JP2013109710A - Monitoring control system - Google Patents

Abstract

The present invention provides a monitoring and control system capable of collecting data from each machine station and setting operation to each machine station at an appropriate timing even in a situation where a time difference between systems occurs.
SOLUTION: A machine station server station having a clock whose time can be adjusted periodically by a time server is provided for each of a plurality of machine stations A, B,... If the general server station has a clock, and each machine server station sends its own alarm information along with time data to the general server station at regular intervals, and the general server station cannot adjust the time with the time server. If the machine server station cannot synchronize the time with the time server, the process related to data exchange with a plurality of machine server stations is shifted in time difference.
[Selection] Figure 1

Description

  Embodiments described herein relate generally to a monitoring control system that performs overall monitoring control of a plurality of aircraft via a communication network.

  Usually, this type of supervisory control system is provided as a supervisory control system for each machine station (hereinafter referred to as a machine station system) operating in a plurality of scattered plants (machine stations). Management of multiple plants by connecting a supervisory control system (hereinafter referred to as the system on the supervisory side) via a communication network and collecting data from each plant on the supervisory side and performing setting operations as necessary It is carried out.

  In such a supervisory control system, each of the supervisory system and the machine system has a server station. The central server station has a human interface station that collects data from each plant via a communication network and performs setting operation output as necessary, and displays the data collected from each plant. The server station on the machine station side has functions for collecting data in the plant, creating human interface display information, data filing, and setting operation output. Then, the data collected in the plant is displayed on the human interface station in the machine, the state of the equipment in the plant is distributed to the supervisor, and the equipment is controlled.

  The supervisory system and the machine system operate based on the time of the clock of each server station. The clocks of these server stations are regularly set to the time of a device (hereinafter referred to as a time server) that provides a reference time in the control station and each machine station. The system on the supervising side and each machine station are connected by a communication network. In order to be able to operate at the correct time even when this communication network is disconnected, each time server is prepared and the time is adjusted individually. Yes.

  As described above, the time on the supervisory system and each system on the machine floor are synchronized with the time server individually, so that the times of all the supervisory control systems are substantially in agreement. For this reason, when the supervisory system collects data from the system at each station or when setting operation output from the supervisory system to the system at each station, processing is performed based on the time of the supervisory system. It works by judging the execution time.

JP 2004-199211 A

  In such a monitoring and control system, when a time server fails or when a portion connected to the time server fails, the corresponding server station cannot adjust the time with the reference time, and the server station itself It will operate based on the clock. Usually, since the clocks of the server stations have variations in accuracy, a time lag occurs between the respective systems.

  As mentioned above, the system on the supervising side collects data from each machine and performs setting operations for each machine. However, if there is a time lag between the system on the machine and each machine, it is necessary on the supervising side. There are cases where data cannot be collected, or setting operation output cannot be performed to the machine system at the correct timing.

  For example, if the clock at the central server station is ahead of the clock at the machine server station, the system on the aircraft side is correct even if the central system attempts to collect data created on the aircraft side every hour. There is a case where the data is not created because it is not time, and the collected data may be an unmeasured value.

  In addition, if the clock at the central server station is behind the clock at the machine station station, the system on each machine side will be responsible for the control side even when the parameters required for control are set by the supervisor. In this system, since the set time is not reached, setting is not performed, and control may not be performed.

  The problem to be solved by the present invention is that the time adjustment with the reference time cannot be performed, and even in the situation where the time between the systems is shifted, the data collection from each machine by the supervising side and the setting to each machine An object of the present invention is to provide a supervisory control system that can be operated at an appropriate timing.

  A supervisory control system according to an embodiment of the present invention is a supervisory control system that supervises and controls a plurality of machines via a communication network, and is provided for each of the plurality of machines. A clock server that has a clock that can be synchronized with the clock, a machine station server station that monitors and controls the device to be controlled based on the time counted by the clock, and a clock that is provided on the supervising side and that can be synchronized with the time server periodically And a central server station that supervises and controls the plurality of machine stations by sending and receiving control data to and from the plurality of machine server stations via the communication network based on the time counted by the clock. And the plurality of machine station servers define alarm information on the presence or absence of defects in the machine station together with time data. Alarm transmission means for transmitting to the central server station via the communication network in the period, and the central server station is unable to adjust the first time for detecting a state in which the time of its own clock cannot be synchronized with the time server. A second non-time-adjustable detection for detecting whether there is a clock that cannot be timed with the time server among the clocks of each machine server station from the alarm information sent from the plurality of machine server stations; Means, a time difference detecting means for obtaining a time difference between the time of the own clock and time data sent from a plurality of machines, and the first clock is detected by the first time adjustment impossible detecting means. When a state that cannot be matched is detected, monitoring and control of the plurality of machine station servers is performed. If the time difference detection means shifts the time difference obtained by the time difference detection means and the second time adjustment impossibility detection means detects that the clock of any machine server station cannot be timed, the machine server station And a process execution time adjusting means for shifting the time difference obtained by the time difference detecting means to perform processing relating to monitoring and control data exchange.

