JPH0784634A - Display device for process control data - Google Patents

Abstract

PURPOSE:To provide a process control data display device for displaying controlled data, relational data and depending relation between these data to an operator. CONSTITUTION:This display device is provided with a measuring data buffer device 2 for time-sequentially inputting controlled data indicating the prescribed state of a controlled object 8 and relational data exerting influence upon the controlled data, a correlation degree calculating device 3 for calculating the strength of correlation among data stored in the device 2, a data storage device 4 for storing data together with the strength of correlation among those data, a display data selecting and managing device 5 for selecting and outputting prescribed relational data from the device 4 at the time of receiving a display request for prescribed controlled data, and a data display device 6 for displaying data outputted form the device 5 in the visual order based upon the strength of correlation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data display device for displaying data of a controlled object in process control and related data having some influence on the data, and more particularly, to a related data display request for the controlled object data. The present invention relates to a process control data display device which visually displays in order based on the strength of association.

[0002]

2. Description of the Related Art Generally, in process control, a data display device for process control is known which simultaneously displays on a screen data associated in advance with data of a predetermined control object by sequential control or the like. In this case, since the set of data to be displayed is limited to a preset one, it was not possible to freely call and display related data.

On the other hand, a correlation degree calculating device is provided, and the strength of the correlation between the data (hereinafter referred to as the correlation degree) is calculated by the correlation degree calculating device, and the data itself is the primary data and the correlation degree between the data. There has also been proposed a data display device for process control, in which the data is stored as secondary data in a predetermined data storage device and relevant data is called and displayed as necessary.

FIG. 5 shows the configuration of a conventional process control data display device provided with the above correlation degree calculation device. The conventional process control data display device 21 includes an observation data buffer device 22 that temporarily stores observed data.
And a correlation calculation device 23 for calculating the correlation between data
And a data storage device 24 for storing data and the degree of correlation between data and a data display device 25 for displaying data.

In the process control system having the process control data display device 21, there is a controlled object 26, and the controlled object 26 is controlled based on an upper control command such as an operation mode of the entire process. The device 27 controls. The control result of the control device 27 is fed back to the control device 27 again, and this control and feedback cycle forms a control loop.

Conventional process control data display device 21
Then, the observation data buffer device 22 inputs the control target data indicating the state of the control target object and the related data affecting the control target data, and temporarily stores the data, and the correlation degree calculating device 2
3 to the data storage device 24 and the data display device 25.

The correlation calculating device 23 inputs data from the observation data buffer device 22, calculates the correlation between the data, and stores the correlation together with the data in the data storage device 24.
Output to.

The data storage device 24 stores data and the degree of correlation between the data, and outputs predetermined data to the data display device 25 in response to a data display request from the operator 27 input via the data display device 25. .

The data display device 25 is a data storage device 24.
The data directly input from the observation data buffer device 22 is displayed on the operator 27.

[0010]

However, the conventional process control data display device provided with the above correlation degree calculation device merely reads out the data related to the control target data and displays it. . That is, the correlation is only stored in the data storage device,
What is the relevant data that most influences the controlled data, what is the data that indirectly influences the controlled data, or how much delay will be exerted on the controlled data when operating certain related data? No information was given to the operator.

That is, in the conventional data display device, since the data display and the statistics indicating the dependency relationship between the data such as the correlation degree are not linked at all and the data are displayed independently, the data displayed by the operator is displayed. Therefore, it is difficult to understand the dependency between data when making a control decision.

In addition, in ordinary process control, there are enormous number of process variables that are the data to be controlled, and it has been virtually impossible for the operator to grasp all the data and the dependency relationships between them. As a result, it has been extremely difficult for the operator to adjust the control parameters of the control loop appropriate for the controlled object while monitoring various data during the process operation.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional data display device for process control, and to display the data to be controlled and the related data to the operator together with the dependency relation between the data, to the process control data display device. To provide.

