JPS61199196A - Receiver for alarm - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a fire alarm system using an analog sensor,
Regarding receivers for alarm devices such as gas leak alarm devices, the present invention provides an alarm system that is particularly responsive to variations in each analog sensor.

"Prior Art" Conventionally, in an alarm device in which a receiver and a plurality of analog sensors are connected through a transmission line, the receiver calls the analog sensor at predetermined intervals, and each called analog sensor detects temperature and smoke concentration. The return data indicating the analog quantity, etc., is sent back to the receiver, and the receiver receives this return data to determine whether there is an environmental abnormality such as the occurrence of a fire. When setting the reference value for determining this abnormality, we take into account the variation in detection sensitivity of each analog sensor, and set it based on the average value of multiple returned data instead of a fixed value. Correction of reference values due to nasal changes,
There is an alarm device that corrects a reference value using an average value within a period that is set longer than the period that indicates the phenomenon of environmental abnormality. For example, Japanese Utility Model Application Publication No. 59-118088.

``Problem to be solved by the invention'' With such conventional alarm devices, when the environment is unstable, for example, when there is smoke at the scene of a smoke sensor, it is treated as one patch noise at the time of initial setting. , the standard value for the sensor installed at the site will be set to extremely low sensitivity, and if the standard value is corrected indefinitely due to aging of the sensor, it will deviate from the normal detection range of the sensor. However, monitoring under such conditions does not maintain the reliability of the system.

"Means for solving the problem" The receiver of the alarm device of the present invention sets a reference value for determining environmental abnormality corresponding to each analog sensor, and the initial setting of this reference value or correction due to aging is not possible. , means for setting a plurality of average values or minimum values of data returned by the sensor as a reference value as is if it is within a predetermined range, and provisionally setting a predetermined fixed value if it is outside the range;
It also includes a display section that displays a setting failure when a fixed value is set.

``Function'' The display of a setting error can notify the need for on-site environmental confirmation or maintenance of the analog sensor.Also, even in the event of a setting error, an environmental abnormality can be determined based on a provisional fixed value. This can prevent major misreporting.

“Embodiment” As shown in FIG. 1, the alarm device of this invention has a receiver RC.
It consists of a transmission line l extending from this receiver RC to each caution area, and a plurality of analog sensors ASI to n connected to this transmission line l. The receiver RC includes a central processing unit MP such as a microprocessor, a ROM (!J-only, memory) in which processing programs, data, etc. are stored, and new data is stored.
A storage unit ME consisting of R, AM (random, access, memory), an interface IFP for operation display,
Operation part CN such as numeric keypad and operation switch, display part DS such as LED, buzzer, CRT, printing printer, etc., interface IFM for transmission, and analog sensor A
The device receiver C, which is composed of SI~n and a transmission section MD that transmits and receives signals, is a periodic VC analog sensor ASI~
Call n. Each called analog sensor AS
I to n send back data indicating analog quantities such as temperature and smoke concentration to the receiver Re. The returned data is received by the transmission section MD of the receiver RC and taken into the central processing unit MP via the interface IFM.

The central processing unit MP determines whether the returned data is normal or abnormal, and when an abnormality occurs, displays the area where the abnormality has occurred and the state of the abnormality on the display section DS.

When the power is turned on, reference values for determining environmental abnormality are initialized for each of the analog sensors A81 to A8n.

In this case, the storage unit ME and the central processing unit MP calculate an average value from data returned multiple times for one analog sensor ASI~n. Then, this average value is revised and stored in the memory M.
If it is within the range of the upper limit and lower limit set in E, this average value is stored in the reference value storage section. FIG. 2 shows this state. Further, if it is outside the range, a predetermined fixed value is temporarily stored in the reference value storage section. FIG. 3 shows this state. At this time, the central processing unit MP determines that the setting is defective and outputs a signal to the display section DS to display the setting defect and the addresses of the analog sensors ASI~n. Therefore, it is possible to notify the necessity of maintenance of the analog sensor As1-n which has caused a setting error and confirmation of the installation site.

During normal monitoring, each analog sensor ASI~n
The reference value is corrected based on the change over time. Depending on the type of analog sensor ASI~n, there are those whose analog values (return data) increase and those whose analog values (return data) decrease as time passes. Here, for example, a case will be described in which the output analog value in a steady state increases with time, as shown in FIG. 4, such as in a scattered light type smoke detector. The central processing unit MP corrects the reference value every time T (update time) that is longer than the phenomenon time (several minutes to about one hour) indicating an environmental abnormality. This corresponds to each analog sensor ASI~n, and stores the minimum value among a plurality of returned data within time T. If this minimum value is within the range of the newly set upper limit value and lower limit value, this minimum value is set as the reference value for the next period. (t shown in Figure 4)
The interval from 1 to t5. ) If f is outside the range, a predetermined fixed value is provisionally set as the reference value for the next period. (The interval t5-t6 shown in FIG. 4.) In this way, the reference value for determining environmental abnormality can be a value that is caused only by variations in each analog sensor ASI to n and changes over time. Furthermore, if a fixed value is set, a standard judgment will be made, so there will be no major missed report. As with the initial settings, any incorrect settings are displayed, allowing on-site confirmation and notification of the need for maintenance.

