Security Device

Abstract

To provide a security device, to which an anomaly detection sensor is connected, that can easily and adequately diagnose without intervening the anomaly detection sensor.SOLUTION: In a security device 100, first switching circuits 102(1)-102(n) switch between an output signal from a sensor and a diagnostic signal from a diagnostic signal generating circuit 106 in order to supply either of the signals to sensor state monitoring circuits 103(1)-103(n). A control unit 150 includes: switching the first switching circuit 102(1) so as to supply the diagnostic signal to the sensor state monitoring circuit 103(1); confirming the output signal from the sensor state monitoring circuit 103(1); and determining whether or not the sensor state monitoring circuit 103(1) functions normally. The control unit also performs the same processing as above with respect to the sensor state monitoring circuits 103(2)-103(n).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a security device that detects the occurrence of an abnormal event, such as the outbreak of a fire or the intrusion of a suspicious person, and sends a report to a predetermined reporting destination. [Background technology]

[0002] So-called security devices are often installed in offices, schools, commercial facilities, etc., where there are no users at night or on holidays. Security devices are also being used in ordinary homes to ensure safety at night when residents are often out and about or asleep and cannot be seen. For example, as shown in Fig. 7, security devices 10 installed in various security target facilities 1 are connected to various abnormality detection sensors such as a fire sensor SX1 and an intrusion sensor SX2.

[0003] The fire sensor SX1 includes a smoke sensor that detects smoke and a heat sensor that detects heat. The intrusion sensor SX2 includes a so-called human sensor that detects infrared rays emitted by humans, an opening / closing sensor that uses a magnetic sensor to detect the opening / closing of a door or window, and an impact sensor that detects the impact when a window or door is broken. These various abnormality detection sensors are connected to a sensor input circuit section 11 of the security device 10. The sensor input circuit section 11 of the security device 10 monitors the output signals from each abnormality detection sensor SX1, SX2, ..., and when it detects the occurrence of an abnormality, it reports the occurrence of an abnormality to a predetermined report destination, for example, a security destination accommodation device 30 of a security company 3, via a wide area network 2.

[0004] The wide area network 2 is a communication network such as a general public telephone network, a mobile phone network, or the Internet. In the security company 3, when the guarded accommodation device 30 receives a report from the security device 10 of the security target facility 1, it notifies the monitor 40 by, for example, emitting a sound of a received message. The monitor 40 operates the guarded accommodation device 30 to identify the source of the report and instructs the security guard 50 to be dispatched to the source of the report. This enables the security guard to be quickly dispatched to the security target facility 1 where an abnormality has occurred and to take appropriate action.

[0005] In this way, the security device 10 must function normally even when an abnormality occurs, so periodic diagnosis (inspection) is important. If this diagnosis reveals that the device is not functioning normally, it must be possible to properly identify whether the problem is with the abnormality detection sensors SX1, SX2, ... or with the sensor input circuit section 11 of the security device 10. For this reason, for example, as in the invention disclosed in Patent Document 1, it is conceivable to make it possible to identify the location of a fault by detecting, for example, a voltage value at the connection terminal between the abnormality detection sensors SX1, SX2, ... and the sensor input circuit section 11 or at the output terminal of the sensor input circuit section 11. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6580249 Summary of the Invention [Problem to be solved by the invention]

[0007] Abnormality detection sensors such as the fire sensor SX1 and the intrusion sensor SX2 are installed in locations where abnormalities may occur, and the security device 10 is installed in a safer location, so they are installed separately. Also, abnormality detection sensors such as the fire sensor SX1 and the intrusion sensor SX2 may be replaced periodically even if no malfunctions occur. For this reason, it is desirable to be able to perform diagnosis of abnormality detection sensors such as the fire sensor SX1 and the intrusion sensor SX2 separately from diagnosis of the security device 10.

[0008] Furthermore, if the security device 10 is diagnosed in advance and confirmed to be operating normally, it will be easier to diagnose the cooperation between the security device 10 and abnormality detection sensors such as the fire sensor SX1 and the intrusion sensor SX2. In this case, if a malfunction occurs, it will be easier to deal with it because it will be known that the malfunction is on the abnormality detection sensor side.

[0009] In view of the above, an object of the present invention is to enable simple and appropriate diagnosis in a security device to which an abnormality detection sensor is connected, without the need for the abnormality detection sensor. [Means for solving the problem]

[0010] In order to solve the above problem, the security device of the invention described in claim 1 is: A security device equipped with a sensor state monitoring circuit that monitors an output signal from a sensor that detects the occurrence of an abnormality and notifies a predetermined notification destination when the occurrence of an abnormality is detected, a diagnostic signal generating circuit for generating a diagnostic signal; a first switching circuit that switches whether the output signal from the sensor or the diagnostic signal from the diagnostic signal generating circuit is to be supplied to the sensor state monitoring circuit; a first control unit that controls switching of the first switching circuit; a discrimination unit that discriminates whether the sensor state monitoring circuit is normal or abnormal based on an output signal from the sensor state monitoring circuit when the first control unit switches the first switching circuit to supply the diagnostic signal to the sensor state monitoring circuit; 、 a circuit for monitoring an output signal from the sensor and, when detecting an abnormality, reporting the occurrence of the abnormality to a predetermined reporting destination; a second switching circuit that switches whether the output signal from the sensor is supplied to the in-diagnosis sensor state monitoring circuit or the first switching circuit; a second control unit that controls switching of the second switching circuit; Equipped with When the first control unit switches the first switching circuit to supply the diagnostic signal to the sensor state monitoring circuit, the second control unit switches the second switching circuit to supply the output signal from the sensor to the during-diagnosis sensor state monitoring circuit. It is characterized by: Effect of the Invention

[0012] According to the present invention, in a security device to which an abnormality detection sensor is connected, diagnosis (inspection) can be performed simply and appropriately without the intervention of the sensor. [Brief description of the drawings]

[0013] [Figure 1] 1 is a block diagram for explaining a configuration example of a security device according to a first embodiment; [Diagram 2] 4 is a flowchart for explaining the diagnostic processing of the sensor state monitoring circuit performed in the security device of the first embodiment. [Diagram 3] FIG. 11 is a block diagram for explaining a configuration example of a security device according to a second embodiment. [Figure 4] 13 is a flowchart for explaining the diagnostic processing of the sensor state monitoring circuit performed in the security device of the second embodiment. [Diagram 5] FIG. 13 is a block diagram for explaining a configuration example of a security device according to a third embodiment. [Figure 6] 13 is a flowchart for explaining the diagnostic processing of the sensor state monitoring circuit performed in the security device of the third embodiment. [Figure 7] FIG. 1 is a diagram for explaining a configuration example of a security system configured using a security device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of a security device according to the present invention will be described with reference to the drawings. The security device of the embodiment described below is installed in various security target facilities such as offices, schools, commercial facilities, and general homes, and automatically reports to a predetermined reporting destination such as a security company when it detects an abnormality such as a fire or the intrusion of a suspicious person. The security device includes a plurality of fire sensors and a plurality of intrusion sensors installed in various locations of the security target relocation, and a sensor status monitoring circuit that monitors the output signals from these fire sensors and intrusion sensors and issues an instruction to report when it detects an abnormality.

