JP6920835B2 - Equipment monitoring device - Google Patents

Description

The present invention relates to an equipment monitoring device used in a monitoring system that collects state information from a plurality of equipments.

Conventionally, a monitoring system that collects contact information and analog pulse information from a plurality of facilities has been known. In this monitoring system, the monitoring information is acquired only when there is a change in the monitoring information collected from the monitored device. This makes it possible to accurately grasp the state of the monitored device without increasing the capacity of the data packet transmitted to the monitoring server. (See, for example, Patent Document 1).

JP-A-2009-105809

In the conventional monitoring system, the presence or absence of a change in the state of the equipment is collected by the equipment monitoring device, and the equipment information of the changed equipment is notified from the equipment monitoring device to the monitoring server via the network. Therefore, if the status change notification is lost due to network congestion or the processing load of the monitoring server, the monitoring server cannot correctly grasp the equipment status.

For example, taking the monitoring system of FIG. 1 of Patent Document 1 as an example, when there are three monitored devices (hereinafter, equipment A, equipment B, equipment C), the state of each equipment at a certain timing T1, T2, T3. Is in the state shown in FIG. When the initial state is turned on, the presence or absence of a state change for each equipment at each timing is as shown in FIG. It is assumed that among the status change notifications transmitted from the field monitoring device 4 to the monitoring server 2 at each timing, the one transmitted at the timing T2 disappears for some reason. At this time, since the monitoring server 2 does not update the equipment state, the states of the equipment B and the equipment C are different from the actual state at the timing T2 as shown in FIG. After that, when the monitoring server 2 receives the state change notification transmitted from the field monitoring device at the timing T3, the states of the equipment A and the equipment B are updated, but the state of the equipment C remains ON. In this way, if the status change notification is lost in the network and the equipment status change is not notified correctly, the monitoring server keeps track of it until the next status change occurs in any of equipment A, equipment B, and equipment C. There is a discrepancy between the equipment condition and the actual equipment condition. The present invention has been made to solve the above problems, and an object of the present invention is to allow a monitoring server to correctly grasp the state of a plurality of facilities even in an environment where data packets may be lost.

The equipment monitoring device of the present invention newly stores the equipment status acquisition unit that periodically collects the equipment status information, the equipment status storage unit that continuously stores the equipment status information collected by the equipment status acquisition unit, and the equipment status storage unit. By comparing the first state information that has been generated with the second state information stored before the first state information, only the state information in which the state of the equipment has changed is transmitted to the monitoring server. A state information transmission unit that transmits all the status information of the equipment stored in the equipment status storage unit to the monitoring server is provided separately from the notification timing of the status change notification transmission unit. The transmission timing is characterized after the state change notification transmission unit transmits the state information of the reference number of times.

According to the equipment monitoring device of the present invention, even if the monitoring server misses the status change notification for some reason, the status information transmission unit transmits the status information of all the equipment at another timing, so that the monitoring server is the equipment. The state can be grasped accurately.

It is a block diagram of the conventional equipment monitoring system. It is a figure which shows the equipment state at a predetermined timing of the equipment monitoring system of FIG. It is a figure which shows the presence or absence of the state change at a predetermined timing of the equipment monitoring system of FIG. It is a figure which shows the equipment state which the monitoring server grasps at a predetermined timing of the equipment monitoring system of FIG. It is a block diagram of the equipment monitoring system according to Embodiment 1 of this invention. It is a hardware block diagram of the equipment monitoring apparatus according to Embodiment 1 of this invention. It is a functional block diagram of the equipment monitoring apparatus according to Embodiment 1 of this invention. It is a flowchart which shows the operation of the equipment state acquisition part by Embodiment 1 of this invention. It is a figure which shows the equipment state which is stored in the equipment state storage part by Embodiment 1 of this invention. It is a flowchart which shows the operation of the state change notification transmission part by Embodiment 1 of this invention. FIG. 5 is a diagram showing a state change notification represented by an operation of a state change notification transmitting unit in the equipment state shown in FIG. It is a flowchart which shows the operation of the network quality measurement part by Embodiment 1 of this invention. It is a figure which shows the detection time and the retransmission or transmission event of the retransmission or transmission packet recorded in the network quality information storage unit by the operation of the network quality measurement unit of FIG. It is a figure which shows the detection time and RTT recorded in the network quality information storage part by the operation of the network quality measurement part of FIG. It is a flowchart which shows the operation of the state information transmission part by Embodiment 1 of this invention. It is a figure which shows an example of the parameter set in the state information transmission part by Embodiment 1 of this invention. It is a functional block diagram of the equipment monitoring apparatus according to Embodiment 2 of this invention. It is a flowchart which shows the operation of the state change notification transmission part by Embodiment 2 of this invention.

