JPH0756961A - Process monitoring device - Google Patents

Abstract

PURPOSE:To monitor the abnormal operation of plural objects to be monitored extending over a wide area by displaying time series change data in a graph white switching the readout of each time series change data from the stored time series change data of the plural objects to be monitored. CONSTITUTION:This device is equipped with a display means 5 which graph- displays the time series change of the object to be monitored on a screen, a collection means 1 which collects the time series change date of the plural objects to be monitored at every time sequentially, a data storage means 2 which stores the time series change data in order of collection, a monitor object specifying means 3 which specifies the time series change data graph-displayed on the display screen of the display means 5 from the time series change data of the plural objects to be monitored, a data readout means 4 which reads out the time series change data of a specified object to be monitored from the data storage means 2 and displays it on the display screen as a time series change graph.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process monitor device for displaying the operating state of a plant such as a water and sewage plant as a trend graph on a screen for monitoring.

[0002]

2. Description of the Related Art FIG. 10 is a block diagram of an integrated instrumentation system shown in "Mitsubishi Electric Instrumentation Control System MACTUS500 Series Process Monitor Function Manual, March 1991, issued by Mitsubishi Electric". In the figure, 100 is a multi-controller, and this multi-controller 1
00 is a digital input signal, an analog input signal, and a pulse input signal input from a plant (not shown) as a measurement signal or a control signal of a control device (not shown), and outputs the processing result as state data and display data of the plant. Also, the control setting data and the equipment setting data for the plant are appropriately converted into digital, analog and pulse output signals.

Reference numeral 120 denotes a process monitor device, which processes the status data and display data input from the multi-controller 100 via the bus 110, processes them into graphic display messages, and outputs them to the display unit 150 or the disk device 140. , For warning message and output to printer 160. The control setting data and the device operation data input from the keyboard 130 are output to the multi-controller 100.

FIG. 11 is a diagram showing a display screen of the display unit 150 shown in FIG. The display screen is a historical trend display area 50 for recording past time series changes of process signals and displaying them in a graph, a real-time trend display area 51 for displaying how the values of process signals are currently changing, and a graph. It has a related information display area 52 for displaying graph display item related information such as comments of display items, tags, and current values, and a menu display section 53 displaying various menus for operating the display section 150.

FIG. 12 is a diagram showing an array of trend data for each monitor target stored in a memory (not shown) built in the process monitor device 120. In this memory, trend data is sequentially collected from the three monitoring targets A, B and C at a cycle of 5 seconds and stored at each address.

Next, a method of making the trend data stored in the memory into time-series change data in a graph display format and scrolling the historical trend display area 50 and the real-time trend display area 51 on the display screen in the time axis direction will be described. . There are two types of scroll operation methods, a manual scroll mode and an automatic scroll mode.

First, the manual scroll mode will be described. To implement the manual scroll mode, the manual scroll mode is selected from the operation menu 53 as shown in FIG. Next, with the cursor movement key 53P, the past time-series change data displayed in the historical trend display area 50 and the real trend display area 51 is made into a historical trend graph, and scrolled along the time axis. In addition, the process monitor device 120 includes the display unit 1.
It supports a large screen that is 50 times the size of 50. By scrolling the historical trend graph in the past direction, that is, to the right of the screen, a time series with a time width that is greater than or equal to the time width determined by the horizontal length of the display screen. Change data can be moved and displayed as a historical trend graph.

When the cursor movement key 53F is pressed, the historical trend graph currently displayed in the historical trend display area 50 is scrolled in the left direction of the screen and is erased from the screen in order from the oldest time series data.
The latest time series change data collected in the real time trend display area 51 by that amount is subsequently displayed as a real time trend graph.

