JP7668758B2 - Surveillance system and method - Google Patents

Description

The present invention relates to a monitoring system and a monitoring method.

A plant monitoring system provides the operator of the monitoring system with monitoring data, including the operating status (such as the operation or shutdown) of equipment used in the plant (e.g., pumps), as well as detection signals for water levels, flow rates, etc. The operator of the monitoring system controls and manages the equipment based on this monitoring data, so the monitoring system is required to provide the operator with trend data for the monitoring data without interruption.

In response to such demands, recent monitoring systems have been developed that use technology that allows trend data to be restored based on temporarily stored data even if a temporary collection error occurs in the trend data (see, for example, Patent Document 1).

JP 2005-18152 A

However, in the above-mentioned conventional technology, in a monitoring system that uses multiple servers for switching to increase server utilization, if a loss occurs in trend data for monitoring data when a server device in standby operation is switched to online operation, the operator cannot refer to the missing data until the process of compensating for the missing data is complete. For this reason, if there is a loss in trend data for monitoring data, the operator may not be able to properly control the plant equipment, etc.

The present invention was made in consideration of the above, and aims to enable operators to always refer to trend data for monitoring data without any loss.

In order to solve the above problem, in one aspect of the present invention, a monitoring system for monitoring an object includes two servers constituting a primary system and a secondary system, and a display processing unit. Each of the servers includes a data processing unit that calculates monitoring data for the object based on data acquired from the object, a temporary data storage unit that stores the data or the monitoring data as temporary data, a monitoring data storage unit that stores the monitoring data, and a synchronization processing unit that performs a synchronization process for the monitoring data stored in each of the monitoring data storage units with the other server. The display processing unit displays information on a display device based on read data read from the monitoring data storage unit or the temporary data storage unit, and switches the read destination of the read data based on the result of comparing the difference time between the synchronization time when the monitoring data was last synchronized by the synchronization process before the primary system and secondary system of the two servers were switched, and the storage time when the monitoring data was first stored in the monitoring data storage unit after the primary system and secondary system of the two servers were switched, with the storage period in which the monitoring data is stored in the monitoring data storage unit.

According to the present invention, for example, an operator can always refer to trend data for monitoring data without any loss.

1 is a diagram illustrating an example of the configuration of a monitoring system according to a first embodiment of the present invention. FIG. 2 is a diagram showing an example of a configuration of monitoring data according to the first embodiment of the present invention. FIG. 11 is a flowchart of a synchronization process between servers after the monitoring system is started up in the first embodiment of the present invention. FIG. 11 is a flowchart showing a complementation process using temporary data according to the first embodiment of the present invention. FIG. 11 is a flowchart showing a display process of monitoring data according to the second embodiment of the present invention. FIG. 11 is a diagram showing an example of a display screen of a display device based on monitoring data with missing data in the second embodiment of the present invention. FIG. 11 is a diagram showing an example of a display screen of a display device in which missing monitoring data is complemented on the display in the second embodiment of the present invention. FIG. 11 is a diagram illustrating an example of the configuration of a monitoring system according to a third embodiment of the present invention. FIG. 2 is a hardware diagram showing an example of the configuration of a computer that realizes a server and a client terminal.

The present invention will now be described in detail with reference to specific examples. In the drawings used in the following description, the same symbols (numbers) are used for the common devices and processing operations, and descriptions of devices and operations (processing) that have already been described may be omitted.

In addition, in the following explanation, in order to distinguish between raw data, such as detection data detected by various sensors on the plant side, and processed data to be displayed on a display device for monitoring, raw data will generally be referred to as "data," and data stored (saved) in a database or file for monitoring and control will be referred to as "monitoring data."

Monitoring data is obtained by processing detection data from various sensors installed in the plant, and is obtained by calculating and processing the data (raw data) obtained from the plant into data suitable for monitoring. For example, monitoring data can be historical data such as alarm history and reports stored in a database, or bit data for displaying trends in detection data such as water levels and flow rates stored in files.

