JP2011146989A - Monitoring and controlling system, device to be monitored and controlled, and server - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique with which alarm information on a fault that occurs in a monitored and controlled device, is transmitted/received without missing, while suppressing congestion of a network. <P>SOLUTION: A monitoring and controlling system having a plurality of devices to be monitored and controlled, and a server for monitoring and controlling the plurality of devices to be monitored and controlled. Each of the devices to be monitored and controlled is equipped with: a transmitting section for transmitting a generated command to the server; a receiving section for receiving a response to the command from the server; a network monitoring section for measuring a response time from transmission of the command to reception of the response to monitor the congestion state of the network; and a control section which monitors a fault that occurs in the device itself, and controls the transmission to the server in accordance with the congestion state of the network while using information on the caused fault as the alarm information. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a monitoring control system, a monitored control device, and a server that can suppress network congestion.

  2. Description of the Related Art Conventionally, various techniques for performing monitoring control of a monitored control device by a server or the like without congesting a network have been developed.

  For example, in Patent Document 1, when a large number of alarms occur, the monitored device performs centralized monitoring by performing alarm message transmission processing and polling signal accumulation processing for polling signals from the centralized monitoring device. A technique is disclosed in which the alarm message collection processing of the apparatus is not congested.

JP 2001-223722 A

  However, in the prior art, for example, when the monitored control device is turned on or restored from a failure, a large amount of polling signals and alarm messages are exchanged and the network is likely to be congested.

  Also, in Patent Document 1, when the network congestion state continues for a long time, the alarm message is accumulated in a storage device such as a memory, and the capacity of the storage device is exceeded, and a part of the alarm message is lost.

  SUMMARY OF THE INVENTION In view of the above-described problems of the prior art, an object of the present invention is to provide a technique capable of suppressing congestion of a network and transmitting / receiving alarm information of a failure that has occurred in a monitored control device without loss.

  In order to solve the above problems, a monitoring control system of the present invention is a monitoring control system having a plurality of monitored control devices and a server that monitors and controls the plurality of monitored control devices, and the monitored control device includes: Monitor the network congestion status by measuring the response time from sending a command to receiving a response after sending the command to the sending unit that sends the generated command to the server, the receiving unit that receives the response from the server to the command A network monitoring unit, and a control unit that monitors a failure that occurs in itself and controls transmission to the server according to a congestion state of the network using information on the failure that has occurred as alarm information.

  Further, the network monitoring unit may determine a load level indicating the degree of network congestion based on the response time, and the control unit may transmit alarm information to the server according to the load level.

  The network monitoring unit calculates a response probability that a response from the server to the command is received, determines a load level indicating a degree of network congestion based on the response time and the response probability, and the control unit The alarm information may be transmitted to the server according to the load level.

  Further, the control unit may set an alarm level indicating the degree of importance of the alarm information, and transmit the alarm information to the server according to the load level and the alarm level.

  The monitored control device may include a storage unit, and the control unit may store the alarm information in the storage unit in response to the transmission of the alarm information to the server according to the load level and the alarm level.

  In addition, when the load level is updated by the network monitoring unit, the control unit may transmit the alarm information stored in the storage unit to the server according to the updated load level and alarm level.

  Further, the control unit may transmit the stored alarm information to the server based on a transmission procedure corresponding to the load level and the alarm level.

  The monitored control apparatus may include an operation unit that receives a setting instruction from the user, and the transmission procedure may be set based on the setting instruction from the user.

  The monitored control device includes a capacity monitoring unit that monitors the capacity of the stored alarm information and notifies the control unit when the capacity exceeds a predetermined threshold. Based on the notification, the alarm information may be transmitted in an integrated manner, and the alarm information transmitted in an integrated manner may be deleted.

  The monitoring control system of the present invention is a monitoring control system having a plurality of monitored control devices and a server for monitoring and controlling the plurality of monitored control devices, and the server transmits a generated command to the monitored control device A transmission unit, a reception unit that receives a response from the monitored control device with respect to the command, a network monitoring unit that measures a response time from when the command is transmitted to when the response is received, and monitors a congestion state of the network, And a control unit configured to perform settings for the monitored control device so that information on a failure that has occurred in the monitored control device according to the congestion state of the network is transmitted to the server as alarm information.

  In addition, the server has influence information related to other monitored control devices that are affected by the failure, and the control unit sets the setting for avoiding the influence due to the failure based on the alarm information and the influence information. You may perform with respect to a control apparatus.