Next, scroll display of the display graph in the automatic scroll mode will be described with reference to FIG. First, the automatic scroll mode is selected on the operation menu 53. As a result, when the real-time trend display area 51 is filled with the time-series change data, the real-time trend graph is automatically scrolled to the historical trend display area 50. As a result, the historical trend graph displayed in the historical trend display area is automatically scrolled to the left end of the display area 50 by the time the real-time trend graph is scrolled, and the historical trend graph is deleted from older data.

The above scrolling is repeated three times, and when half the display time width has elapsed, the trend display is once erased. Then, the trend display designation time is again displayed based on the time obtained by adding 1/2 of the display time width.

In addition, when the collected process signals are displayed as a trend graph on the screen,
Set the collection period of the process signal and the display time width of the trend graph generated based on the process signal. However, depending on the settings of the collection cycle and the display time width, it is not possible to display the trend graphs showing the time series changes of all the monitored targets, and for example, the data a _{1 to} a ₃ and the data b ₁ to
b _3, the data c ₁ to c ₃ monitor including the target A, B, and only one of the monitor the trend graph of the target when it is C is displayed.

To explain the above in more detail using numerical values, for example, if the display time width is 2 hours and the collection cycle is 5 seconds, the number of data in the display time width can be obtained by the following formula.

Number of data = 2 hours × 60 minutes × 60 seconds × (0.2 seconds) = 1440 data

On the other hand, the number of pixels that can be displayed in the historical trend display area 50 and the real-time trend display area 51 of the process monitor device is fixed, for example, 4 pixels.
Assuming 80 dots, 480 dots / 1440 data =
1 dot / 3 data, 1/3 of the collected data
Only is displayed as a trend graph. If there are three data to be monitored stored in the memory shown in FIG. 12, for example, only the data of the monitor A is displayed as a trend graph. Therefore, when a plurality of data to be monitored are simultaneously displayed as a graph, the display time width must be narrowed.

[0015]

Since the conventional process monitor device is constructed as described above, the following points are not taken into consideration, and effective monitoring information cannot be provided to the monitoring staff. There was a problem that it did not exist.

(1) The conventional process monitor device can display only a trend graph of a plurality of monitored data, for example, a single monitored data depending on the setting of the data collection period and the display time width. Even if the trend trend of the entire plant could be grasped from the trend graph, it could not be detected even if sudden changes occurred in other monitored targets. Moreover, if the display time width is narrowed to eliminate such a problem, it is inevitable to display a plurality of single time width trend graphs, which makes it difficult to see the plant operation for a long time.

(2) Since only the trend graph is displayed on the display section of the process monitor device, when trying to numerically analyze the state of the plant, the numerical data of the plant must be obtained by another method and manually analyzed. It took time and labor for the analysis. (3) Even if an abnormality occurred in the plant and the abnormal state was implemented in the trend graph through the collected data, the abnormal state could not be easily detected by the trend graph except for the supervisor who was familiar with the operation of the plant. (4) Only the historical trend graph and the real-time trend graph in which the past time-series change data and the current time-series change data are graphed are displayed on the display part of the process monitor device. It was not possible to grasp future driving trends.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a process monitor device that effectively informs an observer of the operating state of the plant and future operating trends.

[0019]

According to a first aspect of the present invention, there is provided a process monitor device, wherein display means for displaying a time-series change of a monitoring target on a screen as a graph and time-series change data of a number of monitoring targets at each time. Data collection means for sequentially collecting data, data storage means for storing the time-series change data in the order of collection, and time-series change data to be graphically displayed on the screen of the display means from the plurality of monitored time-series change data. The monitoring target specifying means and the data reading means for reading the specified time-series change data of the monitoring target from the data storage means and displaying it on the screen of the display means as a time-series change graph.

In the process monitor apparatus according to the invention of claim 2, the display means for displaying the time-series change of the monitoring target on the screen as a graph and the position of the cursor for determining the extraction period of the time-series change data are displayed on the screen of the display means. Extraction period setting means for setting the time-series change graph displayed in, the data extraction means for extracting the time-series change data within the extraction period set by the extraction period setting means in Casole, and the extracted time-series change Data conversion means for converting data into numerical data and display execution means for displaying the converted numerical data on the screen of the display means are provided.