Embodiment 1
FIG. 5 shows an example of a monitoring system 1 using the equipment monitoring device 11 according to the first embodiment of the present invention. A plurality of equipments 10a, 10b, and 10c are connected to the equipment monitoring device 11. Further, the equipment monitoring device 11 is connected to the monitoring server 13 via a network 12 such as a LAN (Local Area Network) or the Internet.

FIG. 6 shows an example of the hardware configuration of the equipment monitoring device 11 of the first embodiment. The equipment monitoring device 11 is a CPU 22 (Central Processing) that executes a program.
It includes a Unit), a RAM 23 (Random Access Memory) connected to the CPU 22 by a bus 26, a network interface 24, an equipment interface 25, and a magnetic disk device 21. Instead of the magnetic disk device 21, a storage device such as a flash memory or a memory card reading / writing device may be provided. The RAM 23 is an example of a volatile memory, and the magnetic disk device 21 is an example of a non-volatile memory. The OS (Operating System) 210, the program 211, and the file 212 are stored in the magnetic disk device 21, and the CPU 22 reads and executes them when the device is started. The network interface 24 is connected to the network 12 and communicates with the monitoring server 13. The equipment interface 25 is connected to the equipment 10a, 10b, and 10c via CC-Link, RS-422, RS-232C, contacts, and the like, and receives equipment status information. The same interface may be used for the network interface 24 and the equipment interface 25.

FIG. 7 shows a functional block diagram of the equipment monitoring device 11 of the first embodiment. The equipment state acquisition unit 30 acquires the equipment state from the equipment via the equipment interface 25. The equipment state storage unit 31 stores the equipment state information acquired by the equipment state acquisition unit 30 for two times, the new state and the old state. The state change notification transmission unit 32 compares the new state and the old state stored in the equipment state storage unit 31 with each other, detects the change in the state, and notifies the monitoring server 13 via the network interface 24. The network quality measurement unit 33 monitors the communication packets sent and received by the network interface 24 to measure the network quality. The work memory 36 holds a communication packet for the network quality measuring unit 33 to measure the network quality. The network quality information storage unit 34 stores the network quality information measured by the network quality measurement unit 33. The status information transmission unit 35 transmits the status information stored in the equipment status storage unit 31 to the monitoring server 13 a predetermined number of times by the status change notification transmission unit 32 via the network interface 24. Send to 13.

Next, the state information acquisition operation of the equipment monitoring device 11 of the first embodiment configured as described above will be described for each functional block.
First, the operation of the equipment state acquisition unit 30 will be described with reference to FIG. The equipment state acquisition unit 30 repeats the operations of steps 1 to 5 described below at predetermined time intervals for collecting equipment state information.
Step 1: The state information saved as the new state information in the equipment state storage unit 31 is saved as the old state information (overwrites the old state area) (S1 in FIG. 8).
Step 2: Using the equipment interface 25, state information is sequentially collected from the equipments 10a, 10b, and 10c (S2).
Step 3: After collecting the status information of the equipments 10a, 10b, and 10c, the process proceeds to step 4 (S3).
Step 4: The collected state information of the equipment 10a, 10b, and 10c is stored in the equipment state storage unit 31 as new state information (overwrites in the new state area) (S4).
Step 5: Notify the state change notification transmitting unit 32 that the state information of the equipment state storage unit 31 has been updated (S5).
Here, as an example, it is assumed that the equipment state storage unit 31 becomes as shown in FIG. 9 after collecting the equipment state.

Next, the operation of the state change notification transmission unit 32 will be described with reference to FIG. Upon receiving the notification from the equipment status acquisition unit 30, the status change notification transmission unit 32 performs the operations of steps 101 to 106 described below.
Step 101: Acquire the new state information and the old state information of the equipment whose state has not been compared yet from the equipment state storage unit 31 (S101 in FIG. 10).
Step 102: Check if there is a difference between the acquired old and new status information. If there is a difference, the process proceeds to step 103, and if there is no difference, the process proceeds to step 104 (S102).
Step 103: New status information of the equipment having a difference is added to the status change notification, and the process proceeds to step 104 (S103).
Step 104: Steps 101 to 103 are repeated until the old and new state information of all the equipments are compared. After comparing the old and new status information of all the equipment, the process proceeds to step 105 (S104).
Step 105: The state change notification created by the operation of step 101 to 103 is transmitted to the monitoring server 13 (S105).
Step 106: The count value of the number of times the state change notification is transmitted, which is held inside the state change notification transmission unit 32, is increased by 1 (S106). If the above operation is performed when the equipment state storage unit 31 is in the state shown in FIG. 9, the state change notification is as shown in FIG.