The minimum value is the average value (1
Assuming that the polling period of each sensor ASI~n is 5 seconds, the influence of electrical noise can be eliminated by registering it as an average value of analog values for 25 to 30 seconds.

In addition to electrical noise, for example, in smoke sensors, the output analog value (minimum value) usually differs due to temperature and other factors, even in the absence of smoke, due to differences in sensor structure and processing circuitry. Therefore, it is most preferable to set the reference value to be an intermediate value between the maximum value and the minimum value in a smoke-free state. Although it is impossible to calculate this on the receiver RC side from the returned data, it is possible to correct it from experimental data for each model of each analog sensor ASI~n.

Therefore, a more accurate reference value can be determined from the data storing the model of each analog sensor ASI~n in the storage unit MB on the receivers R and C side and the minimum value of the returned data. Simply using the minimum value as the reference value can prevent the sensitivity from becoming too high.

Next, the flowchart of the main operation of the receiver RC is shown in sections 5 to 7.
This will be explained based on the diagram.

The routine for initializing the reference value is shown in FIG. Step 8
10 indicates when the receiver RC is powered on. Step 811
Initialize the buffer etc. with , and set the sensor address S.
A is set to 1, the polling count count n is set to 1, and each reference value buffer LV (SA) is set to 0. Step 812 calls the sensor at the set address SA and requests return data, and inputs the return data E. Step 813 multiplies the newly acquired data RFi of a certain sensor by 1, adds this value to the contents of the reference value buffer Lv (SA) corresponding to this sensor, and newly adds this value to this reference value buffer. Store in LV (SA). Step 814 advances the sensor address SA one step.

In step 815, it is determined whether the address SA of the sensor installed in this system is greater than or equal to the last address. If NO, the process returns to step 812, and the same process is performed on the sensor having the next address SA.

If YES, the process advances to step 816. Step S16
advances the polling count count n by one step. Step 8
Step 17 determines whether the count value n is equal to or greater than a predetermined number of times N.

If NO, set address 5A=IK and step 81
Returning to step 2, the same data acquisition is performed N times for one sensor, and the average value of the N times of returned data RE is stored in the reference value LV (SA). If YES, proceed to step 818. @Step 81B sets the sensor address SA to 1. Step S19 sets the reference value buffer LV (
SA) is below a predetermined lower limit value LOW.

If YES, the process advances to step 821. If NO, proceed to step 820.

Step 820 determines whether the contents of the reference value buffer LV (SA) are greater than or equal to a predetermined upper limit value HIGH. If YES, the process advances to step S21. If NO, step 823
Proceed to. Step 821 outputs a warning about the reference value setting failure, and displays the occurrence of the setting failure and the address of the sensor or the location where the setting failure occurred on the display section DS. Step 822 fixes the standard value to the reference value buffer LV (SA), (1]i
MIDLE is stored and the process advances to step 823. Step 3
23 advances address 8A one step. Step 324 determines whether address SA is greater than or equal to the final address. If NO, the process returns to step 819, and similar processing is performed on the reference value buffer LV(SA) corresponding to the next address SA. If YES, the process proceeds to the monitoring routine shown in FIG.

FIG. 6 shows a normal monitoring routine, and this routine is entered after the initial setting routine shown in FIG. 5 is performed. Step 825 sets the sensor address SA to 1. Step S26 calls the sensor at the set address SA, requests return data, and sends data R,
Take in H. Step S27 is step 82
The data RE captured in step 6 is the minimum value buffer MIN.
Determine whether the value is smaller than the content of (SA). YE
If S, the process advances to step 828; if NO, the process advances to step 829. Step 828 stores the data RE in the minimum value buffer MIN(SA), updates the minimum value buffer, and proceeds to step 829. In step 829, it is determined whether the sensor return data E is larger than a predetermined value α based on the contents of the corresponding reference value buffer LV(SA). This is to determine whether an environmental abnormality has occurred. If YES, proceed to step 830;
If it is O, the process advances to step 831. Step S30 is a step of outputting an alarm by driving the display DS to display the area where the abnormality has occurred and the state of the abnormality. Step 831
takes the sensor's address SA one step further.

Step 832 determines whether the sensor address SA is greater than or equal to the final address, and if NO, step 826
The process returns to and the same process is performed on the sensor having the next address 8A. If YES, the process advances to step 833. Although step 833 is not shown in FIG. 1, it is determined whether a certain period of time (update time) has elapsed by checking the status of the hard timer. If No, the process returns to step 825 and the monitoring state continues. If YES, the process proceeds to the correction routine shown in FIG.

FIG. 7 shows a reference value correction routine, step 834.
sets the sensor address SA to 1.

Step 835 is shown in FIG. 6 and stores the updated contents of the minimum value buffer MIN(SA) in the reference value buffer LV(SA). Step 836 is the reference value buffer LV
It is determined whether the content of (SA) is less than or equal to a predetermined lower limit value LOW.

