JPH03165218A - Plant monitor - Google Patents

Abstract

PURPOSE:To improve monitor performance by displaying a caution signal in the case that the changing ratio of a signal in a normal area exceeds a prescribed value. CONSTITUTION:As to a signal inputted through a process inputting device 1, it is judged by an alarm processing part 14 whether or not a signal value is abnormal, and then, in the case that the value is abnormal, the abnormality alarm is outputted by an alarm state outputting part 6. On the other hand, the change in the signal is detected by a change detecting part 171, and in the case that the signal value is normal but the changing ratio exceeds the prescribed value, the caution signal is displayed on a CRT display unit 8 through a display processing part 10.

Description

[Detailed Description of the Invention] [Purpose of the Invention (Industrial Application Field) The present invention aims to improve monitoring performance by closely monitoring process quantities input from each part of the plant in order to monitor plant conditions. Regarding plant monitoring equipment (Prior art) In general, in industrial plants, signals from sensors placed in various parts of the plant (hereinafter referred to as plant sensor signals) are input and processed, and are displayed as a plant status display screen on a CRT display. While displaying.

Plant operators refer to fluctuations in plant sensor signals displayed on this CRT display.

Monitoring the plant. Regarding alarm monitoring, a limit value is set for each plant sensor signal, and the limit value is used to classify the signal into a normal state and an alarm state (limit value deviation). A method is adopted in which warnings are divided into two stages by classifying them into first limit value deviation and second limit value deviation.

Furthermore, there is a method of using the first limit value deviation as a predicted limit value to predict that a second limit value deviation will occur in the near future, and by combining logic with surrounding related signals,
Methods such as determining the above-mentioned conditions are used.

FIG. 14 shows a conventional example of a plant monitoring device that monitors the process amount of a plant using such a method.

In the figure, various plant sensor signals are input to a sensor signal converter 2 via a process input signal 1, and each is converted into an engineering value. The data converted into engineering values by the sensor signal converter 2 is compared with each alarm judgment limit value from the alarm judgment limit value database 4 in the sensor signal processing part, an alarm judgment is made, and the result is added. It is then stored in the sensor state storage section 5. The alarm status output unit 6 retrieves the name of the sensor signal in which an alarm is occurring and is stored in the sensor status storage unit 5 from the input signal database 7, and sends the name of the sensor signal in which the alarm is occurring to the CRT display 8 and the printer 9. Outputs signal data and name as an alarm message.

Further, the display processing unit 10 creates display data according to the display screen information stored in the screen information data unit 11 based on the data stored in the sensor status storage unit 5, and displays the plant status display screen on the CRT display 8. Display.

On the other hand, the predictive alarm processing section 12 calculates the rate of change of a specific input signal among the data output from the sensor signal conversion section 2, and stores the value after a certain period of time in the alarm judgment limit value database 4. It is determined whether or not the stored limit value is exceeded, and if a warning is reached, the predictive warning output unit 13 is notified of the occurrence of a predictive warning.

The predictive alarm status output section 13 extracts the name from the input signal database 7 for the plant sensor signal notified by the predictive alarm processing section 12, and outputs the data and name to the CRT display 8 and the plant 9 as a predictive alarm message. .

(Problems to be Solved by the Invention) As mentioned above, conventional plant monitoring devices monitor the plant status in three stages: normal, predictive alarm, and alarm, which itself does not improve monitoring performance. Although this can be said to be excellent, preparing two sets of limit values for all input points requires consideration of many cases, and is difficult in reality.

On the other hand, if the inputs for making a predictive warning judgment are limited, there will be two cases, one with a predictive warning and one without a predictive warning among the monitored items, which poses a problem that it is difficult for the operator to understand.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a plant monitoring device that solves such problems and improves monitoring performance by setting one set of upper and lower limit values for each plant sensor signal.

[Structure of the Invention] (Means for Solving the Problems) The present invention compares each plant sensor signal input from sensors arranged in each part of the plant via a process input device with each preset alarm limit value. In a plant monitoring device that determines a normal state and an abnormal state and displays them on a screen display, the rate of change of the plant sensor signal is calculated, and a plant sensor signal whose rate of change exceeds a predetermined value is determined to be a change. A change detection unit detects each of the plant sensor signals in the normal state and abnormal state, and for normal plant sensor signals, a plant sensor signal with a change detected by the change detection unit is set as a caution arousing state. The present invention is characterized in that a display processing section for distinguishing and displaying three states is provided on the screen display.

(Effect) Controls the status of plant process amount ■No fluctuation in normal range...normal: No corresponding operation required■
Fluctuations in normal range... Caution required: Strengthening of monitoring ■ Limit value deviation... Alarm issued: All inputs are identified and displayed in 3 states that require action. It becomes possible to monitor the three states of normal and warning at a glance without setting a second predicted limit value for each point, and a plant monitoring device with excellent monitoring performance can be obtained.

