JP4851961B2 - Observation station, monitoring control system, monitoring control controller, communication control device, and LAN switch device - Google Patents

Description

  The present invention relates to a plurality of communication control devices that communicate monitoring control information with corresponding monitoring control objects, a LAN switch device having a LAN port corresponding to each communication control device, the plurality of communication control devices, and the LAN switch device. The present invention relates to an observation station, a monitoring control system, a monitoring control controller for the observation station, a communication control device for the observation station, and a LAN switch device for the observation station.

In the supervisory control system, data transmission for supervisory control has conventionally been realized by a communication method such as CDT (Cyclic Data Transmission) or HDLC (High-Level Data Link Control) using an analog line. .
On the other hand, recently, devices compatible with IP (Internet Protocol) have become widespread, and therefore, data transmission systems are being made IP in surveillance control systems. For example, Patent Document 1 shows a configuration in which a secondary adjustment device, an excitation control device, a governor control device, and other devices are connected by a LAN (Local Area Network) as a control device for a hydroelectric power plant. . In the example of Patent Document 1, each device is connected to a LAN by a transceiver, but recent LANs are often configured by high-function and high-performance relay devices such as LAN switches and routers.

JP-A-9-305206 (FIG. 1 and its description)

FIG. 12 shows a configuration example of a monitoring control system in which an existing device to be monitored that has been applied by an analog line is accommodated in an IP network. In the monitoring control system, a plurality of observation stations 1a, 1b,... 1n are connected to the monitoring station 2 via an IP network 4 as shown in the figure.
FIG. 12 is a diagram illustrating an example in which a high-performance and high-performance relay device such as a LAN switch or a router in a recent general LAN is applied instead of the transceiver in Patent Document 1.

  As shown in the figure, the observation station 1a includes a LAN switch 11, a supervisory controller 12, a plurality of communication control devices 13a, 13b,... 13n, and a plurality of existing devices (the secondary adjustment device, .. 14n, a plurality of analog lines 15a, 15b,... 15n, and a router 3.

  The observation stations 1a, 1b,... 1n have the same internal configuration as the observation station 1a, but are not shown.

  The monitoring station 2 includes a monitoring control server 21 and a router 3 as shown in the figure.

The observation stations 1 a, 1 b,... 1 n and the monitoring station 2 are connected to the IP network 4 via the router 3.
The monitoring control server 21 of the monitoring station 2 performs the 1: N communication with the plurality of observation stations 1a, 1b,... 1n to monitor the monitoring target data of each of the observation stations 1a, 1b,. And monitoring outputs of the observation stations 1a, 1b,... 1n, and control outputs as necessary.

The existing devices 14a, 14b,... 14n to be monitored and controlled are connected to the communication control devices 13a, 13b by the communication procedure such as the CDT or HDLC via the analog lines 15a, 15b,. ,... 13n are connected to the existing devices 14a, 14b,... 14n, and data transmission is performed between the communication control devices 13a, 13b,.
The communication control devices 13a, 13b,... 13n and the monitoring control controller 12 are LAN-connected by a LAN switch 11.

Data such as status information captured by the existing devices 14a, 14b,... 14n is distributed to the monitoring control controller 12 by these connection configurations, and data processed by the monitoring control controller 12 is transmitted from the router 3. Collected via the router 3 via the IP network 4 to the monitoring control server 21.
When the existing devices 14a, 14b,... 14n need to be controlled, a control instruction output is transmitted from the monitoring control server 21 to the monitoring control controller 12, and the corresponding communication from the monitoring control controller 12 is performed. The control instruction output reaches the corresponding existing devices 14a, 14b,... 14n via the control devices 13a, 13b,. The corresponding existing devices 14a, 14b,... 14n perform processing according to the control instruction output.

When a device constituting the system fails, it is necessary to make it possible for the monitoring control server to confirm that a failure has occurred in order to take a recovery procedure as soon as possible. Therefore, LAN communication is performed between the two devices for monitoring whether the devices are operating normally by the following method.
In addition to the normal data transmission procedure, monitoring packets are transmitted and received at regular intervals (hereinafter this communication is referred to as health check). If there is no response within a certain time, it is assumed that an abnormality has occurred in the counterpart device, and the corresponding abnormality process is performed.