  The monitored control device of the present invention is a monitored control device of a monitoring control system that monitors and controls by a server, and includes a transmitting unit that transmits a command generated to the server, and a receiving unit that receives a response from the server to the command And a network monitoring unit that measures the response time from sending a command to receiving a response and monitoring the congestion state of the network, monitors the fault that occurs in itself, and uses the information on the fault that occurred as alarm information as a network And a control unit that controls transmission to the server in accordance with the congestion state.

  The server of the present invention is a server of a monitoring control system that monitors and controls a plurality of monitored control devices, a transmission unit that transmits a command generated to the monitored control device, and a response from the monitored control device to the command Occurred in the monitored control device according to the network congestion state, the network monitoring unit that measures the response time from sending the command to receiving the response and monitoring the network congestion state And a control unit configured to perform setting for the monitored control device to transmit the failure information to the server as alarm information.

  ADVANTAGE OF THE INVENTION According to this invention, the congestion of a network can be suppressed and the alarm information of the failure which generate | occur | produced in the to-be-monitored control apparatus can be transmitted / received without loss.

The block diagram which shows the structure of the monitoring control system 100 which concerns on one Embodiment of this invention. The block diagram which shows the structure of the to-be-monitored control apparatus 1 and the server 2 of one Embodiment. Flowchart of monitoring control processing by the monitoring control system 100 according to one embodiment The block diagram which shows the structure of the to-be-monitored control apparatus 1 and server 2 of other embodiment. Flow chart of monitoring control processing by the monitoring control system 100 according to another embodiment when the load level of the network 3 increases. Flow chart of monitoring control processing by the monitoring control system 100 according to another embodiment when the load level of the network 3 decreases. Flowchart of processing operation of monitored control apparatus 1 of other embodiment The block diagram which shows the structure of the monitoring control system 200 which concerns on the modification of other embodiment of this invention. Diagram showing an example of impact information data

<< Description of One Embodiment >>
FIG. 1 is a block diagram showing a configuration of a monitoring control system 100 according to an embodiment of the present invention.

  A monitoring control system 100 according to the present embodiment includes monitored control devices 1a and 1b and a server 2 that monitors and controls the monitored control devices, and is connected to each other via a network 3 so as to be able to transmit information to each other.

  The monitored control devices 1 a and 1 b are network devices such as a data server and a router that operate by being connected to the network 3. As shown in FIG. 2A, the monitored control devices 1a and 1b include a transmission unit 10, a reception unit 11, a network monitoring unit 12, a control unit 13, a storage unit 14, and a capacity monitoring unit 15, and a bus 16 is provided. It is connected so as to be able to communicate information.

  Based on the control instruction of the control unit 13, the transmission unit 10 transmits the generated command, alarm information about a failure that has occurred in the own device, and the like to the server 2. In this embodiment, the transmission unit 10 transmits a PING command as a generated command to the server 2 at a predetermined time interval so that the network monitoring unit 12 described later monitors the congestion state of the network 3. Note that other commands such as traceroute may be used instead of the PING command.

  The receiving unit 11 receives a response signal from the server 2 to the command transmitted by the transmitting unit 10 together with a control signal and data from the server 2.

  The network monitoring unit 12 monitors the congestion state of the network 3. Specifically, the network monitoring unit 12 measures the time until the transmission unit 10 transmits a PING command to the server 2 and the reception unit 11 receives the response signal. The network monitoring unit 12 calculates the average response time based on the response time measurement for the latest N PING command transmissions (N = 2 or more natural number). At the same time, the network monitoring unit 12 calculates the average arrival probability by obtaining the number of times the receiving unit 11 has received the response signal from the server 2. For example, when the receiving unit 11 receives a response signal from the server 2 four times for N = 5 PING command transmissions, the average arrival probability is 90%. The network monitoring unit 12 determines a load level indicating the degree of congestion in the network 3 from the average response time and the average arrival probability based on the load table.

  Here, the load table of the present embodiment is a list of load level definitions. In this embodiment, the load level has three stages of 1 to 3, and the case where the average response time is 20 milliseconds or less and the average arrival probability is 90% or more is 50 to a load level 1 and the average response time is longer than 20 milliseconds. A load level 2 is defined when the average arrival probability is 50% or less and less than 90%, and a load level 3 is defined when the latest response time is longer than 50 milliseconds and the latest arrival probability is less than 50%. The load table is stored in the storage unit 14. The definition of the load level and the number of levels are preferably determined as appropriate according to the configuration of the monitored control device 1 of the monitoring control system 100.

