JP2680214B2 - Process monitoring system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operator's console of a distributed digital control system for controlling a process, and more particularly to a trend display system of a CRT display device for displaying plant data in a trend graph in a time series.

[0002]

2. Description of the Related Art When monitoring and controlling a plant, temperature,
Process data such as pressure is an important factor for grasping the operating status of the plant. For this reason, the process data is displayed on the CRT display device in a format simulating an instrument, and the change over time is displayed as a trend graph. For example, Hitachi Unitrol EX-1000 series ES “System Overview” (ES3599-006 19
Issued in March 1988) As shown in 18, when the detailed screen of the instrument is displayed, the trend recording of the display process data of the instrument is started, and while displaying and operating the instrument,
We are trying to understand the operating status of the plant.

As another example, Japanese Patent Laid-Open Publication No.
As described in −309200, hold all process data inputs in a time series for a certain period of time, and set the time series process data inputs that were held at the time of the alarm and the process data inputs that are periodically updated. There is also a method of displaying a trend graph together.

[0004]

In the first known example described above, the trend graph is started to be displayed when the detailed screen of the instrument is displayed, and therefore the trend graph before the detailed screen is displayed is not displayed. This means that, for example, when an abnormal state occurs in the plant, the state before the detailed screen is not displayed even if the detailed screen is displayed in an attempt to check the states before and after the abnormal state. Also,
Only the trend graph of measured values, set values, and operation values for the displayed instrument can be displayed, and the trend graphs of related instruments cannot be referenced at the same time. An object of the present invention is to instantaneously switch to a trend graph display including the past data from the present when the operation of switching the current data display of the plant to the trend graph is performed on the screen for monitoring and operating the instrument. Another object of the present invention is to provide a process monitoring system capable of displaying a trend graph on a plurality of instruments shown in a plurality of divided areas of a display screen. Next, the above-mentioned second known example is
All process data inputs are held in time series for a certain period of time, and the process data held at the time of the alarm is displayed in a trend graph, so the state before the alarm is issued can be known to some extent. But the number of sensors
When applied to a large-scale plant such as several hundreds to several thousands, frequent alarms increase the number of data points to be collected periodically, and the data amount of information to be processed depends on the information processing capability of the device. Will exceed. Especially,
Data acquisition is carried out at a controller, in distributed digital control system for transferring the operator's console communication rise of the communication load becomes a bottleneck, monitoring of data, which may inhibit the action of the original key features. Also, if an alarm occurs, if you can know the trend graph before and after the alarm for the related process data,
Although it is effective in analyzing the cause and taking countermeasures, in this known example, the trend graph before and after the alarm is issued can be known only by the process data that issued the alarm. An object of the present invention is to prevent a steady communication load from increasing even by displaying a trend graph including process data from the present to the past in a distributed digital control system, and at the time of alarm generation and operator's request. A process monitoring system that can accumulate time-series process data from a certain time by operation, and can display a trend graph including process data for any instrument displayed in multiple divided areas of the controller display screen. To provide.

[0005]

A feature of the present invention for achieving the above object is to provide a display for displaying an operating state of a plant.
Plant operation status display means with multiple areas,
Both of the instruments displayed on the plant operating state display means
Operation signal input hand to instruct operation and switching of display state
Step and the process of operating conditions that can be displayed in each of the display areas.
Multiple display process data storage means for storing data
And the operator's console, including multiple
Process data input means for collecting data and the process
Of multiple process data input to the data input means
Multiple collected process data, each stored for a certain period
And a controller including a storage means,
Displayed by the instruction to switch the display state from the signal input means.
The collection process data corresponding to the operating state to be switched
The data stored in the data storage means is displayed on the display process data.
Batch transfer to the data storage means and display of the plant operation status
It is to display it as a trend graph by means .