  If the period of the health check is made too short, not only will the communication load on the LAN increase, but the processing load on the device will also increase, causing problems in system performance. Therefore, it is necessary to set the period of the health check to a somewhat long period, and it is set to a period of several tens of seconds to about 1 minute. On the other hand, taking a longer health check cycle means that the time required from the occurrence of an abnormality of the monitoring target device to the detection of the abnormality becomes longer, which is a problem in a monitoring control system that requires real-time processing. As described above, in the conventional health check method using LAN communication, it takes time to detect the device abnormality. Therefore, the device abnormality is detected more than when the conventional health check method using LAN communication is applied to the monitoring control system. There is a problem that it is preferable to realize a method of shortening the time until the time.

  Also, in the monitoring control system, when performing maintenance work online, the line of the monitoring control target device may be disconnected or the device power may be turned off. In such a case, the monitoring control target device as described above is monitored. When the monitoring function to be operated is operated, there arises a problem that notification of occurrence / recovery of an abnormality is unnecessarily performed.

  In the monitoring control system as shown in FIG. 12, if the monitoring control controller or the LAN switch fails, communication between the monitoring station and the observation station becomes impossible. If communication is disabled during execution of remote control processing from the monitoring station, operation will continue without control until an abnormality is detected by the health check. There is also a problem that it is necessary to detect and automatically stop the control and recover to a safe state.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object thereof is to enable early detection of an abnormality in LAN communication even when an observation station data transmission system is configured by a LAN. It is.

Monitoring and control system according to the present invention, between the corresponding supervisory control and communication control unit for communicating monitoring control information, the communication control device and is perforated pre Symbol LAN port LAN port connected to the communication control device A monitoring device comprising: a LAN switch device that detects an abnormality of the link information; and a monitor controller that is connected to a LAN port of the LAN switch device and that is notified of the abnormality detection information of the link information detected by the LAN switch device. A control station and a monitoring control server connected to the monitoring control station via an IP network are provided .

The present invention, the link information between the corresponding supervisory control and communication control unit for communicating monitoring control information, the communication control device and is perforated pre Symbol LAN port LAN port connected to the communication control device abnormality A monitoring control station comprising: a LAN switch device that detects the error; a monitoring control controller that is connected to a LAN port of the LAN switch device and that is notified of abnormality detection information of the link information detected by the LAN switch device ; and Since the monitoring control server connected to the monitoring control station via the IP network is provided, it is possible to quickly detect the occurrence of an abnormality in the apparatus.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram illustrating the internal configuration of the monitoring control system and its LAN switch device, FIG. 2 is a diagram illustrating the internal operation of the LAN switch device, in particular, a fixed cycle start process for monitoring the LAN link status, and FIG. It is a figure which shows the example of the operation | movement sequence between each apparatus in the monitoring control system.

  First, the configuration of the LAN switch device 11 and the function of each part of the LAN switch device 11 according to Embodiment 1 of the present invention will be described with reference to FIG. Since the configuration other than the LAN switch device 11 is the same as that shown in FIG. 12, the description of the configuration and functions is omitted.

  As illustrated in FIG. 1, the LAN switch device 11 includes a microprocessor 111, a nonvolatile memory 112, a volatile memory 113, a switch controller 114, a plurality of LAN ports 115a, 115b,... 115m, 115n, and a dip. A switch 116 is provided.

  The microprocessor 111 is provided in the LAN switch device 11 (or attached to the LAN switch device 11), and is connected to the nonvolatile memory 112, the volatile memory 113, and the switch controller 114 via an internal bus 117. Yes. The microprocessor 111 holds a LAN communication function for the own LAN switch device, and holds the IP address and MAC address of the own LAN switch device in the nonvolatile memory 112.

  The non-volatile memory 112 records programs and various settings for the microprocessor 111. In addition, since the program stored in the nonvolatile memory 112 has a network protocol function, LAN communication with an external device is possible. Furthermore, a notification destination IP address for notification when abnormality is detected is set and stored in the nonvolatile memory 112 in advance.

  The switch controller 114 has a main function of the LAN switch device 11. In addition, the switch controller 114 is connected to the LAN ports 115b,... 115m, 115n and the communication control devices 13a of the corresponding devices 14a,. -The link state of whether or not 13n is electrically connected is maintained. The link state is displayed to the outside by turning on / off the LED, and can be referred to from the microprocessor 111. The volatile memory 113 stores the link state.

  The plurality of LAN ports 115a, 115b,... 115m, 115n are connected to the switch controller 114, respectively.

  In FIG. 1, among the many connection lines, the LAN line is indicated by a bold line.