  The control unit 13 is a processor that comprehensively controls each unit of the monitored control device 1a or 1b. For example, the control unit 13 monitors a failure occurring in the monitored control device 1 based on a control program stored in the storage unit 14 and transmits alarm information of the failure to the server 2 according to the load level. Or stored in the storage unit 14. For example, when the load level is low, the control unit 13 transmits all alarm information to the server 2. On the other hand, when the load level is high, the control unit 13 transmits critical alarm information to the server 2 and stores minor alarm information in the storage unit 14.

  Moreover, the control part 13 transmits the alarm information memorize | stored in the memory | storage part 14 to the server 2 based on the transmission procedure according to a load level and an alarm level. The transmission procedure according to the load level and the alarm level is determined by appropriately selecting or combining known methods. Known methods include, for example, strict priority that is transmitted based on priority levels such as alarm levels, round robin that transmits a predetermined number of alarm information of each alarm level, weighted round robin, and the like. Which method is used is determined based on a setting instruction from the user.

  The storage unit 14 is formed from a hard disk, a semiconductor memory, or the like, and stores a control program executed by the control unit 13, a load table, alarm information, an occurrence time thereof, and the like. Furthermore, the storage unit 14 of the present embodiment also stores an alarm table. The alarm table is a table in which alarm information of a failure that has occurred in the monitored control device 1 is listed by level according to the magnitude of the influence of the failure. In the present embodiment, the alarm information is divided into three levels of alarm levels 1 to 3. Note that the number of alarm levels, alarm information included in each alarm level, and the like are appropriately determined according to the configuration of the monitored control device 1 and the like.

  The capacity monitoring unit 15 performs monitoring based on the number of alarm information stored in the storage unit 14. The capacity monitoring unit 15 determines that the alarm information stored in the storage unit 14 is overflowed and notifies the control unit 13 when the number of alarm information exceeds the threshold value α. The control unit 13 supervises the stored alarm information and transmits it to the server 2. The control unit 13 deletes the transmitted alarm information from the storage unit 14. The threshold value α is appropriately changed based on a setting instruction from the user.

  Next, the server 2 of this embodiment will be described. FIG. 2B is a block diagram illustrating a configuration of the server 2 of the present embodiment. The server 2 receives alarm information from each monitored control device 1 via the network 3 and monitors and controls each monitored control device 1. The server 2 can be a general computer. As shown in FIG. 2B, the server 2 includes a transmission unit 20, a reception unit 21, an input / output interface (input / output IF) 22, and a control unit 23, and is connected to be able to transmit information via a bus 26. . Furthermore, an input device 24 such as a keyboard and a pointing device and an output device 25 such as a monitor are connected to the server 2 via an input / output IF 22. The input / output IF 22 receives various inputs from the input device 24 and outputs display data to the output device 25.

  The transmission unit 20 transmits the generated command and data to the monitored control device 1 based on the control instruction of the control unit 23, the instruction received by the input device 24, and the like. Further, when the receiving unit 21 receives a PING command or the like from the monitored control device 1, the transmitting unit 20 transmits a response signal.

  The receiving unit 21 receives data, alarm information, a PING command, and the like from the monitored control device 1.

  The control unit 23 is a processor that comprehensively controls the operation of each unit of the server 2. The control unit 23 monitors and controls the monitored control device 1 by executing the monitoring control program.

  Next, monitoring control processing by the monitoring control system 100 of the present embodiment will be described with reference to the flowchart of FIG. In the following, processing between the monitored control device 1a and the server 2 will be described as an example, but similar processing is performed between the monitored control device 1b and the server 2. In addition, the network monitoring unit 12 of the monitored control devices 1a and 1b according to the present embodiment preliminarily averages response times <ta> and <tb> and average arrival probabilities <Pa> and <Pb> for N times PING command transmission. It is assumed that each has

  Step S10: The transmission unit 10 transmits the generated PING command to the server 2 based on the control instruction of the control unit 13.

  Step S11: The network monitoring unit 12 determines whether or not the receiving unit 11 has received a response signal from the server 2 with respect to the transmitted PING command. When the receiving unit 11 receives the response signal, the network monitoring unit 12 measures the response time for the transmitted PING command. For example, the network monitoring unit 12 calculates and updates the average response time <ta> and the average arrival probability <Pa> with respect to transmission of N PING commands including the current response time.

  On the other hand, when the receiving unit 11 cannot receive the response signal, the network monitoring unit 12 makes the response time indefinite. For example, the network monitoring unit 12 calculates and updates the average response time <ta> and the average arrival probability <Pa> for (N-1) PING command transmissions that do not include the current time.

  Step S12: The network monitoring unit 12 determines the load level of the network 3 from the calculated average response time <ta> and average arrival probability <Pa> based on the load table.