[0014]

In order to achieve the above object, a process control data display device of the present invention comprises control object data indicating a predetermined state of a control object, and related data affecting the control object data. A time-series input observation data buffer device, a correlation degree calculation device that calculates the strength of correlation between the data stored in the observation data buffer device, and the data is stored together with the strength of the correlation between the data. And a display data selection / management device that selects and outputs predetermined related data from the data storage device in response to a display request of predetermined control target data, and the display data selection / management device outputs the data. And a data display device for displaying the data in a visually ordered order based on the strength of the correlation.

[0015]

The data display device for process control according to the present invention has a correlation degree calculation device for calculating the correlation degree between data, and the correlation degree calculation device controls data to be controlled and related data such as a control loop affecting the data. , And stores the correlation degree together with the data in the data storage device. On the other hand, the display data selection / management device outputs predetermined data and correlation degree from the data storage device to the data display device in response to the data display request.

The data display device arranges the data on the screen on the basis of the degree of correlation, or displays the related data visually in order by the color or the emphasized display method. Or, if necessary, quantitatively the degree of correlation,
It is possible to display the time lag at which the degree of correlation becomes maximum.

Thus, the operator can instantly grasp a series of related data affecting the controlled object data in the order of the degree of the relatedness, and can easily control the control parameters of the control loop suitable for the controlled object. Can be adjusted.

Furthermore, when the time lag at which the degree of correlation is maximized is displayed, it is possible to estimate the time during which the control object is affected by the operation of the control loop, or how the current process state is. You can understand how things are changing and you can understand and predict the state of the entire process.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a process control data display device according to an embodiment of the present invention in relation to process control.

The process control data display device 1 of the present embodiment comprises an observation data buffer device 2 for temporarily storing observed data, a correlation degree calculation device 3 for calculating a correlation degree between data, and data and data. A data storage device 4 for storing the correlation degree between them, a display data selection / management device 5 for outputting predetermined data and the correlation degree in response to a data display request, a data display device 6 for displaying the data, and an input means 7. Consists of.

In the process control system having the process control data display device 1, there is a controlled object 8,
The control device 9 controls the control target 8 based on an upper control command such as an operation mode of the entire process. The result of the control device 9 controlling the controlled object 8 is fed back to the control device 9, and this control and feedback cycle form a control loop, and the numerical value related to the control is called a control parameter.

There are various data representing the state of the controlled object 8, and the data to be controlled is called controlled object data. Data indicating a control parameter that affects the control target data is referred to as related data.

The observation data buffer device 2 inputs the control target data and related data, temporarily stores them for adjustment with the processing speed of the subsequent correlation degree calculation device 3, and stores some data as data storage. The data is directly output to the device 4 and the display data selection / management device 5, and the remaining data is output to the correlation degree calculation device 3.

The correlation degree calculation device 3 inputs the control target data and the related data from the observation data buffer device 2, calculates the correlation degree between the data, and outputs the original data and the correlation degree to the data storage device 4. To do. Also, the correlation calculation device 3
In some cases, the display data selecting / managing apparatus 5 may newly calculate a correlation degree between data and output the calculated correlation degree to the display data selecting / managing apparatus 5.

The data storage device 4 stores the above data and the degree of association between the data in association with each other, and outputs the data and the degree of correlation to the display data selection / management device 5 in accordance with a command.

The display data selection / management device 5 performs the central management function of the process control data display device 1,
It plays the role of connecting the operator 10 and process control. Specifically, the display data selection / management apparatus 5 inputs a data display request from the operator 10 via the input means 7, and stores the requested data, related data related thereto and the degree of association between the data. And outputs it to the data display device 6. In this case, the correlation degree between the data is newly calculated by the correlation degree calculation device 3 as necessary, or the data is directly input from the observation data buffer device 2.

The data display device 6 inputs the data and the correlation degree from the display data selection / management device 5, and displays them on the operator 10 in order based on the correlation degree. Here, "displayed in order based on the degree of correlation" means that they are arranged and displayed in ascending or descending order according to the magnitude of the degree of correlation on the screen, or displayed in a color in a predetermined order of importance, It includes methods that can be easily conceived by those skilled in the art, such as ordering by the size on the screen or displaying numerical values of the degree of correlation.