In FIG. 1, the observation station 1 a includes a monitoring control controller 12 that performs monitoring control by communicating monitoring control information with a monitoring control target. The observation station 1a corresponds to the monitoring control station in the claims.
The observation stations 1b,..., 1n are the same as the observation station 1a although the internal configuration is not shown.

  In FIG. 1, a monitoring station 2 monitors and controls a plurality of observation stations 1a, 1b,.

  Next, the operation of the LAN switch device 11 will be described.

  In FIG. 1, the microprocessor 111 monitors the link state from the switch controller 114 at regular intervals. When the microprocessor 111 first refers to the link state from the switch controller 114, the microprocessor 111 stores the link state for each LAN port number of each of the LAN ports 115a, 115b,... 115m, 115n in the volatile memory 113. After that, this state is updated every time periodic monitoring is performed.

  When performing periodic monitoring with LAN communication, in order to suppress an increase in the LAN communication load and the processing load on the device, it was usually necessary to set the cycle to about once every several tens of seconds to several minutes. On the other hand, when the link state monitoring process is performed in the LAN switch device 11 as in the first embodiment, the influence on the system performance is small even with a period of about 1 second to several tens of milliseconds, and the connection is made. It is possible to quickly detect the occurrence of an abnormality in the link state with the device.

  Hereinafter, the fixed-cycle activation processing operation (step ST1) of LAN link state monitoring in the LAN switch device 11 will be described with reference to FIG. 2 which is a flowchart.

  First, the link state of each of the LAN ports 115a, 115b,... 115m, 115n is referred from the switch controller 114 (step ST1-1).

  Next, since the previous link state of each of the LAN ports 115a, 115b,... 115m, 115n is stored in the volatile memory 113, the stored previous link state and the current link state are determined as follows. Whether there is a state change, the previous link state and the current link state are compared (step ST1-2).

  As a result of the comparison in step ST1-2, if there is no state change (step ST1-3), the current link state is overwritten and saved in the volatile memory 113 (step ST1-5), and in step ST1-5 Is finished after the above-mentioned overwriting is saved (step ST1-6).

  If there is a state change as a result of the comparison in step ST1-2 (step ST1-3), the state change information is notified to a preset IP address of the corresponding device (step ST1-4). For this notification, UDP (User Datagram Protocol) or TCP (Transmission Control Protocol), which is a protocol stack on IP, is used.

  After the notification process in step ST1-4, the current link state is overwritten and saved in the volatile memory 113 (step ST1-5), as in the case of no change in the state described above. The process ends after the overwriting is saved (step ST1-6).

  Next, an operation sequence between the devices in the monitoring control system, particularly an example of an abnormality notification processing sequence in the case where an abnormality occurs in the communication control device 13 and LAN communication becomes impossible will be described with reference to FIG.

  The communication control device 13a can notify that the abnormality has occurred by LAN communication if it is a minor abnormality, but if a serious failure that prevents LAN communication has occurred (step ST3-1), The own apparatus is reset (step ST3-2) or stopped.

  On the other hand, in the LAN switch device 11, the link state is referred to the switch controller 114 from the microprocessor 111 of the LAN switch device 11 at a constant cycle as described with reference to FIG. Simultaneously with the reset of the communication control device 13a, the LAN port 115a of the LAN switch device 11 connected to the communication control device 13a is in a link-disconnected state (step ST3-3).

  At the time of referring to the link state immediately after the LAN port 115a is in a link disconnection state in step ST3-3, the microprocessor 111 of the LAN switch device 11 detects the occurrence of link abnormality (step ST3-4) and immediately observes it. A link abnormality occurrence notification (step ST3-5) is transmitted to the monitoring controller 12 of the station 1a.

  When the monitoring controller 12 of the observation station 1a receives this link abnormality occurrence notification, it transfers this link abnormality occurrence notification to the monitoring control server 21 of the monitoring station 2 (ST3-6).

  Similarly to the communication control device 13a, the communication control device 13b (not shown),... 13n, when a serious failure that prevents LAN communication occurs, monitors and controls the corresponding observation stations 1b,. The controller receives the link abnormality occurrence notification and forwards the link abnormality occurrence notification to the monitoring control server 21 of the monitoring station 2.

  Even when the link abnormality is recovered, the monitoring controller of the corresponding observation station receives the link abnormality recovery notification by the function equivalent to that when the link abnormality occurs, and the monitoring control server 21 of the monitoring station 2 Forward link error recovery notification.