[0015] In the security device described below, diagnosis (inspection) of the sensor state monitoring circuit can be performed without the intervention of a fire sensor or an intrusion sensor. Three embodiments of the security device according to the present invention will be specifically described below. In addition, in the embodiments described below, the fire sensor is a smoke sensor that detects smoke or a heat sensor that detects heat, and the intrusion sensor is a human sensor, an opening / closing sensor that detects the opening / closing of a door or window, an impact sensor that detects an impact when a window or door is broken, etc. However, for the sake of simplicity of explanation, these abnormality detection sensors will be collectively referred to simply as sensors without distinguishing between fire sensors and intrusion sensors.

[0016] [First embodiment] <Configuration Example of Security Device 100 of First Embodiment> FIG. 1 is a block diagram for explaining a configuration example of a security device 100 according to a first embodiment. The security device 100 is roughly divided into a plurality of sensors SS1, SS2, ..., SSn and a security device main body. As described above, the sensors SS1, SS2, ..., SSn are fire sensors, or It is an intrusion sensor that outputs a high-level signal (detection signal) when it detects an abnormality. The subscript n in sensor SSn means a positive integer. In the example shown in FIG. 1, since sensors SS1 and SS2 already exist, the subscript n means an integer of 3 or more. In the following, the subscript n and the letter n in parentheses are used in the same sense.

[0017] The security device main body is made up of an input circuit, an output circuit, and a control unit 150. The input circuit is made up of a sensor connection unit 101, first switching circuits 102(1), 102(2), ..., 102(n), sensor state monitoring circuits 103(1), 103(2), ..., 103(n), a diagnostic signal generating circuit 106, and a transistor 107. The output circuit is made up of output switching circuits 104(1), 104(2), ..., 104(n) and a communication unit 105. The control unit 150 is a so-called microprocessor that is configured with a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), non-volatile memory, etc., although not shown.

[0018] Each of the sensors SS1, SS2, ..., SSn is connected to the security device main body through a sensor connection unit 101, and is connected to a terminal a of the corresponding first switching circuit 102(1), 102(2), ..., 102(n) through the sensor connection unit 101. A diagnostic signal generating circuit 106 is connected to a terminal b of the first switching circuit 102(1), 102(2), ..., 102(n) through a transistor 107. The diagnostic signal generating circuit 106 generates and outputs a diagnostic signal for diagnosing whether the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) described later are functioning normally or not. The diagnostic signal is the same as a high level (detection signal) output when an abnormality is detected in each of the sensors SS1, SS2, ..., SSn.

[0019] Each of the first switching circuits 102(1), 102(2), ..., 102(n) switches between outputting an output signal from the sensor SS1, SS2, ..., SSn connected to the terminal a, and outputting a diagnostic signal from the diagnostic signal generating circuit 106. Each of the first switching circuits 102(1), 102(2), ..., 102(n) is switched under the control of the control unit 150.

[0020] The sensor status monitoring circuits 103(1), 103(2), ..., 103(n) monitor whether the output signals from the sensors SS1, SS2, ..., SSn have become high level. Assume that the sensor status monitoring circuits 103(1), 103(2), ..., 103(n) detect that the output signals from the sensors SS1, SS2, ..., SSn have become high level. In this case, the sensor status monitoring circuits 103(1), 103(2), ..., 103(n) form and output a detection signal. The detection signal includes, for example, information indicating the type of sensor that detected the abnormality (whether it is a fire sensor or an intrusion sensor) and information indicating that an abnormality has been detected (for example, a signal that becomes high level).

[0021] The output switching circuits 104(1), 104(2), ..., 104(n) switch whether or not to supply the detection signals from the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) to the communication unit 105. That is, during a fault diagnosis, it is unnecessary to notify a security company or the like in response to the output signals from the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) to be diagnosed, since no abnormality actually occurs. Therefore, by turning off the output switching circuit 104(m) corresponding to at least the sensor state monitoring circuit 103(m) to be diagnosed, it is possible to prevent the notification during the diagnosis. Note that the letter m in parentheses means an integer of 1 or more. Note that the letter m in parentheses will be used in the following description in the same sense. Also, the output switching circuits 104(1), 104(2), ..., 104(n) are switched and controlled by the control unit 150.

[0022] Under the control of the control unit 150, when a detection signal is supplied from the sensor state monitoring circuits 103(1), 103(2), ..., 103(n), the communication unit 105 performs processing to form a notification signal and transmit the signal to a predetermined notification destination such as a security company. The notification signal includes, for example, information indicating the type of abnormality that has occurred as indicated by the detection signal (e.g., fire or intrusion) and information specifying the facility to be guarded where the abnormality has occurred.

[0023] In the security device 100 of the first embodiment, when in security mode, the first switching circuits 102(1), 102(2), ..., 102(n) are switched to the terminal a side. In addition, the output switching circuits 104(1), 104(2), ..., 104(n) are set to be in the ON state. As a result, output signals from the sensors SS1, SS2, ..., SSn are supplied to the sensor status monitoring circuits 103(1), 103(2), ..., 103(n), and if an abnormality is detected, a report is immediately sent via the communication unit 105.

[0024] In the security device 100 of the first embodiment having such a configuration, for example, a case where the sensor state monitoring circuit 103(1) is diagnosed will be considered. In this case, as shown in Fig. 1, the control unit 150 switches the first switching circuit 102(1), which is a circuit unit corresponding to the sensor state monitoring circuit 103(1), to the terminal b side, and switches the output switching circuit 104(1) to the off state. Furthermore, the control unit 150 controls the diagnostic signal generating circuit 106 to generate and output a diagnostic signal.