If YES, the process advances to step 838. If NO, the process advances to step 837. In step 837, it is determined whether the contents of the reference value buffer LV (SA) are greater than or equal to a predetermined upper limit value HIGH. If YES, the process advances to step 838.

If NO, the process advances to step S40. Step 838 outputs a warning of a reference value setting failure, and displays the occurrence of the setting failure and the location where the setting failure occurred. Step 839 stores a predetermined fixed value MIDLE in the reference value buffer LV (SA), and the process proceeds to step 840. Step 840 temporarily stores the high/bell value MAX in the minimum value buffer MIN (SA) and clears the buffer. Step 841 advances the sensor address SA one step. Step 842 determines whether address SA is greater than or equal to the final address.

If No, step 835 returns K to next address SA
Correct the reference value buffer LV(SA) corresponding to . If YES, the process returns to step 825 shown in FIG.
Moving on to the monitoring routine again.

This reference value correction routine is performed at regular intervals by a hard timer. The certain period of time is set longer than the period of time that indicates the phenomenon of environmental abnormality.

Therefore, the correction of the reference value is not affected by abnormal phenomena. In addition, the reference value is corrected by directly using the minimum value of the previous input data R and E within a certain period of time as the reference value, but it can be made more accurate by correcting the minimum value from data that stores the sensor model, etc. It is possible to set a standard value.

"Effects of the Invention" As explained above, the receiver of the alarm device of the present invention is used in an alarm system that determines reference values for determining environmental abnormalities in response to variations and aging of each analog sensor. If an extreme deviation in sensor sensitivity is detected, a warning can be issued to prompt maintenance of the sensor or on-site environmental confirmation, thereby preventing a decline in system reliability due to overcorrection of the reference value. In addition, in the event of a setting failure, a standard fixed value is temporarily used as a reference value, so even in this case, no major false alarms occur, which is extremely useful in the disaster prevention industry.

[Brief explanation of the drawing]

FIG. 1 is a basic configuration block diagram of the alarm device of the present invention, FIGS. 2 and 3 are graphs used to explain the operation of the initial setting of the reference value of the present invention, and FIG. 4 is the reference value correction of the present invention. 5 is a flowchart of the initial setting of the receiver of the present invention, FIG. 6 is a flowchart of normal monitoring of the receiver, and FIG. 7 is a reference value correction of the receiver of the above. This is a flowchart. RC...receiver! ...Transmission line, ASI~A8n・
...Analog sensor, ME...Storage unit, MP...
Central processing unit, IFM, IFP...interface, MD...transmission section, CN...operation section, DS...
Display section. Patent applicant: Nittan Co., Ltd. Figure 1 Receiver 2ffl Figure 3 Figure 4 111111-to/Japan) Figure S Figure 6 Figure 7

Claims (4)

[Claims] (1) An alarm device is configured in which a receiver and a plurality of analog sensors are connected through a transmission line, and the receiver periodically calls each of the analog sensors, and each of the analog sensors that are called receives temperature, An alarm system that sends return data indicating analog amounts of smoke concentration, gas, etc. to the receiver, determines whether the environment is normal or abnormal, and displays the area where the abnormality occurred and the state of the abnormality in the event of an abnormality such as a fire outbreak. In the receiver of the device, when the power is turned on, means for setting an average value of multiple return data for one of the analog sensors in a reference value storage unit corresponding to each of the analog sensors and determining an environmental abnormality; Means for temporarily setting a predetermined fixed value in the reference value storage section when the average value is outside the range of predetermined upper and lower limit values, and displaying a setting failure when the fixed value is set. 1. A receiver for an alarm device, comprising: a display section. (2) An alarm device is configured in which a receiver and a plurality of analog sensors are connected through a transmission line, and the receiver periodically calls each of the analog sensors, and each of the analog sensors called out receives temperature, An alarm system that sends return data indicating analog amounts of smoke concentration, gas, etc. to the receiver, determines whether the environment is normal or abnormal, and displays the area where the abnormality occurred and the state of the abnormality in the event of an abnormality such as a fire outbreak. The receiver of the device is provided with a reference value storage section corresponding to each of the above-mentioned analog sensors and for determining an environmental abnormality, and the above-mentioned return data within the update time set longer than the phenomenon time of the environmental abnormality is stored in the reference value storage section. means for re-setting a minimum value of , means for temporarily setting a predetermined fixed value in the reference value storage section when the minimum value is outside the range of a predetermined upper limit value and a predetermined lower limit value; 1. A receiver for an alarm device, comprising: a display section that indicates a setting failure when a setting is made. (3) The receiver for the alarm device according to claim 2, wherein the minimum value is determined from an average value of the returned data a plurality of times. (4) When determining an environmental abnormality based on the contents of the reference value storage section in which the above minimum value is set, the model of each of the above analog sensors that corresponds to the type of each analog sensor and corrects the above minimum value. 3. A receiver for an alarm device according to claim 2, further comprising a storage section that stores information such as the following information.