Next, the operation of the network quality measuring unit 33 will be described with reference to FIG. The network quality measurement unit 33 constantly monitors the communication packet flowing through the network interface 24, and performs the operations of steps 201 to 208 described below each time the communication packet is detected.
Step 201: The IP header and TCP header of the detected communication packet are extracted (S201 in FIG. 12).
Step 202: If the detected communication packet is a communication packet transmitted by the equipment monitoring device 11, the process proceeds to step 203, and if the detected communication packet is a communication packet (received packet) received by the equipment monitoring device 11, the process proceeds to step 206 (S202).
Step 203: If the detected communication packet is a retransmitted communication packet (retransmission packet), the process proceeds to step 204, and if not, the process proceeds to step 205. If a packet having the same destination / source IP address in the IP header of the detected communication packet, the destination / source port number in the TCP header, and the sequence number exists in the work memory 36, it is determined to be a retransmission packet (S203). ..

Step 204: The detection time of the retransmission packet and the occurrence of the retransmission event are recorded in the network quality information storage unit 34 in the form shown in FIG. 13, for example, and the process proceeds to step 208 (S204).
Step 205: The detection time of the transmission packet other than the retransmission packet and the occurrence of the transmission event are recorded in the network quality information storage unit 34 in the form shown in FIG. 13, for example, and the process proceeds to step 208 (S205).
Step 206: If the received packet is a response packet, the process proceeds to step 207, and if not, the process proceeds to step 208 (S206). If the work memory 36 has a transmission packet having a sequence number of ACK number -1 of the detected received packet, it is determined that it is a response packet to this transmission packet.
Step 207: The round-trip delay time RTT (Round Trip Time) is calculated by taking the time difference between the detection times of the transmission packet and the response packet, and is recorded in the network quality information storage unit 34 in the form shown in FIG. 14, for example (S207). ..
Step 208: The detection time, IP header information, and TCP header information of the detected communication packet are stored in the work memory 36 (S208). At this time, if the stored information exceeds the predetermined capacity of the work memory 36, the information of the oldest communication packet in the work memory 36 is deleted.

Next, the operation of the state information transmission unit 35 will be described with reference to FIG. For the operation of the state information transmission unit 35, as shown as an example in FIG. 16, a plurality of preset parameters are used as threshold values. Other parameters may be used depending on the equipment to be monitored, the characteristics of the network 12, and the like. The state information transmission unit 35 performs the operations of steps 301 to 307 described below at 1-second intervals.
Step 301: If the count value of the number of times the state change notification is transmitted by the state change notification transmission unit 32 is equal to or greater than the threshold value (30 times in the present embodiment), the process proceeds to step 304, otherwise the process proceeds to step 302 (the process proceeds to step 302). S301 in FIG. 15).
Step 302: If the state information non-transmission time held inside the state information transmission unit 35 is equal to or longer than the threshold value (1800 seconds in the present embodiment), the process proceeds to step 304, otherwise the process proceeds to step 303. (S302).
Step 303: The state information non-transmission time is increased by 1 second, and the operation is terminated (S303).
Step 304: With reference to the network quality information storage unit 34, the predicted packet loss rate and the predicted RTT representing the network quality are calculated. The predicted packet loss rate is extracted from the detection time stored in the network quality information storage unit 34 and the transmission or retransmission event information in which the time is included in 10 minutes before and after the current time (the target time is the current day). Not limited to those included in the 10 minutes before and after the same time as the current time of the past date), it is calculated by the following formula.
(Predicted packet loss rate) [%] = (Number of retransmission information) * 100 / (Number of transmission information)
The predicted RTT is the average value of the RTT information stored in the network quality information storage unit 34 whose time is included in 10 minutes before and after the current time (the target time is not limited to the current day but the current time of a past date). The ones included in 10 minutes before and after the same time as the above are also extracted).

Step 305: When the predicted packet loss rate is equal to or less than the threshold value (0.5% in the present embodiment) and the predicted RTT is equal to or less than the threshold value (300 ms in the present embodiment), the network quality is equal to or higher than the threshold value. Is determined, and the process proceeds to step 306. If not, the process ends (S305).
Step 306: The new state information stored in the equipment state storage unit 31 is transmitted to the monitoring server 13 (S306).
Step 307: The number of times the state change notification is transmitted held in the state change notification transmitting unit 32 is reset to 0, and the state information non-transmission time held internally is reset to 0 seconds (S307).

As described above, the equipment monitoring device 11 according to the present embodiment provides information on the total status of the equipment at the timing when the status of the equipment 10a, 10b, 10c to be monitored changes a certain number of times and when the network quality is equal to or higher than a certain level. Is transmitted to the monitoring server 13. As a result, even if the monitoring server 13 misses the state change notification transmitted from the equipment monitoring device 11 each time the state changes, the monitoring server 13 can correctly grasp the state information.