[0025] As a result, the diagnostic signal from the diagnostic signal generating circuit 106 is supplied to the sensor state monitoring circuit 103(1) through the first switching circuit 102(1). The sensor state monitoring circuit 103(1) forms a detection signal in response to the diagnostic signal in the same manner as when an abnormality is detected in the sensor SS1, and outputs the detection signal. As described above, since the output switching circuit 104(1) is in the off state, the detection signal from the sensor state monitoring circuit 103(1) is supplied only to the control unit 150, and is not supplied to the communication unit 105. Therefore, no notification is sent to a security company or the like, and the control unit 150 determines whether the sensor state monitoring circuit 103(1) is functioning normally.

[0026] That is, in this example, when the sensor state monitoring circuit 103(1) functions normally, the sensor state monitoring circuit 103(1) forms and outputs a detection signal in response to the diagnostic signal from the diagnostic signal generating circuit 106. Therefore, when the detection signal is normally output from the sensor state monitoring circuit 103(1), the control unit 150 determines that the sensor state monitoring circuit 103 is functioning normally. Conversely, the control unit 150 assumes that the sensor state monitoring circuit 103(1) does not output a detection signal even though the diagnostic signal from the diagnostic signal generating circuit 106 is supplied to the sensor state monitoring circuit 103. In this case, since the detection signal is not supplied to the control unit 150, the control unit 150 determines that the sensor state monitoring circuit 103 is not functioning normally (has broken down).

[0027] The above is a response when diagnosing the sensor state monitoring circuit 103(1), but the same process is performed in order for the sensor state monitoring circuits 103(2), ..., 103(n). That is, the first switching circuits 102(1), 102(2), ..., 102(n) and the output switching circuits 104(1), 104(2), ..., 104(n) are switched in order. As a result, the diagnostic signal from the diagnostic signal generating circuit 106 is supplied in order to the sensor state monitoring circuits 103(2), ..., 103(n), and each of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) can be diagnosed.

[0028] Alternatively, all of the first switching circuits 102(1), 102(2), ..., 102(n) may be switched to the terminal b side, and all of the output switching circuits 104(1), 104(2), ..., 104(n) may be turned off to output a diagnostic signal. In this case, all of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) may be diagnosed at the same time. In this case, information indicating which sensor state monitoring circuit output the detection signal is added to the detection signal output from each of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n). This makes it possible to identify which of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) is not functioning properly.

[0029] However, if all of the sensor status monitoring circuits 103(1), 103(2), ..., 103(n) are diagnosed at the same time, even if an abnormality is detected in the sensors SS1, SS2, ..., SSn during the diagnosis process, it will not be possible to report it. For this reason, it is necessary to appropriately select the timing of the diagnosis process. Therefore, the number of cases where it is not possible to report can be minimized by adopting a method of diagnosing the sensor status monitoring circuits 103(1), 103(2), ..., 103(n) in order.

[0030] <Example of Processing Performed by the Security Device 100 of the First Embodiment> Fig. 2 is a flowchart for explaining the diagnostic process of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) performed in the security device 100 of the first embodiment. The diagnostic process shown in Fig. 2 is executed by the control unit 150 of the security device 100. Before execution of this diagnostic process, it is assumed that the first switching circuits 102(1), 102(2), ..., 102(n) are all switched to the terminal a side, and the output switching circuits 104(1), 104(2), ..., 104(n) are all in the on state.

[0031] 2, the control unit 150 first initializes a variable x (step S101) and sets the variable x to an initial value of "1" (step S102). Next, the control unit 150 switches the first switching circuit 102(x) to terminal b (step S103) and turns off the output switching circuit 104(x) (step S104). This makes it possible to diagnose the sensor state monitoring circuit 103(x).

[0032] Thereafter, the control unit 150 controls the diagnostic signal generating circuit 106 to generate and output a diagnostic signal (step S105). As a result, the diagnostic signal is supplied to the sensor state monitoring circuit 103(x) to be diagnosed through the first switching circuit 102(x), and if the sensor state monitoring circuit 103(x) is operating normally, a detection signal is formed, output, and supplied to the control unit 150. Therefore, the control unit 150 checks the output (detection signal) from the sensor state monitoring circuit 103(x) (step S106). As a result, it is possible to check (diagnose) whether the sensor state monitoring circuit 103(x) is operating normally.

[0033] Next, the control unit 150 switches the first switching circuit 102(x) to the terminal a side, and returns the output switching circuit 104(x) to the ON state (step S107). The control unit 150 determines whether the variable x is the final value n (step S108). When it is determined in the determination process of step S108 that the variable x is not the final value, the control unit 150 adds a value of "1" to the variable x, and repeats the process from step S103 to diagnose the next sensor state monitoring circuit 103(x).

[0034] In the determination process of step S108, it is determined that the variable x is the final value. In this case, the control unit 150 outputs the confirmation results (diagnosis results) for all of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) (step S110), and ends the process of the flowchart shown in FIG. 2. Note that the result output process of step S110 can notify the diagnosis result to a reporting destination such as a security company through the communication unit 105, or output from a display or printer of a terminal device connected wirelessly or by wire to the control unit 150, although not shown in FIG. 1. In this way, the diagnosis of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) can be performed in order without the intervention of the sensors SS1, SS2, ..., SSn.

[0035] [Second embodiment] In the case of the security device 100 of the first embodiment described above, when diagnosis is being performed on the sensor status monitoring circuits 103(1), 103(2), ..., 103(n), the corresponding sensors SS1, SS2, ..., SSn are in a state of being disconnected from the security device's main part. Therefore, even if an abnormality is detected by at least a sensor in a disconnected state, a report cannot be made. Therefore, the security device 100A of the second embodiment is designed to be able to make a report even if an abnormality is detected by a sensor SS1, SS2, ..., SSn in a state of being disconnected from the corresponding sensor status monitoring circuit 103(1), 103(2), ..., 103(n).

[0036] <Configuration Example of Security Device 100A of Second Embodiment> Fig. 3 is a block diagram for explaining a configuration example of the security device 100A of the second embodiment. In the security device 100A shown in Fig. 3, the same reference numerals are given to the parts configured similarly to the security device 100 of the first embodiment shown in Fig. 1, and detailed explanations of the parts are omitted to avoid duplication. As shown in Fig. 3, the security device 100A of the second embodiment is equipped with second switching circuits 108(1), 108(2), ..., 108(n) and a sensor state monitoring circuit 109 during failure diagnosis.

