JPH089766Y2 - Trend display - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a trend display device for displaying data collected at regular intervals in time series, and more particularly to improvement in displaying a command value for a process and a response thereto.

[Prior art]

The trend display device is known, for example, in Japanese Utility Model Publication No. 61-11751 “graphic display device” proposed by the present applicant. An industrial control device displays state quantities such as pressure and temperature of a process in a time series to provide a convenient service.

[Problems to be solved by the device]

Conventionally, since the operator instructs the operation, the command value is not displayed at the same time as the state quantity. Therefore,
For example, when the pump is started to control the liquid level of the tank, the level change of the tank can be displayed, but the operating state of the pump and the start timing have not been displayed on the trend screen. However, in recent years, the control device side has also taken charge of driving instructions themselves by using artificial intelligence. Therefore, there was a problem that not only the state quantity but also the command value should be collectively displayed on the trend screen. The present invention solves such a problem, and an object thereof is to provide a trend display device capable of simultaneously displaying analog data such as a state quantity and on / off data such as a command value for an operating end on a trend screen.

[Means for Solving the Problems]

The present invention which achieves such an object has the configuration shown in the configuration block diagram of FIG. That is, the analog data is displayed by reading analog data holding means 11 for holding analog time series data such as process state quantity, and reading predetermined data from the analog data holding means 11 and setting 0 to 0 based on a predetermined value. Scaling means 12 for converting the value to 100% and determining the position of the 0 to 100% value and the time domain to be displayed on the drain screen, and analog data for displaying the value converted by the scaling means 12 in time series. It is composed of a display unit 13. The on / off data is displayed by an on / off data holding means 21 for storing on / off data such as a command value for the operating end in a process in time series, and a value stored in the on / off data holding means 21 is read out to obtain the analog data. 0 to 100% on the trend screen that displays the value, the span and bias value in the on / off display in the display axis direction are determined, and the bias / span setting means 22 that uses the same time axis as the analog data and the bias / span setting means 22 are used for conversion. An on / off data display unit 23 is provided for displaying the displayed values in time series according to a command. Further, as a feature of the present invention, when a plurality of on / off data is displayed on the on / off data display unit, the bias
The span setting means defines the span and bias value for each on / off data to be displayed.

[Action]

Each component of the present invention operates as follows. The analog data holding means, the scaling means and the analog data display section are generally used for displaying analog data. The bias / span setting means converts the data stored in the on / off data holding means in a format adapted to the analog trend display and sends it to the on / off data display section. When displaying a plurality of on / off data, the bias / span setting means can determine the span and the bias value for each on / off data to be displayed, and prevent the on / off display from overlapping with each other.

