JP2010205210A - Monitoring control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display an accurate trend graph even at a monitoring device connected to a plant similarly as the plant thus to reliably monitor the plant. <P>SOLUTION: A monitoring control system includes: the plants 12a-12n including an obtaining means which obtains the status data regarding the operation status of an own plant from equipment forming the plant in a first cycle, a display means which displays the trend graph on a display device, a storage processing means which accumulates the status data and stores the data in a storage device, and a transmission means which reads the status data stored in the storage device and transmits the data to the monitoring device when receiving a status data request transmitted from the monitoring device via a second network; and the monitoring device 11 including an obtaining means 111a which transmits the status data request to the plant and receives the status data responding to the status data request from the plant in a second cycle, and a display means 111b which displays the trend graph on the display device. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a monitoring control system for monitoring and controlling a plurality of plants.

  Plants such as water purification plants and sewage treatment plants generally operate continuously for 24 hours. In such a plant, in order to monitor the status of the plant, a monitoring screen such as a trend graph representing the status of the plant is displayed on the display device. The monitor who monitors the situation in the plant can monitor the situation of the operating plant by using the change of the displayed trend graph and find an abnormality.

  However, even if the plant operates continuously for 24 hours, there may be no monitoring personnel at night or on holidays. As described above, there is a system for remotely monitoring a plant from a place other than the plant in order to prevent the plant from being monitored when there is no supervisor in the plant (see, for example, Patent Document 1).

  For example, the conventional remote monitoring system 2 includes a monitoring device 21 and a plurality of plants 22 (22a to 22n) as shown in FIG. The monitoring device 21 receives plant data related to the state of the plant from each plant 22 connected via the network 23 and monitors the plant 22 using the received plant data.

  Here, each plant 22 is designed and managed by different managers, and it is general that the configuration and the communication speed of the network 221 are not unified among the plants 22. In each plant 22, the internal configuration, the network 221 and the like can be freely changed according to the situation after the operation is started. On the other hand, the network 23 connecting the monitoring device 21 and the plant 22 generally uses a dedicated network line to ensure security, and frequently changes in accordance with design changes in each plant 22. It cannot be changed. Therefore, the communication speeds of the network 23 connecting the monitoring device 21 and the plant 22 and the network 221 in the plant 22 are generally different.

  In the plant 22, as shown in the sequence diagram of FIG. 12, the network line 221 in the plant 22 is used periodically (for example, every cycle t1) to monitor the plant 21. Situation data is acquired (S01), and a trend graph is generated from the collected situation data and displayed (S02). Thereafter, the acquisition and display of the situation data is repeated periodically (for example, every cycle t1) (S01, S02).

  When the plant 22 acquires and displays the status data (S03, S04), when the monitoring device 21 transmits a plant data request for requesting the plant 22 to transmit the plant data (S05), the plant 22 is in step S03. The received status data is transmitted as plant data to the monitoring device 21 (S06). The monitoring device 21 generates and displays a trend graph from the plant data received in step S06 and monitors the plant 22 (S07).

  In the plant 22, the acquisition and display of information data is repeated regularly (for example, every cycle t 1) (S 03 ′, S 04 ′), and the monitoring device 21 also requests a plant data request as long as the monitoring of the plant 22 is continued. And the reception of plant data are continued regularly (for example, every cycle t2) (S05 ′, S06 ′).

  Moreover, when the monitoring apparatus 21 controls the plant 22, the monitoring apparatus 21 transmits a control signal to the plant 22 (S08).

  Here, the acquisition of the situation data in the plant 22 (S03) is repeated at the cycle t1, and the network 221 in the plant 22 is used. In addition, transmission / reception of plant data (S05 and S06) in the monitoring device 21 is repeated at a period t2, and the network 23 that connects the monitoring device 21 and the plant 22 is used. That is, the situation data acquisition cycle t1 is determined by the performance of the network 221 in the plant 22, and the plant data acquisition cycle t2 is determined by the performance of the network 23 connecting the monitoring device 21 and the plant 22.