[0037] The second switching circuits 108(1), 108(2), ..., 108(n) are provided between the first switching circuits 102(1), 102(2), ..., 102(n) and the sensors SS1, SS2, ..., SSn. The input terminals of the second switching circuits 108(1), 108(2), ..., 108(n) are connected to the corresponding sensors SS1, SS2, ..., SSn. The output terminals a of the second switching circuits 108(1), 108(2), ..., 108(n) are connected to the fault diagnosis sensor state monitoring circuit 109. The output terminals b of the second switching circuits 108(1), 108(2), ..., 108(n) are connected to the corresponding terminals a of the first switching circuits 102(1), 102(2), ..., 102(n).

[0038] Therefore, when the second switching circuits 108(1), 108(2), ..., 108(n) are switched to the terminal a side, they supply output signals from the sensors SS1, SS2, ..., SSn to the sensor state monitoring circuit 109 during fault diagnosis. Also, assume that the second switching circuits 108(1), 108(2), ..., 108(n) are switched to the terminal b side. In this case, the output signals from the sensors SS1, SS2, ..., SSn are output to the terminals a of the corresponding first switching circuits 102(1), 102(2), ..., 102(n).

[0039] The sensor state monitoring circuit 109 during fault diagnosis has the same functions as the sensor state monitoring circuits 103(1), 103(2), ..., 103(n). However, the sensor state monitoring circuit 109 during fault diagnosis monitors the state of the sensors SS1, SS2, ..., SSn that are separated from the security device main body, instead of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) during fault diagnosis. The detection signal output from the sensor state monitoring circuit 109 during fault diagnosis is supplied directly to the communication unit 105. This makes it possible to report to a specified reporting destination even if a detection signal is generated in the sensor state monitoring circuit 109 during fault diagnosis.

[0040] The control unit 150A is a microprocessor including a CPU, ROM, RAM, non-volatile memory, etc., and basically controls each unit of the security device 100A in the same manner as the control unit 150 of the security device 100 of the first embodiment. In particular, the control unit 150A can control switching of the second switching circuits 108(1)-108(n) in addition to the first switching circuits 102(1)-102(n) and output switching circuits 104(1)-104(n) described above.

[0041] In the security device 100A of the second embodiment, when in security mode, the first switching circuits 102(1), 102(2), ..., 102(n) are switched to the terminal a side. Also, the output switching circuits 104(1), 104(2), ..., 104(n) are set to be in the on state. Furthermore, the second switching circuits 108(1), 108(2), ..., 108(n) are switched to the terminal b side. As a result, the output signals from the sensors SS1, SS2, ..., SSn are supplied to the sensor status monitoring circuits 103(1), 103(2), ..., 103(n), and when an abnormality is detected, a report is immediately sent via the communication unit 105.

[0042] In the security device 100A of the second embodiment having such a configuration, for example, a case where the sensor state monitoring circuit 103(1) is diagnosed will be considered. In this case, as shown in FIG. 3, the control unit 150A switches the first switching circuit 102(1), which is a circuit unit corresponding to the sensor state monitoring circuit 103(1), to the terminal b side and switches the output switching circuit 104(1) to the off state. In addition, the control unit 150A switches the second switching circuit 108(1) to the terminal a side. Therefore, the sensor SS1 is connected to the sensor state monitoring circuit 109 being diagnosed, not to the sensor state monitoring circuit 103(1) to be diagnosed. After this, the control unit 150A controls the diagnostic signal generating circuit 106 to generate and output a diagnostic signal.

[0043] As a result, the diagnostic signal from the diagnostic signal generating circuit 106 is supplied to the sensor state monitoring circuit 103(1) through the first switching circuit 102(1). The sensor state monitoring circuit 103(1) forms a detection signal in response to the diagnostic signal in the same manner as when an abnormality is detected in the sensor SS1, and outputs the detection signal. As described above, since the output switching circuit 104(1) is in the off state, the detection signal from the sensor state monitoring circuit 103(1) is supplied only to the control unit 150A, and is not supplied to the communication unit 105. Therefore, no notification is made to a security company or the like, and the control unit 150A determines whether the sensor state monitoring circuit 103(1) is functioning normally.

[0044] That is, in this example, when the sensor state monitoring circuit 103(1) functions normally, the sensor state monitoring circuit 103(1) forms and outputs a detection signal in response to the diagnostic signal from the diagnostic signal generating circuit 106. Therefore, when the detection signal is normally output from the sensor state monitoring circuit 103(1), the control unit 150A determines that the sensor state monitoring circuit 103 is functioning normally. Conversely, assume that the sensor state monitoring circuit 103(1) does not output a detection signal even though the diagnostic signal from the diagnostic signal generating circuit 106 is supplied to the sensor state monitoring circuit 103. In this case, since the detection signal is not supplied from the sensor state monitoring circuit 103(1) to the control unit 150A, the control unit 150 determines that the sensor state monitoring circuit 103 is not functioning normally (has broken down).

[0045] In the case of the security device 100A of the second embodiment, as described above, the sensor SS1 to be connected to the sensor state monitoring circuit 103(1) to be diagnosed is connected to the sensor state monitoring circuit 109 during fault diagnosis. Therefore, if an abnormality is detected in the sensor SS1 during diagnosis of the sensor state monitoring circuit 103(1), an output signal from the sensor SS1 that becomes high level is supplied to the sensor state monitoring circuit 109 during fault diagnosis. The sensor state monitoring circuit 109 during fault diagnosis forms a detection signal and supplies it to the communication unit 105. As a result, even if an abnormality is detected in the sensor SS1 corresponding to the sensor state monitoring circuit 103(1) during diagnosis, it is possible to report it to a predetermined reporting destination without missing it.

[0046] The above is a response when diagnosing the sensor state monitoring circuit 103(1), but the same process is performed in order for the sensor state monitoring circuits 103(2), ..., 103(n). That is, the first switching circuits 102(1), 102(2), ..., 102(n), the output switching circuits 104(1), 104(2), ..., 104(n), and the second switching circuits 108(1), 108(2), ..., 108(n) are switched in order. This allows the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) to be sequentially diagnosed by supplying diagnostic signals to each of them in order.

[0047] Moreover, the sensors SS1, SS2, ..., SSn that should be connected to the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) that are the subject of diagnosis are connected to the sensor state monitoring circuit 109 during fault diagnosis. This makes it possible to report any abnormality that is detected in the sensors SS1, SS2, ..., SSn that correspond to the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) that are the subject of diagnosis, without missing any of the abnormality.

[0048] It is also possible to collectively diagnose all of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n). In this case, all of the first switching circuits 102(1), 102(2), ..., 102(n) are switched to the terminal b side. Also, all of the output switching circuits 104(1), 104(2), ..., 104(n) are turned off. Furthermore, the second switching circuits 108(1), 108(2), ..., 108(n) are switched to the terminal a side.