Embodiment 2
FIG. 17 shows a functional block diagram of the equipment monitoring device 11a according to the second embodiment of the present invention. The same reference numerals as those in FIG. 7 indicate the same functions, and thus the description thereof will be omitted. The equipment monitoring device 11a according to the second embodiment has a hash value calculation unit 37 that calculates a hash value of state information stored in the equipment state storage unit 31, and a state information request receiving unit that receives a state information request from the monitoring server 13. It is newly equipped with 38.

The operation of the state change notification transmission unit 32a and the hash value calculation unit 37 will be described with reference to FIG. Step 401 and step 402 are newly added to the operation of the state change notification transmission unit 32 in the first embodiment described with reference to FIG.
Step 401: The hash value calculation unit 37 calculates the hash value of this data by regarding the entire new state information stored in the equipment state storage unit 31 as one binary data. The hash value is calculated using a general algorithm such as MD5 (Message Digist Algorithm 5) or SHA (Secure Hash Algorithm) (S401 in FIG. 18).
Step 402: The hash value calculated in step 401 is added to the state change notification (S402).

The monitoring server 13 compares the hash value included in the status change notification received from the equipment monitoring device 11a with the hash value calculated by the same method from the equipment status information held by the monitoring server 13 to perform the equipment. You can know if you can grasp the state correctly. When the calculated hash value and the received hash value are different, the monitoring server 13 transmits a status information request to the equipment monitoring device 11a.

When the state information request receiving unit 38 receives the state information request from the monitoring server 13, the state information transmitting unit 35a is used to transmit the new state information stored in the equipment state storage unit 31 to the monitoring server 13.

As described above, the equipment monitoring device 11a according to the second embodiment transmits the state change notification including the hash value of the equipment state. The monitoring server 13 is in a state held by itself by comparing the hash value calculated by the same method with respect to the state information held by itself with the hash value transmitted from the equipment monitoring device 11a. You can judge whether the information is correct. Since the correctness can be verified without transmitting the status information itself, the amount of communication data can be suppressed. Furthermore, since all the status information is transmitted to the monitoring server 13 when the status information is incorrect, there is no need to set various thresholds to manage the transmission of all status information, and the network quality measurement unit 33 and the work memory 36 do not need to be managed. , The network quality information storage unit 34 becomes unnecessary, and the device can be simplified.

In the present invention, each embodiment can be freely combined, and each embodiment can be appropriately modified or omitted within the scope of the invention. Further, in the figure, the same reference numerals indicate parts having the same or corresponding configurations and functions.

10a, 10b, 10c: equipment, 11, 11a: equipment monitoring device,
3, 12: Network, 2, 13: Monitoring server, 21: Magnetic disk device,
210: OS, 211: Program, 212: File, 22: CPU,
23: RAM, 24: network interface,
25: Equipment interface, 26: Bus, 30: Equipment status acquisition department,
31: Equipment status storage unit, 32, 32a: Status change notification transmission unit,
33: Network quality measurement unit, 34: Network quality information storage unit,
35, 35a: Status information transmission unit, 36: Working memory, 37: Hash value calculation unit,
38: Status information request receiver

Claims (4)

The equipment status acquisition unit that periodically collects the equipment status information, the equipment status storage unit that continuously stores the equipment status information collected by the equipment status acquisition unit, and the newly stored first status information. , The state change notification transmission unit that transmits only the state information in which the state of the equipment has changed by comparing with the second state information stored before the first state information to the monitoring server, and the state change notification. Separately from the notification timing of the transmission unit, a status information transmission unit that transmits all the status information of the equipment stored in the equipment status storage unit to the monitoring server is provided .
The equipment monitoring device , characterized in that the transmission timing of the state information transmitting unit is after the state change notification transmitting unit has transmitted the state information of a reference number of times. The network quality information is provided with a network quality measurement unit that measures the round-trip delay time and the number of retransmissions in communication with the monitoring server, and a network quality information storage unit that stores the network quality information measured by the network quality measurement unit. If network quality calculated from network quality information stored in the storage unit does not satisfy the reference value, the equipment monitoring device according to claim 1, wherein the state information transmitting unit is characterized in that does not transmit status information .. A claim comprising a hash value calculation unit for calculating a hash value of state information stored in the equipment state storage unit, and the state change notification transmission unit transmitting the hash value together with the state information. The equipment monitoring device according to 1. The claim is characterized in that the transmission timing of the state information transmitting unit is a time when a state information request from the monitoring server is received when the transmitted hash value and the hash value calculated by the monitoring server are different. The equipment monitoring device according to 3.

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