JPH04131999A - Trend history display device - Google Patents

Abstract

PURPOSE:To maintain resolution determined by an input period and not to receive the effect of the performance of a communication circuit by providing a receiving means to receive history data from an external part, a storage device to store the history data, a display means to edit the history data and a display device to visible-output the data. CONSTITUTION:A transmitting means 24 transmits history data stored in a storage device 27, that is, a header part and a data part end bloc to a receiving means 31 of a trend history display device 3 through a communication circuit 4 every time when a display updating requiring signal 25 is inputted. The receiving means 31 receives the history data through the communication circuit 4 and stored in a storage device 33. A display means takes out them every time the history data are stored in the storage device 33 and executes data editing to execute trend history display on a display device 35. Thus, the history data can be reproduced in the storage device 33 of the trend history display device 3 with maintaining resolution by an input period and the effect of the performance of the communication circuit is not received.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a trend history display device used in various industrial plants to predict plant failures and accidents.

(Conventional technology) In industrial plants such as nuclear power plants, before and after an emergency situation such as a failure or accident occurs in the plant, the main operational parameters that triggered it are numerically analyzed to indicate signs of failure or accident. Fluctuations are common.

For example, in a nuclear power plant, there is a system outside the central control room that controls and monitors the plant operating status to assist operators in the event of a failure or accident in the plant, to investigate the cause and carry out recovery measures without confusion. There is an emergency response room equipped with a data display system that provides support members with operational information obtained from data collection equipment installed in the plant.

This data display system is equipped with a trend history display device that displays the history of numerical changes of major parameters in plant operation, which are data generation sources, as a correlation diagram with elapsed time.

FIG. 8 shows a conventional trend history display device, in which numerical data DT from a data source 1 is applied to a data input means 21 of a data collection device 2.

The built-in clock 22 uses a crystal oscillation element or the like and is equipped with a mechanism for maintaining high accuracy, and applies a sampling request signal 23 to the data input means 21 at regular intervals. The data input means 21 receives the sampling request signal 2
3, the numerical data DT is inputted and outputted to the transmitting means 24 each time it is started.

The transmitting means 24 transmits numerical data DT to the receiving means 31 of the trend history display device 3 every time it is input. in this case,
Numerical data DT to be sent to the trend history display device 3 is encoded to be compatible with the communication line 4 before being sent.

Every time the receiving means 31 receives encoded data from the communication line 4, it restores it to numerical data DT and outputs it to the data storage means 32, and serves as a data input means for the trend display device 3. There is.

The data storage tank means 32 receives the numerical data D from the receiving means 31.
Every time T is received, numerical data D is sent to the storage device 33.
Send T and save it as historical data.

The display means 34 edits data in order to display the trend history on the display device 35 based on the history data stored in the storage device 33, and displays the trend history by the reverse procedure of the data storage means 32. , providing information to emergency response room support members.

(Problem to be Solved by the Invention) However, in order to display the trend history on the display device 35 with higher resolution in response to changes in the behavior of the data generation source 1, it is necessary to increase the sampling request signal 23 of the clock 22. It is necessary to shorten the generation interval and make the data storage means 32 follow this, and for this purpose, it is necessary to make the transfer time of the communication line 4 sufficiently smaller than the generation interval of the sampling request signal 23. Therefore, the communication line 4 must be high-speed, and the transfer time must be highly accurate and stable. Conventionally, there is no line that can meet this requirement, and it is not possible to display the history of plant numerical fluctuations with high accuracy. It hasn't come true.

SUMMARY OF THE INVENTION An object of the present invention is to provide a trend history display device that solves the problems of the prior art, maintains the resolution determined by the input cycle, and is not affected by the performance of the communication line.

[Structure of the Invention] (Means for Solving the Problems) The trend history display device of the present invention obtains numerical changes in a data source from a data collection device installed externally, and displays the history of this numerical change as the numerical value and the progress. In a trend history display device that displays a time correlation diagram on a display device, the data input means converts the data of the data source into numerical values, and the data storage means arranges the numerical values from the data input means in chronological order to form historical data. a storage device that stores the historical data; a receiving device that connects to a data collection device that includes a transmitting device that sends the historical data stored in the storage device to the outside; and a receiving device that receives the historical data from the outside; , a storage device for storing the historical data, a display device for editing the historical data, and a display device for visually outputting the data, so that the performance is not affected by the connection device to the data collection device. shall be.

(Function) In the trend history display device of the present invention having such a configuration, by transmitting the history data all at once at the required display update cycle, the storage of the trend history display device is maintained while maintaining the resolution according to the input cycle. Since historical data can be reproduced in the device, a high-resolution trend historical curve can be obtained without depending on the input cycle of the communication line.

(Example) Next, the present invention will be described in detail with reference to the drawings. In the following figures, the same parts as in FIG. 8 are given the same reference numerals.

In FIG. 1, the numerical data DT of data source 1 is
It is added to the data input means 21 of the data collection device 2.