  Step S13: The control unit 13 determines whether or not a failure has occurred in its own monitored control apparatus 1a. When a failure occurs in the monitored control apparatus 1a, the control unit 13 acquires the occurrence time and proceeds to step S17 (YES side). If no failure has occurred, the control unit 13 proceeds to step S14 (NO side).

  Step S14: The control unit 13 determines whether or not the load level determined in step S12 has been updated compared to the previous load level. When the load level is updated, the control unit 13 proceeds to step S15 (YES side). On the other hand, if not updated, the control unit 13 proceeds to step S10 (NO side), and causes the transmission unit 10 to transmit the next PING command to the server 2.

  Step S15: The control unit 13 determines whether or not the notification level is equal to or higher than the load level. Here, the notification level is a degree of giving priority to transmitting the alarm information to the server 2 rather than storing it in the storage unit 14, and the alarm level and the following formulas (1) to (3) are set according to the notification setting. As related.

Notification level = alarm level (default) ... (1)
Notification level = alarm level + 1 (load priority) (2)
Notification level = alarm level-1 (notification priority) (3)
There are three notification settings in the present embodiment: default, load priority, and notification priority. In the expression (1), the notification setting is a normal setting by default. Expression (2) is a setting in which priority is given to storing the alarm information in the storage unit 14 in order to reduce the load on the network 3 when the notification setting is load priority. Formula (3) is a setting that gives priority to sending alarm information to the server 2 when the notification setting is notification priority. The monitored control device 1a is set to one of notification settings based on a user setting instruction. The number of notification settings and the relationship between the notification level and the alarm level are preferably determined as appropriate according to the configuration of the monitoring control system 100 and the monitored control device 1.

  And when a notification level is more than a load level, the control part 13 transfers to step S16 (YES side). When the notification level is lower than the load level, the process proceeds to step S10 (NO side), and the transmission unit 10 is caused to transmit the next PING command to the server 2.

  Step S16: The control unit 13 causes the transmission unit 10 to transmit the stored alarm information to the server 2 together with the occurrence time based on a transmission procedure according to the load level and the alarm level. The control unit 13 proceeds to step S <b> 10 and causes the transmission unit 10 to transmit the next PING command to the server 2.

  Step S17: The control unit 13 generates alarm information for the fault that has occurred. For example, in the case of a failure related to opening / closing of port 1 of the monitored control device 1a, the control unit 13 generates a port 1 open alarm or a port 1 blockage alarm, and the cooling fan 1 of the monitored control device 1a stops. , Generate a fan 1 failure alarm. The control unit 13 classifies and sets the generated alarm information based on the alarm table. That is, for example, in the case of a minor failure such as a port 1 open alarm or a port 1 blockage alarm, the control unit 13 sets the alarm level 1 or 2 based on the alarm table. On the other hand, in the case of a serious failure such as a fan 1 failure alarm. The control unit 13 sets the alarm level 3 based on the alarm table.

  Step S18: The control unit 13 calculates a notification level based on the notification setting and the expressions (1) to (3), and determines whether the notification level is equal to or higher than the load level. When the notification level is equal to or higher than the load level, the control unit 13 proceeds to step S19 (YES side). When the notification level is lower than the load level, the process proceeds to step S20 (NO side).

  Step S19: The control unit 13 transmits alarm information to the transmission unit 10 together with the occurrence time to the server 2 or stores it in the storage unit 14 according to the load level. For example, when the load level is 1, the control unit 13 transmits all the alarm information having the alarm levels 1 to 3 to the server 2. When the load level is 2, the control unit 13 transmits the alarm information with the alarm levels 2 and 3, and stores the alarm information with the information level 1 in the storage unit 14. The control unit 13 ends the series of processes.

  Step S20: The capacity monitoring unit 15 determines whether or not the number of alarm information stored in the storage unit 14 is greater than or equal to the threshold value α. When the number of alarm information is greater than or equal to the threshold value α, the capacity monitoring unit 15 notifies the control unit 13 to that effect. If the control part 13 receives the notification to that effect, it will transfer to step S22 (YES side). On the other hand, when the number of alarm information is less than the threshold value α, the control unit 13 proceeds to step S21 (NO side).

  Step S21: The control unit 13 stores the alarm information in the storage unit 14 and ends the series of processes.