  As described above, in the first embodiment of the present invention, the LAN switch device 11 includes the link state monitoring function that uses the link state information of the monitoring target obtained through each LAN port linked to each monitoring target. The link status monitoring function is used to monitor the link status of the monitoring target with the LAN switch device 11 and immediately notify the monitoring station monitoring control server 21 of the link abnormality via the monitoring control controller 12 of the monitoring station when a link abnormality occurs. Therefore, failure of the communication control devices 13a,... 13n and other link abnormalities can be detected quickly.

Embodiment 2. FIG.
The second embodiment of the present invention will be described below with reference to FIG. 4 which illustrates the internal operation of the LAN switch device, particularly the fixed-cycle startup processing operation of LAN link status monitoring.

  As described above, according to the first embodiment of the present invention, it is possible to notify the monitoring station in real time from the LAN switch device that a link abnormality has occurred on the monitoring target side. The device connected to the notified LAN port because it is the port position information (number) of the LAN port of the LAN switch device corresponding to the monitored device in which the abnormality occurred, not the information of the failed monitored device itself It is necessary to check the connection diagram separately or go directly to the site. In addition, since the same communication function can be realized regardless of the port position in the LAN switch device, it may be connected to a port different from the initial connection position after operation and maintenance work.

  On the other hand, the second embodiment of the present invention provides a means for easily specifying the monitoring target device connected to each LAN port.

  Some LAN switch devices generally have a function of automatically learning a MAC address from a transmitted packet for each LAN port and holding it in an address table in order to realize a filtering function. This function is implemented in the switch controller. By referring to this address table when necessary from the microprocessor of the LAN switch device, it is possible to link a specific port and address information of the device connected to the port.

In FIG. 4, processing different from that of the first embodiment of the present invention described above is shown by a thick frame. It is assumed that this process is started at a fixed period as in the first embodiment of the present invention described above.
The processing when there is no state change in the link state (step ST1-3) is the same as that in the first embodiment of the present invention described above.

  If the link state is changed (step ST1-3), the microprocessor 111 refers to the address table from the switch controller 114 for the LAN port where the link state has changed, and The MAC address information is acquired (step ST1-34). The microprocessor 111 that has acquired the MAC address information, when notifying the link state change information (step ST1-4), adds the MAC address to the port location information of the LAN port corresponding to the monitored device that has changed state. Information is added and both pieces of information are transmitted to the supervisory controller 12.

  Since the supervisory controller 12 is in LAN communication with the communication control devices 13a,... 13n before the occurrence of the link state abnormality, the association information of the MAC address and the IP address is stored in the ARP (Address Resolution Protocol) table. keeping. By referring to this ARP table, the microprocessor 111 converts the MAC address information of the communication control device of the monitoring target device received from the LAN switch device 11 into a corresponding IP address. The microprocessor 111 adds the converted IP address information to the received information and transmits it to the monitoring control server 21 of the monitoring station 2.

  By doing so, the monitoring control server 21 of the monitoring station 2 can identify the communication control device 13 in the disconnected state from the converted IP address information.

  As described above, in the second embodiment of the present invention, when sending a notice of abnormality of the link state with the LAN port of the LAN switch device of the communication control device to be monitored and controlled, the LAN switch device uses the port of the LAN port. It is configured to add the MAC address information of the communication control device of the corresponding monitoring target device to the position information, and the monitoring control controller adds the IP address information corresponding to the corresponding MAC address to the port position information of the LAN port. Since it is configured, the monitoring station can easily identify the communication control device in the disconnected state from the IP address, and can easily handle maintenance work.

Embodiment 3 FIG.
The second embodiment of the present invention will be described below with reference to FIG. 5, which illustrates the internal operation of the LAN switch device, in particular, the periodic start processing operation of LAN link status monitoring.

  According to the first and second embodiments of the present invention described above, the monitoring station 2 can be notified in real time that an abnormality has occurred in the link between the monitoring target device and the LAN port of the LAN switch device. In some cases, the line of an arbitrary device may be disconnected or the power of the device may be turned off. Is performed continuously. Since the monitoring station 2 may be inconvenient due to the fact that unnecessary abnormal information that is not normal operation remains as a history, it is desirable not to notify unnecessary abnormality during maintenance work.

  Therefore, in the third embodiment of the present invention, one of the dip switches (DIP switch (Dual In-line Package switch)) of the LAN switch device is assigned to mode switching during operation / maintenance.

  In FIG. 5, processing different from those in the first and second embodiments is indicated by a thick frame. It is assumed that this process is started at a fixed period as in the first and second embodiments.

  In FIG. 5, when the fixed cycle activation process is activated (step ST1), the mode switching dip switch state is first referred to (step ST1-01).

