JPS63300913A - Recording device for process quantity trend - Google Patents

Abstract

PURPOSE:To recognize instantaneously the quantity of a process quantity which is displayed as a trend graph by recording a quality code in recording data together with the process quantity. CONSTITUTION:Process quantities of respective parts of a plant 1 are read in a storage device 3 through an input device 2 and a limit value and determined quality for deciding the quantity of a specific process quantity are stored. A quality handling means 4 determines the quantity of a process quantity according to the comparison result between the process quantity and limit value and the state of process hardware which inputs the process quantity. Then a process quantity output position determining means 5 determines a position where the stored process quantity is recorded out. Then the variation of the quality code of the stored process quality is detected 6 and the output position of the quality code is determined 7 at the time of the variation corresponding to the position where the process quantity is recorded out. Thus, the quality code indicating the quality is recorded out 8 in the trend graph.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is a plant monitoring control system that records and outputs a predetermined process amount to be monitored to a record output device such as a trend recorder or a CRT display device. The present invention relates to a process amount trend recording device suitable for recording.

(Prior art) In general, in a plant monitoring and control system using a computer, among the various process quantities obtained from detectors placed in each part of the plant, important process quantities are examined for changes in process quantities from the past to the present. By continuously recording and displaying the information on a trend recording device such as a trend recorder or CRT display device, it is used for analyzing future trends and the causes of past plant abnormalities.

(Problems to be Solved by the Invention) However, in the conventional trend recording device, even if an abnormal portion that is held at the upper limit or lower limit appears in the trend graph of the process amount recorded and displayed therein, Is it really due to an abnormality in the plant, or is it due to an abnormality in process hardware such as a detector or input device?

It cannot be determined from the process amount alone, and there are problems that require extra effort, such as the validity of the process amount and its quality must first be judged in order to analyze the cause of plant abnormality or analyze future trends. Ta.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a process quantity trend record@device that allows the quality of process quantities displayed in a trend graph to be immediately recognized.

[Structure of the Invention] (Means for Solving the Problems) The present invention determines the quality of the process quantity based on a comparison between the process quantity and a limit value and the state of process hardware such as a detector and an input device. .

This change in quality is detected, and a quality code representing the quality of the process quantity is recorded and output at a predetermined position on the trend graph of the recorded process quantity.

(Function) Thereby, a quality code is attached to the trend graph of the process amount recorded and output to the trend recording device according to the abnormality of the plant or the abnormality of the detector. Therefore, operators can know the quality of process quantities just by looking at the recorded data, and can accurately analyze the causes of plant abnormalities and future trends without requiring extra effort.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a process quantity trend recording device showing an embodiment of the present invention. In order to monitor the process status of each part of the power plant 1, a predetermined input point is provided for each monitoring input point. Detectors are arranged. The process quantity V output from each of these detectors is periodically scanned via the input device 2, converted into a digital quantity V in engineering units, and stored and updated in the storage device [3]. At the same time, the state V of each detector is also taken into the input device 2, and the state 11II1 of the process hardware, including the state of the input device fi2, etc., is stored in the storage device 3. Also, this memory device [! ! In 3.

Upper limit values Lt, h and lower limit value Lt12 for detecting an abnormality in the detected value are also stored.

The quality hurdling means 4 stores the process amount V stored in the storage device 3, the state V' of the process hardware at the time of scanning, the upper limit value Lth for detecting sensor abnormality, and the lower limit value IJQ in the storage device 3. Read from 3,
Determine the quality code q for each monitoring input point and store it in the storage device 2.
Save to.

The quality codes q include Bad, Poor, Suspect, Good, etc., and the contents of these will be explained below.

A "bad" state means a disconnection of a thermal lightning pair, an overflow of a detection point, a failure of an input device, a scanning exclusion by an operator, etc., and mainly indicates a state where the cause of the abnormality is in process hardware.

Poor refers to the state in which the obtained process quantity deviates from the sensor range 6 For example, if the upper limit Lth of the process quantity is 4 mA and the value of the process quantity is 0IIIA, then this is outside the sensor range. This means that there is an abnormality in the detected value.

Suspect () is an input where the temperature of the reference lens block is input for a state where the input value is set to a constant value by a transposition, or an input point where a process quantity is measured using a thermal lightning pair. It means a state where an abnormality occurs at a point and the reference temperature is set by a constant.
Indicates that the value of the process amount may be different from the actual value.

Good is a value that was actually scanned, meaning that there is no abnormality in the sensor, process hardware, etc., and indicates that the value is reliable.

FIG. 2 shows the operation of the quality handling means 4 in the form of a flowchart. First, it is determined whether the process amount input value has been set by the operator as described above (401), and if it has been set, the quality code q is set to suspect (402).

Next, the state of the input device is determined (403), and if there is an abnormality, the quality code q is set to bad 8 (404).

Next, using the process amount V, the upper limit value Lshih and the lower limit value Lt, I2 for detecting an abnormality in the detector, the state of the detected value is determined based on whether the following equation holds true (405 )
.

Lt Q <V ≦Lt, h
-' (1) If the formula (1) does not hold, the quality code 9 is set as a detection value abnormality.
Next, it is necessary to determine whether the reference temperature is set as a constant for the thermocouple input as described above (407).
If the reference temperature is set as a constant, the quality code q is set to Suspect S (40g), and if not set, it is set to Good G (409).

Take out the process amount V and quality code q stored in the device 1!3 and record the process amount in the output bag r1
The output level Mv' for recording and outputting to 18 is determined.