  However, the communication speed of the network 23 (for example, 64 Kbps) is generally lower than the communication speed of the network 221 in the plant 22 (for example, 100 Mbps). Further, in the network 23, requests and data are transmitted / received to / from all connected plants 22, and when the network 23 is loaded, communication delay and data loss may occur. That is, it is difficult to synchronize the data acquisition cycle t2 in the monitoring device 21 and the data acquisition cycle t1 in the plant 22.

  Thus, if the periods t1 and t2 of data acquisition are different, for example, in the plant 22, even if the trend graph as shown in FIG. Since the plant data cannot be updated at the update rate of the situation data 22, the same trend graph as that of the plant 22 cannot be displayed as shown in FIG.

Japanese Patent No. 2680214

  As described above, in the conventional monitoring control system 2, it is difficult to synchronize the data acquisition cycle t <b> 2 by the monitoring device 21 and the data acquisition cycle t <b> 1 by the plant 22. There was a problem that the graph was different from the trend graph displayed in the plant 22. Thus, when a trend graph representing a situation different from the actual situation change is displayed, there is a possibility that discovery of an abnormality occurring in the plant 22 may be delayed.

  Accordingly, an object of the present invention is to provide a monitoring control system that can display an accurate trend graph as in the case of a plant and can reliably monitor the plant.

  The supervisory control system according to the feature of the present invention is a supervisory control in which a plant and a monitoring device that monitors the state of the plant are connected via a second network having a communication speed slower than that of the first network used in the plant. In this system, the plant acquires, in a first period corresponding to the communication speed of one network, an acquisition unit that acquires status data related to the operation status of the own plant from the devices forming the plant, and the status data acquired by the acquisition unit Is sent from the monitoring device via the second network, a display means for displaying the trend graph generated by using the display means, a storage processing means for accumulating the situation data obtained by the obtaining means and storing it in the storage device, and When the status data request for requesting the status data is received, the status data stored in the storage device is read and monitored. The monitoring device transmits a status data request to the plant in a second period corresponding to the communication speed of the second network longer than the first period, and from the plant to the status data request. The acquisition means which receives the status data which responds, and the display means which displays the trend graph produced | generated using the status data which the acquisition means received on a display apparatus.

  According to the present invention, an accurate trend graph can be displayed in a monitoring device connected to a plant as well as the plant, and the plant can be reliably monitored.

1 is a block diagram illustrating a monitoring control system according to a first embodiment of the present invention. It is a block diagram explaining the plant of FIG. It is an example of the monitoring screen displayed with the monitoring control system of FIG. It is a sequence diagram explaining an example of the process in the monitoring control system of FIG. It is an example of the status data which the server computer transmits to the monitoring terminal. It is an example of the plant data which the server computer memorize | stores. It is an example of the plant data which the server computer transmits to the monitoring device. It is a sequence diagram explaining an example of the process in the plant of FIG. It is a sequence diagram explaining an example of the process in the monitoring control system which concerns on the 2nd Embodiment of this invention. It is an example of the plant data which the server computer memorize | stores. It is the schematic explaining the conventional monitoring control system. It is a sequence diagram explaining an example of the process in the monitoring control system of FIG. It is an example of the trend graph displayed by the monitoring control system of FIG.

[First Embodiment]
A monitoring control system 1 according to the first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the monitoring control system 1 includes a monitoring device 11 and a plurality of plants 12 (12a to 12n) monitored by the monitoring device 11, and each plant 12 is connected to the monitoring device 11 via a network 17. Is connected.

<Monitoring device>
The monitoring device 11 is connected to a plurality of plants 12 and monitors the status of each plant 12. Specifically, as shown in FIG. 1, the monitoring device 11 is a computer including a central processing unit (CPU) 111, a storage device 112, a display device 113, a communication interface (communication I / F) 115, and the like.

  The monitoring device 11 reads and executes a monitoring program stored in the storage device 112, whereby an acquisition unit 111a that acquires data related to the state of the plant 12 and a display device 113 that displays the data acquired by the acquisition unit 111a. The CPU 111 is mounted and operated with a display means 111b for displaying on the CPU 111 and a control means 111c for controlling the equipment of the plant 12 in accordance with the input control signal.