  When the mode switching setting is in operation of the monitoring control system and the monitoring target device, the processing of steps ST1-1 to ST1-6 is performed similarly to the flowchart of FIG.

  If the mode switching setting is during maintenance of the monitoring control system and the monitoring target device, one process is terminated (ST1-6).

  As described above, since the mode switching setting is referred to at the head of the fixed-cycle startup process, it is possible to switch from online operation to maintenance without resetting the LAN switch device, and no abnormality notification is performed from the time the switch is switched. Can be. In addition, since the LAN link state remains the state at the time immediately before switching during maintenance, the LAN link state monitoring process can be resumed from the state immediately before switching when returning from maintenance to operation.

  As described above, in the third embodiment of the present invention, one of the dip switches of the LAN switch device is assigned to mode switching, and the mode switching setting is referred to at the head of the LAN link state monitoring fixed period startup process. Maintenance work can be performed online without sending unnecessary abnormality notifications to the monitoring station.

Embodiment 4 FIG.
A fourth embodiment of the present invention will be described below with reference to FIGS. FIG. 6 is a diagram showing an example of a notification destination IP address table of the LAN switch device, FIG. 7 is a diagram illustrating an internal operation of the LAN switch device, in particular, a periodic cycle start processing operation of LAN link status monitoring, and FIG. It is an abnormality notification processing sequence diagram when a failure occurs in the supervisory controller 12 and LAN communication becomes impossible.

  In the first to third embodiments described above, it is assumed that the communication control devices 13a,... 13n have a failure or a link failure.

  Even when the supervisory controller 12 falls into a failure state in which LAN communication is impossible, from the supervisory control server 21, control of the communication controllers 13a,. If communication is disabled during execution of remote control processing from the monitoring control server 21 to the communication control devices 13a,... 13n, control is disabled, and in order to prevent this, the communication control devices 13a,. It is necessary to detect an abnormality at 13n, automatically stop the control, and recover to a safe state.

  Therefore, in the fourth embodiment, a notification destination IP address table capable of setting a notification destination for each LAN port number in which an abnormality has occurred is provided in the nonvolatile memory 112 of the LAN switch device 11.

  As illustrated in FIG. 6, a notification destination IP address is set in advance for each LAN port in the notification destination IP address table.

  Also, here, for reference, a notification destination device, for example, all communication control devices, a supervisory control controller, and the like are described together.

  In this example, the supervisory controller 12 is connected to the LAN port # 1 (115a), and the communication controller 13 is connected to the other LAN ports # 2 (115b), # 3, # 4,. Assume that you are connected.

  In this example, the network address is 192.168.1.0/24, and the IP address of the supervisory controller 12 is 192.168.1.10.

  When an abnormality occurs in the link state of LAN port # 1 (115a) corresponding to the supervisory control controller 12, all communication control devices 13a,... 13n are notified, so that 192.168.1. .255 is set. When an abnormality occurs in the link state of the other LAN ports # 2 (115b), # 3, # 4,... #N corresponding to each monitored device, the same as in the first to third embodiments. Therefore, the address 192.168.1.10 of the supervisory controller 12 is set.

  In FIG. 7 which is a flowchart of the LAN link state monitoring fixed-cycle activation process in the fourth embodiment, processes different from those in the first to third embodiments are indicated by a thick frame. This processing is assumed to be started at regular intervals as in the first to third embodiments.

  In FIG. 7, the processing when the switching mode is under maintenance or when there is no change in the link state is the same as in the first to third embodiments.

  When the link state has changed (step ST1-3), the address information of the monitoring target devices connected to the LAN ports 115a, 115b,... 115m, 115n is referred to (step ST1-34). Next, the notification destination IP address table on the non-volatile memory 112 is referred to (step ST1-341), and the notification destination IP address corresponding to the corresponding LAN port (the LAN port whose link state has changed) is addressed. The state change information is notified (step ST1-342). Here, in the case of LAN port # 1 (115a), since the broadcast address 192.168.1.255 is set, all devices in the broadcast domain connected to the LAN switch device 11 (for example, all communication control devices 13a,...).・ It will be received in 13n).

  Next, in the abnormality notification processing sequence in FIG. 8 when a failure occurs in the supervisory controller 12 and LAN communication becomes impossible, the supervisory controller 12 indicates that an abnormality has occurred in its own device if it is a minor abnormality. However, if a serious failure that prevents LAN communication has occurred (step ST8-1), the device is reset or stopped (step ST8-2).