[0049] This allows for simultaneous diagnosis of the sensor status monitoring circuits 103(1), 103(2), ..., 103(n), and when an abnormality is detected in the sensors SS1, SS2, ..., SSn, it is possible to report it to a specified reporting destination without missing any of the abnormalities. However, it is difficult to identify which sensor detected the abnormality. For this reason, taking into consideration the load on the sensor status monitoring circuit 109 during the fault diagnosis, it is preferable to sequentially diagnose the sensor status monitoring circuits 103(1), 103(2), ..., 103(n).

[0050] <Example of Processing Performed by the Security Device 100A of the Second Embodiment> Fig. 4 is a flowchart for explaining the diagnostic process of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) performed in the security device 100A of the second embodiment. The process shown in Fig. 4 is executed by the control unit 150A of the security device 100A of the second embodiment. In the flowchart shown in Fig. 4, the same reference numerals are used for the process steps that are performed in the same way as in the flowchart shown in Fig. 2, and the description of the process steps will be brief.

[0051] 4, it is assumed that the first switching circuits 102(1), 102(2), ..., 102(n) are all switched to the terminal a side, the output switching circuits 104(1), 104(2), ..., 104(n) are all in the on state, and the second switching circuits 108(1), 108(2), ..., 108(n) are all switched to the terminal b side.

[0052] In the security device 100A of the second embodiment, when diagnosing the sensor state monitoring circuits 103(1), 103(2), ..., 103(n), the control unit 150A executes the diagnosis process shown in Fig. 4. After executing the diagnosis process shown in Fig. 4, the control unit 150A first initializes a variable x (step S101) and sets the variable x to an initial value of "1" (step S102). Next, the control unit 150A switches the second switching circuit 108(x) to the terminal a side (step S201).

[0053] Furthermore, the control unit 150A switches the first switching circuit 102(x) to the terminal b (step S103) and turns off the output switching circuit 104(x) (step S104). This enables the sensor state monitoring circuit 103(x) to be diagnosed, and the sensor SSx that has been disconnected from the sensor state monitoring circuit 103(x) is connected to the sensor state monitoring circuit 109 during the fault diagnosis, and monitoring continues.

[0054] Thereafter, the control unit 150A controls the diagnostic signal generating circuit 106 to generate and output a diagnostic signal (step S105). As a result, the diagnostic signal is supplied to the sensor state monitoring circuit 103(x) to be diagnosed through the first switching circuit 102(x), and if the sensor state monitoring circuit 103(x) is operating normally, a detection signal is formed and output. Therefore, the control unit 150A checks the output (detection signal) from the sensor state monitoring circuit 103(x) (step S106). As a result, it is possible to check (diagnose) whether the sensor state monitoring circuit 103(x) is operating normally.

[0055] Next, the control unit 150 switches the first switching circuit 108(x) to the terminal b side, switches the first switching circuit 102(x) to the terminal a side, and returns the output switching circuit 104(x) to the ON state (step S202). Next, the control unit 150 determines whether the variable x is the final value n or not (step S108). If it is determined in the determination process of step S108 that the variable x is not the final value, the control unit 150 adds a value of "1" to the variable x, repeats the process from step S201, and performs a diagnosis on the next sensor state monitoring circuit 103(x).

[0056] In the determination process of step S108, it is determined that the variable x is the final value. In this case, the control unit 150 outputs the confirmation results (diagnosis results) for all of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) (step S110), and ends the process of the flowchart shown in Fig. 4. Note that the result output process of step S110 can notify the diagnosis result to a reporting destination such as a security company via the communication unit 105, or output from a display or printer of a terminal device connected wirelessly or by wire to the control unit 150A, although not shown in Fig. 3.

[0057] Thus, in the case of the security device 100A of the second embodiment, in addition to the sensor state monitoring circuits 103(1), 103(2), ..., 103(n), a sensor state monitoring circuit 109 undergoing fault diagnosis is provided. This allows the sensors SS1, SS2, ..., SSn corresponding to the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) to be diagnosed to continue detecting the occurrence of an abnormality, and when an abnormality is detected, a report can be sent immediately to a specified reporting destination.

[0058] [Third embodiment] In the case of the security device 100A of the second embodiment described above, a sensor state monitoring circuit 109 undergoing fault diagnosis is provided separately from the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) to be diagnosed. This makes it possible for the security device 100A of the second embodiment to report even when an abnormality is detected in the sensors SS1, SS2, ..., SSn that are disconnected from the corresponding sensor state monitoring circuits 103(1), 103(2), ..., 103(n).

[0059] 1 and 3, a security device is generally connected to a number of sensors SS1, SS2, ..., SSn, and is therefore provided with a number of corresponding sensor status monitoring circuits 103(1), 103(2), ..., 103(n).The security device of the third embodiment therefore utilizes a sensor status monitoring circuit other than the sensor status monitoring circuit to be diagnosed (inspected), and is capable of issuing a report even when an abnormality is detected in a sensor that is disconnected from the corresponding sensor status monitoring circuit.

[0060] <Configuration Example of Security Device 100B According to Third Embodiment> Fig. 5 is a block diagram for explaining a configuration example of the security device 100B of the third embodiment. In the security device 100B shown in Fig. 5, the parts configured similarly to the security devices 100 and 100A of the first and second embodiments shown in Fig. 1 and Fig. 3 are given the same reference numerals, and detailed explanations of the parts are omitted to avoid duplication. As shown in Fig. 5, the security device 100B of the third embodiment is equipped with third switching circuits 111(1), 111(2), ..., 111(n) and fourth switching circuits 112(1), 112(2), ..., 112(n).

[0061] 5, the portion consisting of the sensor SS1, the third switching circuit 111(1), the fourth switching circuit 112(1), the first switching circuit 102(1), the sensor state monitoring circuit 103(1), and the output switching circuit 104(1) forms a single integrated signal line. Similarly, the portion consisting of the sensor SS2, the third switching circuit 111(2), the fourth switching circuit 112(2), the first switching circuit 102(2), the sensor state monitoring circuit 103(2), and the output switching circuit 104(2) forms a single integrated signal line. Also, the portion consisting of the sensor SSn, the third switching circuit 111(n), the fourth switching circuit 112(n), the first switching circuit 102(n), the sensor state monitoring circuit 103(n), and the output switching circuit 104(n) forms a single integrated signal line.