It is a figure which shows the monitoring control system which concerns on one embodiment of this invention. It is a figure which shows the structure of the system by the side of the supervision in one embodiment of this invention. It is a figure which shows the structure of the system of the machine place in one embodiment of this invention. It is a figure explaining the communication content in one embodiment of this invention. It is a figure which shows the structure of the central server station in one embodiment of this invention. It is a figure which shows the structure of the machine station server station in one embodiment of this invention.

  Embodiments of a monitoring control system according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a system configuration of a monitoring control system according to this embodiment. In FIG. 1, the system 11 on the supervising side and the systems 12 of the plurality of machine stations A, B,... X are connected by a communication network 13.

  As shown in FIG. 2, the central system 11 includes a central server station 21 that collects data from each plant (machine) A, B,... X, and outputs a setting operation as required. A general human interface station 22 that displays data collected from A, B,... X, and is connected to the machine station side via the router 23 via the communication network 13.

  The central server station 21 has a clock that is provided on the central side and that can be timed periodically by a device (hereinafter, a time server) 24 that provides a reference time. Then, based on the time counted by the clock, monitoring and control data are exchanged with the system 12 of the plurality of machine stations A, B,... X via the communication network 13, and the plurality of machine stations A, B, ... X are supervised and controlled.

  As shown in FIG. 3, the system 12 on the machine station side distributes the state of the machine server station 31, the machine human interface station 32 that displays data collected in the plant, and the equipment 33 in the plant to the server station 31. A real-time control station 34 for controlling the device 33 and a router 35 for connecting to the system 11 on the controlling side via the communication network 13 are provided.

  The machine field server station 31 is provided for each of a plurality of machine fields A, B,... X, and has a clock that can be timed periodically by the time server 36 for each machine field. And based on the time which this timepiece measures, the control object apparatus 33 is monitored and controlled. That is, the machine station station 31 has functions for collecting data in the plant, creating display information, data filing, setting operation output, and the like, and monitors and controls the control target device 33 by these functions.

  As described above, the central system 11 and the machine system 12 operate based on the time of the clocks of the respective server stations 21 and 31. As shown in FIGS. 2 and 3, the clocks of these server stations 21 and 31 are periodically set to the time servers 24 and 36, respectively. That is, the system 11 on the supervision side and the system 12 on each machine are connected by the communication network 13, but the time servers 24 and 36 are respectively provided so that they can operate at the correct time even when the communication network 13 is disconnected. Prepare and adjust the time.

  2 and 3, the server stations 21 and 31 are directly connected to the corresponding time servers 24 and 36. However, the time servers 24 and 36 are connected to a communication network (not shown) on the control side and each machine station. In addition, the server stations 21 and 31 may perform time adjustment via this communication network.

  As shown in FIG. 4, the communication contents between the system 11 on the supervising side and the system 12 on each machine are such that alarm information is read from the system 12 on each machine by the supervising system 11 at regular intervals. Data can be classified into three types: data collection from the system 12 of each machine by the system 11 and setting operation output to the system 12 of each machine by the system 11 on the supervising side.

  Here, as shown in FIG. 5, the central server station 21 provided in the central system 11 includes a first time non-adjustment detection unit 211, a second time non-adjustment detection unit 212, and a time difference detection unit 213. And a process execution time adjusting unit 214. The first time adjustment impossibility detecting means 211 detects a state in which the time of its own clock (the clock of the central server station 21) cannot be adjusted due to a failure of the time server 24 or the like. The second time adjustment impossibility detecting means is a clock that cannot be timed with the time server 36 in the clock of each machine server station 21 from the alarm information shown in FIG. 4 sent from a plurality of machine server stations 21. Detect if there is. The time difference detection means 213 obtains the time difference between the time of its own clock (the clock of the central server station 21) and time data sent from a plurality of machine stations. When the first time adjustment impossibility detection means 211 detects that the clock of the central server station 21 cannot adjust the time with the time server 24, the process execution time adjustment means 214 monitors the plurality of machine server stations 31 and outputs control data. Time adjustment is performed to shift the time difference obtained by the time difference detection means 213 for the processing related to the transfer. Further, when the second time adjustment impossibility detecting means 212 detects that the clock of any machine server station 31 cannot be set, the process relating to monitoring and control data transmission / reception with respect to the machine server station 31 is performed. A time adjustment for shifting the time difference obtained by means 213 is performed.