In the process monitor apparatus according to the third aspect of the present invention, the display means for displaying the time-series change of the monitoring target on the screen as a graph, and the time-series change data displayed on the screen of this display means as a graph in real time. A data extracting means for sequentially extracting the time series change data, a limit value setting means for setting a limit value that defines an upper limit and a lower limit of a change allowable value of the time series change data, and the time series change data sequentially extracted by the data extracting means. Of the time series change data is compared with the limit value set by the limit value setting means to determine whether or not the value of the time-series change data exceeds the limit value, and when displayed according to the determination result. Display changing means for changing the graph display form of the series change data.

According to a fourth aspect of the present invention, there is provided a process monitor device for displaying a time-series change of a monitoring target on a screen as a graph, and scheduled monitoring data for each time when the time change of the monitoring target is scheduled. Monitoring data generation means, data conversion means for converting scheduled monitoring data generated by this monitoring data generation means into a time series change graph, time series change graph converted by this data conversion means, and monitoring along real time Graph display execution means for displaying the target time-series change graph on the screen of the display means in a simultaneous series.

[0023]

In the process monitor apparatus according to the present invention, a plurality of time-series change data of the plurality of monitoring targets stored in the data storage means are displayed while switching the reading of each time-series change data to display a plurality of graphs. It is possible to monitor the abnormal operation of the monitoring target of the above in a wide area.

In the process monitor device according to the invention of claim 2, a time period for monitoring the time-series change data to be monitored by numerical data is set for a certain period, and the time-series change data extracted within the set period is set. Is converted into numerical data and displayed on the screen, the monitoring staff can easily obtain data for numerically analyzing the operation of the monitoring target.

In the process monitor apparatus according to the third aspect of the present invention, after the upper limit value and the lower limit value which allow the change of the time-series change data are preset, the time-series change data of the monitoring target that changes along the real time is the upper limit. When the value or the lower limit value is exceeded, the graph display form of the time-series change data at the time when the value is deviated is changed to urge an observer to generate an abnormal operation of the monitoring target.

In the process monitor apparatus according to the invention of claim 4, the scheduled time-series change data of the monitoring target and the graph based on the time-series change data of the monitoring target sequentially input in real time are simultaneously displayed. The abnormal operation of the monitoring target is detected at an early stage by displaying an image on the series and visually observing whether the time-series change graph showing the current movement trend of the monitoring target matches the change of the scheduled time-series change graph.

[0027]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a functional configuration of a process monitor device according to this embodiment. The overall system configuration is the same as in FIG. 10 used in the conventional technique. The gist of the present embodiment is that all the stored time-series change data of each monitored object are appropriately displayed as historical trend data. In FIG. 1 (a), 1 is a data collecting means for sequentially collecting time-series change data of a plurality of monitoring targets from a multi-controller (FIG. 10) at each time, and 2 is the time-series change data in the order of collection. Data storage means for storing, 3 is a monitoring target specifying means for specifying time series change data to be graphically displayed on the screen of a display means described later from time series change data for a plurality of monitoring targets, and 4 is a time series for the specified monitor targets. Change data is stored in the data storage means 2
Further, data reading means 5 for displaying the time series change graph on the read screen is a display means for displaying the time series change graph on the screen.

FIG. 1B shows an array of historical trend data stored in the data storage means 2. The process monitor device collects the time-series change data of each monitor target in a cycle of, for example, 5 seconds, so that each data a ₁ to
.. are stored in three addresses, namely addresses 1, _{4, 7,} 10 ,. The data b _{1 to} b ₄ ... Of the monitor target B are assigned to the addresses 2, 5, 8, 11 ... And the data c _{1 to} c ₄ ... It is stored at each address of 6, 9, 12 ... Therefore, by reading the data a _{1 to} a ₄ ... From each address and displaying the graph, a historical trend graph showing the time-series change of the monitor target A as shown in FIG. 2 is obtained.