The clock 22 is a known clock that uses a crystal oscillation element or the like and has a mechanism for maintaining high accuracy.The clock 22 applies a sampling request signal 23 to the data input means 21 at a period Ti, and also outputs a display update request signal 25. It is added to the transmitting means 24 at a period Th. Here, the display update period Th is set to maintain the relationship expressed by the following equation with respect to the communication time Tm of the communication line 4.

Th≧T■ ・・・・・・・・・・・・ (1) The data input means 21 receives the sampling request signal 23 at the period Ti.
Each time data is input, data DT is input from the data generation source 1 and output to the data storage means 26 as numerical data DT, which will be explained below.

FIG. 2 shows the relationship between changes in the behavior of the data source and numerical data DT. In the figure, the horizontal axis is time and the vertical axis is numerical values, and it is assumed that the numerical behavior of data source 1 changes as shown by curve C.

The clock 22 outputs the sampling request signal 23 at time T1.
is outputted to the data input means 21, the data input means 21 inputs the numerical value of the point Pl on the curve C at time TI, obtains numerical data DTI corresponding to the reading on the vertical axis, and stores it in the data storage means. Send on 26th. Furthermore, the data input means 21 similarly sends the numerical data DT2 of the point P2 to the data storage means 26 at time T2 after the period Ti has elapsed.

Thereafter, similarly, the data input means 21 repeatedly executes the above-described operation every period Ti.

The data storage means 26 stores numerical data DT in the storage device 27.
is accumulated and saved as historical data.

An example of this history data is shown in FIG.

In the same figure, history data includes a header part HP consisting of data number n, and numerical data DT which accumulates numerical data DT.
It is composed of a data section DP consisting of I to DTn.

In addition, here, the time T between each numerical data DTI to DTn
1 to Tn are assumed to be equally spaced TI because the clock 22 is highly accurate. Further, the data number n indicates the number of numerical data DT stored in the data section DP.

Every time the transmitting means 24 receives the display update request signal 25,
The history data stored in the storage device 27, that is, the header portion HP and data portion DP in FIG.

The receiving means 31 receives historical data via the communication line 4 and stores it in the storage device 33.

The display means 34 takes out historical data every time it is stored in the storage device 33 and edits the data in order to display the trend history on the display device 35.

Next, the operation of the display means 34 will be explained using FIG. 2.

First, the time Tn and the sampling request signal 2 of the clock 22
From the period TI of 3, the time axis (Tl to Tn) for each numerical data DT is determined.

Next, the points of intersection with the numerical data DTI to DTn having the same subscript number in the data part DP of the history data are
By connecting these points Pl=Pn with a straight line, a curve C is obtained.

In the apparatus of the present invention having the above-described configuration, for example, the data generation source changes its behavior as shown by the curve C shown in FIG.
3. Consider the case where the trend is displayed in (Figure 4 (C)). In addition, in both FIGS. 4(a) to 4(c), the horizontal axis indicates time, the vertical axis indicates numerical values, and the scales are the same. Further, the processing procedure up to the formation of history data will be explained using the flowchart of FIG.

In FIG. 5, a sampling request signal 2 from a clock 22 is shown.
3 is output (step 101), the data input means 21
Input redata DT from data source 1 in step 102.
) and output to the data storage means 26.

Now, the contents of the history data are data time Tn-1゜data number n-1, accumulated numerical data DTI-D in data section DP.
Suppose that it is Tn-1. In this state, data storage means 2
When numerical data DT is input to 6, data storage means 2
6 stores this numerical data DT at the end of the input data section DP, that is, as numerical data DTn (step 103).
).

Next, set the number of data items to nl:! By changing F (step 104), one accumulation operation is completed.

Each time the clock 22 passes the period Ti (step 105
), outputs the sampling request signal 23 (step 101
), history data is formed in the storage device 27.

In this way, at time Tn, the storage device 23 stores the time T.
Numerical data DTI to DTn corresponding to 1 to Tn will be saved.

Next, the processing procedure from history data to trend history display will be explained using the flowchart shown in FIG.

The clock 22 outputs the display update request signal 25 (step 20
1), the transmitting means 24 transmits the history data in the storage device 27 to the communication line 4 (step 202).

The receiving means 31 receives historical data from the communication line 4 for a communication time T.
It is received after m has elapsed (step 203).

That is, numerical data DTl-D corresponding to time TI-Tn
Assuming that the historical data of Tn is stored in the storage device 27, the actual data reaching the storage device 33 due to the intervention of the communication line 4 is generally determined by the following equation based on the line speed and data amount of the communication line. This occurs after the unique communication time Tm has elapsed.

TI-data amount/line speed (2) Upon receiving the history data, the receiving means 31 stores the history data in the storage device 33 (step 204).

Thereafter, the display means 34 displays a trend history on the display device 35 based on the history data in the storage device 33, that is, the numerical data DTI to DTn (step 205). As a result, the first display is performed as shown in FIG. 4(b).

Next, the process waits for the display update period Th to elapse (step 206).