[0006]

When the trend switching operation is performed on the instrument displayed on the display screen, the trend display is not started from the data at that time, but the data currently collected in the FIFO buffer in the controller up to that time. Since the time-series data of multiple past process points are fetched and displayed as trend display data, and the trend display is updated with the data collected periodically thereafter, the operator includes the past data from the time the trend is switched. The trend graph can be viewed immediately and can be monitored continuously, making it easy to understand the operating status of the plant. Also, when an alarm is issued or an operation is performed by the operator, the time-series data for a certain past period is stored in the second data buffer in the controller, and the second operation is performed when a certain condition such as the operator's display operation The data buffer can be collected in the operator's console and displayed as a trend graph, which is useful for analyzing abnormal conditions. In addition, since time series process data is stored for each detector in the controller, it is sufficient to collect data from the controller to the operator's console at that time only for the instruments for which the trend switching operation has been performed, increasing the communication load. Never.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 6 is an overall configuration diagram of a system to which the present invention is applied. An operator's console 1 having a CRT display device 2 and an operation input device 3 exchanges data with a controller 5 via a communication device 4. The controller 5 collects process data from the plant 7 via the detector 6.

FIG. 1 shows an embodiment of the present invention. The controller 5 periodically collects process data from the plurality of detection ends 6 via the process input device 51. The collected data are input to the FIFO buffers 52a, 52b, ... Corresponding to the respective detection ends 6, and the buffer contents are periodically updated. If the number of storage points in the FIFO buffer is N, then past data of cycle × N is always stored in the buffer. It should be noted that the data of the N-th point is each of the update, be discarded. Further, the collected data is transmitted to the operator's console via the communication device 4 according to the request from the operator's console 1. The operator's console 1 receives the data via the communication device 4, converts the data into the instrument display format by the converter 13a, and then the switching device 1
The display data is delivered to the display control device 15 via 4a. As a result, the display is displayed in the screen division area of the CRT display device 2 in a format simulating an instrument. On the other hand, one storage memory 11 is assigned to each of the plurality of divided areas on the screen. The storage memory 11 has a capacity for storing collected data for N points and stores data for displaying a trend graph. The touch screen 31 is used for switching instrument displays and the like. The operation input device 32 is for performing various operations on the displayed instrument. Now, the example trend display switching of the instrument with displayed is designated by the touch screen 31, FI detectors corresponding to the meter controller 5 via the operation input control unit 16
A batch transfer of FO buffer contents is requested. For example, F
When a request is made to the IFO buffer 52a, the data is sent to the operator's console by the batch transfer device 53a. Next, the contents of the FIFO buffer are accumulated in the storage memory 11 by the batch setting device 17a in the operator's console.
a. On the other hand, the switching device 14a is the collective setting device 17
Since the x side is selected when a stores data in the storage memory 11a, the data stored in the storage memory 11a is converted into a trend graph by the trend converter 12a and then input to the display controller 15 for CRT display. Device 2
Press to switch the instrument display to the trend graph. The storage memory 11, the trend converter 12, and the converter 1 described above
3. The switching device 14 is necessary for the number of instruments displayed on the screen. In the present embodiment, 16 instruments are displayed at the same time, so 16 sets may be prepared for each. When the trend display switching is instructed, the process data of the past N points from the present is stored in the storage memory 11, and thereafter, the storage memory contents are updated every time the operator's console periodically reads out the data in the controller. In this way, after the trend display is switched, the process data from the present to the past N points is always stored.

Next, the display operation of the instrument screen and the trend switching display will be specifically described with reference to FIGS. FIG. 2 shows the CRT display device 2 by simulating an instrument. The screen is divided into 16, and meters 211 to 218 and 221 to 228 are arranged in the respective divided areas. Each instrument has a unified display format for each type, such as controller, indicator, and process controller.
When creating a loop instrument corresponding to the detection end,
Instrument type, tag number. , Service name, scale, detection end No. It is sufficient to specify parameters such as. Therefore, there is not a single type of screen in which the instruments 211 to 218 and 221 to 228 are arranged, but the combination of instruments is stored as a parameter for each screen, and such a screen is switched to specify, for example, 2 1,048 screens can be displayed. The operation input device 32 is for instructing various operations on the displayed instrument. Key 321
Is the upper / lower instrument, that is, the instruments 211 to 218,
Which of the meters 221 to 228 is operated is selected.
A line 23 is displayed on the selected row. Key 323, 32
There are 8 sets of 4,325, 326, and each set corresponds to the instrument of the selected stage immediately above it one to one. Key 32
Press 3 to display the instrument detail screen. The key 326 switches the mode of the instrument, and switches the mode of the instrument to automatic / manual each time the key is pressed. When the instrument mode is automatic, pressing the key 322 while pressing the key 326 alternates the mode to cascade / auto. Key 32
Reference numerals 4 and 325 are used when changing the control target value or the operation output value of the instrument, and the value is increased by pressing the key 324 and decreased by pressing the key 325. The control target value can be changed when the instrument mode is automatic, and the control output value can be changed when the mode is manual.