  The acquisition unit 111a transmits a plant data request for requesting transmission of plant data to the plant 12 through the communication I / F 115 at a predetermined timing. The acquisition unit 111a receives the plant data transmitted from the plant 12 in response to the plant data request via the communication I / F 115. The “predetermined timing” is, for example, a start timing when a control signal for starting monitoring of a plant is input from an operator operating the monitoring device 11 via the input device 114, or a periodic timing after the start timing (for example, , Every cycle T1). The period T1 is determined according to the performance of the network 17 or the like that connects the monitoring device 11 and the plant 12. The “plant data” is data relating to the state of the plant 12 such as the operation state of the device and the measured value by the device.

  The display unit 111b generates a monitoring screen P1 including a trend graph b1 as shown in FIG. 3 using the plant data acquired by the acquisition unit 111a, and displays it on the display device 113. The monitoring screen P1 has, for example, a control button b2 in addition to the trend graph b1, and can control equipment of the plant 12.

  When the control button b2 of the monitoring screen P1 displayed on the display device 113 is operated through the input device 114 and the control signal is input, the control unit 111c receives the control signal input through the communication I / F 115. It transmits to the plant 12 and controls the equipment and the like of the plant 12. This “control signal” is a signal that controls operation, stop, setting of a target value, and the like of the equipment of the plant 12.

<plant>
As shown in FIG. 1, the plant 12 a includes a server computer 13 that provides data necessary for the monitoring device 11 to perform plant monitoring, and a monitoring terminal 14 that is used by a supervisor of the plant 12 a to monitor the plant 12 a. And a control terminal 15 for controlling each device such as the sensor 16a, the pump 16b, and the valve 16c of the plant 12a.

  In the plant 12, as shown in the sequence diagram shown in FIG. 4, the monitoring terminal 14 performs monitoring by repeatedly acquiring the status data regarding the status of operation and the display of the acquired status data (S 11, S 12). . Moreover, if there exists a request | requirement of the plant data regarding the condition of a plant from the monitoring apparatus 11 which is going to monitor the plant 12 (S13), the plant 12 will transmit the plant data acquired by step S11 to the monitoring apparatus 11 (S14). . In the monitoring device 11, the transmitted plant data is displayed (S15).

  Thereafter, the plant 12 repeats acquisition of status data (S16), but displays the acquired status data and stores it as plant data (S17, S18). Further, when there is a request for plant data from the monitoring device 11 (S19), the plant 12 transmits the plant data stored in step S18 to the monitoring device 11 (S20). In the monitoring device 11, the transmitted plant data is displayed (S21). Moreover, the plant 12 may be controlled from the monitoring apparatus 11 (S22).

  The computers in the plant 12a and the terminals 13 to 15 will be described in detail with reference to FIG. Although the plant 12a will be described here, the other plant 12 also includes a server computer 13, a monitoring terminal 14, and a control terminal 15 in the same manner as the plant 12a. On the other hand, since each plant 12 includes equipment necessary for each plant, the same equipment 16a to 16c as the plant 12a may be provided, or different equipment may be provided.

<Server computer>
The server computer 13 is a device that provides data necessary for the monitoring device 11 to monitor the plant 12a. As shown in FIG. 2, a central processing unit (CPU) 131, a storage device 132, and a communication interface (communication I) / F) A computer provided with 133 or the like.

  The server computer 13 reads and executes a program corresponding to the monitoring control system 1 stored in the storage device 132, and executes a status management unit 131a that manages the monitoring status from the monitoring device 11, and a control. Acquisition means 131b for acquiring status data related to the status of the equipment of the plant 12a, etc. from the service terminal 15, first transmission means 131c for transmitting status data to the monitoring terminal 14, and storage processing for storing status data in the storage device 132 Means 131d, second transmission means 131e for transmitting status data relating to the status of the plant to the monitoring device 11, and control means 131f for receiving a control signal from the monitoring device 11 or the monitoring terminal 14 and transmitting it to the control terminal 15. Is mounted on the CPU 131 and operates.