The quality code change detection means 6 detects that the quality code 9 of the process amount stored in the storage device 3 has changed. The quality code output position determining means 7 determines the quality based on the output position of the process quantity determined by the process quantity output position determining means 5 when the quality code detected by the quality code change detecting means 6 changes. Record and output device for code! 8. Determine the output position. The recording output device 8 records the process amount V determined by the process amount output position determining means 5.
When the quality code changes, the quality code output position determining means 7 determines the output position. Character code data C representing quality code q is recorded in 9'.

FIG. 3 shows the above-mentioned means 5, 6.7, the storage bag [13] and the recording output device l! 8, the storage device f
3 includes a process amount data file and a character data table. Each monitoring input point A is included in the process amount data file.
For each, the lower limit range Vo, upper limit range V1*O, current value ■, and previous code q for process amount record display. , this time data consisting of code q is saved. Further, character data B, S, P, and G for displaying bat, suspest, poor, and good are stored in the one-character data table. Furthermore, as described above, this storage device 3 stores upper and lower limit values L11. h, LtQ, process hardware status V, etc. are also stored,
Since these data are unnecessary for the explanation of FIG. 3, they are omitted from illustration.

In the process amount output position determining means 5, first, the upper/lower limit range Vl <111. VIJ as a memory bag [
3 (501), then based on the read process amount V and upper/lower limit ranges V+ o o, Vu.

Display output level 1i! For example, the following formula is used as a conversion formula for calculating V' (502).

(However, 0≦V'≦100%) The calculated V' is notified to the recording output device 8, and is recorded and output.

In the quality code change detection means 6, first, the memory bag [3
The quality code q determined during the previous scan of the monitoring input point A stored in . The quality code q determined during the current scan is read out (601).Next, these 9 and qo are compared, and if they are equal, the quality change index i is set to 0'', for example, and if they are not equal to 1, it is considered that there is a change. The quality change index i is set to Pa1'' (602).

The quality code output position determination means 7 reads the quality change index i determined by the quality code change detection means 6 and checks the value (701).

As a result, if the quality change index i is II OH, it is assumed that there is no change in quality, and the subsequent processes 702-
Bypass 703. If the quality change index i is 1", the current quality code q and the character data table stored as quality output data are read from the memory device @3, and the output character code data C corresponding to the current quality code q is output. (702), and then determines the output position q' of the quality output character code C (703).Generally, in a trend recorder, 0%, 10
In many cases, data cannot be recorded outside the output position range corresponding to 0%, and.

Since it is important for the operator to recognize that the output character code C should be output near the output position @v' of the process quantity data at that time, it may be placed above (or to the right of) it depending on the value of the data output position V'. It is necessary to decide whether to output it or to output it below (or to the left of) it. The above process (
703), the character code output position switching limit value α stored in the storage device 3 for the determination and the bias for determining how far in advance from the data output position av' should output the output character code C. Memorize the value β! ! ! Based on these values read from step 3, the output position q' of the output character code C is determined by the following formula.

When V'≧α, q' = v' −β...(2)
When v'< α, 9'=v' +β...(3)
The determined output position q' is the recording output device f! 8, and the output character code C is recorded and output at that position.

FIG. 4 shows an example of recording by the recording output device 8. In FIG.

The trend curve X has a quality code of Goo during recording.
An example is shown in which the status changes from d to Poor and returns to Good after a certain period of time. Similarly, the trend song By is an example where the quality code changes from Good to 5uspect for a certain period of time, and the trend song By is an example where the quality code changes to Good.
An example is shown in which the status becomes Bad for a certain period of time from d. In these examples, changes in the quality code are captured and a record display indicating the quality code is performed. At this time, the left end of the character indicating the quality code indicates the timing of the quality state change. Further, as in the trend curve X, when the recording position reaches the upper limit of the recording span and the quality code cannot be recorded above the process amount, it is recorded below.

In the above embodiment, a trend recorder is used as the record output bag [8], but it goes without saying that the present invention is also applicable to trend graph display on a CRT display device.

[Effects of the Invention] As described above, according to the present invention, since the quality code is recorded together with the process quantity in the recorded data of the trend recording device, the operator can know the quality of the process quantity just by looking at the recorded data. Since there is no need to refer to the output status of other process quantities, the burden during processing such as plant abnormality cause analysis is reduced.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram of a process amount trend recording device showing an embodiment of the present invention, FIG. 2 is a detailed explanatory diagram of the quality handling means in FIG. 1, and FIG. 3 is a detailed explanation of a part of FIG. 1. 4 are trend curve diagrams showing an example of recorded data recorded and displayed from the display output device of FIG. 1. FIG. DESCRIPTION OF SYMBOLS 1... Power plant, 2... Input device, 3... Storage device, 4... Quality handling means. 5... Process amount output position determining means, 6... Quality code change detection means, 7... Quality code output position determining means, 8... Recording output device. A- Fig. 1 Fig. 3 Regrettable 1 Fig. 3 Fig. 4

Claims (1)

[Claims] In a process amount trend recording device that reads process amounts of each part of a plant into a storage device via an input device, and records and outputs the process amounts read into the storage device as a trend curve from the past to the present to a record output device, the storage device In addition to the process quantity, process hardware stores at least a limit value for determining the quality of a predetermined process quantity and the determined quality, and inputs the comparison result of the process quantity and the limit value and the process quantity. quality handling means for determining the quality of the process quantity based on the state of the process quantity; process quantity output position determining means for determining the position at which the process quantity stored in the storage device is to be recorded and outputted to the recording output device; quality code change detection means for detecting a change in the quality code of a process quantity stored in a storage device; and said process quantity output position determining means when the quality code detected by said quality code change detection means changes. 1. A process quantity trend recording device characterized by comprising: a quality code output position determining means for determining a position at which a quality code is recorded and output in correspondence with a recording output position of a process quantity determined in .