  In the LAN switch device 11, the LAN port 115a of the LAN switch device connected to this device (monitoring control controller 12) is in a disconnected state simultaneously with the reset of the monitoring controller 12 (step ST8-2) (step ST8). -3).

  When the link state is referred to by the microprocessor 111 of the LAN switch device 11 immediately after the LAN port 115a is in the link cut state, the microprocessor 111 detects the occurrence of a link abnormality (step ST8-4).

  Here, as shown in step ST1-341 in FIG. 7, when the notification destination IP address table is referred to, since the link abnormality is the LAN port 115a, the address is a broadcast address. -5) is broadcasted.

  On the other hand, the communication control devices 13a,... 13n are waiting to receive a specific UDP (User Datagram Protocol) port number in order to receive a notification from the LAN switch device 11 in advance. Upon receiving this notification, the communication control devices 13a,... 13n stop the control process and stop in a predetermined safe state. Since this notification is transmitted with a specific UDP port number as the destination, even if another device is connected in the broadcast domain, it is not received if the target UDP port is not opened.

  As described above, in the fourth embodiment of the present invention, even when the supervisory controller 12 falls into a failure state in which LAN communication is impossible, the notification destination IP address table is set in the LAN switch device, and the supervisory controller is connected. When an abnormality is detected in the LAN port to be transmitted, an abnormality notification is immediately transmitted by broadcast transmission. When the communication control device receives the broadcast notification on the left, the communication control device stops the control process and automatically enters a predetermined safe state. Since the apparatus is configured to stop, the system can be shifted to a safe state even if an abnormality occurs during remote control processing from the monitoring station.

Embodiment 5 FIG.
The fifth embodiment of the present invention will be described below with reference to FIGS. FIG. 9 is a diagram showing an example of the internal configuration of the monitoring control system, (a) is an overall view of the monitoring control system and its LAN switch device, (b) is a diagram showing an example of the internal configuration of the monitoring control controller, (C) is a figure which shows the example of the internal structure of a communication control apparatus. FIG. 10 is a flowchart illustrating the internal operation of the supervisory controller, particularly the LAN link state monitoring fixed period startup process of the supervisory controller. FIG. 11 is the internal operation of the communication controller, particularly the LAN link state monitor constant of the communication controller. It is a figure which illustrates a period starting process with a flowchart.

In the fifth embodiment, it is assumed that the LAN switch device 11 has failed and stopped. When the LAN switch device fails, communication between all devices connected to the LAN switch device becomes impossible, and control to the communication control device becomes impossible as assumed in the fourth embodiment.
If the LAN switch device fails, the notification cannot be transmitted from the LAN switch device as in the first to fourth embodiments.
In the fifth embodiment, such a problem is addressed, and the monitoring controller and the communication controller monitor the LAN link state from the LAN controller at regular intervals by the microprocessor, thereby detecting the failure of the LAN switch device. It is characterized by detecting in real time.

9A, 9B, and 9C, the monitoring controller 12 includes a microprocessor 111, a nonvolatile memory 112, a volatile memory 113, a LAN controller 121a, a LAN controller 121b, a LAN port 115a, and a LAN port 115b. ing.
Each of the communication control devices 13a,... 13n includes a microprocessor 111, a nonvolatile memory 112, a volatile memory 113, a LAN controller 121, and a LAN port 115.

  The microprocessor 111, the nonvolatile memory 112, the volatile memory 113, and the LAN ports 115-121, 15-122, and 115-13 in the monitoring controller 12 and the communication control devices 13a,. 1 has the same functions as the microprocessor 111, the nonvolatile memory 112, the volatile memory 113, and the LAN ports 115a, 115b,... 115m, 115n in FIG.

  Since the supervisory controller 12 is connected to both the LAN switch device 11 and the router 3, there are two LAN controllers and two LAN ports. However, the communication controllers 13a,... 13n are connected to the LAN switch device 11. There is one controller and one LAN port.

  In FIG. 9, among the many connection lines, the LAN line is indicated by a thick line.

  Next, the LAN link state monitoring fixed period startup process of the monitoring controller 12 will be described with reference to FIG.

In FIG. 10, as in the case of the fixed period startup process of the LAN switch device in the first embodiment, the link state of the LAN port is referred to (step ST1-1) and compared with the previous link state (step ST1-2). ).
When there is a state change (step ST1-3), processing according to the device type is performed (step ST1-3512). That is, it detects that an abnormality has occurred in the link state with the LAN switch device 11 and notifies the monitoring control server 21 of the monitoring station 2 via the IP network 4.