In the following explanation, the server device that performs online operations such as processing monitoring data for plant monitoring, storing the processed monitoring data as a database or file, displaying the data for monitoring, and controlling the plant is referred to as the "master" (or "master system"), and the server device that performs standby operations to eliminate system interruptions due to failures of the master device, etc. is referred to as the "slave" (or "slave system").

(Overall system description)
First, the overall system S in the first embodiment of the present invention will be described with reference to FIG. 1. The overall system S includes server devices 1 and 2. The server devices 1 and 2 are in a relationship of an active system and a standby system, so that when one server device is in online operation (operating as a master), the other server device performs standby operation (operating as a slave). When one server device performing online operation reaches an abnormal state, the other server device in standby operation takes over the operation as a master from the server device that is determined to be abnormal and transitions to a process of performing online operations such as monitoring and control operations. In other words, the other server device switches from a slave to a master. A general-purpose computer can be used for the server devices 1 and 2.

(Internal configuration and function of the server device)
Next, a description will be given of the internal configuration of the servers 1 and 2 and the functions of each of the components. The servers 1 and 2 have the same configuration. Therefore, the configuration of the server 1 will be described here.

In FIG. 1, the data processing unit 12 of the server device 1 imports data input via the interface unit 30 from a plant 40, which is an example of a system to be monitored and controlled, by the communication unit 11. The data processing unit 12 performs calculations on monitoring data for monitoring and controlling the plant 40 based on the imported data, and stores the data in the database 13 and file 14. For example, the database 13 stores historical data such as alarm history and reports as monitoring data. The file 14 stores bit data for displaying trends of detection data such as water level and flow rate as monitoring data. The database 13 and file 14 are stored in the "storage unit".

The data processing unit 12 also stores (stores) the imported data or the monitoring data that has been calculated based on that data as "temporary data" in the temporary data storage unit 16. This temporary data is held in the server device operating as a slave for the period until it switches to the operation of the master (until the transition is complete), and is used to supplement the data when the switchover occurs.

The input and display processing unit 15 has the function of extracting the necessary monitoring data from the monitoring data stored in the database 13 and the file 14 using display software, and displaying the monitoring data on the display device 20. The operator can refer to the contents displayed on the display device 20 and monitor the plant 40.

The operator operates the input device 21 to select the type of monitoring data to be displayed on the display device 20. For example, a keyboard can be used as the input device 21. The display device 20 and the input device 21 may be a touch panel display device that integrates the display function of the display device 20 with the operation content input function of the input device 21. Note that while FIG. 1 shows an example in which the display device 20 and the input device 21 are provided in each of the server devices 1 and 2, a configuration in which a single set of the display device 20 and the input device 21 are provided and connected to each of the server devices 1 and 2 may also be used.

The communication unit 17 is provided so that the server device 1 equipped with this communication unit 17 can send and receive information, data, etc. to and from other server devices 2. The exchange of data and information (including various commands) between the master and slave machines, which will be described later, is performed via the communication unit 17 possessed by each server device.

The control unit 18 performs automatic control of the plant 40 that is the object of monitoring. For example, when the amount of water flowing through the pipelines in a water supply plant 40 is controlled by a pump or the like, when a target water volume setting value is given to the control unit 18 via the input device 21, the control unit 18 controls the pump or the like in the plant 40 so as to eliminate the difference between this water volume setting value and the input data (water volume detection signal from the sensor).

The synchronization processing unit 19 cooperates with the synchronization processing unit 19 of the other server device (server device 2 for server device 1, or server device 1 for server device 2) to perform synchronization processing of the monitoring data stored in the databases 13 and files 14 of the master server device and slave server device at a predetermined synchronization period. The transmission and reception of monitoring data between the master and slave server devices is performed via the communication unit 17.