Next, the trend display switching operation will be described. FIG. 3 shows the instrument 211 in FIG. Any loop instrument may be used, and for example, any of the instruments 211 to 218 and the instruments 225 to 228 in FIG. 2 may be used. 91 is a measured value , 92 is a control target value, 9
8 is an operation output value. Reference numeral 93 is a bar graph scale, 94 is a measured value bar graph, 95 is a measured target value bar graph, and 96 is an alarm set value bar graph. Reference numeral 97 is a mark for displaying the position of various set values, and 99 is a display of the instrument mode, in which characters corresponding to the selected mode are highlighted. The touch detection area of the touch screen is defined corresponding to the divided display area on the screen. In FIG. 3, 211A is a trend display switching area, and 211B is a detailed screen display area. When a touch operation is performed within the range of 211A,
Since the trend display switching command has been issued to the displayed meter 211, the display mode of the meter 211 'is switched. P
₁ , P ₂ , ... P _N is the trend data of the measured value, P ₁ is the current value, P ₂ is the value one cycle before, and _PN is the data before (N-1) cycles in the same manner. . Here, since the trend display time width is the product of the number of data N and the data collection period, if N is 60 and the data collection period is 2 seconds, 60 ×
It takes 120 seconds in 2 seconds. The display is updated at the data collection cycle or at an integral multiple of the data collection cycle . here,
When touch operation is performed in the range of 211A, the instrument 211
Display in the style of. Next, when the touch detection area 211B is touched while the instrument 211 is being displayed, the display is switched to the instrument detail screen 23. Detail screen 2
In 4, it is possible to change the proportional band for control operation adjustment, the integral time, the derivative time, the alarm set value, and various other parameters. At the same time as the screen display, the measured value,
Start trend display of control target value and operation output value. When the touch operation is performed on the area 241A surrounded by the dotted line while the detailed screen 23 is displayed, the meters 211 to 218, 221 to 22 are displayed.
The display screen is switched to 8.

As described above, according to this embodiment, it is possible to provide an easy-to-use trend display system suitable for plant operation. The operator monitors the operation of the plant by displaying the operation screen shown in FIG. 2 on the CRT display device. At this time, since the operator touches the bar graph portion of the instrument to immediately switch the instrument display, it is possible to easily confirm whether or not the operating condition is good. Further, if necessary, it is possible to perform operations such as setting values on the same screen. According to the present invention, for example, when an abnormality occurs in the plant data displayed on the monitored instrument, the trend data for the past several minutes can be immediately displayed by touching the instrument, and the progress of the abnormality can be known. be able to. Also, the trend display can be switched in the same way for all loop instruments, so the related plant data can be switched to the trend display, which can be useful for analyzing abnormalities and countermeasures, and a series of operations can be displayed on the instrument operation screen. Therefore, the operation is easy. Furthermore, while enabling trend display switching of all loop instruments, the steady load of communication of process data for display is not increased. That is, when the trend display switching operation is performed, the accumulated process data at the N points are transferred by communication, but after that, only the periodic process data transfer required to display the instrument is sufficient. This depends only on the number of instruments displayed on one screen at the same time. For example, if there are 16 instruments, a communication load corresponding to the instrument display for 16 instruments or more does not occur.

FIG. 4 shows another embodiment of the present invention. In addition to the FIFO buffer 52 in the controller 5, the second storage buffer 54, the FIFO buffer 52 to the storage buffer 5 are provided.
4 is provided with a memory transfer device 55, a process data abnormality detection device 56, a delay timer 57, and a transfer source switching device 58. A plurality of the respective devices are provided so as to correspond to the detector 6 in a one-to-one manner, but they are omitted in the drawing.