  Step S22: The control unit 13 superimposes a plurality of stored alarm information and occurrence times and transmits them to the server 2. For example, the monitored control device 1a includes (1) port 1 open alarm, (2) port 2 block alarm, (3) port 1 block alarm, (4) fan 1 failure alarm, Assume that seven alarm information of 5) port 1 setting change alarm, (6) port 2 setting change alarm, and (7) port 4 open alarm are stored. Each alarm information of 1, 2, 3, and 7 is alarm information related to opening / closing of a port. The control unit 13 generates a single integrated alarm as “(1, 2, 3, 7) port open / close alarm”. Similarly, each of the alarm information items 5 and 6 is alarm information related to a setting change. The control unit 13 generates a single integrated alarm as “(5, 6) port setting change alarm”. In addition, the control unit 13 generates a general alarm that is integrated into “(4) Fan 1 failure alarm” itself. The control unit 13 causes the transmission unit 10 to transmit the three integrated alarms generated to the server 2. The control unit 13 deletes the seven alarm information and the occurrence time transmitted as the general alarm from the storage unit 14 and stores the current alarm information and the occurrence time in the storage unit 14. The control unit 13 ends the series of processes.

  Thus, in the present embodiment, the monitored control device 1 itself monitors the congestion state of the network 3 and controls the transmission of alarm information according to the congestion state, thereby suppressing the congestion of the network 3 and providing an alarm. Information can be sent and received without loss.

  Further, the monitored control device 1 transmits alarm information to the server 2 or stores it in the storage unit 14 based on the transmission procedure according to the load level and the alarm level, and refrains from transmitting alarm information with low importance. Thus, congestion of the network 3 can be avoided.

In addition, the monitored control device 1 transmits the alarm information stored in the storage unit 14 in a unified manner when the capacity of the alarm information exceeds a threshold value α. Can be avoided.
<< Description of Other Embodiments >>
A monitoring control system according to another embodiment of the present invention has the same configuration as that of the monitoring control system 100 according to one embodiment. A monitoring control system 100 according to one embodiment of FIG. 1 will be described as a monitoring control system according to this embodiment.

  FIG. 4 shows a block diagram of each of (a) the monitored control device 1 and (b) the server 2 constituting the monitoring control system 100 according to the present embodiment. In addition, in each of the monitored control device 1 and the server 2 of the present embodiment, those that perform the same operations as those of the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  The monitoring control system 100 of this embodiment is different from that of the first embodiment in that 1) a network monitoring unit 27 that monitors the congestion state of the network 3 is arranged in the server 2 and 2) the control unit 23 A polling signal is generated as a command for controlling the monitoring control device 1, and the transmission unit 20 is sequentially transmitted to the monitored control devices 1a-1e. The network monitoring unit 27 measures the time until the response signal to the polling signal is received as the response time, and calculates the average response time. 3) The network monitoring unit 27 uses only the average response time without using the load table. The load level is determined based on When the load level is updated, the server 2 sends a load level update notification to the monitored control device 1.

  Next, referring to the flowcharts of FIGS. 5 and 6, regarding the monitoring control processing by the monitoring control system 100 according to the present embodiment, A) when the load level of the network 3 increases, and B) when the load level of the network 3 decreases. Each will be described.

In the following, processing between the server 2 and the monitored control device 1a will be described as an example, but similar processing is performed between the server 2 and the monitored control device 1b. In the present embodiment, the network monitoring unit 27 of the server 2 has the average response times <ta> and <tb> of the monitored control devices 1a and 1b obtained in advance based on N polling signal transmissions. Further, the network monitoring unit 27 calculates and holds the threshold value Ths = β × <ta>. Here, β is an arbitrary value such as 2 as a threshold coefficient, and is set according to the configuration of the monitoring control system 100, the processing capability of the server 2, and the like.
A) When the load level of the network 3 increases Step S30: The transmission unit 20 transmits a polling signal to the monitored control device 1a based on the control instruction of the control unit 23.

  Step S31: The network monitoring unit 27 determines whether or not the receiving unit 21 has received a response signal from the monitored control device 1a with respect to the transmitted polling signal. When the reception unit 21 receives the response signal, the network monitoring unit 27 measures a response time t with respect to the transmitted polling signal. On the other hand, when the receiving unit 21 cannot receive the response signal, the network monitoring unit 27 makes the response time indefinite.

  Step S32: The network monitoring unit 27 determines whether or not the measured response time t is smaller than the threshold Ths. When the response time t is smaller than the threshold Ths, the network monitoring unit 27 determines that the network 3 is not in a congestion state, and proceeds to step S33 (YES side). On the other hand, when the response time t is equal to or greater than the threshold Ths or the response time t is indefinite, the network monitoring unit 27 determines that the network 3 is in a congestion state, and proceeds to step S35 (NO side).

  Step S33: The network monitoring unit 27 calculates and updates the average response time <ta> including the current response time t using the previous average response time <ta> 'as in the following equation (4).