The operator can use the input device 21 to determine which of the two server devices 1, 2 will operate as the master. After the master and slave devices are set in the server devices 1, 2, in this embodiment, the server device in standby state diagnoses the state of the master (the server device operating online). If the master is diagnosed as not normal, in other words, if it is diagnosed as abnormal, the server device that had been operating as the master will end its operation or become a slave, and the server device that had been operating as a slave will switch over to operate as the master.

Figure 2 shows an example of the configuration of monitoring data. In the example of Figure 2, the monitoring data is time-series data in units of seconds. The monitoring data stored in the memory unit of the master unit is periodically transferred in batches of a fixed number to the slave unit. The slave unit writes the monitoring data received from the master unit to its own memory unit, thereby synchronizing the monitoring data between the master unit and the slave unit. When synchronization is complete, the slave unit transfers the time t1 at which synchronization was completed to the master unit, and the master unit records time t1 in its own monitoring data. Time t1 is the time at which the monitoring data was last synchronized by synchronization processing before the two server devices 1 and 2 switched between the master and slave systems.

Furthermore, after the master and slave machines are switched, the new master, which had been operating as the slave until then, stores monitoring data in its own monitoring data storage unit, and the time t2 when the storage of the monitoring data begins is recorded in the monitoring data. Time t2 is the time when monitoring data is first stored in the monitoring data storage unit of the server device that has become the new master after the master and slave switchover of the two servers. The storage period of the monitoring data is compared with the difference time (t2-t1) between times t2 and t1, and based on the comparison result, it is determined whether the storage period of the monitoring data in the monitoring data storage unit has arrived between the data synchronization time (time t1) and the start-up time of the new master (time t2), and a flag X indicating whether or not the monitoring data needs to be supplemented is recorded depending on the determination result.

Flag X is set to "1" if supplementary processing is required, and set to "0" if supplementary processing is not required. If the difference time (t2 - t1) is greater than the storage period of the monitoring data, supplementary processing of the monitoring data is required. If the difference time (t2 - t1) is less than or equal to the storage period of the monitoring data, data for the next storage period will be stored in the new master, so supplementary processing of the monitoring data is not required.

(Synchronization process between the master and slave server devices)
Fig. 3 is a flow chart showing a synchronization process between the server devices 1 and 2. The synchronization process of the monitoring data between the master and slave server devices shown in the flowchart of Fig. 3 is periodically executed by the monitoring system S. The synchronization process of the monitoring data between the master and slave server devices is started with one of the server devices 1 and 2 acting as the master and the other as the slave, and continues thereafter until the monitoring system S is stopped.

When the monitoring system S is started, in step S101, data acquired from the plant 40 and monitoring data based on this data are stored in the memory unit of the main machine. Next, in step S102, the main machine determines whether the transfer timing in the synchronization period of the monitoring data stored in the memory unit has arrived. If it is the transfer timing (step S102 YES), the main machine proceeds to step S103, and if it is not the transfer timing (step S102 NO), the main machine returns to step S101.

In step S103, the master unit transfers the monitoring data from the master unit to the slave unit. The slave unit stores the monitoring data received from the master unit in the memory unit of the slave unit. In this way, the monitoring data is synchronized between the master unit and the slave unit.

Next, in step S104, the slave unit opens the file and analyzes the contents to confirm that the monitoring data synchronized with the master unit has been stored in the slave unit's memory (synchronization of the monitoring data with the master unit has been completed). Next, in step S105, the slave unit transmits the time t1 at which synchronization of the monitoring data was completed to the master unit. Next, in step S106, the master unit records the time t1 received from the slave unit in the monitoring data stored in the master unit's memory.