  As shown in FIG. 6, the plurality of machine site server stations 31 include an alarm transmission unit 311, a data collection unit 312, and a parameter setting unit 313. The alarm transmission unit 311 transmits alarm information related to the presence or absence of a defect in the own machine field to the central server station 21 via the communication network 13 at a fixed period (for example, one second period) together with time data. The data collection means 312 collects data in the own plant (such as the state signal of the device 33 and various state quantity measurement values), and according to a request from the central server station 21 (for example, every hour) ) Is transmitted to the central server station 21 via the communication network 13. The parameter setting means 313 sets parameters required for control sent from the central server station 21 at a predetermined control time, and outputs them to the real-time control station 34 to control the device 33 shown in FIG.

  The above-described data collection request and parameter setting output from the system 11 on the control side to the system 12 on each machine reads the execution time from the information set in the system 11 on the control side in advance and executes it at the determined time. . In this case, the system 11 on the controlling side and the system 12 on each machine site periodically adjust the time with the time servers 24 and 36 individually, so that the time of all the monitoring control systems 11 and 12 is substantially the same. It has become. For this reason, when the system 11 on the controlling side makes a data collection request to the system 12 at each machine station, or when a parameter setting operation output is performed from the system 11 on the controlling station to the system 12 at each machine station, Based on the time of the system 11 (the clock time of the central server station 21), the processing execution time is determined and executed.

  In the above configuration, the system 11 on the supervising side reads out alarm information from the machine system 12 at regular intervals, and monitors whether there is an abnormality in the machine system 12. The machine system 12 recognizes that monitoring is being performed from the supervisory system 12 when alarm information is read from the supervisory system 11 at regular intervals.

  As shown in FIGS. 2 and 3, time servers 24 and 36 are connected to the systems 11 and 12, and the server stations 21 and 31 receive time from the time servers 24 and 36, and time is set at the reference time. By performing the matching, the times of the respective systems 11.12 are almost the same. The timing for performing this time adjustment has the following restrictions. For example, it is assumed that the machine server station 31 performs data summing processing for one hour at every hour on the hour. In this case, the time change in several minutes before and after the hour and the time change across the hour are not performed, so that the data aggregation process at every hour is not affected. In addition, if the time change across the time at which the plant control is executed is performed, the control may not be executed. Therefore, it is necessary to prohibit the time change across the control execution time. Therefore, the time adjustment with the time server 36 is performed at a frequency of, for example, about once per day while avoiding such a restricted time zone.

  When the time servers 24 and 36 connected to the server stations 21 and 31 are normal and the times of the system 11 on the central side and the system 12 on each machine are almost the same, the system 11 on the central side When data for one hour is totaled from the machine system 12, a setting is made so that the collection is executed after 5 minutes every hour on the hour when the totaling process in the machine system 12 is completed. In addition, the parameters necessary for the control are set at a time with a margin in advance, for example, set five minutes before the next control execution.

  On the other hand, when one of the time servers 24 and 36 becomes abnormal and the time of the system 11 or 12 cannot be set to the reference time, a time difference occurs between the system 11 on the controlling side and the system 12 on the machine station. There is a possibility. In this case, the system 11 on the supervision side needs to collect data for one hour and perform setting operation output based on the time of the system 12 at the machine station.

  The fact that the machine system 12 is unable to perform time adjustment with the time server 36 is detected by the second time adjustment impossibility detection means 212 from the alarm information generated in the machine system 12. As described above, the server station 31 of the machine system 12 periodically communicates with the time server 36 to monitor the state of the time server 36 and determines that it is abnormal when communication with the time server 36 is disabled. To do. The system 11 on the supervising side checks whether the time server 36 has an abnormality in the alarm information of each machine that the second time adjustment impossibility detecting means 212 collects from the machine system 12 at regular intervals. Then, the abnormal time server 36 is detected.