  Next, LAN link state monitoring fixed period startup processing of the communication control devices 13a,... 13n will be described with reference to FIG.

  In FIG. 11, as in the case of the fixed period startup process of the LAN switch device in the first embodiment, the link state of the LAN port is referred to (step ST1-1) and compared with the previous link state (step ST1-2). ).

  When there is a state change (step ST1-3), each communication control device 13a,... 13n is similar to the case where the link state abnormality notification is received from the LAN switch device 11 in the fourth embodiment. The control processing for the corresponding existing devices 14a,... 14n is stopped and stopped in a predetermined safe state.

  As described above, in the fifth embodiment, in the monitoring control controller and the communication control device, the microprocessor monitors the LAN link state from the LAN controller at regular intervals, so that the failure of the LAN switch device is real-time in each device. Therefore, even when the LAN switch device falls into a failure state in which LAN communication is impossible, the monitoring control server is notified, and the communication control device stops the control process and automatically sets a predetermined safety level. By operating so as to stop in a safe state, the system can be shifted to a safe state even if an abnormality occurs in the LAN switch device during the remote control processing from the monitoring control server.

  1 to 12, the same reference numerals indicate the same or corresponding parts.

  The first to fifth embodiments of the present invention conceptually have the following features as described above.

  Feature 1: A LAN switch device characterized in that, when the link state of a LAN port changes, the LAN port number information whose link state has changed is notified to a preset device by LAN communication; Monitoring control system configured to connect devices of observation stations to be monitored with a LAN switch, including a monitoring control controller device characterized by receiving notification of the above and performing processing according to the notification content It is.

  Feature point 2: When a change in the LAN link state is detected at feature point 1, the MAC address of the device connected to the LAN port is referenced from the address table managed in the own device, and connected together with the LAN port number information. The LAN switch device is characterized in that the MAC address information of the device that has been used is notified by LAN communication, and when the notification on the left is received, the MAC address is associated with the IP address by referring to the ARP table. In addition, the monitoring control controller device is characterized in that the IP address information is added to the received information and a notification is transmitted to the monitoring station via LAN.

  Feature point 3: A LAN switch characterized in that, in feature point 1 or feature point 2, the LAN switch is provided with a dip switch for operation / maintenance mode switching, and is configured not to detect a change in the LAN link state when the maintenance mode is set. apparatus.

  Feature point 4: In any one of feature point 1 to feature point 3, a notification destination IP address is set in advance when an abnormality occurs for each LAN port, and when a link state change occurs, a different device is notified depending on the LAN port. A LAN switch device that is configured to be able to perform communication, and a communication control device that is configured to stop control processing upon receipt of a notification from the LAN switch device and to wait in a predetermined state It is.

  Feature point 5: In any one of feature point 1 to feature point 4, when the link state of the LAN port connected to the LAN switch changes, the monitoring station is notified by LAN communication. A monitoring control controller device and a communication control device configured to stop control processing when the link state of a LAN port connected to a LAN switch changes and to wait in a predetermined state is there.

  Feature 6: Monitoring control controller and monitoring control LAN-connected via a LAN switch device having a plurality of communication control devices that communicate monitoring control information with the corresponding monitoring control objects and LAN ports corresponding to these communication control devices A server is connected via an IP network, and the LAN port of the LAN switch device and the corresponding communication via the IP network, the monitor control controller, the LAN, and the LAN switch device by the monitor control server A monitoring control method for monitoring a state of link information with a control device, wherein a microprocessor for detecting an abnormality in link information between each LAN port and the corresponding communication control device is provided in the LAN switch device. Each LAN port provided and generated by the microprocessor. And a monitor and control system abnormality detection information of the link information is transmitted to the monitor control server via the monitor controller and the IP network between its corresponding said communication control device.

  Feature point 7: A plurality of communication control devices that communicate corresponding monitoring control targets and monitoring control information, a LAN switch device having a LAN port corresponding to each communication control device, the plurality of communication control devices, and the LAN switch device A microprocessor for detecting a link information abnormality between each LAN port and the corresponding communication control device in the LAN switch device. The monitoring control system is configured to notify the monitoring control controller of the abnormality detection information of the link information between each LAN port generated by the microprocessor and the corresponding communication control device.

  Feature point 8: In the supervisory control system according to feature point 7, the LAN switch device has an address table for associating the MAC address of each communication control device with the LAN port number of each LAN port, The monitoring control system is characterized in that the MAC address of the corresponding communication control device, the LAN port number of the corresponding LAN port, and the abnormality detection information are associated based on the address table.

