JPH0358200A - Central monitoring equipment - Google Patents

Abstract

PURPOSE:To prevent erroneous warnings which are frequently produced at a service interruption by adding a service interruption detection means and a warning suppression means to an equipment connected to a peripheral device such as an intrusion sensor via a B contact type. CONSTITUTION:A central monitor equipment is prepared in a crime/fire prevention system containing a connection constitution of a B contact type where a current set based on the power supply is always flowing on the connection line set between an intrusion sensor 1 and a fire sensor 2 and the state changes are always monitored for the detection signals of both sensors 1 and 2. A service interruption detection means 7 is added to the central monitor equipment to monitor the power supply state of a power unit 6 and to automatically detect a service interruption together with a warning suppression means 8 which stops the warning deciding action during the service interruption. Thus the transmission of a warning 19 is suppressed at occurrence of a service interruption after the supply of current is stopped to the signal line set between sensors 1 and 2 and the abnormality is detected. As a result, it is possible to prevent the erroneous warnings which are produced when a power supply is cut off.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a central monitoring device that detects and issues an alarm for a crime prevention and disaster prevention system that monitors intrusions, fires, and the like.

[Conventional technology]

Figure 5 shows a conventional central monitoring device. This central monitoring device constantly inputs detection signals from intrusion sensors (1) connected to peripheral devices, fire sensors (2), etc., and monitors its status. A signal change detection means (3) for detecting a change, an alarm generation means (4) for generating a necessary alarm based on the state change detection signal, and an alarm display means for notifying the outside of the alarm. (5), where the connection between the intruder sensor (1), the fire sensor (2), and the central monitoring device is such that current always flows through the connection wire, It has a B contact type connection configuration in which a sensor abnormality is detected by the central monitoring device when the connection line is disconnected.

Next, the operation will be explained.

Many of the intrusion sensors (1) and fire sensors (2) necessary for the crime prevention and fire system are installed in the surrounding area, and signal lines that can detect the status of each sensor are connected from these devices to the central monitoring device, and signal changes can be detected. The means (3) constantly checks whether the detection signals have changed, and when the signal change detection means (3) detects a change in the signal that changes the state in the event of an intrusion or a fire, the alarm activation means ( 4) creates an intrusion or fire alarm based on the content of the change.

The alarm data includes location information, type, date and time of occurrence, etc., and the data is passed to the alarm display means (5) and displayed on a CRT or the like, and at the same time an external buzzer or the like is sounded to notify outsiders of the emergency situation.

[Problems to be Solved by the Invention] As mentioned above, in order to further increase the security level, conventional central monitoring devices require that current constantly flows through the connection wires when connecting peripheral devices such as sensors. The connection configuration is a B contact type so that even if the wire is disconnected, it can be detected in the same way as an abnormality in the sensor, so if the power supply to the peripheral device is cut off, the current in the connecting wire will stop flowing. The problem is that the central monitoring device considers the sensor to be abnormal and issues an alarm to all sensors, causing confusion for the operator.

This invention was made in order to solve the above-mentioned problems, and for alarm monitoring of peripheral devices such as sensors that are connected with a B contact type connection structure, it is possible to avoid problems when the power supply is cut off. The purpose of the present invention is to provide a central monitoring device that can prevent erroneous alarms from occurring at times and avoid confusion for operators.

[Means for Solving the Problems] The central monitoring device according to the present invention has a current flowing through the connection line between the intrusion sensor and the fire sensor based on the constant power supply, and constantly monitors changes in the state of the detection signals of the sensors. In a central monitoring device of a crime prevention and disaster prevention system having a monitoring B contact type connection configuration, there is provided a power outage detection means for detecting a power outage of the power source, and a power outage detection means for detecting a power outage of the power supply, and a device that prevents false alarms from being issued when the power supply to the sensor is cut off. The system is equipped with an alarm detection and suppression means.

(Function) In this invention, when a power outage occurs, the current in the signal connection line of the peripheral sensor is stopped by the power outage detection means and the alarm suppression means, thereby suppressing the occurrence of a large number of alarms due to the detection of an abnormality. .

(Example) Hereinafter, the present invention will be explained with reference to FIG. 1, in which the same parts as in FIG. 5 are denoted by the same reference numerals. In Figure 1, (
6) is a power supply device that supplies power to each sensor of peripheral equipment, and (7) is a power outage detection device that monitors the state of the power supply of the power supply device (6) and automatically detects a power outage. The means (8) is an alarm suppressing means for transmitting an alarm suppressing signal to stop the alarm judgment operation during the power outage detection period.
9) stops the alarm judgment operation based on the alarm suppression means, and always generates an intrusion and fire alarm based on the location and content of the change based on the detection signal of the signal change detection means (3) and notifies the outside of the content. This is an alarm judgment means.

