JP2004317230A - Data storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data storage device for storing/holding high-speed and low-speed sample measurement data on a sudden phenomenon with a desired storage span specified in the vicinity of the time point of the occurrence of the sudden phenomenon, and precisely analyzing the sudden phenomenon. <P>SOLUTION: This device is equipped with a sensor part for detecting measured information from a measuring object, a sample rate setting part for setting at least two kinds of sample rates different from each other for the measured information, memory domains to be severally stored with sample data at the sample rates for the measured information, a trigger setting part for setting prescribed conditions on the measured information to put out a trigger when the conditions are met, a record time setting part for setting a time period up to the stopping of storage of the sample data in a storage domain based on the trigger from the trigger setting part, and a control part for stopping the storage after the time period set in the time setting part has elapsed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a data storage device, and more particularly, to a data storage device capable of simultaneously storing data by sampling the same data at high-speed and low-speed sampling periods and specifying a storage range using two ring buffer memories.
[0002]
[Prior art]
Conventionally, a measurement unit that samples measurement data at a predetermined sample rate, a ring-shaped buffer memory that sequentially stores measurement data sampled by the measurement unit, and monitoring of a change state of the measurement data, a predetermined trigger condition is satisfied. A trigger detection circuit that outputs a trigger signal at the time of the first detection, a first data memory in which measurement data stored in the buffer memory is sequentially stored based on a trigger signal output from the trigger detection circuit, There is known a measurement data collection device including a second data memory in which measurement data sampled by a section is thinned out at a fixed interval and sequentially stored.
[0003]
[Patent Document 1]
JP-A-6-332621 (FIG. 1)
However, in the conventional device, the high-speed sample data is stored in the first data memory after the trigger condition is satisfied. For this reason, there is a disadvantage that high-speed sample measurement data before the trigger condition is satisfied cannot be stored. In addition, the low-speed sample data is sequentially stored, so that long-time measurement storage can be performed. However, the data is stored irrespective of the trigger condition, the storage time is constant, and data before and after the trigger condition is satisfied is sequentially updated and disappears.
[0004]
As described above, the conventional apparatus cannot store the states before and after the sudden phenomenon accurately, and thus cannot analyze the sudden phenomenon accurately.
[0005]
[Problems to be solved by the invention]
The present invention solves the above-mentioned inconvenience, and can store and hold high-speed sample measurement data and low-speed sample measurement data of a sudden phenomenon by specifying a desired storage range before and after the sudden phenomenon occurrence point. It is an object to provide a data storage device that can store and analyze data accurately.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a CPU that sets two areas in a storage ring buffer memory in advance, takes measurement data from a measurement target at a high-speed sampling period, and performs predetermined processing, and an output measurement from the CPU. A ring buffer memory I that sequentially stores measurement data based on data, a ring buffer memory II that thins out the measurement data at regular intervals and sequentially stores the data, a trigger setting unit that detects a sudden phenomenon and generates a trigger, And a storage time setting for setting the storage time of the measurement data in the ring buffer memories I and II after the occurrence of the trigger.
[0007]
The present invention stores a sensor unit for detecting measurement information from a measurement target, a sample rate setting unit for setting at least two different sample rates of the measurement information, and sample data of the measurement information at the sample rate. A memory area, a trigger setting unit that sets a predetermined condition for the measurement information and issues a trigger when the condition is matched, and stores the sample data in the storage area based on a trigger of the trigger setting unit. It is characterized by a recording time setting unit for setting a time until storage is stopped, and a control unit for stopping the storage after the lapse of the time set in the recording time setting unit.
Further, the recording area is a ring buffer memory.
[0008]
[Action]
Monitor the change state of the measurement data, and for each set time preset from the point in time when the predetermined trigger detection condition is satisfied, the high-speed sample measurement data and the low-speed sample measurement data obtained by thinning out the high-speed sample measurement data at regular intervals. Are stored, and the storage of the measurement data is stopped. As described above, in the same memory, two different ring buffer memories are used at the same time, and two different measurement sample measurement data are simultaneously stored near the time when the trigger signal is generated.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a main block diagram of an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a sensor unit that generates measurement data (measurement information).