Next, the correlation degree, which is a reference for the above display in the present invention, will be described with reference to FIG. In FIG. 2, assuming that the control target data is x and the related data for evaluating the correlation is y, data x (t), y on the time axis t of x and y.
(T) is read out respectively. As shown in Fig. 2 (a), these x (t) and y (t) are related to each other (in this case, time-series data) with a certain time difference m (m0 is m at which the correlation strength is maximum). (Similarity of)
The correlation function Rxy (m) is calculated in (1) (FIG. 2 (b)).

[0029]

[Equation 1] Here, T indicates the range of time for calculating the correlation function.

From equation (1), it can be seen that the correlation function R is a function of the time lag m and is the geometric mean of x (t) and y (t). This Rxy (m) is m on the horizontal axis and Rxy on the vertical axis.
It can be seen that when (m) is taken, a binomial distribution is formed as shown in FIG. 2 (c), and the maximum value Rxy (m0) is taken at m0.

Next, the correlation function is x (t), y (t)
Since the numerical value fluctuates variously depending on the size of, it is inconvenient for comparison. Therefore, the correlation rxy
Convert to (m).

[0032]

[Equation 2] Here, Rxx (0) and Ryy (0) are x (t),
Rxy (m) is 0 and 1 by indicating the power of y (t) (one's own geometric mean with zero time lag) and dividing Rxy (m) by the product of Rxx (0) and Ryy (0). To a value of between r xy (m). By comparing the degrees of correlation, it is possible to compare the strength of the mutual relation between the data.

Next, the display method of the process control data display device 1 will be described using a specific example.

FIG. 3 shows an example of a case where a display request is made for the temperature inside the heating furnace as the control target data. The display data selection / management device 5 reads the air flow rate of the third duct, the air flow rate of the second duct, and the heater temperature from the data storage device 4 based on the degree of correlation with respect to the data of the furnace temperature. And outputs it to the data display device 6.

The data display device 6, as shown in FIG.
The above data are arranged vertically in descending order of the degree of correlation, and the transition of each data is displayed on the left side on the time axis with the reference time points aligned. To the right of the graph of this data over time,
The data name of each data, the correlation strength, and the time shift amount (time shift) are displayed.

From this display screen, the operator 10 instantly understands that the control device relating to the temperature in the furnace is the blowers of the third and second ducts, and subsequently the heater temperature is involved.

Further, from the data of the respective time shift amounts, it is possible to easily estimate the time in which the temperature inside the furnace is affected when each of the above control devices is operated.

Next, another display example will be described. Figure 4
Shows a display example in the case of requesting the display of the in-furnace temperature of the sensor A as the control target data and referring to the in-furnace temperature by the sensors B and C.

This is displayed when there is a problem in the reliability of the temperature inside the furnace by the sensor A or when the temperature inside the furnace is not average, for example.

In this case, in response to the reference data of the furnace temperature by the sensor A, the display data selection / management device 5 reads the furnace temperatures of the sensors B and C from the data storage device 4 and calculates the correlation degree. The data is input to the device 3 to calculate the degree of correlation and the like, and the result is output to the data display device 6.

The data display device 6, as shown in FIG.
The temperature inside the furnace by each sensor is arranged in the horizontal direction, the temperature on the vertical axis is scaled if necessary, and the graph with respect to the time is displayed on the upper stage of the screen as the same size on the display.
The data name, the strength of the correlation, and the time shift amount are displayed below the transition temperature graph of each furnace.

From the display of FIG. 4, the operator 10 can easily judge whether the observed temperature is proper by comparing the temperature inside the furnace of the sensor A with the temperature inside the furnace measured by other sensors.