FIG. 2 is a hardware configuration diagram of a central monitoring device having the above configuration, and this central monitoring device includes a CPU (11), a
A display control circuit (12) that displays and controls the RT (13), a ROM (14) in which programs are written, a RAM (15) that stores sensor status, etc., and a clock IC that retrieves the alarm occurrence time. (16), and an input/output circuit (18) that receives status signals from peripheral sensors and current analog signals from the power supply (6) via the A/D converter (17). Note that (l9) is a buzzer.

Next, the operation of the program incorporated in the ROM (14) of the central monitoring device will be explained based on FIGS. 3 and 4 showing the main operation flowcharts.

When detecting a signal change in Fig. 3, first, at the time when a signal change occurs (Sl), the contact type of the changed signal is A.
Check whether the signal is based on the contact type (always OFF (no power supply) and ON when an error occurs (with current)) or the signal based on the B contact type (always ON and OFF when an error occurs) (S2). If there is, it changes from OFF to ON (S3) or if it is an A contact type signal, it changes from ON to OFF.
When changing to FF (S4), the process moves to the following alarm determination creation process.

That is, the location information and content of the changed signal are extracted (S5), and the current date and time is extracted as the alarm occurrence time.
(S6). Next, check the state of the power outage flag set in the power outage detection process (S7), and if it is OFF, create alarm data with attributes such as occurrence location, content, date and time at the time of normal alarm operation fA processing (S8 ) and sound the alarm buzzer (s
9) Display the generated alarm data on an external display such as a CRT (510) Also, when the power outage flag is ON, a B contact type signal alarm is sent to turn off the contact of the sensor when a power outage occurs. In order to suppress false alarms, normal alarm generation processing is not performed, and only the current occurrence change data is registered in the alarm suppression queue (Sll).In addition, in the power outage detection processing shown in Figure 4, peripheral sensor The output current value of the power supply device that supplies operating power to the device is constantly monitored (Sl), and if the current value falls below the specified value (S
2) assumes that a power outage has occurred and turns on the power outage flag (S
3).

Also, after a power outage occurs (power outage flag ON state) (54)
When the current value returns to the normal value, power restoration processing is performed.However, as a condition for determining restoration, a time delay is set for the current value to stabilize and for the operation of peripheral devices to stabilize to prevent chattering, etc. (S5). As a power restoration process, the alarm suppression queue data is retrieved (S6), the current signal state of the retrieved sensor is checked (S7), and whether it is in a significant state (if it is a B contact, it is in the OFF state; if it is an A contact, it is in the ON state). For example, if the state of intrusion is truly abnormal,
Immediately create alarm data and display it on a CRT, etc. (S8)
. If it is an unexpected state, the power failure flag is turned back to OFF (S9) and the process moves to monitoring the power supply output current again.

In addition, in the above example, the central monitoring device for a crime prevention and disaster prevention system is connected to an intrusion sensor and a fire sensor as peripheral devices, but the conditions and high level of output signal contacts of devices connected in a building management system etc. When a B-contact type signal interface is used for devices that require high security, there is a problem in that false alarms occur frequently, similar to when the power goes down. It can be solved in the same way if used.

〔Effect of the invention〕

As described above, according to the present invention, when the power supply to the sensor is cut off, the central monitoring device, which is connected to the peripheral equipment such as the intrusion sensor using the B contact type, is equipped with a power failure detection means and a false alarm. Since the system incorporates an alarm suppression means that prevents the occurrence of false alarms during power outages, it is possible to prevent false alarms from occurring frequently during power outages, making it possible to realize a more reliable system.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a structural diagram of one embodiment of the present invention, Fig. 2 is a hardware structural diagram of Fig. 1, and Figs. 3 and 4 are RO! FIG. 5 is a block diagram of a conventional central monitoring device. In the figure, (1) is an intrusion sensor, (2) is a fire sensor, and (3) is a fire sensor.
) is a signal change detection means, (5) is an alarm display means, (6)
is a power supply device, (7) is a power failure detection means, and (8) is an alarm suppression means. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In the central monitoring device of a crime prevention and disaster prevention system, which has a B contact type connection configuration, in which a current based on the power supply is constantly flowing on the connection line between the intrusion sensor and the fire sensor, and changes in the state of the detection signal of the sensor are constantly monitored. A central monitoring device comprising: a power outage detection means for detecting a power outage of the power supply; and an alarm detection suppression means for preventing false alarms from being issued when the power supply to the sensor is cut off.