<Ta> = (<ta> ′ × (N−1) + t) / N (4)
In addition, the network monitoring unit 27 calculates and updates the threshold Ths by multiplying the average response time <ta> obtained by Expression (4) by the threshold coefficient β.

  Step S34: The network monitoring unit 27 resets the parameter g that counts the number of times of determining the congestion state to 0. The initial value of parameter g is 0.

  Step S35: The network monitoring unit 27 holds the average response time <ta> and the threshold Ths without updating them. The network monitoring unit 27 updates the parameter g by adding 1.

  Step S36: The network monitoring unit 27 determines whether or not the parameter g is equal to or greater than a predetermined value G. If the parameter g is greater than or equal to the predetermined value G, the network monitoring unit 27 proceeds to step S37 (YES side). On the other hand, when the parameter g is smaller than the predetermined value G, the network monitoring unit 27 proceeds to step S30 (NO side), and the transmission unit 20 controls the next polling signal to be monitored according to the control instruction of the control unit 23. Send to device 1a. The predetermined value G is an arbitrary value such as 5, and is preferably set according to the configuration of the monitoring control system 100, the processing capability of the server 2, and the like.

Step S37: The network monitoring unit 27 determines that the network 3 is in a congestion state, and increases the load level by one. The network monitoring unit 27 sets the parameter g = G. The control unit 23 notifies the monitored control devices 1a and 1b of the load level update. The monitored control devices 1a and 1b receive and set the load level update notification. The control unit 23 ends the series of processes.
B) When the load level of the network 3 decreases Step S40: The transmission unit 20 transmits a polling signal to the monitored control device 1a based on the control instruction of the control unit 23. It is assumed that the parameter g = G is set.

  Step S41: The network monitoring unit 27 determines whether or not the receiving unit 21 has received a response signal from the monitored control device 1a with respect to the transmitted polling signal. When the reception unit 21 receives the response signal, the network monitoring unit 27 measures a response time t with respect to the transmitted polling signal. On the other hand, when the receiving unit 21 cannot receive the response signal, the network monitoring unit 27 makes the response time indefinite.

  Step S42: The network monitoring unit 27 determines whether or not the measured response time t is smaller than the threshold Ths. When the response time t is smaller than the threshold Ths, the network monitoring unit 27 determines that the network 3 is not in a congestion state, and proceeds to step S45 (YES side). On the other hand, when the response time t is equal to or greater than the threshold Ths or the response time t is indefinite, the network monitoring unit 27 determines that the network 3 is in a congestion state, and proceeds to step S45 (NO side).

  Step S43: The network monitoring unit 27 calculates and updates the average response time <ta> including the current response time t and the threshold Ths using the equation (4).

  Step S44: The network monitoring unit 27 resets the parameter g to a predetermined value G.

  Step S45: The network monitoring unit 27 holds the average response time <ta> and the threshold Ths without updating them. The network monitoring unit 27 updates the parameter g by subtracting one.

  Step S46: The network monitoring unit 27 determines whether the parameter g is 0 or less. When the parameter g is 0 or less, the network monitoring unit 27 proceeds to step S47 (YES side). On the other hand, if the parameter g is greater than 0, the network monitoring unit 27 proceeds to step S40 (NO side), and the transmission unit 20 sends the next polling signal to the monitored control device 1a according to the control instruction of the control unit 23. Send to.

  Step S47: The network monitoring unit 27 determines that the network 3 has solved the congestion state, and lowers the load level by one. The network monitoring unit 27 sets the parameter g = 0. The control unit 23 notifies the monitored control devices 1a and 1b of the load level update. The monitored control devices 1a and 1b receive and set the load level update notification. The control unit 23 ends the series of processes.

  Next, the processing operation of the monitored control apparatuses 1a and 1b that have received the load level update notification from the server 2 in the case of A or B will be described with reference to the flowchart of FIG. In the following description, processing between the monitored control device 1a and the server 2 will be described as an example, but similar processing is performed between the monitored control device 1b and the server 2.

  Step S50: The control unit 13 determines whether or not the receiving unit 11 has received a load level update notification from the server 2. When the load level update notification is received, the control unit 13 proceeds to step S51 (YES side). On the other hand, when not receiving, the control part 13 transfers to step S52 (NO side).

  Step S51: The control unit 13 updates and sets the load level.

  In addition, since the process of the following step S52-step S61 is the same as step S13-step S22 of one Embodiment shown in FIG. 3, detailed description is abbreviate | omitted.