FIG. 2 shows an example of the display screen of the display means 5. In the figure, the same reference numerals as those in FIG. 11 indicate the same or corresponding parts. In this embodiment, a low speed cursor movement key 53S is provided in addition to the cursor movement key 53P and the cursor movement key 53F as the cursor movement keys of the operation menu 53A. By adding the low speed cursor movement key 53S, for example, when the historical trend graph of the monitor target A is displayed on the display screen, when switching the display of this historical trend graph to the historical trend graph of the monitor target B, the low speed cursor is displayed. When the movement key 53S is pressed together with the movement key 53S, or when the display is switched to the historical trend graph of the monitor target C, the low speed Cassole movement key 53S and the Cassole movement key 53F are pressed.

By the combination of the keys pressed in this way, a specific signal for specifying the historical trend graph displayed in the graph is output from the monitoring target specifying means 3 to the data reading means 4. As a result, the data reading means 4 reads the data necessary for the graph display from the data storage means 2.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. For example, the data reading means 4
Inputs the specific signal K from the monitoring target specifying means 3 (step S1). Then, it is checked whether the specific signal K is 1, 2, or 3 (step S2). At this time, K =
If it is 1, the historical trend graph to be displayed in the graph relates to the monitor target A, if K = 2, it relates to the monitor target B, and if K = 3, it relates to the monitor target C.

If it is determined in step S2 that K = 1, the head address M to be accessed in the data storage means 2 is set to 1 (step S3), and then the data read number n is set to 0 for initialization. (Step S
6). Hereinafter, in order to sequentially calculate the addresses in which the respective data a _{1 to} a ₄ are stored, P is set to 1 by first substituting 1 and 0 into M and 3n, respectively (step S7). And
The address AD is replaced with P (= 1) and output to the data storage means 2 (step S8). As a result, first, the data a ₁ is read from the address 1.

Next, in order to read the data a ₂ from the address 4, first P is initialized to 0 (step S
9), and n (= 0) +1 is calculated to change n to 1 (step S10). Then, in step S11, n> 4
If n> 4 is not satisfied, the process proceeds to step S7. Since n = 1 in step S7, P becomes 4 and the address AD is replaced with 4 and output to the data storage means 2 (step S8). Then, the data a ₂ is read from the address 4. The above operation is repeated until n> 4 in step S11. As a result, the address 1,
Data a ₁ , a ₂ , a ₃ , a ₄ from each of 4, 7, 10
Are read out.

When reading the data relating to the monitored object B, the head address M is set to 2 in step S7, and then steps S7 to S11 are repeated to obtain the data b ₁ from the addresses 2, 5, 8 and 11, respectively. b ₂ ,
Each of b ₃ and b ₄ is read. Alternatively, when reading the data on the monitoring target C, the head address M is set to 3 in step S7, and then steps S7 to S are performed.
By repeating step 11, data c ₁ , c ₂ , c ₃ and c ₄ are read from the addresses 3, 6, 9 and 12, respectively.

The above description has been made in the case where the number of monitored objects is 3 and the number of data for each monitored object is 4, but when the number of monitored objects and the number of data are increased, the value of M is increased in accordance with the increase and step S7, The constant in S11 (3,
Change 4). Therefore, according to this method, the stored time-series change (trend) data can be appropriately displayed as a historical trend graph without omission, so that even if there is a sudden change in the plant state, it will not be overlooked.

Example 2. In the first embodiment described above, the stored trend data is displayed on the display screen as a historical trend graph to notify the observant of the time series change of the plant. However, in the present embodiment, the time analysis is performed to facilitate the numerical analysis of the plant state. Data is appropriately extracted from the display data or the state data as the series change data and displayed numerically.