(Complementary processing of monitoring data using temporary data when switching servers)
Fig. 4 is a flowchart showing the process of complementing monitoring data using temporary data when missing data occurs during server switching. The process of complementing monitoring data using temporary data shown in the flowchart of Fig. 4 is executed when the monitoring system S determines to execute server switching. Server switching is executed when an abnormality occurs in the master machine and it becomes impossible to continue operating as the master machine, so that the master machine and the slave machine are swapped and the monitoring system S can continue operating. Hereinafter, the master machine and the slave machine after the swap are referred to as the "new master machine" and the "new slave machine", respectively.

First, in step S201, the master and slave machines of the monitoring system S execute a server switching process in response to a server switching command to swap the master and slave machines. Next, in step S202, after the server switching process is completed, the new master machine, in which the slave machine in standby operation has transitioned to online operation, records the time t2 at which the switching was completed in the monitoring data of the new master machine.

Next, in step S203, the new master determines the difference in time (t2-t1) between time t2 and time t1, and compares it with the storage period of the master's monitoring data. If the difference in time (t2-t1) between time t2 and time t1 is greater than the storage period of the monitoring data (step S203 YES), the new master proceeds to step S204, and if the difference in time (t2-t1) is less than or equal to the storage period of the monitoring data (step S203 NO), the new master ends the process of complementing the monitoring data using temporary data so that the new master can store data for the next storage period.

In step S204, since it was determined in step S203 that there was missing data in the synchronization of the monitoring data and that supplementary processing was required, the new master sets the data flag X of the monitoring data stored in the memory unit of the new master to 1. Next, in step S205, the new master performs data supplementary processing for the monitoring data for which flag X was set to 1 in step S204 by extracting data that falls within the range from time t1 to time t2 from the temporary data memory unit 16 of the new master and writing it. Next, in step S206, the new master initializes flag X=1 (sets X=0) for the monitoring data for which data supplementary processing was performed in step S205. When step S206 ends, the monitoring system S ends the supplementary processing of the monitoring data using temporary data.

According to the first embodiment, when data loss occurs in the monitoring data when switching servers, the process shown in Figs. 3 and 4 manages the need to repair the lost data and the data loss section using a flag and time, so that the location of the data loss can be quickly identified and the data repair process can be performed.

In the first embodiment, an example was described in which temporary data is used to complement the monitoring data when there is data loss in the monitoring data after switching. In contrast, in the second embodiment, in addition to the first embodiment, when there is data loss in the monitoring data after switching and the complementation process is not complete, the data recorded in the temporary data storage unit 16 is combined with the monitoring data on the display device 20 to display the range of data loss, thereby preventing data loss on the display.

(Display process of monitoring data in the second embodiment)
Fig. 5 is a flowchart showing the display process of monitoring data in the second embodiment. The display process of monitoring data shown in the flowchart of Fig. 5 is executed when the display software operating in the input/display processing unit 15 of the server devices 1 and 2 of the monitoring system S displays the monitoring data on the display device 20. The display software is a display function of the monitoring data on the display device 20 that is realized by being executed by the processors of the server devices 1 and 2. Note that the "master" and "slave" referred to in the display process of monitoring data are the master and slave at the time of executing the display process of monitoring data. Also, the "own device" referred to in the display process of monitoring data is the server device 1 or 2 that executes the display process of monitoring data.

First, in step S301, the display software opens the monitoring data of the main unit. Next, in step S302, the display software references flag X of the monitoring data opened in step S301 to check whether supplementary processing of the monitoring data is necessary. If supplementary processing of the monitoring data is necessary (X=1) (step S302 YES), the display software proceeds to step S303, and if supplementary processing of the monitoring data is not necessary (X=0) (step S302 NO), the display software proceeds to step S304.

In step S303, the display software combines the data other than the data corresponding to the period from t1 to t2 recorded in the monitoring data opened in step S301 with the temporary data stored in the temporary data storage unit 16 of the master corresponding to the period from t1 to t2, and outputs the combined data to the display device 20. While the display software is displaying the data combined in step S303, the synchronization processing unit 19 executes a data complement process for the monitoring data (step S205 in FIG. 4) and completes the data complement process. This gives priority to displaying data without data loss before the data complement process is completed, and by executing the data complement process behind the display, it is possible to improve convenience without making the operator aware of data loss.