As described above, in this embodiment, the server 2 monitors the congestion state of the network 3, sets the notification of the congestion state to the monitored control device 1, and the monitored control device 1 sets the alarm information according to the congestion state. By controlling the transmission, congestion of the network 3 can be suppressed and alarm information can be transmitted and received without loss.
<< Description of Modifications of Other Embodiments >>
FIG. 8 is a block diagram showing a configuration of a monitoring control system 200 as a modified example of the monitoring control system 100 according to another embodiment of the present invention.

  In the monitoring control system 200 according to the present embodiment, components that perform the same operations as the components of the monitoring control system 100 according to other embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. The configurations of the monitored control apparatuses 1a to 1e and the server 2 are the same as those of the other embodiments shown in FIG.

  The difference between the monitoring control system 200 of the present embodiment and the monitoring control system 100 of the other embodiments is that the server 2 is affected by the failure when a failure occurs in any of the monitored control devices 1a to 1e. The other monitored control devices 1a to 1e to be received have the influence information data listed according to the alarm level in a storage unit (not shown) (FIG. 9). FIG. 9 shows an example of the influence information data. That is, as shown in FIG. 9, when a failure occurs in each of the monitored control devices 1a to 1e shown in the first column, the influence information data is transmitted / received to / from the server 2 according to the alarm level of the failure. Other monitored control devices 1 that are affected are shown in the second to fourth columns, respectively. In addition, the server 2 of this embodiment presupposes having also the alarm table which each monitored control apparatus 1a-1e has in a memory | storage part (not shown).

  Thereby, for example, when a failure occurs in the monitored control device 1a, the receiving unit 21 of the server 2 receives the alarm information from the monitored control device 1a. The control unit 23 determines the alarm level of the received alarm information based on the alarm table. Based on the influence information data, the control unit 23 identifies another monitored control apparatus 1 that is affected by the transmission of the alarm information to the server 2 due to the failure that has occurred in the monitored control apparatus 1a. The control unit 23 temporarily sets other specified monitored control devices 1 to avoid the influence (for example, to cause other monitored control devices 1 to postpone transmission of alarm information). To increase the load level). When the monitored control device 1a recovers from the failure, the control unit 23 returns the original setting to the other monitored control devices 1.

  As described above, in this embodiment, the server 2 monitors the congestion state of the network 3, sets the notification of the congestion state to the monitored control device 1, and the monitored control device 1 sets the alarm information according to the congestion state. By controlling the transmission, congestion of the network 3 can be suppressed and alarm information can be transmitted and received without loss.

In addition, when a failure occurs in one monitored control device 1, the server 2 makes a setting for avoiding the influence on the other monitored control devices 1 affected by the failure, thereby further improving the effect. Network congestion can be suppressed.
<< Additional items of embodiment >>
(1) In the above embodiment, the monitored control device 1 or the server 2 monitors the congestion state of the network 3, but the present invention is not limited to this, and both the monitored control device 1 and the server 2 are connected to the network 3. The congestion state may be monitored. Thereby, congestion of the network 3 can be suppressed more efficiently and alarm information can be reliably transmitted and received without loss.

  (2) In the above embodiment, various setting changes are performed based on setting instructions from the user. The setting instruction from the user is, for example, a command line interface such as a keyboard connected to the monitored control device 1. (CLI), SNMP (Simple Network Management Protocol) of the server 2, or a WEB base is preferable. Thereby, the setting and change according to a use and an environment are attained.

  (3) In the above embodiment, the capacity monitoring unit 15 monitors the capacity of the storage unit 14 based on the number of alarm information. However, the present invention is not limited to this, and monitoring may be performed based on the storage capacity of alarm information. Good.

  (4) In the one embodiment, the network monitoring unit 12 determines the load level of the network 3 from the calculated average response time and average arrival probability based on the load table, but the present invention is not limited to this. For example, the network monitoring unit 12 calculates an average response time <ta> and an average arrival probability <Pa> for transmission of N PING commands including the current response time, and at the same time includes the latest response time including the current response time. The most recent response time ta and arrival probability Pa for M (<N) transmissions of the PING command are calculated. The network monitoring unit 12 determines the load level of the network 3 based on the comparison between the average response time <ta> and the latest response time ta and the comparison between the average arrival probability <Pa> and the latest arrival probability Pa. May be.

  (5) In the other embodiment described above, the control unit 23 generates a polling signal as a command for controlling the monitored control device 1, but the present invention is not limited to this, and a general control command is generated and monitored. You may transmit to the control apparatus 1.

  (6) In the other embodiments described above, the network monitoring unit 27 monitors the congestion state of the network 3 based only on the average response time, but the present invention is not limited to this. For example, the network monitoring unit 27 may monitor the congestion state of the network 3 based on the average arrival probability together with the average response time.