Next, this embodiment will be described with reference to the drawings. FIG. 4 is a block diagram showing the configuration of the process monitor device in this embodiment. In the figure, 6 is an extraction period setting means for setting the position of Casole that determines the extraction period of time series change data between predetermined times in the time series change graph displayed on the screen of the display means 5, and 7 is extraction period setting means 6 The data extracting means for extracting the time-series change data within the extraction period set in Kasor, 8 is the data converting means for converting the extracted time-series change data into numerical data, and 9 is the display screen for the converted numerical data. It is a display execution means for displaying on.

Next, the operation of this embodiment will be described.
First, as shown in the display screen of FIG. 5, the extraction period setting means 6 moves the cursor lines K1 and K2 to the positions of two designated times displayed on the historical trend graph and displayed on the historical trend graph. The period sandwiched between these two cursor lines K1 and K2 is the period for extracting the monitoring data required for numerical analysis. Here, what is extracted as the monitoring data is the maximum value and the minimum value in the case of an analog process signal, the plant operation time, the stop time and the number of times of operation in the case of the start / stop signal, and the failure signal. For example, the number of failures.

When the extraction period of the monitoring data is set, the data extracting means 7 extracts the monitoring data such as the start / stop signal within the extraction period from the input time series change data. The extracted monitoring data is sent to the data converting means 8 and the operating time, the stop time and the number of times of operation are converted into numerical data. The converted numerical data is displayed by the display executing means 9.
Is displayed numerically in the related information display area 52 displaying the graph display item related information on the display screen. As a result, the supervisor can easily perform the numerical analysis of the plant by using the displayed numerical data.

Example 3. In this embodiment, the monitoring data is sequentially extracted from the real-time trend data that is time-series change data along the real time, and when an abnormality is detected in the monitoring data, the graph display form of the abnormality detection part in the real-time trend graph is changed. Inform the observer of the abnormality.

Next, this embodiment will be described with reference to the drawings. FIG. 6 is a block diagram showing the configuration of the process monitor device in this embodiment. In the figure, 7A is a data extraction means for sequentially extracting the time-series change data that is graphically displayed on the display screen of the display means 5 along the real time, and 10 is an upper limit and a lower limit of a change allowable value of the time-series change data. A limit value setting means for setting the limit value, and 11 a data extracting means 7A
Comparing means for comparing the value of the time-series change data sequentially extracted with the limit value set by the limit value setting means 10 to determine whether the value of the time-series change data exceeds the limit value, 12 Is a display changing means for changing the graph display form of the time-series change data displayed according to the determination result.

The operation of this embodiment will be described below.
The limit value setting means 10 sets, for example, limit values of an upper limit value and a lower limit value at which a change in water pressure is allowed. On the other hand, the data extracting means 7A changes along the real time and sequentially extracts the water pressure data which is the monitoring data from the real time trend data in which the state of the change is displayed in a graph. The value of the extracted monitoring data is output to the comparison means 11 and compared there with the limit value set by the limit value setting means 10.

When the water pressure at the predetermined time is out of the limit value, it is determined that there is an abnormality in the water pressure, and as shown in FIG. 7, the graph showing the water pressure value at the time of the abnormality is displayed in a broken line from the solid line. Change the graph display format. As a result, the plant abnormality can be immediately detected from the graph display. The change of the display form of the graph is not limited to the above, and the display of the abnormal portion in which the display color of the abnormal portion is changed may be blinked. As described above, in this embodiment, even if the monitoring data for a certain period is extracted from the historical trend data which is the past time series change data and subjected to the numerical analysis of the plant state, therefore, some abnormality is detected from the analysis result. But it's not too late.