  The system 11 on the supervising side detects the abnormality of the time server 24 with which it communicates by the first time adjustment impossible detection means 211 in the same manner as the server station of the machine system 12 at the machine station. That is, by periodically communicating with the time server 24, the state of the time server 24 is monitored, and when communication with the time server 24 cannot be performed, it is determined that there is an abnormality.

  When the time server 24 connected to the central system 11 becomes abnormal, the central server station 21 determines that the time has shifted from the system 12 of all the machines, and together with the alarm information, has a fixed period. Based on the time from the system 12 of each machine collected in (1), the processing execution time relating to the transfer of monitoring and control data is adjusted. When the time server 36 connected to the machine system 12 becomes abnormal, only the machine system 12 where the time server 36 becomes abnormal is monitored based on the time of the machine, and processing related to transmission / reception of control data Adjust the execution time.

  The process execution time is adjusted by the time difference detection means 213 and the process execution time adjustment means 214. In other words, the time difference detection means 213 obtains the difference between the time of the system 11 on the supervising side and the time of the system 12 of each aircraft collected at a fixed period. Then, the time for executing data collection and the time for setting parameters necessary for control are shifted by the processing time adjustment unit 214 by the time difference obtained by the time difference detection unit 213. As a result, parameter setting operation output necessary for data collection and control can be normally executed.

  For example, in the setting in which the central system 11 makes a data collection request to the machine system 12 after 5 minutes every hour, the time of the machine system 12 is 5 minutes behind the central system 11 The system 11 on the supervising side adds the delay of 5 minutes from the machine system 12 to the execution time of 5 minutes on the system 11 on the supervising side, and the data at 10 minutes on the hour (5 minutes on the hour at the time of the machine system 12). The execution time of the system 11 on the supervising side is adjusted so as to execute the collection. Thus, since the data collection is executed by the system 11 on the supervising side after the hourly data aggregation processing is completed in the machine system 12, the collected data does not become unmeasured values.

  As described above, in a situation where time adjustment with the time server 24 or 36 cannot be performed, the preset execution time is adjusted based on the time difference between the system 11 on the supervision side and the system 12 on the machine station. Data collection and setting operation output in accordance with the operation of the machine system 12 can be performed.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 11 ... Control side system 12 ... Machine system 13 ... Communication network 21 ... Control server station 211 ... First time adjustment impossible detection means 212 ... Second time adjustment impossible Detection means 213 ... Time difference detection means 214 ... Processing execution time adjustment means 24 ... Time server 31 ... Machine server station 311 ... Alarm transmission means 312 ... Data collection means 313 ... Parameters Setting means 33 ... Control target device 36 ... Time server

Claims (3)

A supervisory control system that supervises and controls a plurality of aircraft via a communication network,
A machine server station that is provided for each of the plurality of machines, has a clock that can be set by a time server periodically for each machine, and monitors and controls the control target device based on the time counted by the clock;
A clock is provided on the supervising side, and the time can be adjusted periodically by a time server. Based on the time counted by the clock, monitoring and control are performed with the plurality of machine station servers via the communication network. With a central server station that exchanges data and supervises and controls these multiple machines,
Each of the plurality of machine server stations has alarm transmission means for transmitting alarm information regarding the presence or absence of a defect in the own machine machine with time data to the central server station via the communication network at regular intervals.
The central server station includes a first time adjustment impossible detection unit for detecting a state in which the time of the own clock cannot be adjusted with the time server, and the alarm information sent from the plurality of machine server stations to each machine server. Time of second time non-adjustment detecting means for detecting whether there is a clock whose time cannot be adjusted with the time server in the clock of the station, and time of own clock and time data sent from a plurality of machine stations When the time difference detecting means for obtaining the difference and the first time non-adjustable detecting means detect that the time of the own clock cannot be timed with the time server, processing relating to monitoring and control data exchange with respect to the plurality of machine station servers The time difference obtained by the time difference detecting means is shifted, and the second time adjustment impossible detection is performed. When it is detected by the means that the clock of any machine server station cannot be set, the process execution time adjustment is performed by the time difference detecting means to perform processing relating to monitoring and transmission / reception of control data for the machine server station. And a monitoring control system characterized by comprising:   2. The machine station server station according to claim 1, wherein the machine server station transmits state data for a predetermined period collected from a control target of the machine station to the central server station in response to a request from the central server station. Supervisory control system.   The monitoring control system according to claim 1, wherein the central server station transmits a parameter necessary for the control to the plurality of machine station server stations at a predetermined control time.

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