On the other hand, in step S304, the display software outputs all of the monitoring data opened in step S301 as is to the display device 20. In this way, the display software switches the read destination of the data to be output to the display device 20 depending on whether or not completion processing is necessary.

When the monitoring data after the server switch has a missing part but the missing data has not been complemented, the monitoring data of the master and the temporary storage data of the master corresponding to the missing part are combined and displayed on the screen by the complementary display process of the monitoring data shown in FIG. 5. On the other hand, when the missing part of the monitoring data after the server switch has been complemented, the monitoring data of the master is displayed on the screen. This makes it possible to always prevent missing data from being displayed on the display device 20. In addition, since the temporary storage data is data within the device itself that is used for complementing the monitoring data, data consistency can be maintained by using the same data to complement missing data on the display.

The monitoring data complement display process shown in FIG. 5 may be executed repeatedly at regular intervals. After a certain period of time has passed, the complement process for missing monitoring data may be completed on the data in the storage unit. Once the complement process is complete, the monitoring data after the complement process is displayed instead of the data complement on the display, resulting in a normal data display.

(Example of display screen 20D of display device 20 based on monitoring data)
Fig. 6 is a diagram showing an example of a display screen 20D of the display device 20 based on monitoring data having data loss in the second embodiment of the present invention. Also, Fig. 7 is a diagram showing an example of a display screen 20D of the display device 20 in which the loss of monitoring data is complemented on the display in the second embodiment of the present invention.

As shown in Figures 6 and 7, the display screen 20D represents time on the horizontal axis and the value of the monitoring data on the vertical axis. The display screen 20D has a screen operation unit 20D1 that accepts input of the plant from which the data is output, the type of monitoring data, the date, the display unit of the monitoring data, the display time of the table monitoring data, etc., for the monitoring data to be displayed. The display unit of the monitoring data is, for example, the time unit of the monitoring data displayed at one time in the display area 20D2 of the monitoring data, such as one hour, one day, one week, etc.

In the example shown in FIG. 6, there is missing data 20D3 that occurs when switching between the master and slave servers 1 and 2, so in the graph of the monitoring data displayed in the display area 20D2, continuity is lost in the missing data 20D3. For this reason, the operator who operates the monitoring system S cannot know the behavior of the monitoring data in the portion of the missing data 20D3 until the completion process is completed.

However, in this embodiment, as shown in FIG. 7, before the missing data complementation process is completed, the monitoring data and temporary data are combined, and the temporary data is used to complement the missing data 20D3 on the display device 20 and display it as a graph. This allows the operator operating the monitoring system S to instantly know the behavior of the monitoring data for the missing data 20D3, and to appropriately control the equipment of the monitored plant.

When the graphical display of the monitoring data in the display area 20D2 is updated at regular intervals, if there is missing data in the monitoring data and the complementation process has not been completed, the monitoring data and temporary data are combined, and the missing data 20D3 is complemented on the display of the display device 20 using the temporary data, and a graph is displayed quickly. On the other hand, when the graphical display of the monitoring data in the display area 20D2 is updated at regular intervals, if the complementation process for the missing data in the monitoring data has been completed, the graph is displayed using the complemented monitoring data.

In Example 2, in a monitoring system that monitors a target, the read destination of read data is switched based on the result of comparing the difference time between the synchronization time when the monitoring data was last synchronized by the synchronization process before switching between the master and slave servers of two servers and the storage time when the monitoring data was first stored in the monitoring data storage unit after switching between the master and slave servers with the storage period in which the monitoring data is stored in the monitoring data storage unit (i.e., the contents of flag X). This makes it possible to prevent data loss on the display device 20 when there is loss in the monitoring data after switching between the master and slave servers but the process of compensating for the loss data has not been completed.