  The status management means 131a manages whether the plant 12a is being monitored from the monitoring device 11 (“monitoring”) or not monitored (“unmonitored”) using a flag or the like. . When the status management device 131a receives a plant data request from the monitoring device 11 and the monitoring status is “unmonitored”, the status management device 131a changes the status to “monitoring”. Further, when the monitoring status is “monitoring”, if a new plant data request is not received within a predetermined time, it is determined that the monitoring by the monitoring device 11 has ended, and “monitoring” is changed to “unmonitored”. change. In the server computer 13, the process differs depending on whether it is “monitoring” or “unmonitored”.

  The acquisition unit 131b transmits a status data request for requesting transmission of status data to the control terminal 15 that controls the device 16 at a predetermined timing. In addition, the acquisition unit 131b receives the situation data transmitted from the control terminal 15 in response to the transmitted situation data request, and stores it in a memory (not shown). The “predetermined timing” is, for example, a periodic timing (for example, every cycle T2) determined by the performance of the network or the like in the plant 12a. The “situation data” is data related to the state of the plant 12 such as the operation state of the device 16 and the measurement value by the device.

  When the acquisition unit 131b receives the status data from the control terminal 15, the first transmission unit 131c transmits the received status data to the monitoring terminal 14. In the case of the example shown in FIG. 5, the first transmission means 131c first transmits the status data (FIG. 5 (a)) acquired at 10:15:00, and then acquires the status data acquired at 10:15:01. The transmission of (FIG. 5B), the transmission of the status data acquired at 10:15:02 (FIG. 5A), and the transmission of the acquired status data are continued in order.

  When the acquisition unit 131b receives the status data from the control terminal 15, the storage processing unit 131d sets the acquired status data as plant data if the monitoring status managed by the status management unit 131a is "monitoring". Store in the storage device 132. When the plant data generated by the situation data received in the past is stored in the storage device 132, the storage processing unit 131d adds the received situation data to the already stored plant data and creates new plant data. To do.

  On the other hand, when the monitoring status managed by the status management unit 131a is “unmonitored” when the plant data request is received from the monitoring device 11, the storage processing unit 131d does not execute the process of storing the plant data.

  For example, when the monitoring status is “being monitored” and the status data acquired at 10:15:00 is stored as plant data in the storage device 132 as shown in FIG. When 131b acquires new status data at 10:15:01, the storage processing unit 131d updates the plant data with the newly acquired status data, as shown in FIG. 6B. When the acquisition unit 131b acquires new situation data at 10:15:02, the storage processing unit 131d updates the plant data with the newly acquired situation data as shown in FIG. 6C.

  When the second transmission unit 131e receives a plant data request from the monitoring device 11, if the monitoring status managed by the status management unit 131d is “unmonitored”, the second transmission unit 131e receives the status data received immediately before by the acquisition unit 131b. It transmits to the monitoring apparatus 11 as plant data.

  On the other hand, if the monitoring status managed by the status management means 131d is “monitoring” when the plant data request is received, the second transmission means 131e monitors the plant data stored in the storage device 132. 11 and the plant data transmitted to the monitoring device 11 is deleted from the storage device 132. That is, the storage device 132 stores only untransmitted plant data in the monitoring device 11 that is monitoring the plant 12a, and the transmitted plant data is deleted.

  Specifically, when the monitoring status is “unmonitored” and a plant data request is received, the second transmission unit 131e, as shown in FIG. 7 (a), uses only the status data received immediately before as plant data. And send with header information. On the other hand, when the monitoring status is “monitoring” and the plant data request is received, the second transmission unit 131e adds header information to the plant data generated by storing the status data, as shown in FIG. And send it.

  When the control unit 131f receives a control signal for controlling operation, stop, setting of a control target value, etc. of the equipment of the plant 12a from the monitoring device 11 or the monitoring terminal 14, the received control signal is sent to the control terminal 15. Send.

  Here, the server computer 13 transmits and receives data via the communication I / F 133 when performing data communication with the monitoring terminal 14 and the control terminal 15 in the plant 12a. The server computer 13 transmits and receives data via the communication I / F 133 and the network 17 when performing data communication with the monitoring device 11 outside the plant 12a.

《Monitoring terminal》
The monitoring terminal 14 is a device used by a supervisor who monitors the operation status of the plant 12a in the plant 12a. As shown in FIG. 2, a central processing unit (CPU) 141, a storage device 142, and a display device are used. 143, an input device 144, a communication interface (communication I / F) 145, and the like.