(Embodiment) FIG. 1 shows a configuration diagram of a plant monitoring device according to an embodiment of the present invention. In the figure, the same reference numerals as in FIG. 14 indicate the same or corresponding parts, and the difference from FIG. 14 is the sensor signal processing unit 3. In place of the sensor state storage section 5, the predictive alarm processing section 12, and the predictive alarm state output section 13, an alarm processing section 14 is provided.
, an alarm state storage section 15, a sensor signal storage section 16, and an attention arousing state detection processing section 17 are provided.

The alarm processing unit 14 compares the process quantity converted into an engineering value by the sensor signal conversion unit 2 with the limit value obtained from the alarm judgment limit value database 4 configured as shown in FIG. 2, and determines the limit value. The presence/absence of deviation is determined and the result is stored in the alarm state storage section 15 having a configuration as shown in FIG.

The sensor signal storage unit 16 stores the process quantities converted into engineering values by the sensor signal conversion unit 2 in a configuration as shown in FIG.

The alarm processing section 14 includes a change detection section 171, a change state storage section 172, and an input state determination section 173.

The change detection unit 171 calculates the rate of change based on the process quantity input by the process input device 1 and converted into an engineering value by the sensor signal conversion unit 2, and if the amount of change is larger than the normal noise level. , it is assumed that there is a change, and the presence of change is stored in the change state storage unit 172 having a configuration as shown in FIG.

The input state determination section 173 sequentially inputs the stored contents of the alarm state storage section 15 and the change state storage section 172, determines the current state of each sensor signal, and determines the state and process of each sensor signal. The display processing unit 10 is notified of the amount.

The display processing section 10 inputs the state of each sensor signal and the process amount from the screen information data section 11 configured as shown in FIG. 6, and displays the screen as explained later in FIG. 11 according to the state of each sensor signal. A plant status display screen is displayed on the CR7 display 14.

The alarm status output unit 6 uses the alarm status storage unit 15 to extract the name of the sensor input that is an alarm from the input signal database 9 configured as shown in FIG. Take out the
It is output to the CRT display 8 and printer 9 as an alarm message.

Next, the operation of this embodiment configured as described above will be explained.

As shown in FIG. 8, the plant sensor signal input via the process input device 1 is converted into an engineering value by the sensor signal converter 2 (A). Based on the signal, the change detection unit 171 calculates the rate of change using the generally known least squares method. The presence/absence of a change is determined by determining whether the value exceeds the limit value for determining the presence of a change (C).

The alarm processing section 14 stores analog signal values converted into engineering values by the sensor signal conversion section 2, and limit value database 4 for alarm judgment, which is determined in advance at the design stage and configured as shown in FIG.
It is compared with the limit value for warning determination stored in the internal memory, and it is determined whether or not the limit value is deviated from the limit value (D). As a result,
If it is determined that the analog signal value S has deviated from the limit value during the period indicated by □ and τ in FIG. 9, it is determined from the alarm state storage unit 15 having the configuration as shown in FIG. Do (E). If the previous deviation was also normal, do nothing, and if the previous deviation was normal, store the current deviation state in the alarm state storage unit 1.
5 (F). At the same time, names and input values (engineering values) are retrieved from the input signal database 9 configured as shown in FIG. 4 and the sensor signal storage unit 16 configured as shown in FIG. Outputs a warning message (G).

On the other hand, as a result of comparison with the limit value, the period τ2゜τ3 in Fig. 9
, τS, τG, and τ7, it is determined from the alarm state storage unit 15 whether it was also normal last time,
If it was normal last time, do nothing. However, if the previous time was a deviation from the limit value (H), the current normal information is stored in the alarm state storage section 15 (I), and the name and input value are stored from the input signal database 7 and the sensor signal storage section 16. (engineering value).

A normality recovery message is output to the CRT display 8 and printer 9 (J).

As a result of the change presence/absence determination (K), the periods τ1 and τ in FIG.
As shown in FIG. 6, if there is a change, the change state storage unit 1 having the configuration as shown in FIG.
As a result, if there is a change in the previous time, nothing is done, and if there is no change in the previous time, the current change information is stored in the change state storage section 172 (0).

In addition, the change presence/absence determination result is the period τ2, τ6, τ in FIG.
As shown in 7, it is determined from the change state storage unit 172 whether there was no change last time (L). As a result, if there was no change last time, nothing is done; if there was a change last time, the current change information is stored in the change state storage unit 172 (M
).

The above processing is periodically performed for all analog input points, and a plant status display screen is displayed on the CR7 display 8 based on the determination results.

That is, as shown in FIG. 10, the display processing section 10 inputs screen information data as shown in FIG. 6, which is stored in the screen information data section 11 in advance at the design stage (P). Regarding the input points to be displayed indicated by this, the alarm state storage unit 15 in which the determined results are stored in the comparison determination process with the limit value is checked (
Q)' As a result, if there is an input point that is generating an alarm, blink the numerical display section A shown in the display example in Figure 11 at high speed with red brightness inversion to indicate that an alarm is occurring. Create display data that prompts plant operators (R
) Also, if the judgment result is normal, check the change state storage unit 172 in which the result judged by the change detection unit 171 is stored; if there is no change, check the table in FIG. Create display data that does not cause the numerical display part shown in the example to blink using green luminance inversion heat and does not burden plant operators with monitoring (T).