【Example】

The present invention will be described below with reference to the drawings. FIG. 2 is a configuration block diagram showing an embodiment of the present invention. In the figure, the control station 31 accommodates a large number of controllers that operate valves and the like to keep the flow rate at a constant value, or exchanges information necessary for input / output of the controllers. This information is a means of collecting trend data 32
And is appropriately stored in a storage medium such as the magnetic disk 33. These function as the analog data holding means 11 and the on / off data holding means 21. Operator on the keyboard
An instruction is given to the man-machine interface station 50 via 41, the soft key 42, or the like. The man-machine interface station 50 is an analog screen creation unit 51 that describes scaling means 12, scale lines, comments, etc.
A bias / span setting means 22 and an on / off screen creating section 52 for storing scale lines, comments and the like are provided. The analog data display unit 13 and the on / off data display unit 33 are CR
A T (cathode ray tube) 60 or a liquid crystal display is used. The operation of the apparatus thus configured will be described below. FIG. 3 is an explanatory diagram showing the flow of data. On / off instruction data to the operation end and analog data from the detection end are sent to the control station 31 at a constant cycle (for example, several seconds). Then, data is stored in time series on the magnetic disk 33 for each control unit (referred to as pen information) via the trend data collecting means 32. Here, the pen is held in the form of a pair of analog data and on / off data. Man-Machine Interface Station 50
When requested by the operator, reads the corresponding pen data from the magnetic disk 33, performs the necessary conversion, and displays analog data and on / off data as a trend screen on the CRT. FIG. 4 is an explanatory diagram of a trend screen of analog data. The vertical axis shows the variable at the detection end. Here, the analog data is unified and converted into data in which the predetermined maximum value is 100% and the minimum value is 0%. A time axis from a predetermined start time T0 to an end time T1 is provided on the horizontal axis, and the time series data is displayed as it is as a trend. When displaying multiple pens in a single graph, it is advisable to change the color for each pen. FIG. 5 is an explanatory diagram of a trend screen of on / off data. The vertical axis shows the bias value and the on / off span determined for each pen. For example, if a region for 8 pens is set, the span will be 1/8 or less, and 8 types of bias will be provided in 1/8 intervals. The horizontal axis is the time axis,
Use the same value as the analog data. This way,
The pen information on the magnetic disk 33 is chronological,
Information at a common time can be obtained by analog and on / off. FIG. 6 is a flowchart showing the operation of the apparatus shown in FIG. When the start of reading data is instructed, the man-machine interface station 50 reads pen information from the magnetic disk 33 (S10). If it is on / off data, read the pen number (S11) and select the corresponding bias value (S
12), find the span (S13), and read the time of the data (S14). From this, the bias / span setting means 22 calculates the coordinates on the screen (S15). Then, the trend screen of on / off data is displayed on the CRT (S1
6). If it is analog data, read the pen number (S2
1) Find the scaling constants such as the minimum and maximum values (S22). Then, the scaling means 12 performs a scaling operation (S23), reads the time of the data, and determines the coordinates on the screen (S24). Then, the trend screen of analog data is displayed on the CRT (S25).

As described above, according to the present invention, the trend allows the display of not only analog data but also on / off data, so that the operator can easily understand the operating state of the plant. effective. Further, by observing on / off data as an input of the control system and observing analog data as an output, there is a practical effect that information such as a process time constant and an overshoot can be easily recognized. Further, when displaying a plurality of on / off data, the bias / span setting means determines the span and the bias value for each on / off data to be displayed, so that there is an effect that it is possible to prevent the on / off displays from overlapping with each other. .

[Brief description of drawings]

1 is a block diagram showing the concept of the present invention, FIG. 2 is a block diagram showing the embodiment of the present invention, FIG. 3 is an explanatory diagram showing the flow of data, and FIG. 4 is a trend of analog data. FIG. 5 is an explanatory diagram of the screen, FIG. 5 is an explanatory diagram of the trend screen of the on / off data, and FIG. 6 is a flowchart showing the operation of the apparatus of FIG. 11 ... Analog data holding means, 12 ... Scaling means,
13 ... Analog data display section, 21 ... ON / OFF data holding means, 22 ... Bias / span setting means, 23 ... ON / OFF data display section.

Claims (1)

[Scope of utility model registration request] 1. An analog data holding means (11) for holding analog time-series data such as a state quantity of a process, and predetermined data is read from the analog data holding means, and 0 to 100 based on a predetermined value. Scaling means (12) for converting into the value of% and determining the position of the value of 0-100% and the displayed time domain on the trend screen
An analog data display section (13) for displaying the values converted by the scaling means in time series, and an on / off data holding means (2) for storing on / off data such as a command value for the operating end in the process in time series.
1) and the value stored in the ON / OFF data holding means is read out to determine the span and bias value in the ON / OFF display in the 0-100% display axis direction on the trend screen displaying the analog data, and A trend display device comprising: a bias / span setting means (22) using the same time axis; and an on / off data display section (23) for displaying the values converted by the bias / span setting means in time series. When displaying a plurality of on / off data on the data display unit, the bias / span setting means determines a span and a bias value for each on / off data to be displayed.