  The monitoring terminal 14 reads and executes a program corresponding to the monitoring control system 1 stored in the storage device 142, thereby obtaining the plant 12 a from the situation data regarding the operation status of the plant acquired from the server computer 13. The CPU 141 is mounted with a display unit 141a that generates a monitoring screen to be used for monitoring and displays it on the display device 143, and a control unit 141b that controls the plant 12a in accordance with a control signal input via the input device 144. Works.

  When receiving the status data from the server computer 13 via the communication I / F 145, the display means 141a generates a monitoring screen P2 as shown in FIG. 3B from the received status data and displays it on the display device 143. To do. The supervisor of the plant 12a can grasp the status of the plant 12a by referring to the monitoring screen P2. For example, the monitoring screen P2 displayed on the display device 143 of the monitoring terminal 14 is a control for controlling the trend graph b3 of the operation status of the equipment 16 such as a pump in the plant 12a and the status 16 such as the water level and the equipment 16 of the plant 12a. Button b4 etc. are displayed.

  Here, the monitoring screen P2 displayed on the display device 143 of the monitoring terminal 14 shown in FIG. 3B and the monitoring screen P1 displayed on the display device 113 of the monitoring device 11 shown in FIG. Both screens are generated based on the situation data acquired by the acquisition means 131b of the server computer 13. However, in the monitoring terminal 14, the monitoring screen P2 is generated and displayed in accordance with the acquisition cycle T2 of the status data in the plant 12a, whereas in the monitoring device 11, the monitoring data is displayed at the plant data acquisition cycle T1. In addition, the monitoring screen P1 is generated and displayed. Therefore, as shown in FIG. 3, even if the trend graph represents the same information, the trend graph displayed on the monitoring device 11 is delayed.

  When a control signal for controlling the device is input from the screen via the input device 144, the control unit 141b transmits the input control signal to the control terminal 15 via the communication I / F 145.

《Control terminal》
The control terminal 15 is a device that controls the devices 16 a to 16 c in the plant 12, and as shown in FIG. 2, a communication interface that communicates with the central processing unit (CPU) 151, the storage device 152, and the server computer 13. (Communication I / F) 153 or the like.

  The control terminal 15 collects information to be monitored such as the operation status and water level of a pump in the plant by reading and executing a program corresponding to the monitoring control system 1 stored in the storage device 152. The CPU 151 includes a transmission unit 151a that transmits to the server computer 13 and a control unit 151b that receives an instruction from the server computer 13 and controls operation of a device such as a pump and a target value.

  When receiving the status data request from the server computer 13, the transmission unit 151 a generates status data including the current status of each device 16 and transmits it to the server computer 13.

  When receiving a control signal for controlling the device 16 from the monitoring device 11 or the monitoring terminal 14 via the server computer 13, the control unit 151 b controls the device 16 according to the received control signal.

  Here, the control terminal 15 transmits and receives data via the communication I / F 153 when performing data communication with the server computer 15 in the plant 12a.

<Processing in the supervisory control system>
The flow of processing in the monitoring control system 1 will be described using the sequence diagram shown in FIG. Since the sequence diagram of FIG. 8 corresponds to the sequence diagram of FIG. 4, the same processes as those in FIG.

  Initially, it is assumed that the plant 12a is not monitored by the monitoring device 11, and the monitoring status is “unmonitored”. When acquiring status data (step S11), the acquisition means 131b of the server computer 13 transmits a status data request to the control terminal 15 (S111). The transmission means 151a of the control terminal 15 collects necessary data from the device 16 and transmits the situation data (situation data A) in response to the situation data request received in step S111 (S112). The acquisition unit 131b stores the status data (status data A) received in step S112 in the memory. The first transmission unit 131c transmits the situation data (situation data A) received in step S112 and stored in the memory to the monitoring terminal 14 (S113).

  The display unit 141a of the monitoring terminal 14 generates a monitoring screen P2 as shown in FIG. 3B from the status data (status data A) received in step S113, and displays it on the display device 143 (S12).