If the contents of the change state storage section 172 have changed, the numerical display section A shown in the display example of FIG. 11 is blinked at a low speed with yellow luminance inversion to call the plant operator's attention. Create display data such as (υ), and when there is no change, change the display to a non-blinking display (normal change heat) using green brightness inversion heat.

A plant status display screen is displayed on the CR7 display 8 based on the display data for each determination result as described above (V).

These determination processes are performed at regular intervals, and the latest values of analog inputs that change moment by moment are displayed.

As mentioned above, in the conventional technology, when a predictive warning or an alarm occurs, the display of numerical values, par charts, markers, etc. on the plant status display screen of the CRT display is changed to encourage stronger monitoring. , all input points were not monitored because a dedicated limit value had to be set for each.

On the other hand, according to this embodiment, instead of a predictive warning, if there is a change in the sensor input even during normal conditions, it is displayed on the plant status display screen. All input points can be closely monitored without setting special limit values for the input points.

In this way, by encouraging stronger monitoring of changes in plant conditions from the normal range, countermeasures can be taken earlier and before abnormalities occur than with conventional predictive warnings, which greatly contributes to safe plant operation.

In addition, in the above embodiment, since the change presence/absence judgment is determined by calculating the change rate using the least squares method based on the past several data, in the case of a case where the change gradually changes over a long period of time, the above judgment With this method, there may be no change and the change may be overlooked.

In consideration of such a case, as shown in FIG.

Based on a certain point in time specified by the plant operator, the upper limit U'' and lower limit L' for determining the presence of a change are fixed and set to the same width as the upper limit U and the lower limit for determining the presence of a change based on the above judgment. By adding a function that determines that there is a change when the analog signal value S reaches the limit values U and L, it is possible to monitor not only sudden changes but also gradual changes.

Further, as for the display method, in the above embodiment, a display method is used to call the attention of the plant operator, such as inverting the brightness in yellow and blinking to indicate that there is a change, but there is no display of the direction of change.

In order to display this, based on the rate of change calculation results,
Determine which direction the bottom is changing in, and use the result as the first
3 Upward arrow B or downward arrow (
By displaying (not shown), changes can be displayed more easily.

[Effect of the invention] As explained above, according to the present invention, the second
It is possible to closely monitor the three states of normal, caution, and alarm without setting predicted limit values for all processes.

Additionally, in general, the process amount fluctuates when some kind of disturbance (occurrence of an operation) occurs.According to the present invention, in the sense of proactively strengthening monitoring, instead of the conventional predictive alarm, the alarm limit It becomes possible to detect not only the approaches to the values, but also any fluctuations within the normal range, making it possible to not only strengthen monitoring but also further improve the safety of plant operation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a plant monitoring device showing an embodiment of the present invention, FIG. 2 is a block diagram of the limit value database for alarm judgment shown in FIG. 1, and FIG. 3 is a block diagram of the alarm state storage unit shown in FIG. , FIG. 4 is a configuration diagram of the sensor signal storage section in FIG. 1, FIG. 5 is a configuration diagram of the change state storage section in FIG. 1, and FIG. 6 is a configuration diagram of the screen information data section in FIG. 1. 7 is a configuration diagram of the input signal database in FIG. 1, FIG. 8 is a flowchart of the plant data input and change presence/absence determination process in FIG. 1, and FIG. 9 is a determination diagram of the display state in FIG. 1. FIG. 10 is a flowchart of the display data processing shown in FIG. 1, FIG. 11 is a diagram showing an example of what is displayed on the CRT display of FIG. 1, and FIG. 12 is a diagram showing another embodiment of the present invention in a plant monitoring device. Diagram for determining whether there is a change from the starting point,
FIG. 13 is a diagram showing another example of a change direction display screen displayed on the CRT display of FIG. 1, and FIG. 14 is a configuration diagram of a conventional plant monitoring device. DESCRIPTION OF SYMBOLS 1... Process input device, 2... Sensor signal converter, 4... Limit value database for alarm judgment, 6... Alarm status output unit, 7... Input signal database, 8...
- C display, 9... Printer, 10... Display processing section, 11... Screen information data section, 15... Alarm state storage section, 16... Sensor signal storage section, 17... - Attention arousal state detection processing section, 171... Change detection section, 172... Change state storage section, 173... Input state determination section. (7317)

Claims (1)

[Scope of Claims] Each plant sensor signal input from sensors arranged in each part of the plant via a process input device is compared with each preset alarm limit value, and a normal state and an abnormal state are determined. In a plant monitoring device that displays identification on a screen display, a change detection unit calculates a rate of change of the plant sensor signal and detects a plant sensor signal whose rate of change exceeds a predetermined value as a change, and each of the plant sensor signals In addition to the above-mentioned normal state and abnormal state, the above three states are identified on the screen display as a normal plant sensor signal and a plant sensor signal with a change detected by the change detection section as a warning state. 1. A plant monitoring device comprising a display processing section for displaying information.