In FIG. 1, reference numeral 2 denotes a sample rate I setting unit for setting a high-speed sample rate (hereinafter, referred to as sample rate I) for sampling the measurement data, and reference numeral 3 denotes a sample rate for the measurement data. A sample rate II setting unit for setting a low sample rate (hereinafter, referred to as a sample rate II) such as 1/10 or 1/100 of the rate I is shown.
In addition, reference numeral 4 in FIG. 1 denotes a trigger setting unit in which a trigger setting value for generating a trigger for detecting a sudden phenomenon or the like of the measurement data is set. 2 shows a recording time setting unit for setting each recording time for storing in II.
In FIG. 1, reference numeral 6 denotes a memory, which is provided with two areas, that is, a ring buffer memory I for high-speed sample data and a ring buffer memory II for low-speed sample data.
[0010]
In FIG. 1, reference numeral 7 denotes a control unit, and the memory 6 is connected to the control unit 7 via a bus 8.
Furthermore, the sensor unit 1, the sample rate I setting unit 2, the sample rate II setting unit 3, the trigger setting unit 4, and the storage time setting unit 5 are connected to the control unit 7, respectively. Sample I data and sample II data sampled and processed by I and II are stored in the ring buffer memory I and the ring buffer memory II via the bus 8, respectively. Further, the trigger setting unit 4 generates a trigger when the measured data exceeds the trigger set value, and the control unit 7 stops storing the sample data I and II when a predetermined recording time expires.
[0011]
2 and 3 are explanatory diagrams of the high-speed sample measurement data (I) and the low-speed sample measurement data (II) in which the measurement data is processed at the high-speed and low-speed sample rates and stored in the memory 6 in the configuration of FIG. .
FIG. 2 shows a case where the measured data changes rapidly, and FIG. 3 shows a case where the measured data changes gradually.
[0012]
FIG. 4 is a flowchart showing the operation of the present embodiment.
With such a configuration, a characteristic operation of the present embodiment will be described.
First, measurement data stored in the memory 6 will be described with reference to FIGS.
[0013]
Here, assuming that the entire storage capacity of the memory 6 is 512K words (4M bits), the capacity of the ring buffer memory I is about 51K words, and the capacity of the ring buffer memory II is 460K words.
The data stored in the memory 6 requires 6 bytes for date / time, 2 bytes for measurement data, and 3 bytes for counter for one piece of measurement data, and 11 bytes in total. That is, the number of measurement data stored in the ring buffer memory I is 51000/11 ≒ 4600, and the measurement data over a period of 4.6 seconds at a sample rate of 1 KHz can be stored.
[0014]
On the other hand, the number of measurement data stored in the ring buffer memory II is 460000/11 ≒ 41000 (41K). When the sampling rate is reduced to 1/10, the sampling rate is 100 Hz and 410 seconds (90 times the high-speed sampling time). Measurement data can be stored, and when the sampling rate is reduced to 1/100, the measurement data can be stored at a sampling rate of 10 Hz for 4100 seconds (900 times the high-speed sampling).
[0015]
Each of the ring buffer memory I and the ring buffer memory II stores the data of the above-described data storage number. When each area becomes full, the oldest measurement data is stored every time one new measurement data is stored. Is updated by one, and a fixed number of measurement data are always stored. This is one of the features of the present invention.
[0016]
Further, if the measured data exceeds the trigger set value of the trigger setting unit 4 due to a sudden phenomenon or the like, the trigger condition is satisfied, and the storage of the measured data in the memory 6 is performed after the recording time set in the recording time control unit 5 in advance. Stopped. With the set value of the recording time, it is possible to freely set the range in which the measurement data near the sudden phenomenon is desired to be recorded.
[0017]
For example, to store the measurement data with a ratio of 5: 5 before and after the satisfaction of the trigger condition in the ring buffer memory I, the recording time setting unit 5 is set to 2.3 seconds. That is, since the number of measurement data stored in the ring buffer memory I is 4,600, if the old 2,300 measurement data before the trigger condition is satisfied is updated to the new measurement data after the trigger condition is satisfied, the 2,300 measurement data before the trigger is satisfied. The data and 2300 pieces of measurement data after the trigger are stored and held in the ring buffer memory I. Since the sample rate of 2300 pieces of measurement data is 1 KHz, the set value is 2.3 seconds.