  Thereafter, the acquisition unit 111a of the monitoring device 11 transmits a plant data request to the plant 12a (S13). When the plant data request is received in step S13, the monitoring status of the plant 12a becomes “monitoring”. The second transmission means 131e of the server computer 13 transmits the latest acquired status data (status data A) to the monitoring device 11 as plant data (S14).

  The display unit 111b of the monitoring device 11 generates a monitoring screen P1 as shown in FIG. 3A from the plant data (status data A) received in step S14, and displays it on the display device 113 (S15).

  In the plant 12a, after acquisition of the situation data in step S11, the transmission of the situation data request and the transmission of the situation data (S161, S162, S163) are repeated at a predetermined timing (for example, every cycle T2) as in step S11. .

  The display unit 141a of the monitoring terminal 14 generates a monitoring screen P2 from the status data received in step S113 and displays it on the display device 143 (S17). Furthermore, since the plant 12a is “being monitored” by the monitoring device 11, the storage means 131c of the server computer 13 stores the status data received in step S162 in the storage device 132 as plant data (S18). The plant 12a repeats the processes in steps S16 to S18 until a new plant data request is received from the monitoring device 11. Therefore, in the storage device 132, a plurality of situation data (situation data B) obtained in step 162 is obtained as plant data. ~ N) are stored.

  As long as the monitoring device 11 continues to monitor the plant 12a, the monitoring device 11 transmits a plant data request at a predetermined timing (for example, every cycle T1). When the plant 12a newly receives a plant data request from the monitoring device 11 (S19), the second transmission unit 131e reads the plant data (situation data B to N) stored in the storage device 132 in step S18, It transmits to the monitoring apparatus 11 (S20).

  The display unit 111b of the monitoring device 11 generates the monitoring screen P1 from the plant data (status data B to N) received in step S20 and displays it on the display device 113 (S21).

  As described above, in the monitoring control system 1 according to the first embodiment of the present invention, the plant 12 is not monitored by the monitoring device 11 and is not transmitted to the monitoring device 11 every time new status data is acquired. The status data to be acquired is accumulated and stored, and transmitted at the timing when the request is received from the monitoring device 11. Therefore, the monitoring device 11 can display plant data (trend graph) similar to the situation data (trend graph) displayed in the plant 12.

  In the monitoring device 11, the trend graph is displayed a little after being displayed on the monitoring terminal 14 of the plant 12, but the trend graph displayed on the monitoring terminal 14 is missing because the data constituting the trend graph is missing. Compared to displaying a trend graph different from the graph, the influence on the monitoring of the plant 11 is small.

[Second Embodiment]
Since the monitoring control system according to the second embodiment has the same configuration as that of the monitoring control system 1 described above with reference to FIGS. 1 and 2, it will be described with reference to FIGS.

  In the monitoring control system 1 according to the first embodiment described above, the plant 12a receives a plant data request from the monitoring device 11 and receives it when “monitoring”, as in the sequence diagram shown in FIG. Situation data was stored as plant data. On the other hand, in the monitoring control system 1 according to the second embodiment, the storage processing unit 131d always stores newly acquired status data as plant data. In addition, the storage processing unit 131d deletes data that has passed for a fixed time from the plant data accumulated and stored in the storage device 132. Here, the period in which the data is stored is determined according to the storage capacity of the storage device 132 and the timing at which the situation data is acquired by the plant 12.

  Specifically, as shown in the sequence diagram shown in FIG. 9, the acquisition unit 131b of the server computer 13 acquires status data (S31). Thereafter, the display unit 141a of the monitoring terminal 14 generates the monitoring screen P2 from the status data acquired by the acquisition unit 131b in step S31 and displays it on the display device 143 (S32). The storage processing unit 131d of the server computer 13 updates the plant data with the new situation data acquired by the acquisition unit 131b in step S31, and stores the updated plant data in the storage device 132 (S33).

  In step S33, the storage processing unit 131d deletes, from the original plant data, the status data that has passed for a certain period of time when the plant data is updated using the status data newly acquired in step S31. For example, it is assumed that the plant data shown in FIG. 10A is stored in the storage device 132 and a rule for deleting data after 20 minutes has been set. At this time, if the acquisition unit 131b acquires new status data at “10:35:00”, the storage processing unit 131d adds the newly acquired status data and “10:15:00”. The status data acquired in “seconds” is deleted from the plant data and used as new plant data.

