contact. The KB relay is normally energized as soon as switch X1 is in the CLOSED state. It has a break contact mounted in the trip circuit of a telephone transmitter 10, also shown in FIG. 2. In the CLOSED state, when the relay KA drops out, the relay KB triggers the operation of the telephone transmitter 10.

In Fig. 9, the state CDE1 allows the manager of the CPU unit to activate timer 30 or to acknowledge by the ACQ key. Thus it can, among other things, return the KB relay to its initial state.

Fig. 12 is the diagram of the alarm circuit 22 in a control box BC. A wire 32, normally supplied, is connected, on the one hand, to a corresponding output of the MP circuit of the box and, on the other hand, to the input of a buffer amplifier or buffer AMP1, in CMOS technology. The output of the amplifier AMP1 is connected by a resistor R25, of 3.3 kilohms, to the base of a switching transistor TR1 whose emitter is grounded and the collector connected to line 25 by the winding of the KAL relay, protected by a diode DI1. Fig. 12 also shows the working contact kal of the relay mounted on the alarm line 23.

In operation, when the circuit MP has received from the circuit DO information signaling an opening, it brings the wire 32 to the low level, which causes the relay KAL to drop and opens the contact kal, triggering the alarm by line 23.

The power circuits 14, 16, 18 and 20 are preferably of the same type as that shown in FIG. 9 to trigger a local alarm including a siren and turn on (or off) indicator lights, which identify the outcome that is the subject of an event.

Fig. 11 is the diagram of the circuit for controlling the lock or the locks of an outlet, this circuit being located in the control box BC of the outlet.

The circuit of FIG. 11 includes a wire 33 connected to a corresponding terminal of the MP circuit and on which are mounted, in series, a resistor R26 of 1.5 kilohm and a capacitor CC6 of 22 nF whose terminal not connected to R26 is connected, of a on the other hand, at the input of an AMP2 amplifier and, on the other hand, to ground by an R27 resistance of 330 kilohms. Bypassed on resistance R27, is mounted a diode DI2 for restoring the DC component. The capacitor CC6 and the resistor R27 together constitute a branch circuit. The output of the amplifier AMP2 of CMOS technology is connected to the base of a switching transistor TR2 by, in series, a resistor R28 of 100 ohms, a direct diode DI3 and a resistor R29 of 3.3 kilohms. The point common to the diode DI3 and to the resistor R29 is connected to ground by a tantalum capacitor CC7 of 33 microfarads. Resistor R29 and capacitor CC7 together form a time constant bias circuit. The emitter of transistor TR2 is grounded and its collector is connected to the +12 V supply line 25 by the winding of a relay KVR, protected by a diode DI4.

The relay KVR has a working contact kvr mounted between line 25 of +12 V and the anode of a diode DI5. Between line 27 and the cathode of diode DI5 is mounted a diode DI6 while between ground and the cathode of diode DI5 is mounted a diode DI7. The point common to the cathodes of the diodes DI5 to DI7 is connected to ground by the winding of the lock relay (s) VR of the leaves of the exit.

When the establishment is in the OPEN state, the line 27 is not supplied and the wire 33 normally receives from the circuit MP a rectangular alternating signal, for example with a period of 100 ms and a duty cycle 1. The derivative CC6, R27 then transmits a signal to the amplifier AMP2 which periodically charges the capacitor CC7. Therefore, the transistor TR2 remains supplied and the relay KVR is at work causing the excitation of the latch relays VR by kvr. If the MP circuit ceases to apply the rectangular signl to wire 33, the KVR relay falls back unlocking the issue.

Furthermore, when the establishment is in the CLOSED state, line 27 directly supplies the lock relays VR, by the diode DI6. Diode DI7 serves as a non-return diode.

The MP circuit of each control box BC can, in practice, be a microcontroller of the 8051 type from the MCS51 family manufactured by the company INTEL. The internal structure of this microcontroller is well known to those skilled in the art. The output ports of the microcontroller are, for example, connected as follows: PO0 to wire 33, PO1 to wire 32, PO2 to a local alarm circuit comprising the SIR siren, PO3 to circuit 20 supplying the green light 21, lit when the establishment is in the OPEN state, PO4 to circuit 18 supplying the red light 19, on when the establishment is in the CLOSED state, PO5 on circuit 16 supplying the flashing light 17, and PO6 on circuit 14 supplying the orange indicator 15 of a crossing memory.