To store and hold a large amount of data before the trigger with emphasis on the measurement data before the trigger condition is satisfied, set the set time value to less than 2.3 seconds. Conversely, to store and hold a large amount after the trigger, the set time is Set greater than 2.3 seconds.
When storing the measurement data at a sample rate of 100 Hz in the ring buffer memory II, if the recording time setting unit 5 sets 205 seconds, the data with the ratio before and after the trigger condition establishment of 5: 5 is set smaller than 205 seconds. For example, if the data before the trigger is set to be longer than 205 seconds, the data after the trigger is stored and held.
This is one of the features of the present invention.
[0018]
2 and 3 show that the data of the sample rate of 1 kHz is stored in the ring buffer memory I and the data of the sample rate of 100 Hz is stored in the ring buffer memory II, and the set time of the recording time setting unit 5 is stored in the ring buffer memory I. In this example, the time is set to 2.3 seconds, and to the ring buffer memory II, 205 seconds.
In the figure, t2 is the time of the oldest measurement data stored in the ring buffer memory I, t3 is the time when the trigger condition is satisfied, t4 is the end of the set recording time of the ring buffer memory I, and t1 is the data stored in the ring buffer memory II. The earliest measured data time t5 indicates the end of the set recording time of the ring buffer memory II.
T1 is the stored measurement data before the trigger condition of the sample I data is satisfied, T2 is the stored measurement data after the trigger condition of the sample I is satisfied, T3 is the total storage measurement data of the ring buffer memory I, and T4 is the trigger of the sample II data. The stored measurement data before the condition is satisfied, T5 is the stored measurement data after the trigger condition of the sample II data is satisfied, T6 is the total storage measurement data in the ring buffer memory II, T7 is the total storage measurement data in the ring buffer memory I as in T3. Shown respectively.
t1 to t3 and t3 to t4 each indicate 2.3 seconds, and t1 to t3 and t3 to t5 each indicate 205 seconds.
[0019]
As shown in FIG. 2, the sudden phenomenon can be accurately analyzed by the high-speed sample measurement data before and after the trigger condition is satisfied. When only the measurement data after the trigger condition is satisfied is stored as in the conventional device, the abnormal signal can be accurately analyzed. Analysis is not possible. Further, the presence of the low-speed sample data before and after the sudden phenomenon allows the sudden phenomenon to be accurately analyzed with long-term measurement data. In addition, in the sudden change measurement data shown in FIG. 3, the sudden change can be grasped by high-speed sample measurement data before and after the occurrence of the sudden change as shown in FIG. When only the measurement data of the above is stored, the entire sudden phenomenon cannot be grasped.
As described above, one of the features of the present invention is that the measured data of the sudden phenomenon is stored and held in the memory within a desired range at a high sampling rate and a low sampling rate.
[0020]
FIG. 4 is a flowchart showing a flow of such a series of operations.
In step S10 (hereinafter simply referred to as S10), sample rates I and II are initially set in sample rate setting units 2 and 3, trigger conditions are initially set in trigger setting unit 4, and recording time setting unit 5 sets each of them. The recording time is initialized. After the initialization, the control unit 2 receives the measurement data from the sensor unit 1 (S11). The measurement data is sampled at the sample rate I of the sample rate I setting unit 2 to generate high-speed sample measurement data (S12), and the high-speed sample measurement data is compared with a trigger set value (S13). If it is determined that the trigger condition is not satisfied (S13 No), the process moves to S14 and S18 simultaneously, stores the high-speed sample measurement data in the ring buffer memory I (S14), and then jumps to S12 to repeat the operation from S12. Run.
In S18, the validity as the low-speed sample data is determined, and when it is determined that the data is invalid, the process jumps to S12, and the operations from S12 are repeated and executed (S13No, S18No, S12). When it is determined in S18 that the data is valid, that is, when the high-speed sample measurement data is thinned-out low-speed sample measurement data (S13 No, S18 Yes), it is stored in the ring buffer memory II (S19). , S20 are No, and the operation from S12 is repeatedly executed.