  Thereafter, the plant 12a repeats the processes of steps S31 to S33 until a plant data request is received from the monitoring device 11.

  When the plant 12a receives the plant data request 34 from the monitoring device 11 (S34), the second transmission means 131e of the server computer 13 transmits the plant data stored in the storage device 132 to the monitoring device 11 (S35). . When the plant data is transmitted in step S35, the transmitted plant data is erased from the storage device 132, and the plant data is generated again and stored with new situation data acquired in the process repeated thereafter.

  Further, the display unit 111a of the monitoring device 11 generates and displays the monitoring screen P1 from the plant data received in step S35 (S36). The monitoring apparatus 11 can also control the plant 12a by transmitting a control signal (S37).

  As described above, in the monitoring and control system 1 according to the second embodiment of the present invention, the plant 12b is not monitored by the monitoring device 11 and is not transmitted to the monitoring device 11 every time new status data is acquired. The status data to be acquired is accumulated and stored, and transmitted at the timing when the request is received from the monitoring device 11. Therefore, the monitoring device 11 can display plant data (trend graph) similar to the situation data (trend graph) displayed in the plant 12b.

  In the monitoring control system 1 according to the first embodiment, the server computer 13 receives the plant data request from the monitoring device 11 and then starts storing the plant data in the storage device 132. It is not possible to display the trend graph before On the other hand, in the monitoring control system 1 according to the second embodiment, since the plant data is stored before the plant data request is received, the plant data is transmitted before the plant data request is transmitted. A trend graph can be displayed.

  In the monitoring device 11, the trend graph is displayed a little after being displayed on the monitoring terminal 14 of the plant 12, but the trend graph displayed on the monitoring terminal 14 is missing because the data constituting the trend graph is missing. Compared to displaying a trend graph different from the graph, the influence on the monitoring of the plant 11 is small.

1a ... supervisory control system 11 ... monitoring device 111 ... CPU
111a ... acquisition means 111b ... monitoring screen display means 111c ... control means 112 ... storage device 113 ... display device 114 ... input device 12 (12a-12n) ... plant 13 ... computer for server 131 ... CPU
131a ... Acquisition means 131b ... First transmission means 131c ... Storage processing means 131d ... Second transmission means 132 ... Storage device 14 ... Monitoring terminal 141 ... CPU
141a ... Display means 141b ... Control means 142 ... Storage device 143 ... Display device 144 ... Input device 15 ... Control terminal 151 ... CPU
151a ... transmission means 151b ... control means 152 ... storage device 16 (16a to 16c) ... device 17 ... network

Claims (4)

A monitoring control system in which a plant and a monitoring device for monitoring the state of the plant are connected via a second network having a communication speed slower than that of the first network used in the plant,
The plant is
Acquisition means for acquiring status data relating to the operation status of the own plant from the equipment forming the plant in a first period corresponding to the communication speed of the one network;
Display means for displaying a trend graph generated using the situation data acquired by the acquisition means on a display device;
Storage processing means for accumulating the situation data acquired by the acquisition means and storing it in a storage device;
When receiving a status data request for requesting status data transmitted from the monitoring device via the second network, transmission means for reading the status data stored in the storage device and transmitting the status data to the monitoring device; Prepared,
The monitoring device
An acquisition means for transmitting a status data request to the plant in a second cycle corresponding to the communication speed of the second network longer than the first cycle, and receiving status data in response to the status data request from the plant;
Display means for displaying a trend graph generated using the status data received by the acquisition means on a display device;
A supervisory control system characterized by that.   The monitoring control system according to claim 1, wherein the storage processing unit starts storing the acquired status data after receiving the status data request transmitted from the monitoring device.   The storage processing means ends storage of newly acquired situation data when no new situation data request is received even after a predetermined time has elapsed after receiving the situation data request. The monitoring control system described in 1.   The monitoring control system according to claim 1, wherein when storing new situation data in the storage device, the storage processing unit deletes the situation data acquired in the past and passed for a predetermined time from the storage device.

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