Example 4. The present embodiment, when the plant is operated according to a predetermined operation schedule,
By displaying the planned time change of the plant on the display screen in advance and displaying this graph and the time-series change graph of the monitored object along with the real time on the display screen at the same time, the plant operates as planned. This makes it easy to determine whether or not

The present embodiment will be described below with reference to the drawings. FIG. 8 is a block diagram showing the configuration of the process monitor device in this embodiment. In the figure, 13 is a monitoring data generating means for generating scheduled monitoring data for each time when the time change of the monitoring target is scheduled, and 14 is conversion of the scheduled monitoring data generated by the monitoring data generating means 13 into a time series change graph. Data conversion means 15 is a graph display execution means for displaying the time-series change graph converted by the data conversion means 14 and the time-series change graph to be monitored along with the real time on the screen of the display means 5 simultaneously.

Next, the operation of this embodiment will be described.
First, the operation data generation means 13 creates operation schedule data of a monitor target that is operated according to a predetermined schedule. This operation schedule data is converted by the data conversion means 14 into a time change graph that changes with each scheduled time. That is, this time change graph is a time series graph showing how the monitoring target in the plant changes at the scheduled time.

Next, the graph display executing means 15 displays the time change graph created by the data converting means 14 along the respective scheduled times displayed below the display areas 50 and 51 as shown in FIG. Are sequentially displayed on the display screen of. At this time, the graph display executing means 15 converts the time series change data input along the real time into a real time trend graph, and the time change graph is displayed on the same time series. Therefore, the observer can easily determine whether or not the plant is operating as scheduled by visually checking whether the real-time trend graph is following the same trend as the time change graph on the display screen.

[0048]

According to the process monitor apparatus of the present invention, the display means for displaying the time-series change of the monitoring target on the screen, and the data collection for sequentially collecting the time-series change data of the plurality of monitoring targets at each time. Means, data storage means for storing the time-series change data in the order of collection, and monitoring target specifying means for specifying the time-series change data to be displayed in a graph on the screen of the display means from the plurality of monitoring target time-series change data. A plurality of data reading means for reading the specified time-series change data of the monitoring target from the data storage means and displaying the data on the screen of the display means as a time-series change graph, regardless of the length of the display time width. Since it is possible to switch and display the time-series change data of the monitoring target, it is possible to easily grasp even if the operation of the other monitoring target suddenly changes.

According to the second aspect of the present invention, there is provided the process monitor device, wherein the display means for displaying the time-series change of the monitoring target on the screen and the position of the cursor for determining the extraction period of the time-series change data between the predetermined times are displayed by the display means. Extraction period setting means to set the time series change graph displayed on the screen of
Data extraction means for extracting the time-series change data within the extraction period set in Casole by the extraction period setting means, data conversion means for converting the extracted time-series change data into numerical data, and the converted numerical data Is provided on the display screen, the time-series change data displayed as a graph can be converted into numerical data and displayed on the screen, which has the effect of facilitating numerical analysis of the operation of the monitored object. .

According to the third aspect of the present invention, there is provided the process monitor device, which sequentially displays the display means for displaying the time-series change of the monitoring target on the screen, and the time-series change data which is graphically displayed on the screen of the display means in real time. Data extracting means for extracting, limit value setting means for setting a limit value defining an upper limit and a lower limit of the allowable value of the change of the time series change data, and a value of the time series change data sequentially extracted by the data extracting means And a limit value set by the limit value setting means, comparing means for determining whether or not the value of the time series change data exceeds the limit value, and the time series change displayed according to the determination result. Since the display change means for changing the graph display form of the data is provided, it is displayed in the graph of the time-series change data that the time-series change data deviates from the allowable change value. There is an effect that it is possible to easily convey the warden.

In the process monitor apparatus according to the present invention, the display means for displaying the time series change of the monitoring target on the screen, and the monitoring data generation for generating the scheduled monitoring data for each time when the time change of the monitoring target is scheduled. Means, a data conversion means for converting the scheduled monitoring data generated by this monitoring data generation means into a time series change graph, a time series change graph converted by this data conversion means, and the time of monitoring target along the real time Since the sequence change graph is simultaneously displayed on the screen of the display unit at the same time, it is possible to easily determine whether or not the monitoring target is performing the scheduled movement, and at the same time, perform the scheduled operation. Since the deviation from can be inferred, it is possible to prevent an abnormal situation from occurring.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a process monitor apparatus according to the invention of claim 1.

