JPH0718213U - Trend graph display device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a trend graph display device capable of grasping where in the entire file the current display position is. [Configuration] Apart from the usual trend display 7a of the CRT display, provided an indicator 7b, the proportion of this indicator 7b, to the size M _a of the total file size M _R from the head position of the file to the graphical display position Display M _R / M _a in a strip shape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a trend graph display device for a system for monitoring and controlling a plant.

[0002]

[Prior art]

 In order to monitor and control the plant, signals from multiple points are captured, these are stored in the data storage memory for each channel, and the trend data is displayed on the CRT display in real time, or from the present time to the past. Scrolling the display range at a certain point to display past trend data is more commonly performed than before.

[0003]

[Problems to be solved by the device]

 However, in the conventional trend graph display device described above, although past data can be displayed by scrolling, the operator does not know how much file amount is in the memory currently set, and the current display portion being scrolled is not displayed. There was a problem that it was very difficult for the operator to know at which position in all the files, and therefore how much scrolling could be used to display the target date and time data.

The present invention has been made in view of the above problems, and provides a trend graph display device capable of grasping to which position in all files the current display position belongs during trend display. Is intended.

[0005]

[Means and Actions for Solving the Problems]

 In the trend graph display device of the present invention, in which the input data of a plurality of channels are sequentially captured and stored in the data storage means, the trend data of each channel can be displayed on the two-dimensional display and the display range can be moved. An indicator showing which position of the entire file data stored in the data storage means corresponds to the current display position on the two-dimensional display is provided.

In this trend graph display device, an indicator during trend display shows which position of all files the current display position is. As you scroll, the current display position for all files also changes. Therefore, it is possible to determine how many times the current display range should be scrolled to reach the target, based on the size of the current display range and the degree of change in the current display position for all files.

[0007]

【Example】

Hereinafter, the present invention will be described in more detail with reference to examples. FIG. 1 is a block diagram showing the configuration of a monitoring system in which the present invention is implemented. The monitoring system, for example, signals from the plant each place I _1, I _2, ..., accept the I _n, these signals I _1, I _2, ..., a multiplexer 1 to a time division output I _n, a multiplexer 1 signals I ₁ to time are sequentially input, ..., and a / D converter 2 for converting an I _n the digital signal, data capture, calculation, and CPU3 executes the control to be used in the display or the like, various kinds of data It is provided with a key input unit 4 for inputting, setting, etc., a ROM 5 for storing a program of the CPU 3, a fetched data RAM 6, and a CRT display 7 for displaying a trend of data. A semiconductor, a floppy disk, or the like is used as the RAM 6 for data storage, but it may be mechanically fixed or removable. The CRT display 7 may be any other two-dimensional display such as a liquid crystal display panel, as long as it can display a trend.

In the monitoring system of this embodiment, during normal monitoring, each channel data I ₁ , ..., I _n is stored in the RAM 6 under the control of the CPU via the multiplexer 1 and the A / D converter 2. At the same time, the trend is displayed on the CRT display 7. Therefore, the display screen of the CRT display 7 is displayed while tracking the latest current value.

As shown in FIG. 3, the display screen of the CRT display 7 is composed of a normal trend display screen 7a and an indicator 7b for displaying the position of the current display screen for all files. The indicator 7b displays the ratio M _R of the entire file from the head position of the file to the current graph display position, and M _a corresponding to all files is constant, but the ratio M _R / M _a is currently The display position changes depending on whether it is close to the start position or the latest measurement data. The ratio M _R / M _a , that is, the shaded portion, is not a ratio to the entire display range in which the graph is displayed, but a ratio to the whole from the head position of the file to the graph display position.

When the device enters the display timing and the data is displayed on the display screen 7a, the indicator display processing routine is started. In this routine, first, store the data capture size M _a of the memory file (step ST1), then the current conducted uptake display position M _R (step ST2), and the size M _a of the entire file , The size M _R from the front position to the current display position is compared, the ratio M _R / M _a is calculated (step ST3), and a display corresponding to the ratio is displayed on the indicator 7b (step ST4). To return.

In the above embodiment, the ratio is only displayed in the form of a band graph, but in order to make it easier to visually understand, the numerical value of the ratio and the time (oldest time in the file) are displayed. , The latest time, and the time at the beginning position of the graph being displayed) may be displayed. Further, a triangle mark or the like may be placed as shown in FIG. 4 to indicate the current position display portion of the indicator.

[Device Name] According to this device, it is possible to know where the current display position is for all files. Therefore, even though the number of hours of data that can be stored in the entire file changes depending on the collection interval, this invention indicates the relative position, so it is easy to know when to start collecting data. It is possible to know and to easily move the trend graph.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a plant monitoring system in which the present invention is implemented.

FIG. 2 is a diagram showing a display screen of a CRT display of the surveillance system.

FIG. 3 is a flowchart for explaining an indicator display processing operation in the same monitoring system.

FIG. 4 is a diagram showing another example of an indicator.

[Explanation of symbols]

 7a Trend display screen 7b Indicator for displaying the current display position

Claims (1)

[Scope of utility model registration request] 1. A trend graph display device capable of sequentially capturing input data of a plurality of channels, storing the data in a data storage means, displaying trend data of each channel on a two-dimensional display, and moving the display range, A trend graph display device comprising an indicator showing which position of all file data stored in the data storage means corresponds to the current display position on the two-dimensional display.