  From the above detailed description, features and advantages of the embodiments will become apparent. It is intended that the scope of the claims extend to the features and advantages of the embodiments as described above without departing from the spirit and scope of the right. Further, any person having ordinary knowledge in the technical field should be able to easily come up with any improvements and modifications, and there is no intention to limit the scope of the embodiments having the invention to those described above. It is also possible to use appropriate improvements and equivalents within the scope disclosed in.

1a to 1e Monitored control device, 2 servers, 3 networks, 10, 20 transmission unit, 11, 21 reception unit, 12, 27 network monitoring unit, 13, 23 control unit, 14 storage unit, 15 capacity monitoring unit, 22 input Output IF, 24 input device, 25 output device, 100, 200 Monitoring and control system

Claims (13)

A monitoring control system having a plurality of monitored control devices and a server for monitoring and controlling the plurality of monitored control devices,
The monitored control device includes:
A transmission unit for transmitting the generated command to the server;
A receiving unit for receiving a response from the server to the command;
A network monitoring unit that measures a response time from when the command is transmitted to when the response is received and monitors a congestion state of the network;
A monitoring control system comprising: a control unit that monitors a failure that occurs in itself and that controls transmission of the failure that has occurred to alarm information to the server according to a congestion state of the network. The monitoring control system according to claim 1,
The network monitoring unit determines a load level indicating a degree of congestion of the network based on the response time;
The control unit transmits the alarm information to the server according to the load level. The monitoring control system according to claim 1,
The network monitoring unit calculates a response probability that a response from the server to the command is received, determines a load level indicating a degree of congestion of the network based on the response time and the response probability,
The control unit transmits the alarm information to the server according to the load level. In the supervisory control system according to claim 2 or claim 3,
The control unit sets an alarm level indicating a degree of importance of the alarm information, and transmits the alarm information to the server according to the load level and the alarm level. The supervisory control system according to claim 4,
The monitored control device includes a storage unit,
The control unit stores the alarm information in the storage unit in response to transmission of the alarm information to the server according to the load level and the alarm level. The supervisory control system according to claim 5, wherein
When the load level is updated by the network monitoring unit, the control unit transmits the alarm information stored in the storage unit to the server according to the updated load level and the alarm level. Monitoring control system. In the supervisory control system according to claim 5 or 6,
The control unit transmits the stored alarm information to the server based on a transmission procedure according to the load level and the alarm level. The supervisory control system according to claim 7,
The monitored control device includes an operation unit that receives a setting instruction from a user,
The monitoring control system, wherein the transmission procedure is set based on a setting instruction from the user. The supervisory control system according to any one of claims 5 to 8,
The monitored control device includes a capacity monitoring unit that monitors the capacity of the stored alarm information, and notifies the control unit when the capacity exceeds a predetermined threshold,
The said control part transmits the said alarm information collectively based on the said notification from the said capacity | capacitance monitoring part, and deletes the said alarm information transmitted collectively. The monitoring control system characterized by the above-mentioned. A monitoring control system having a plurality of monitored control devices and a server for monitoring and controlling the plurality of monitored control devices,
The server
A transmission unit for transmitting the generated command to the monitored control device;
A receiving unit for receiving a response from the monitored control device to the command;
A network monitoring unit that measures a response time from when the command is transmitted to when the response is received and monitors a congestion state of the network;
A control unit configured to perform setting for the monitored control device to transmit information on a failure that has occurred in the monitored control device to the server as alarm information according to a congestion state of the network. And supervisory control system. The supervisory control system according to claim 10,
The server has influence information related to the other monitored control apparatus affected by the failure,
The said control part performs the setting for avoiding the influence by the said fault with respect to the said other monitored control apparatus based on the said alarm information and the said influence information. The monitoring control system characterized by the above-mentioned. A monitored control device of a monitoring control system that monitors and controls by a server,
A transmission unit for transmitting the generated command to the server;
A receiving unit for receiving a response from the server to the command;
A network monitoring unit that measures a response time from when the command is transmitted to when the response is received and monitors a congestion state of the network;
A control unit that monitors a failure that occurs in itself, controls transmission to the server according to a congestion state of the network as information on the failure that has occurred, and alarm information;
A monitored control apparatus comprising: A monitoring control system server that monitors and controls a plurality of monitored control devices,
A transmission unit for transmitting the generated command to the monitored control device;
A receiving unit for receiving a response from the monitored control device to the command;
A network monitoring unit that measures a response time from when the command is transmitted to when the response is received and monitors a congestion state of the network;
A control unit that performs setting for the monitored control device to transmit information on a failure that has occurred in the monitored control device to the server as alarm information according to a congestion state of the network;
A server comprising:

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