FIG. 2 is a diagram showing a trend graph displayed on the screen of the display means according to the present embodiment.

FIG. 3 is a flowchart illustrating the operation of this embodiment.

FIG. 4 is a block diagram showing a configuration of an embodiment of a process monitor device according to the invention of claim 2;

FIG. 5 is a diagram showing a trend graph displayed on the screen of the display means according to the present embodiment.

FIG. 6 is a block diagram showing a configuration of an embodiment of a process monitor device according to the invention of claim 3;

FIG. 7 is a diagram showing a trend graph displayed on the screen of the display means according to the present embodiment.

FIG. 8 is a block diagram showing a configuration of an embodiment of a process monitor device according to the invention of claim 4;

FIG. 9 is a diagram showing a trend graph displayed on the screen of the display means according to the present embodiment.

FIG. 10 is a configuration diagram showing a plant system including a conventional process monitor device.

FIG. 11 is a diagram showing a trend graph displayed on a display unit of a conventional process monitor device.

FIG. 12 is a diagram showing a data array of a memory that stores time-series change data.

FIG. 13 is a diagram illustrating a manual scroll operation of a conventional process monitor device.

FIG. 14 is a diagram illustrating an automatic scrolling operation of a conventional process monitor device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 data collection means 2 data storage means 3 monitoring target specifying means 4 data reading means 6 extraction period setting means 5 display means 7, 7A data extraction means 8 data conversion means 9 display execution means 10 limit value setting means 11 comparison means 12 display change Means 13 Operation data generation means 14 Data conversion means 15 Graph display execution means

Claims (4)

[Claims] 1. A display unit for displaying a time-series change of a monitoring target on a screen as a graph, a data collecting unit for sequentially collecting time-series change data of a plurality of monitoring targets at each time, and the time-series change in the order of collection. Data storage means for storing data, monitoring target specifying means for specifying time series change data to be displayed in a graph on the screen of the display unit from the plurality of monitoring target time series change data, and time series of the specified monitoring targets A process monitor device comprising: data read means for reading change data from the data storage means and displaying it on the screen of the display means as a time series change graph. 2. A display means for displaying a time-series change of a monitoring target on a screen as a graph, and a position of Casole which determines an extraction period of the time-series change data in a time-series change graph displayed on the screen of the display means. Extraction period setting means for setting, data extraction means for extracting time-series change data within the extraction period set in Casole by the extraction period setting means, and data conversion for converting the extracted time-series change data into numerical data A process monitor device comprising: means and display execution means for displaying the converted numerical data on the screen of the display means. 3. A display unit for displaying a time-series change of a monitoring target on a screen as a graph, and a data extracting unit for sequentially extracting time-series change data displayed as a graph on the screen of the display unit in real time. Limit value setting means for setting a limit value that defines the upper limit and the lower limit of the allowable value of change of the time series change data, the value of the time series change data sequentially extracted by the data extracting means, and the limit value setting means Comparing with the set limit value, comparing means for determining whether the value of the time-series change data exceeds the limit value, and a graph display form of the time-series change data displayed according to the determination result. A process monitor device comprising: a display changing means for changing. 4. A display unit for displaying a time-series change of a monitoring target on a screen as a graph, a monitoring data generating unit for generating scheduled monitoring data for each time when the time change of the monitoring target is scheduled, and the monitoring data. A data conversion means for converting the scheduled monitoring data generated by the generation means into a time-series change graph, and a time-series change graph converted by this data conversion means and a time-series change graph of the monitoring target along with the real time, simultaneously. And a graph display executing means for displaying on the screen of the display means.