[0062] Therefore, from the viewpoint of the sensor SS1, the sensor state monitoring circuit 103(1) is a circuit of its own signal line, while the sensor state monitoring circuits 103(2), ..., 103(n) are circuits of other signal lines. In this way, there are other signal lines having a similar configuration to the own signal line. Taking advantage of this point, as described above, in the security device 100B of the third embodiment, when the sensor state monitoring circuit of the own signal line becomes the diagnosis target, the sensor state monitoring circuit of the other signal line is used to continue detecting and reporting the occurrence of an abnormality.

[0063] 5, the third switching circuits 111(1), 111(2), ..., 111(n) are provided between the sensor connection unit 101 and the fourth switching circuits 112(1), 112(2), ..., 112(n). In addition, the fourth switching circuits 112(1), 112(2), ..., 112(n) are provided between the third switching circuits 111(1), 111(2), ..., 111(n) and the first switching circuits 102(1), 102(2), ..., 102(n).

[0064] The third switching circuits 111(1), 111(2), ..., 111(n) switch the supply destination of the output signal from the sensors SS1, SS2, ..., SSn. There are two supply destinations, one is the terminal a of the first switching circuits 102(1), 102(2), ..., 102(n), and the other is the terminal b of the fourth switching circuits 112(1), 112(2), ..., 112(n). In other words, the third switching circuit 111(m) switches whether the output signal from the sensor SSm of its own signal line is supplied to the first switching circuit 102(m) of its own signal line or to the fourth switching circuits 112(1) to 112(n).

[0065] The fourth switching circuits 112(1), 112(2), ..., 112(n) switch whether or not the output signals from the sensors SS1, SS2, ..., SSn of the other signal paths are supplied to the terminals a of the first switching circuits 102(1), 102(2), ..., 102(n) of their own signal lines. In other words, the fourth switching circuits 112(1), 112(2), ..., 112(n) switch whether or not the output signals of the sensors from the other signal lines are supplied to the first switching circuits of their own signal lines.

[0066] The control unit 150B is a microprocessor including a CPU, ROM, RAM, non-volatile memory, etc., and basically controls each part of the security device 100B in the same manner as the control unit 150 of the security device 100 of the first embodiment. In particular, the control unit 150B can control switching between the third switching circuits 111(1), 111(2), ..., 111(n) and the fourth switching circuits 112(1), 112(2), ..., 112(n).

[0067] In the security device 100B of the third embodiment, when in security mode, the first switching circuits 102(1), 102(2), ..., 102(n) are switched to the terminal a side. In addition, the output switching circuits 104(1), 104(2), ..., 104(n) are set to be in the on state. Furthermore, the third switching circuits 111(1), 111(2), ..., 111(n) are switched to the terminal b side, and the fourth switching circuits 112(1), 112(2), ..., 112(n) are switched to the terminal a side. As a result, the output signals from the sensors SS1, SS2, ..., SSn are supplied to the sensor state monitoring circuits 103(1), 103(2), ..., 103(n), and when an abnormality is detected, a report is immediately sent via the communication unit 105.

[0068] In the security device 100B of the third embodiment having such a configuration, for example, a case where the sensor state monitoring circuit 103(1) is diagnosed will be considered. In this case, as shown in FIG. 5, the control unit 150B switches the first switching circuit 102(1), which is a circuit unit corresponding to the sensor state monitoring circuit 103(1), to the terminal b side, and switches the output switching circuit 104(1) to the off state. The control unit 150B also switches the third switching circuit 111(1) to the terminal a side. Furthermore, the control unit 150B switches the fourth switching circuits 112(2), ..., 112(n) other than the fourth switching circuit 112(1) to the terminal b side.

[0069] Therefore, the sensor SS1 is connected to the terminal b of the fourth switching circuit 112(2), ..., 112(n) through the third switching circuit 111(1), and through these, is connected to the first switching circuits 102(2), ..., 102(n). As a result, the output signal from the sensor SS1 is supplied to the sensor state monitoring circuits 103(2), ..., 103(n) on the other signal paths, rather than to the sensor state monitoring circuit 103(1) to be diagnosed. Thereafter, the control 150B controls the diagnostic signal generating circuit 106 to generate and output a diagnostic signal.

[0070] As a result, the diagnostic signal from the diagnostic signal generating circuit 106 is supplied to the sensor state monitoring circuit 103(1) through the first switching circuit 102(1). The sensor state monitoring circuit 103(1) forms a detection signal in response to the diagnostic signal in the same manner as when an abnormality is detected in the sensor SS1, and outputs the detection signal. As described above, since the output switching circuit 104(1) is in the off state, the detection signal from the sensor state monitoring circuit 103(1) is supplied only to the control unit 150B, and is not supplied to the communication unit 105. Therefore, no notification is sent to a security company or the like, and the control unit 150B determines whether the sensor state monitoring circuit 103(1) is functioning normally.

[0071] That is, when the sensor state monitoring circuit 103 functions normally, the sensor state monitoring circuit 103 forms and outputs a detection signal in response to a diagnostic signal from the diagnostic signal generating circuit 106. Therefore, when a detection signal is normally output from the sensor state monitoring circuit 103(1), the control unit 150B determines that the sensor state monitoring circuit 103 is functioning normally. Conversely, the control unit 150B determines that a detection signal is not output from the sensor state monitoring circuit 103(1) even though a diagnostic signal from the diagnostic signal generating circuit 106 is supplied to the sensor state monitoring circuit 103. In this case, since a detection signal is not supplied from the sensor state monitoring circuit 103(1) to the control unit 150B, the control unit 150 determines that the sensor state monitoring circuit 103 is not functioning normally (has broken down).

[0072] In the security device 100B of the third embodiment, when the sensor state monitoring circuit 103(1) is the diagnosis target, the output signal from the sensor SS1 is supplied to the sensor state monitoring circuits 103(2), ..., 103(n) of the other signal lines. As a result, even if the sensor state monitoring circuit 103(1) is being diagnosed, if an abnormality is detected in the sensor SS1, it can be reported to a predetermined reporting destination via the sensor state monitoring circuits 103(2), ..., 103(n).

[0073] The above is a response when diagnosing the sensor state monitoring circuit 103(1), but the same process is performed in order for the sensor state monitoring circuits 103(2), ..., 103(n). That is, in the security device 100B of the third embodiment, the first switching circuits 102(1), 102(2), ..., 102(n) and the output switching circuits 104(1), 104(2), ..., 104(n) are switched in order. At the same time, in the security device 100B, the third switching circuits 111(1), 111(2), ..., 111(n) and the fourth switching circuits 112(1), 112(2), ..., 112(n) are also switched in order.