Methods for avoiding data loss on the display of monitoring data are not limited to combining the data in the range of data loss recorded in the temporary data storage unit 16 with the monitoring data on the display device 20. For example, a graph of the entire range of the display target may be created based on the data recorded in the temporary data storage unit 16 and displayed on the display device 20, and after the process of complementing the missing data is completed, the graph may be displayed based on the complemented monitoring data.

In the second embodiment, the process of synthesizing the monitoring data and the temporary data read from the temporary data storage unit 16 with the display software and outputting the data to the display device 20 is executed by the display software operating in the input/display processing unit 15 of the server devices 1 and 2. However, this is not limited to the above, and as shown in FIG. 8, the process of synthesizing the monitoring data and the temporary data read from the temporary data storage unit 16 with the display software and outputting the data to the display device 20 may be executed by the display software operating in the input/display processing unit 15 of the client terminal 3 other than the master and slave. The display software operating in the input/display processing unit 15 of the client terminal 3 can access the database 13 and file 14 of the master and the temporary data storage unit 16 of the slave, and when there is a missing monitoring data, the display software can synthesize the monitoring data and the temporary data read from the temporary data storage unit 16 and output the data to the display device 20 connected to the client terminal 3.

According to the third embodiment, when the monitoring data is referenced from a client terminal, the missing data can be complemented and displayed on the screen, similar to the second embodiment.

(Hardware of Computer 1000)
FIG. 9 is a hardware diagram showing an example of the configuration of a computer 1000 that realizes the server devices 1 and 2 and the client terminal 3.

The computer 1000 is a computer equipped with a processor 1001 including a CPU, a main memory device 1002, an auxiliary memory device 1003, a network interface 1004, an input device 1005, and an output device 1006, all of which are interconnected via an internal communication line 1009 such as a bus.

The processor 1001 controls the operation of the entire computer 1000. The main memory device 1002 is composed of, for example, a volatile semiconductor memory, and is used as a work memory for the processor 1001. The auxiliary memory device 1003 is composed of a large-capacity non-volatile memory device such as a hard disk device, SSD (Solid State Drive), or flash memory, and is used to store various programs and data for long periods of time.

The executable program 1100 stored in the auxiliary storage device 1003 is loaded into the main storage device 1002 when the computer 1000 is started up or when necessary, and is executed by the processor 1001. In this way, the various functional parts of the server devices 1 and 2 and the client terminal 3 that execute various processes are realized.

The executable program 1100 may be recorded on a non-transitory recording medium, read from the non-transitory recording medium by a media reading device, and loaded into the main memory device 1002. Alternatively, the executable program 1100 may be obtained from an external computer via a network and loaded into the main memory device 1002.

The network interface 1004 is an interface device for connecting the computer 1000 to each network within the system or for communicating with other computers. The network interface 1004 is composed of, for example, a NIC (Network Interface Card) for a wired LAN (Local Area Network) or a wireless LAN.

The input device 1005 is composed of a keyboard, a mouse, a pointing device such as a touch sensor, and the like, and is used by the operator to input various instructions and information to the computer 1000. The output device 1006 is composed of a display device such as a liquid crystal display or an organic EL (Electro Luminescence) display, and an audio output device such as a speaker, and is used to present necessary information to the operator when necessary.

The present invention is not limited to the above-mentioned embodiments, but includes various modifications. For example, the above-mentioned embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those having all of the configurations described. It is also possible to replace or combine part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, replace, integrate, or distribute other configurations with respect to part of the configuration of each embodiment. Furthermore, each process shown in the embodiments may be appropriately distributed or integrated based on processing efficiency or implementation efficiency.