[0021]
When the sudden phenomenon occurs, it is determined that the trigger condition is satisfied in S13 (S13 Yes), and the recording time (for example, 2.3 seconds) of the ring buffer memory I is counted in S15 (S15). If it is before the recording set time of the ring buffer memory I, the high-speed sample measurement data is stored in the ring buffer memory I in S14, and the operation from S12 is repeatedly executed (S16No, S14, S12). When the recording set time of the ring buffer memory I elapses (S16 Yes), the storage of the high-speed sample measurement data in the ring buffer memory I stops (S17).
[0022]
If it is determined in S13 that the trigger condition is satisfied (S13 Yes), the process also proceeds to S18. In S18, the validity as the low-speed sample data is determined. If the data is determined to be invalid, the process jumps to S12, and the operation from S12 is repeated and executed (S13 Yes, S18 No, S12). When it is determined in S18 that the data is valid, that is, when the high-speed sample measurement data is thinned-out low-speed sample measurement data (Yes in S18), the data is stored in the ring buffer memory II (S19). Is Yes, and the recording time (for example, 205 seconds) of the ring buffer memory II is counted in S21 (S21). If it is before the recording set time of the ring buffer memory II (S22 No), the process jumps to S12 and repeats the operation from S12. When the recording set time of the ring buffer memory II elapses (S22 Yes), the storage of the low-speed sample measurement data in the ring buffer memory II stops (S23), and the measurement operation of the device also stops (24).
[0023]
The above embodiment has shown an example in which two sample measurement data at two sample rates are stored in a desired range before and after a trigger is generated. However, the present invention is not limited to this, and may store sample measurement data at one sample rate in a desired range before and after the trigger is generated, if necessary. Three or more sample measurement data according to the sample rate may be stored in a desired range before and after the trigger is generated.
[0024]
【The invention's effect】
As described above, according to the present invention, a sensor unit for detecting measurement information from a measurement target, a sample rate setting unit for setting at least two types of different sample rates of the measurement information, and the sample of the measurement information A memory area for storing sample data at a rate, a predetermined condition for the measurement information, a trigger setting unit for issuing a trigger when the condition is satisfied, and a trigger set by the trigger setting unit. A recording time setting unit that sets a time until the storage of the sample data in the storage area is stopped; and a control unit that stops the storage after the elapse of the time set in the recording time setting unit. It is characterized by having.
Further, the recording area is a ring buffer memory.
Accordingly, one device can divide one memory into two ring buffer memories and store and hold measurement data sampled at a high sampling period and measurement data sampled at a low speed.
In addition, the storage and holding of the measurement data can be set and stored and held in an arbitrary range around the time when a desired condition is satisfied.
Further, there is no need to add special hardware in addition to the conventional device, the device is not complicated, and the manufacturing efficiency is good.
Further, as compared with the conventional device, measurement data in a desired range before and after the occurrence of a sudden phenomenon can be stored and held, so that the sudden phenomenon can be accurately analyzed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a main part of an embodiment of the present invention. FIG. 2 is a diagram showing an example of storage of measurement data according to an embodiment of the present invention.
FIG. 3 is a diagram showing another example of storage of measurement data according to the embodiment of the present invention; FIG. 4 is a flowchart showing the operation of the embodiment of the present invention;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sensor part 2 Sample rate I setting part 3 Sample rate II setting part 4 Trigger setting part 5 Recording time setting part 6 Memory 7 Control part 8 Bus

Claims (2)

A sensor unit for detecting measurement information from a measurement target,
A sample rate setting unit configured to set at least two types of different sample rates of the measurement information;
A memory area for storing sample data of the measurement information at the sample rate;
A trigger setting unit that sets a predetermined condition for the measurement information and issues a trigger when the condition is matched;
A recording time setting unit that sets a time until storage of the sample data in the storage area is stopped based on a trigger of the trigger setting unit;
A control unit that stops the storage after the lapse of the time set in the recording time setting unit;
A data storage device comprising: 2. The data storage device according to claim 1, wherein the recording area is a ring buffer memory.

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