JPH03107724A - Storage display device for history data - Google Patents

Abstract

PURPOSE:To store and display data in detail in case of abnormality by predicting the abnormality of process data by a warning value detecting device and advancing a sampling period which is generated by a storage timing generator. CONSTITUTION:The process data is stored at a long sampling period DELTAt1 in a normal state and when a warning value is detected by absolute quantity abnormal value detection, variation quantity abnormal value detection, etc., a command is outputted to the storage timing generator 4 to switch the sampling period from DELTAt1 to DELTAt2, so that the process data is stored 5 at the fast sampling period. Then when an abnormality detector 3 detects the abnormality or makes a display at optional timing, the stored process data is converted by an editing device 6 in time series corresponding to the sampling period at the time of the storage, so that the variation history of the process data is displayed on a display device 7.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a process for storing and displaying process data such as tension, pressure, temperature, and current in a processing plant for paper, film, steel, etc. The present invention relates to a data monitoring device, and particularly to a historical data storage and display device that can store and display detailed data at abnormal times.

(Prior Art) An example of a conventional history data storage/display device is shown in FIG.

The conventional historical data storage and display device shown in FIG. 2 includes a plurality of process data detectors 1. An abnormal value detector 2 that determines and detects an abnormality in process data, an abnormality alarm device 3 that issues an alarm when process data is determined to be abnormal, and a storage timing generator that generates a timing signal for storing process data in a storage device 5 4, and an editing device 6 that edits process data to be displayed on a display device 7 when an abnormality is detected by the abnormality detector 2.

The historical data storage/display device configured as described above stores process data detected by the process data detector 1 in the storage device 5 in chronological order at a constant data sampling period generated by the storage timing generator 4. When a time period exceeding the storage capacity of the storage device 5 has elapsed, the oldest data is sequentially erased, and the latest data is always stored.

The stored process data is displayed on the display device 7 in chronological order via the editing device 6 when an abnormality occurs or at an arbitrary timing, thereby making it possible to grasp the change history of the process data at the time of an abnormality or at an arbitrary timing. can.

In this case, for example, if the process data changes as shown in FIG. 3, the stored history data will be displayed as shown in FIG.

(Problems to be Solved by the Invention) However, with the above-mentioned conventional history data storage and display device, as shown in FIG. Therefore, there will be a considerable difference between the data and the actual process data shown in FIG. 3, which will cause problems especially when analyzing the cause when an abnormality occurs. For this reason, methods are used to speed up the data sampling cycle, but with storage devices of the same capacity, the total storage time of historical data will be shorter, and in order to maintain the same total storage time, it is necessary to increase the capacity of the storage device. , it becomes impossible to store a large amount of process data due to the capacity of the storage device.

The present invention has been made in consideration of the above problems, and provides a rational historical data storage and display device that can store and display detailed historical data at the time of an abnormality occurrence without increasing the capacity of the storage device. The purpose is to

[Structure of the invention]

(Means and effects for solving the problems) In order to achieve the above object, the present invention provides a detector for detecting a 1g command value, a memory timing generator that can change the sampling period, and a storage timing generator that can change the sampling period. is a historical data storage and display device equipped with an editing device for displaying in the same time relationship, and a warning value detection device predicts abnormalities in the process data, and the sampling period generated by the storage timing generator is accelerated. By doing so, the sampling period before and after the occurrence of an abnormality is accelerated to store detailed data, and when the data is displayed on a display device, the display interval is changed by the editing device so that the data is displayed in the correct time relationship.

(Example) An example of the present invention is shown in FIG. Figure 1 shows the conventional second
A warning value detection device 8 has been added to the figure, and the rest is the same as the conventional figure 2.

In FIG. 1, a warning value detection device 8 predicts an abnormal value of process data, and when the value of the process data exceeds a set warning value, the sampling period is shortened via a storage timing generator.

The memory timing generator 4 has Δt□ and Δtz (Δ1.)
Two types of sampling periods (Δtz) can be generated.

The sampling period is set by Δ according to the output of the warning value detection device 8.
Switch from t□ to Δt8.

In the historical data storage and display device configured in this way,
The following method is used to detect a warning value for predicting an abnormal value.

■Absolute quantity abnormal value detection If the process data detected this time is above or below the set value, it is set as a warning state.

■ Abnormal value detection of variation The differential value of the process data is taken, and if the variation per unit time is greater than or equal to the set value, a warning state is entered.

Under normal conditions, process data is stored at the longer sampling period Δt, and when a warning value is detected using the method α) or ■, a command is output to the storage timing generator 4 to change the sampling period to Δt1. to Δt2, and the process data is stored in the storage device 5 at a fast sampling period.

When the abnormality detector 2 detects an abnormality or displays it at an arbitrary timing, the stored process data is converted into a time series by the editing device 6 according to the sampling period at the time of storage, and then displayed on the display device. 7 displays the change history of process data.

An example of history data displayed using the above method is shown in FIG.

In this way, historical data that is approximated by actual process data can be stored and displayed near the time of data abnormality.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to store and display detailed data around an abnormality without increasing the storage capacity of the storage device.

Although the above explanation was given for one point of process data input, it is possible to store and display multiple process data in the same way, and by comparing with other process data, it is possible to analyze the cause of abnormality, etc. can be carried out effectively.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing an example of a conventional history data storage/display device, and FIG.
4 is a diagram showing an example of actual process data, FIG. 4 is a diagram showing an example of historical data display according to the present invention, and FIG. 5 is a diagram showing an example of historical data display according to the conventional method. 1... Process data detector 2... Abnormal value detector 4... Memory timing generator 6... Editing device 8... Warning value detection device 3... Abnormality alarm device 5... Memory Device 7...display device

Claims (1)

[Claims] In a historical data storage/display device that sequentially updates and stores process data in a storage device in chronological order at a predetermined sampling period, and displays the stored data all at once on an external display device via an editing device. , a warning value detection device for detecting that the process data exceeds a set warning value, a means for shortening the sampling period according to the output of the warning detection device, and a storage time when editing data to be displayed. 1. A storage and display device for historical data, comprising means for changing a period of a time series on a display device in accordance with a sampling period of.