The memory transfer device 55 is activated under an arbitrary condition, and stores the contents stored in the FIFO buffer 52 at that time as they are in the accumulation buffer 54. Accumulation buffer 54
The data stored in is selected by the transfer source switching device 58 by an operation from the touch screen 31, and is transferred to the batch transfer device 5.
At 3, the data is transferred to the storage memory 11 in the operator's console and can be displayed as a trend graph on the display device 2. However, when displaying the data in the storage buffer 54, the storage memory is not periodically updated. The method of activating the memory transfer device 55 is as follows: the touch screen 31 of the operator's console or the operation input device 32.
There is a method by the operation of the operator from the above and a method of automatically judging the state of the process data. The upper limit set value, the lower limit set value, the change rate set value, and the like, which are the criteria for determining the data as abnormal, are preset in the process data abnormality detection device 56. The process data abnormality detection device 56 monitors the process data every cycle, and outputs an abnormality detection signal when the process data exceeds the upper and lower limit set value or the change rate set value range. The abnormality detection signal is given as a start signal of the memory transfer device 55 via the delay timer 57. The delay timer 57 is for determining the data collection time after the occurrence of an abnormality. For example, assuming that the FIFO buffer 52 has accumulated 600 seconds of data, if the delay timer 57 is set to 0 seconds, the accumulation buffer 54 stores 600 seconds of data before the occurrence of an abnormality. Also, if the delay timer 57 is set to 300 seconds, it will be 30
Data of 0 seconds and 300 seconds after the occurrence of abnormality is stored.

Now, when the process data from a certain sensor becomes abnormal, the process data abnormality detection device outputs an abnormality detection signal. The abnormality detection signal is transmitted to the alarm display device 18 via the communication device 4. In the alarm display device, since the alarm name corresponding to each abnormality detection signal is registered in advance, it is possible to display the alarm name of the process data in which the abnormality has occurred at the upper display position of the CRT display device 2. Indicates the location of the plant abnormality. Therefore, the contents of the FIFO buffer 52 are displayed by displaying the corresponding instrument and switching to the trend graph, and the operator can know the process leading to the abnormality.

On the other hand, the delay timer 57 is activated by the abnormality detection signal.
Is activated and the contents of the FIFO buffer 52 are automatically saved in the accumulation buffer 54 after a certain time has elapsed from the occurrence of the process abnormality. Therefore, when the operator displays the corresponding instrument and instructs the display of the accumulated trend data, The data transfer source switching device 58 selects the storage buffer 54 side, and the trend graphs before and after the time when the abnormality occurs are displayed.
In this way, even if the operator cannot immediately confirm the details of the abnormality, a display for confirmation can be made later.

The storage buffer 54 is not provided in the FIFO.
If the current time series data is not displayed even with the buffer 52 alone, the operation described above is possible. In this case, the accumulation buffer 54, the transfer source switching device 58, and the memory transfer device 55 are not provided in the configuration of FIG. 4, the data update stop device 59 is provided in the FIFO buffer 52, and the FIFO buffer 52 of the FIFO buffer 52 is connected by the path A shown by the dotted line. Configure to stop updates.

FIG. 5 shows still another embodiment of the present invention in which an alarm-related screen command device 19 is provided in the operator's console. The alarm-related screen command device 19 displays an abnormality detection signal and a display screen No. A correspondence table indicating whether one screen is automatically displayed is provided. Some of the important signals among the abnormality detection signals are displayed in the correspondence table of the alarm-related screen command device 19 as the display screen No. Is registered, and the screen automatic display designation is set to “present”.

When the process data from a certain sensor becomes abnormal, the process data abnormality detection device 56 outputs an abnormality detection signal. The abnormality detection signal is transmitted to the alarm display device 18 via the communication device 4, and the alarm name is displayed on the CRT display device 2. Further, the abnormality detection signal is given to the alarm-related screen command device 19. This alarm-related screen command device 19 has a display screen No. 1 corresponding to the abnormality detection signal. Is registered and the automatic screen display designation is “present”, the alarm-related screen command device 19 outputs a screen display command. This screen display command has the same function as when the operator selects a screen from the operation input device and performs a trend switching operation. The display device 2 displays the screen corresponding to the process abnormality and the trend graph when the abnormality occurs. Is displayed. If it is not desired to switch the screens automatically, the switch 191 is cut off in advance.

In this embodiment, when the current time series data is not displayed, the storage buffer 5
4. By not providing the transfer source switching device 58 and the memory transfer device 55, but by providing the data update stop device 59 in the FIFO buffer 52, the data update is stopped and the trend graph before and after the abnormality occurs is automatically displayed on the screen. It is also possible to change the setting of the alarm-related screen command device 19,
By removing the data update stopping device 59, it is possible to automatically display the current time series data.