The input ports of the MP microcontroller can be connected as follows: P10 to wire E1, Fig. 3, from a BAP bar, P11 to wire E2 of the same bar, P12 to wire E1 of the other BAPT bar and P13 to wire E2 of this other bar, P15 at the common output of the DO circuit, P16 at the output another CPT sensor, P20 at the output of the amplifier 24 connected to the wire 27, P21 to the wire S1, FIG. 9, P22 to wire S2, P23 to wire S3 and P24 to wire S4. The conventional power supply input VCC of the microcontroller is connected to line 25 through a regulator REG. An oscillator or SM "timer" allows the microcontroller to deliver the rectangular signal on wire 33.

Fig. 13 is a flowchart illustrating the operation of the system when the establishment is in the OPEN state. It appears that an action on the BAP panic bar of an exit triggers the process. In the absence of an action by a supervisor, the lock opens after 8 seconds, leaving the free play of the panic bar. On the other hand, during these 8 seconds, a supervisor, after making sure that there is no panic, can extend the time delay by 3 minutes by pressing the + 3MN key on the console of the UC control unit . Without further maneuver, the lock opens after these 3 minutes. However, during these 3 minutes, he can, after dealing with the problem of the request to exit, pre-arm the lock by pressing the PREARM key on the console of the control unit. For security reasons, the lock opens then, after 4 seconds, re-locks. The supervisor can also reset the lock by pressing the REARM button on the control unit console. Each time that the exit has been opened, the microcontroller MP of the corresponding exit can send a signal to a crossing memory associated with 15 and which accounts for the openings. Note that unlocking a panic bar does not necessarily mean opening the corresponding exit.

Fig. 14 is a standardized "GRAFCET" diagram which illustrates the operation of the system controller for the status of the OPEN establishment.

Fig. 15 is a flowchart illustrating the operation of the system when the establishment is in the CLOSED state. It appears that the alarm is triggered by raising awareness of the rebate contacts of an exit. In this case, the crossing memory is armed at the same time as the alarm is triggered. The alarm creates for 30 seconds, for example, local actions, such as the operation of a siren or a flashing of indicators. The initial state is not restored until an authorized supervisor has pressed the ACQ acknowledgment key.

Fig. 16 is a standardized "GRAFCET" diagram which illustrates the operation of the automaton for the state of the CLOSED establishment.

In practice, it is also possible to provide supervisors outside the field of vision of the main supervisor assigned to the console with a remote control transmitter, which is provided with at least three push buttons. The first button is provided to obtain, in the UC unit, the opening of the IG switch which causes the general opening of the exits. The second is used to close a contact, not shown in FIG. 9, which short-circuits the contact of the + 3MN key. The third is used to close a contact, not shown in FIG. 9, which short-circuits the working contact of the PREARM key.

In an alternative embodiment, line 23, FIG. 10, would be doubled by a transmission line which would be connected to the S-AS circuit of the control boxes BC1 to BCm. Each S-AS circuit is connected to a terminal PX of the MP circuit and is used to transmit a word in serial asynchronous mode which makes it possible to identify the box BC which has been activated, whereas line 23 does not allow this identification. The words sent by the boxes are received in the control unit which decodes them.

Of course, a receiver is provided in the control unit to close or open these contacts, in parallel with the keys of the console of the control unit. The transmission between transmitters and receiver is established by known radio means, avoiding conflicts between the different remote control orders.

Claims (5)

1) Exit control and monitoring system provided with opening request bars and locks, comprising a central station and control boxes, each control box being associated with an outlet and being connected to the central station, l actuation of an exit opening request bar commanding the sending of information to the central station via the associated control box, which then triggers a first time delay To during which the opening of the the issue considered can be condemned during a second time delay Tc, the opening of the issue considered being authorized at the end of the first time delay or at the end of the second time delay, characterized in that a third time delay Tp is provided which can be triggered during the second time delay to authorize the opening of the issue considered during the third time delay Tp and relock the issue considered at the end of the third time delay Tp in year canceling the effect of the second time delay Tc. 2) System according to claim 1, characterized in that the central station comprises locking control means for locking and keeping the exits locked and switching means for actuating these locking control means. 3) System according to claim 1 or 2, characterized in that the control links between the central station and the control boxes form a loop with branches to each control box. 4) System according to one of claims 1 to 3, characterized in that the opening detection signaling link between the control boxes and the central station is a single line comprising in series working contacts respectively associated with the boxes control, each contact being closed when the corresponding sue has not been opened. 5) System according to claim 4, characterized in that the opening detection signaling link is doubled by a link operating in asynchronous serial mode to which the control boxes are connected, which each comprise an identity transmission circuit , said link being connected in the control unit to an identification circuit.

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