After the communication time Tm has elapsed, the flow of data on the communication line 4 stops, so the next history data can be transmitted, but the output cycle of the display update request signal 24 of the clock 22 is as follows: Display update cycle Th≧ The communication time TI is set to (3), and at this timing, the transmitting means 24 is operated in order to output the display update request signal 25 (step 201).

Until then, the period T of the clock 22 is stored in the storage device 27.
Due to the sampling request signal 23 for each i, the time Tl +T
Since the history data for each cycle Ti from h to time Tn +Th is accumulated, the storage device 33 stores D T 1+T
The historical data of h-D T nlTh is reproduced.

Therefore, the trend history display for the next time Tl + Th - Tn + Th can be obtained on the display device 35 while maintaining the resolution determined by the period Ti as shown in FIG. 4(C).

Here, the display update period Th and resolution (number of data pieces) are determined, and the communication line 4 that needs to be prepared in order to realize this device is determined.
Let's find the performance, that is, the line speed.

For example, period Ti −0,001 (seconds), numerical data D
Size of T - 1 (1 (Byte), number of display data n
-100 and the display update period Th-30 (seconds), in the conventional technology, in order to transmit the numerical data DT at the period TI, the line speed - the size of the numerical data DT (Bytes)/the period Ti ( A line speed of -10/0.001 = 10000 (Byte/sec) - (4) is required.

On the other hand, according to the present invention, Communication time T - Display update period Th (5) Data amount - Number of display data nX Size of numerical data DT (Bytes) - 100 (pieces) X 10 (Bytes) - 1000 (B
yte) --(6) Line speed - Data amount (
Byte)/Communication time T■ (seconds) -1000 (Byte)/30 (seconds) -33,3(
Byte/sec) - As shown in (7), it can be seen that a low line speed is sufficient. Therefore, according to the present invention, it is possible to display trend history with high resolution even using a relatively low speed communication line. Obtainable.

Note that in the present invention, a packet switching network 5 as shown in FIG. 7 may be used. This packet switching network 5 is
This is a type of communication network for transmitting historical data from the data collection device 2 to the trend display device 3.

Consider a case similar to the embodiment of FIG. 1 with the configuration of FIG. 7.

When the transmitting means 25 operates, the historical data is reproduced in the storage device 33 via the packet switching network 5 and the receiving means 31, but the actual data reaching the storage device 33 is generally delayed due to the intervention of the packet switching network 5. , communication time Tm shown in the following formula
After .

T■ - Data jl/Line speed 1 Packet exchange delay time・
・・・・・・・・・(8) Here, the packet exchange delay time generally varies in the range of several milliseconds to several hundred milliseconds, depending on the performance of the switching equipment and the degree of congestion of the switching network. It is being said.

However, since the history data reproduced here is transmitted all at once, the time interval Ti of each numerical data generation source is not affected by the packet exchange delay time, and the trend history is displayed on the display device 35 by the display means 34. The display can be performed at equal time intervals as shown in FIGS. 4(b) and 4(C).

As described above, according to the embodiment shown in FIG. 7, the time interval Ti can be changed by connecting the data collection device 2 and the trend display device 3 through a packet switching network that is highly economical due to the pay-as-you-go method, although it involves delay time. Trend history display can be performed while maintaining equal intervals and the resolution determined by this interval Ti.

[Effects of the Invention] As described above, according to the present invention, a high-resolution trend history display can be obtained without being affected by the performance of the communication line connecting the data collection device and the trend history display device. .

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the system configuration of an embodiment of the present invention, Figure 2 is an explanatory diagram showing the correspondence between the numerical behavior of the data source and historical data, and Figure 3 is the history stored in the storage device. FIG. 4 is an explanatory diagram illustrating the operation of the trend history display of the present invention, and FIG.
) shows actual changes in the data generation source, (b) shows a trend display based on accumulated data, and (C) shows a trend display after time elapses. FIG. 5 is a flowchart for forming history data in the storage device 27 in the device of the present invention, FIG. 6 is a flowchart for obtaining trend history display from the storage device 27 in the device of the present invention, and FIG. Block diagram showing the system configuration of another embodiment, No. 8
The figure is a block diagram showing a conventional system. 1... Data source 2... Data collection device 3... Trend display device 4...
...Communication line 5...Packet switching network 21...Data manual means 22...
...Clock 23...Sampling request signal 24...
......Transmission means 25...Display update request signal 26.32.
...Data storage means 27.33...Storage device 31...Receiving means 34...Display means 35...Display device.

Claims (1)

[Claims] In a trend history display device that obtains numerical changes in a data source from a data collection device installed outside and displays the history of this numerical change on a display device as a correlation diagram between the numerical values and elapsed time, the data of the data source is displayed. A data input means for digitizing, a data storage means for arranging numerical values from the data input means in chronological order as historical data, a storage device for storing the historical data, and a storage device for transmitting the historical data in the storage device to the outside. a receiving means that is connected to a data collection device having a transmitting means and receives the historical data from the outside; a storage device that stores the historical data; a display means that edits the historical data; and a display means that visually outputs the data. A trend history display device comprising: a display device.