JPS6371788A - State change retrieving system - Google Patents

Abstract

PURPOSE:To shorten a time required for making retrieving and processing operations, by informing the relative position of a sensor, in which a state change takes place, as an n-bit address signal. CONSTITUTION:Transmission lines which individually connect each sensor are connected to the input side of a signal converting circuit 10 shown in the figure and, when a state change occurs in one of the sensors, the state change detecting circuit 10b of the signal converting circuit 10 outputs a one-bit collective state change signal (c). Simultaneously, an address signal outputting circuit 10a outputs an eight-bit address signal Ad which indicates the line number of the sensor, in which the state change takes place. Upon receiving the collective state change signal (c) from the state change detecting circuit 10b, a processor 30 actuates a processing program and reads the address signal Ad from the address signal output circuit 10a into its own memory as the relative address of the sensor, in which the state change takes place. Since a sensor, in which a state change takes place, can quickly be detected and processed when the state change occurs in the on/off information of one of the numerous sensors, any faulty sensor can be retrieved in a short time even if the number of the sensors is increased.

Description

[Detailed Description of the Invention] [Summary] In a sensor-based system that collects and searches information output from multiple sensors at one center, when handling a large amount of on/off information from each sensor, state changes may occur. Instead of checking the on/off status of all sensors as a way to search for sensors that have changed, a signal conversion circuit inputs the status signal from each sensor and outputs the relative position of only the sensor that has changed status as an address signal. By providing a sensor, it is possible to efficiently search for a sensor that has changed its state.

(Industrial Application Field) The present invention relates to a state change search method for a sensor-based system in which on/off information output from a plurality of sensors is collected in one center and searched.

The more sensors a sensor-based system handles, the more frequently their state changes occur. Therefore, the state change search method for sensor-based systems is to quickly search for sensors that have changed state in a short period of time. It is hoped that

[Conventional technology]

The state change search method of conventional sensor-based systems is the fifth one.
As shown in the block diagram of the figure, the m sensors of the sensor 20 send respective status signals to the signal conversion circuit 10 at the center through respective lines 0, 1.2, . . . -m-1.

The signal conversion circuit 10 relays the sent status signals of each sensor as they are to the processing device 30, but when a change occurs in one of the sensor status signals, the detection circuit 10b detects the occurrence of the status change all at once. A state change signal C is generated and output to the processing device 30.

When the processing device 30 receives the state change signal C, it starts a related processing program and inspects the state signals of all m sensors.

That is, the monitoring device 30 compares the current state of the on/off signals output by all the sensors with the previous state stored in its memory, searches for the sensor that has caused a change, and performs state change processing such as sending out an alarm. This is a method to do so.

[Problem that the invention seeks to solve]

In the conventional state change search method, all of the information output from m sensors is checked by the processing device 30. Therefore, as the number of sensors (m) increases and the amount of information handled by the processing device 30 increases, the state changes. It takes a long time to search for the sensor that has caused the change, and it takes a long time to complete the necessary processing after a change in the state of a sensor occurs.

Therefore, the conventional method has a problem in that it is not suitable for a sensor-based system that handles a large number of sensors and is required to quickly follow changes in state.

[Means for solving problems]

The state change search method of the present invention that solves the above problems is as follows:
When a state change occurs in a certain sensor, the information is notified to the processing device 30 by using the relative position 0, 1.2...T11-1 of the sensor that caused the state change as an n-focus address signal. The purpose is to notify you.

Therefore, as shown in the principle block diagram of FIG. 1, in the signal conversion circuit 10 between the sensor 20 and the processing device 30, the line number 0.1.2-.
- An address signal output circuit 110a is provided to output m-1 as an n-bit code address signal ^d.

[Effect]

In addition to the state change detection circuit 10b, the signal conversion circuit 10 includes:
Since the address signal output circuit 10a is provided, when a state change occurs in one sensor among the m sensors, that state change is generated in addition to the state change signal C from the state change detection circuit 10b. The identification numbers 0.1.2 . . . m-1 of the lines that transmit the sensor status signals are encoded into an n-bit code and output as d to the address signal.

Processing device 30 processes this state change signal C and address signal A.
When d is received, as shown in the program flow diagram of FIG. 2, the processing program is started by inputting the state change signal C, and the relative address of the sensor whose state has changed in response to the address signal Ad is read into its memory.

Next, the processing device 30 searches the information storage area of the sensor whose state has changed using the address read into the memory, and compares the current state and previous state of the on/off information output by the sensor. Compare the data and perform status change processing such as sending out an alarm.

Therefore, the processing device 30 does not search all sensors;
Since only the sensor whose state has changed can be searched and processed quickly, the time required for the overall search and processing can be shortened and the problem solved.

(Embodiment) FIG. 3 is a block diagram showing the configuration of a state change search method according to an embodiment of the present invention.

On the input side of the signal conversion circuit 100 in the same figure, there are 256 transmission lines 0.0. L2...2
55 is connected, and when a state change occurs in one of the 256 sensors, the state change detection circuit 10b of the signal conversion circuit 10 outputs a 1-bit batch change signal C.

At the same time, the address signal output circuit 10a outputs an 8-pinto (2-25
6) outputs the address signal Ad.

The processing device 30 starts a processing program by the batch state change signal C from the state change detection circuit 10b, and uses the 8-bit address signal Ad from the address signal output circuit 10a as the relative address of the sensor that caused the state change. Read into memory.

As shown in FIG. 4, the memory of the processing device 30 has 25
Since there is an area in which state change processing information for each of the six sensors is stored, the information storage area is searched using the above address signal Ad to identify the sensor that has caused a state change. Next, the current state of the on/off information output by the sensor is compared with the previous state, and if there is a change, a state change process such as sending out an alarm is performed.

Therefore, the state change search method of this embodiment can quickly (search and process) only the sensor that has caused a state change without searching all sensors, so the time required for the entire search and processing can be shortened and the problem is solved. resolved.

〔Effect of the invention〕

As explained above, according to the present invention, when a state change occurs in the on/off information of one sensor among a large number of sensors, the sensor that has caused the state change can be quickly detected and processed. Even if the number of items increases, the effect of searching in a short time can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a principle block diagram showing the configuration of the state change search method of the present invention, FIG. 2 is a program flow diagram of a processing device to explain the operation of the state change search method of the present invention, and FIG. 3 is a program flow diagram of the processing device according to the present invention. FIG. 4 is a block diagram showing the configuration of the state change search method according to the embodiment of the present invention, FIG. 4 is a memory diagram of a processing device for explaining the operation of the state change search method according to the embodiment of the present invention, and FIG. 5 is a state diagram of the conventional example. FIG. 2 is a block diagram of a change search method. 1, 3, and 5, 0.1.2-...+m-1 is a transmission line, 10 is a signal conversion circuit, 10a is an address signal output circuit, iob is a state change detection circuit, and 20 is a signal conversion circuit. 30 is a processing device. On the 46th day of my life, I decided to apply moxibustion on a seven-day basis.
Left leg A banquet for L” month f5) b riri 4 o- drawing
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Claims (1)

[Claims] A plurality of (m) sensors (20) to individual lines (0, 1
, 2..., m-1) to search for a sensor that has caused a state change. ..., m-1), and outputs an n-bit address signal (Ad) representing the relative position of the sensor that has caused a state change. A state change search method comprising (10a).