[0074] As a result, the diagnostic signals are supplied to the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) in order, and the diagnostics can be performed in order. Moreover, the sensors SS1, SS2, ..., SSn that should be connected to the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) to be diagnosed are connected to the sensor state monitoring circuits of the other signal paths. As a result, even if an abnormality is detected in the sensor corresponding to the sensor state monitoring circuit to be diagnosed, it can be reported without missing it. Moreover, there is no need to separately provide a sensor state monitoring circuit 109 during failure diagnosis, as in the security device 100A of the second embodiment.

[0075] In the case of the security device 100B of the third embodiment, the sensor SSm output signal corresponding to the sensor state monitoring circuit 103(m) to be diagnosed is supplied to the sensor state monitoring circuits 103(1)-103(n) of the other signal lines other than the sensor state monitoring circuit 103(m). This makes it possible to complement any malfunction occurring among the sensor state monitoring circuits 103(1)-103(n) of the multiple other signal lines, and to report the occurrence of an abnormality to a specified reporting destination.

[0076] Of course, the sensor state monitoring circuit to which the output signal of the sensor SSm corresponding to the sensor state monitoring circuit 103(m) to be diagnosed is supplied may be one or more as appropriate. Also, initially, there are a plurality of sensor state monitoring circuits 103 to which the output signal of the sensor corresponding to the sensor state monitoring circuit 103(m) to be diagnosed is supplied. However, after that, it is also possible to select only one sensor state monitoring circuit 103 that has been diagnosed and is operating properly, and control the selection so that the output signal of the sensor SSm corresponding to the sensor state monitoring circuit 103(m) to be diagnosed is supplied to this sensor state monitoring circuit.

[0077] It is also possible to collectively diagnose a plurality of sensor state monitoring circuits 103(1), 103(2), ..., 103(n). In this case, a plurality of first switching circuits 102 corresponding to a plurality of sensor state monitoring circuits 103 to be diagnosed are switched to the terminal b side, and a plurality of corresponding output switching circuits 104 are turned off. Furthermore, a plurality of third switching circuits 111 corresponding to a plurality of sensor state monitoring circuits 103 to be diagnosed are switched to the terminal a side, and a fourth switching circuit 112(1) to 114(n) are switched to the terminal b side. The state of each switching circuit of a signal line to which a sensor state monitoring circuit 103 not to be diagnosed belongs is kept as it is in the normal monitoring state. This allows a plurality of sensor state monitoring circuits to be diagnosed collectively.

[0078] However, it is necessary to easily and accurately determine which sensor state monitoring circuit 103(1), 103(2), ..., 103(n) is experiencing a failure. For this reason, taking into consideration the load on the sensor state monitoring circuit 109 during failure diagnosis, a method of sequentially diagnosing the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) is preferable.

[0079] <Example of Processing Performed by the Security Device 100B of the Third Embodiment> Fig. 6 is a flowchart for explaining the processing of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) performed in the security device 100B of the third embodiment. The diagnosis processing shown in Fig. 6 is processing executed by the control unit 150B of the security device 100B of the third embodiment. In the flowchart shown in Fig. 6, the processing steps performed in the same manner as in the flowchart shown in Fig. 2 are given the same reference numerals, and the description of the processing steps will be brief.

[0080] 6, it is assumed that the first switching circuits 102(1), 102(2), ..., 102(n) are all switched to the terminal a side, and the output switching circuits 104(1), 104(2), ..., 104(n) are all in an on state. It is also assumed that the third switching circuits 111(1), 111(2), ..., 111(n) are all switched to the terminal b side, and the fourth switching circuits 112(1), 112(2), ..., 112(n) are all switched to the terminal a side.

[0081] In the security device 100B of the third embodiment, when diagnosing the sensor state monitoring circuits 103(1), 103(2), ..., 103(n), the control unit 150B executes the diagnosis process shown in Fig. 6. After executing the diagnosis process shown in Fig. 6, the control unit 150B first initializes a variable x (step S101) and sets the variable x to an initial value of "1" (step S102). Next, the control unit 150B switches the third switching circuit 111(x) to the terminal a side (step S301).

[0082] Furthermore, the control unit 150B switches the fourth switching circuits 112(1) to 112(n) other than the fourth switching circuit 112(x) to the terminal b side (step S302). For example, when the variable x is a value "1", the process of step S302 switches the fourth switching circuits 112(2), ..., 112(n) other than the fourth switching circuit 112(1) to the terminal b side.

[0083] Furthermore, the control unit 150B switches the first switching circuit 102(x) to terminal b (step S103) and turns off the output switching circuit 104(x) (step S104). This enables diagnosis of the sensor state monitoring circuit 103(x), and the sensor SSx separated from the sensor state monitoring circuit 103(x) is connected to a sensor-like monitoring circuit on another signal line to continue monitoring.

[0084] Thereafter, the control unit 150B controls the diagnostic signal generating circuit 106 to generate and output a diagnostic signal (step S105). As a result, the diagnostic signal is supplied to the sensor state monitoring circuit 103(x) to be diagnosed through the first switching circuit 102(x), and if the sensor state monitoring circuit 103(x) is operating normally, a detection signal is formed and output. Therefore, the control unit 150B checks the output (detection signal) from the sensor state monitoring circuit 103(x) (step S106). As a result, it is possible to check (diagnose) whether the sensor state monitoring circuit 103(x) is operating normally.

[0085] Next, the control unit 150B restores the third switching circuit 111(x), the fourth switching circuits 112(1)-112(n), the first switching circuit 102(x), and the output switching circuit 104(x) to their original states (step S303). Next, the control unit 150B determines whether the variable x is the final value n (step S108). When it is determined in the determination process of step S108 that the variable x is not the final value, the control unit 150B adds a value of "1" to the variable x (step S109), and repeats the process from step S301 to diagnose the next sensor state monitoring circuit.

[0086] In the determination process of step S108, it is determined that the variable x is the final value. In this case, the control unit 150B outputs the confirmation results (diagnosis results) for all of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) (step S110), and ends the process of the flowchart shown in Fig. 6. Note that the result output process of step S110 can notify the diagnosis result to a reporting destination such as a security company through the communication unit 105, or output from a display or printer of a terminal device connected wirelessly or by wire to the control unit 150B, although not shown in Fig. 5.

[0087] In this way, in the case of the security device 100B of the third embodiment, the output signal of the sensor corresponding to the sensor state monitoring circuit being diagnosed is monitored by a sensor state monitoring circuit of another signal line (another signal line). This makes it possible to immediately report to a specified reporting destination even if an abnormality is detected in the sensor corresponding to the sensor state monitoring circuit being diagnosed.