1, 2... server device, 3... client terminal, 11, 17... communication unit, 12... data processing unit, 13... database, 14... file, 15... input/display processing unit, 16... temporary data storage unit, 18... control unit, 19... synchronization processing unit, 20... display device, 21... input device, 30... interface unit, 40... plant

Claims (10)

A surveillance system for monitoring an object, comprising:
Two servers constituting a primary and secondary system;
A display processing unit,
Each of the servers
a data processing unit that calculates monitoring data for the object based on data acquired from the object;
a temporary data storage unit for storing the data or the monitoring data as temporary data;
a monitoring data storage unit for storing the monitoring data;
a synchronization processing unit that performs a synchronization process of the monitoring data stored in each of the monitoring data storage units with the other server,
The display processing unit is
displaying information on a display device based on the read data read from the monitoring data storage unit or the temporary data storage unit;
The information is displayed on the display device based on the monitoring data read from the monitoring data storage unit and the temporary data read from the temporary data storage unit when the difference between the synchronization time when the monitoring data was last synchronized by the synchronization process before the switching between the primary and secondary systems of the two servers and the storage time when the monitoring data was first stored in the monitoring data storage unit after the switching between the primary and secondary systems of the two servers is compared with a storage period during which the monitoring data is stored in the monitoring data storage unit.
A monitoring system comprising: 2. The monitoring system of claim 1,
The display processing unit is
A monitoring system comprising: a monitoring unit for monitoring the difference time and the storage period at regular intervals. 2. The monitoring system of claim 1 ,
The synchronization processing unit
A monitoring system comprising: a monitoring unit that performs a process of compensating for missing data in the monitoring data during the differential time by using the temporary data. 4. The monitoring system according to claim 3 ,
The display processing unit is
from when the two servers are switched between the primary and secondary systems until the completion of the complementation process, the monitoring data and the temporary data are combined to complement the missing data on the display device, and the information is displayed on the display device;
after the completion of the complementation process, the information is displayed on the display device based on the monitoring data after the completion of the complementation process. 5. The monitoring system according to claim 4 ,
The synchronization processing unit
and completing the complementation process while the display processing unit combines the monitoring data and the temporary data to complement the missing data on the display device and displays the information on the display device. 5. The monitoring system according to claim 4 ,
The display processing unit is
A monitoring system characterized by identifying a period of missing data in the monitoring data based on the synchronization time and the storage time, and synthesizing the monitoring data outside of that period with the temporary data corresponding to that period to complement the missing data on the display device. 4. The monitoring system according to claim 3 ,
The synchronization processing unit
determining whether or not a compensation process for the missing data in the monitoring data is required based on the synchronization time and the storage time, and recording a flag indicating whether or not the compensation process is required in the monitoring data;
performing the complementation process if the flag indicates the necessity of the complementation process;
and updating the flag to indicate that the complementation process is unnecessary when the complementation process is completed. 2. The monitoring system of claim 1,
The monitoring system, wherein each of the servers includes the display processing unit. 2. The monitoring system of claim 1,
A monitoring system comprising a terminal having the display processing unit. A monitoring method performed by a monitoring system for monitoring an object, comprising:
The monitoring system includes:
Two servers constituting a primary and secondary system;
A display processing unit,
Each of the servers
a data processing unit that calculates monitoring data for the object based on data acquired from the object;
a temporary data storage unit for storing the data or the monitoring data as temporary data;
a monitoring data storage unit for storing the monitoring data;
a synchronization processing unit that performs a synchronization process of the monitoring data stored in each of the monitoring data storage units with the other server,
The display processing unit,
displaying information on a display device based on the read data read from the monitoring data storage unit or the temporary data storage unit;
The information is displayed on the display device based on the monitoring data read from the monitoring data storage unit and the temporary data read from the temporary data storage unit when the difference between the synchronization time when the monitoring data was last synchronized by the synchronization process before the switching between the primary and secondary systems of the two servers and the storage time when the monitoring data was first stored in the monitoring data storage unit after the switching between the primary and secondary systems of the two servers is compared with a storage period during which the monitoring data is stored in the monitoring data storage unit.
A monitoring method comprising:

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