As described above, according to this embodiment, when an abnormality occurs in the plant, the trend graph of the process data before and after the abnormality occurrence can be displayed, which is useful for analyzing the abnormal state. Moreover, since the time series data of the process data at an arbitrary time can be stored by the operation of the operator, it can be used for improving the operating method.

[0021]

According to the present invention, it is possible to instantly switch to the trend graph including the data of a plurality of points from the present to the past on the screen for monitoring and operating the instruments. It is effective for investigating the cause when it occurs.

Further, since it is possible to switch the trend display for any of the plurality of displayed instruments, data relating to the abnormality can be easily investigated. Further, while satisfying the above-mentioned functions, the steady load of communication when transferring data is not increased.

Since the touch screen is used as the trend display switching operation means, the trend display switching operation can be performed by a simple operation of touching the bar graph display portion of the display instrument, which reduces the burden on the operator. can do.

[Brief description of the drawings]

FIG. 1 is a functional configuration diagram showing an operation principle of an embodiment of the present invention.

FIG. 2 is an example of an operation screen and an operation input device to which the present invention is applied.

FIG. 3 is an explanatory diagram of a trend display style and a trend display switching operation.

FIG. 4 is a functional configuration diagram of another embodiment of the present invention in which a second accumulation buffer is provided in the controller.

FIG. 5 is another embodiment of the present invention, and is a functional configuration diagram when an automatic display device for alarm-related trend graphs is provided in the operator's console.

FIG. 6 is an overall configuration diagram of a system to which the present invention is applied.

[Explanation of symbols]

1 ... Operator's console, 11a ... Storage memory, 1
2a ... trend converter, 2 ... CRT display device, 31 ... touch screen, 32 ... operation input device, 4 ... communication device,
5 ... Controller, 51 ... Process input device, 52a ...
FIFO buffer, 6 ... Detector, 7 ... Plant.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Matsumoto 832 Nagakubo, Horiguchi, Katsuta City, Ibaraki Prefecture 2 Hitachi Measurement Engineering Co., Ltd. (56) Reference JP-A-3-294995 (JP, A)

Claims (5)

(57) [Claims] The method according to claim 1] display area for displaying the luck rolling state of the plant
A plurality of plant operation status display means, and at least the front
Operation of the instrument displayed on the plant operating status display means,
And operation signal input means for instructing switching of the display state ,
An operator's console including a plurality of display process data storage means for storing process data of an operating state that can be displayed in each display area, a process data input means for collecting a plurality of process data, and input to the process data input means Multiple
Multiple records that store each of the process data for a period of time
And a controller that includes a collection process data storage means
And the instruction to switch the display state from the operation signal input means is given.
From the collection corresponding to the operating state for which the display should be switched
Display the data stored in the process data storage means
Batch transfer to process data storage means
A process monitoring system characterized in that it is displayed as a trend graph by means of a status display means . 2. The process monitoring system according to claim 1 , wherein the process data input means is input to the controller.
Anomaly detection by detecting anomalies in multiple process data
Equipped with multiple process data abnormality detection means that emit signals
The operator's console receives the abnormality detection signal.
The process data information for which an error has been received.
A process monitoring system, comprising: an alarm display unit for displaying the operation state display unit . 3. The process monitoring system according to claim 2
In the controller, the collecting process data storage means
The contents of the process data saved by the
After a certain period of time since the abnormality detection means issued the abnormality detection signal
Multiple pre-collection process data storage means to be stored in
, The preliminary collection process is instructed by the operation input means.
Data stored in the process data storage means
Transferred to the display process data storage means, before Symbol Plan
A process monitoring system characterized by displaying a trend graph by means of operating status display means . 4. The process monitoring system according to claim 3,
The pre-collection process data storage means is
A process monitoring system characterized by being provided in each of the process data storage means . 5. The process monitoring system according to claim 2
The operator's console to the abnormality detection signal.
Corresponding alarm-related screen command means, and the alarm-related screen command means receives the abnormality detection signal.
At this time, an instruction to switch the display is issued, and operation in which an abnormality is detected
Stored in the collected process data storage means corresponding to the state
Collected data in the display process data storage means
It is transferred and the trend graph is displayed on the plant operation status display means.
A process monitoring system characterized by displaying as