[0088] [Effects of the embodiment] The diagnosis of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) can be performed simply and appropriately without the intervention of the sensors SS1, SS2, ..., SSn that detect the occurrence of an abnormality. The diagnosis of the sensor state monitoring circuits 103(1) to 103(n) is equivalent to the diagnosis of the entire input circuit section including the diagnostic signal generating circuit 106, the transistor 107, and the first switching circuits 102(1) to 102(n). This is because if the diagnostic signal generating circuit 106, the transistor 107, and the first switching circuits 102(1) to 102(n) are not functioning normally, the diagnosis of the sensor state monitoring circuits 103(1), 103(2), ..., 103(n) cannot be performed.

[0089] Similarly, in the case of the second embodiment described above, the diagnosis of the sensor state monitoring circuits 103(1)-103(n) is equivalent to the diagnosis of the input circuit section including the second switching circuits 108(1)-108(n). In addition, in the case of the third embodiment described above, the diagnosis of the sensor state monitoring circuits 103(1)-103(n) is equivalent to the diagnosis of the input circuit section including the third switching circuits 111(1)-111(n) and the fourth switching circuits 112(1)-112(n).

[0090] In the case of the security devices 100A and 100B of the second and third embodiments, even if an abnormality is detected by the sensor corresponding to the sensor state monitoring circuit to be diagnosed, it is possible to report the abnormality to a predetermined reporting destination. In other words, the diagnostic process can be prevented from interfering with the detection and reporting of the occurrence of an abnormality.

[0091] [Variations] In the above-described embodiment, the output of the diagnosis results of the sensor state monitoring circuits 103(1)-103(n) has been described as being displayed on a display of a terminal device connected to the control units 150, 150A, 150B, or output from a printer. However, this is not limited to this. Report information to which information indicating that it is a diagnosis result is added may be sent to a predetermined report destination, so that the report destination can grasp the diagnosis result. In this case, the output switching circuits 104(1)-104(n) may not be provided.

[0092] Also, the diagnostic results can be compiled in the control units 150, 150A, 150B and sent to a predetermined management destination such as a predetermined reporting destination, so that measures can be taken if a malfunction occurs.

[0093] Furthermore, the diagnostic processing of the sensor state monitoring circuits 103(1)-103(n) can be performed periodically under the control of the control units 150, 150A, 150B. Of course, the diagnostic processing can also be performed at an appropriate timing by directly instructing the security devices 100, 100A, 100B to execute the diagnostic processing through an operation unit connected to the control units 150, 150A, 150B. Also, for example, the diagnostic processing can be performed periodically or as needed in response to remote control from a specified reporting destination.

[0094] Also, it is possible to diagnose (check) only the communication unit 105, separately from the sensors SS1 to SSn and the sensor state monitoring circuits 103(1) to 103(n), as to whether or not it is functioning normally.

[0095] [others] As can be seen from the above description of the embodiment, the function of the diagnostic signal generating circuit in the claims is realized by the diagnostic signal generating circuit 106 of the security device 100, 100A, 100B of the embodiment. The function of the first switching circuit in the claims is realized by the first switching circuits 102(1), 102(2), ..., 102(n) of the security device 100, 100A, 100B of the embodiment. The function of the discrimination unit in the claims is realized by the control units 150, 150A, 150B of the security device 100, 100A, 100B of the embodiment. The function of the second switching circuit in the claims is realized by the second switching circuits 108(1), 108(2), ..., 108(n) of the security device 100A of the embodiment. The function of the sensor state monitoring circuit during diagnosis in the claims is realized by the sensor state monitoring circuit during fault diagnosis 109 of the embodiment.

[0096] The function of the third switching circuit in the claim is realized by the third switching circuit 111(1), 111(2), ..., 111(n) of the security device 100B of the embodiment. The function of the fourth switching circuit in the claim is realized by the fourth switching circuit 112(1), 112(2), ..., 112(n) of the security device 100B of the embodiment. In addition, the function of the first control unit in the claim is realized by the control units 150, 150A, 150B of the security devices 100, 100A, 100B of the embodiment. The function of the second control unit in the claim is realized by the control unit 150A of the security device 100A of the embodiment, and the functions of the third control unit and the fourth control unit in the claim are realized by the control unit 150B of the security device 100B of the embodiment. [Explanation of symbols]

[0097] 100, 100A, 100B... security device, SS1, SS2, ..., SSn... sensor, 101... sensor connection section, 102(1), 102(2), ..., 102(n)... first switching circuit, 103(1), 103(2), ..., 103(n)... sensor status monitoring circuit, 104(1), 104(2), ..., 104(n)... output switching circuit, 105... communication section, 106... diagnostic signal generating circuit, 107... transistor, 108(1), 108(2), ..., 108(n)... second switching circuit, 109... sensor status monitoring circuit during fault diagnosis, 111(1), 111(2), ..., 111(n)... third switching circuit, 112(1), 112(2), ..., 112(n)... fourth switching circuit

Claims

1. A security device equipped with a sensor state monitoring circuit that monitors an output signal from a sensor that detects the occurrence of an abnormality and notifies a predetermined notification destination when the occurrence of an abnormality is detected, a diagnostic signal generating circuit for generating a diagnostic signal; a first switching circuit that switches whether the output signal from the sensor or the diagnostic signal from the diagnostic signal generating circuit is to be supplied to the sensor state monitoring circuit; A first control unit that controls switching of the first switching circuit; a discrimination unit that discriminates whether the sensor state monitoring circuit is normal or abnormal based on an output signal from the sensor state monitoring circuit when the first control unit switches the first switching circuit to supply the diagnostic signal to the sensor state monitoring circuit; a circuit for monitoring an output signal from the sensor during diagnosis, and notifying a predetermined destination when an abnormality is detected; a second switching circuit that switches whether the output signal from the sensor is supplied to the diagnostic-in-progress sensor state monitoring circuit or the first switching circuit; a second control unit that controls switching of the second switching circuit; Equipped with When the first control unit switches the first switching circuit to supply the diagnostic signal to the sensor state monitoring circuit, the second control unit switches the second switching circuit to supply the output signal from the sensor to the diagnostic sensor state monitoring circuit. A security device characterized by:

2. A security device as claimed in claim 1, By providing a plurality of the sensors, a signal line including the sensor state monitoring circuit, the first switching circuit, and the second switching circuit is formed for each of the sensors, the first control unit is capable of switching control for each of the first switching circuits of the signal lines, The second control unit is capable of switching control for each of the second switching circuits of the signal lines. A security device characterized by:

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