Including the display items and display specifications of the above specific example, the process control data display device 1 of the present invention prepares the following display items or display specifications. (a) First display data (controlled data) (b) Correlation evaluation related data class (control amount data, manipulated variable data, reference data, manual setting) (c) Maximum time range for correlation evaluation ( T) (d) Display number of data other than the first display data (including 0) (e) Direction of array of display data correlation (ascending / descending order) (f) Selection of display array direction (on screen) Aligning the time axis in the vertical direction / arranging it in the horizontal direction by adjusting the scaling of the output axis, etc.) (g) Time difference between the output of the control target data and related data (time difference m0) The target control amount and the manipulated variable data indicating the difference between the current control target data are the data indicating the manipulated variable of each control device (control parameter), the reference data are the data used for the judgment designated by the operator, and the manual setting. Is a control pair It is a display specification that allows manual setting of image data and related data.

By designating the display specifications of (b) and (e) above, it is possible to know the actuators that control the data to be controlled in the order of relevance as shown in FIG.

Further, as shown in FIG. 4, in order to diagnose the validity of the temperature sensor in the furnace, the data of the sensor A, the sensor B, and the sensor C which are sensing at different positions in the furnace are compared. The display specifications (b) can be used to manually set the data for sensors B and C, and the display specifications (f) can be specified to align the output axes and arrange them in the horizontal direction. As a result, in the example of FIG. 4, it is found that the gain and correlation of the sensor C deviate greatly from the sensor A, and the sensor C
It is possible to easily detect the failure of the.

The display specification (g) can be used to estimate the dead time of the actuator operation amount that affects the process amount of interest. However, the search range (-T or T) must be set appropriately in order not to increase the calculation load.

The input means 7 may be an independent input device, but is preferably a GUI on the screen of the data display device 6.
(Graphical user interface) For example, the display class of the first display data of the display specification (a) and the display class of the related data of the display specification (b) can be registered in the system in advance so that they can be selected in a pop-up menu format.

In the above embodiment, the input means 7 is provided so that the display is made by the input of the operator 10. However, the process control data display device of the present invention is
You may make it display data automatically according to the command of another higher-order control device, without providing a special input means.

[0049]

As is apparent from the above description, since the process control data display device of the present invention displays the related data which influences the control target data in a visually ordered manner on the basis of the degree of correlation between the data, it is displayed. The operator can quickly grasp the parameters of the control loop for the controlled object, and can easily operate the appropriate control device.

Further, when the time difference between the output of the control target data and the related data is displayed, the time when the influence of the operation becomes apparent can be grasped, so that the operator can appropriately change the operation timing and the current process state transition. Can be grasped.

Further, according to the process control data display device of the present invention, the reference data for the data of interest can be easily set and displayed in a comparable manner, so that the reliability of the data of interest can be determined. be able to.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a process control data display device according to the present invention.

FIG. 2 is a diagram showing a part of a procedure for calculating a correlation degree.

FIG. 3 is a diagram showing a display example when related temperatures are displayed in order of the degree of relevance with the furnace temperature as control target data.

FIG. 4 is a diagram showing a display example when the first display data is the temperature inside the furnace of the sensor A and the sensors B and C are displayed as reference data.

FIG. 5 is a diagram showing a configuration of a conventional process control data display device.

[Explanation of symbols]

 1 Process Control Data Display Device 2 Observation Data Buffer Device 3 Correlation Calculator 4 Data Storage Device 5 Display Data Selection / Management Device 6 Data Display Device 7 Input Means 8 Control Object 9 Control Device

Claims (1)

[Claims] 1. A control target data indicating a predetermined state of a control target, an observation data buffer device for inputting related data affecting the control target data in a time series, and the observation data buffer device stored in the observation data buffer device. A correlation degree calculating device for calculating the strength of correlation between data, a data storage device for storing data together with the strength of correlation between data, and the data storage device for a display request of predetermined control target data A display data selection / management device for selecting and outputting predetermined related data from the data display device, and a data display device for visually ordering the data output by the display data selection / management device based on the strength of correlation. A process control data display device having.