  Feature point 9: In the supervisory control system according to feature point 8, the supervisory control controller has an ARP table that associates the MAC address with an IP address, and the MAC address is based on the ARP table. A supervisory control system characterized by being converted to an address.

  Feature point 10: In the supervisory control system according to any one of feature points 7 to 9, when the LAN switch device includes a dip switch for operation / maintenance mode switching, and the dip switch is set to the operation mode. Is a monitoring control system in which the abnormality detection is performed and the abnormality detection is stopped when the DIP switch is set to the maintenance mode.

  Feature point 11: In the supervisory control system according to any one of feature points 7 to 10, when an abnormality of the supervisory controller is detected by link information between the LAN switch device and the supervisory controller, Abnormality detection information is notified to the communication control device corresponding to each LAN port, and the communication control device that has received the notification stops control processing for the corresponding monitoring control target and waits in a predetermined state. It is a supervisory control system.

  Feature point 12: In the supervisory control system according to any one of feature points 7 to 11, an abnormality of the LAN switch device is detected by the supervisory control controller based on link information between the LAN switch device and the supervisory control controller. When the abnormality of the LAN switch device is detected by the link information between the LAN switch device and each communication control device, the communication control device stops the control process for the correspondence monitoring control target and enters a predetermined state. A monitoring control system characterized by waiting.

  Feature point 13: The LAN switch device according to feature point 8, wherein the LAN switch device has an address table that associates the MAC address of each communication control device with the LAN port number of each LAN port. It is.

  Feature point 14: The supervisory control controller according to feature point 9, which has an ARP table for associating the MAC address with the IP address.

  Feature point 15: The communication control device according to feature point 11, wherein each communication control device stops control processing for the corresponding monitoring control target when an abnormality of the monitoring control controller is detected, and is in a predetermined state It is a communication control device that stands by.

  Feature point 15: The communication control device according to feature point 12, wherein when the abnormality of the LAN switch device is detected, each communication control device stops the control process for the corresponding monitoring control target, and is in a predetermined state. It is a communication control device that stands by.

  Feature 16: Since the LAN switch device has a link state monitoring function, and the device is configured to notify the monitoring control server via the monitoring control controller immediately when an error occurs or recovers, the communication control device Failure can be detected quickly.

  Feature 17: The LAN switch device is configured to add the MAC address information together with the port location information when sending the abnormality notification, and the monitoring controller is configured to add the IP address information corresponding to the MAC address. Therefore, it becomes possible to easily specify the communication control device in the communication disabled state by the monitoring station, and it becomes easy to cope with the maintenance work.

  Feature 18: One of the dip switches of the LAN switch device is assigned to the mode switching setting during operation / maintenance, and the link state is monitored only when it is in operation by referring to this mode switching setting As a result, unnecessary abnormality notifications are not transmitted to the monitoring station during the maintenance work, and the maintenance work can be performed online.

  Feature 19: Even if the supervisory control controller falls into a failure state that disables LAN communication, a notification destination IP address is set for each LAN port, and if an abnormality is detected in the LAN port to which the supervisory control controller is connected, it is broadcast immediately When the communication control device receives the broadcast notification shown on the left, the communication control device stops the control process and automatically keeps the device in a predetermined safe state. Even if an abnormality occurs during remote control processing from the system, the system can be shifted to a safe state.

  Feature 20: The monitoring controller and communication controller are configured so that the microprocessor monitors the LAN link status from the LAN controller at regular intervals, thereby detecting the failure of the LAN switch device in real time in each device. Therefore, even when the LAN switch device falls into a failure state in which LAN communication is impossible, the monitoring control server is notified, and the communication control device stops the control process and automatically maintains it in a predetermined safe state. Even if an abnormality occurs in the LAN switch device during the remote control processing from the monitoring station, the system can be shifted to a safe state.

  Feature 21: Even when an observation station data transmission system is configured with a LAN, it is possible to quickly detect the occurrence of an abnormality in LAN communication, and easily identify the monitoring and control target device that is in a communication-disabled state from the location where the abnormality in the LAN has been detected. In addition, it is possible to obtain a monitoring and control system with high maintainability and availability by preventing abnormality detection during online maintenance work, and abnormalities occur in the monitoring control controller and LAN switch device. Even if you do, you can automatically move the system to a safe state.

  Feature 22: A communication control device that communicates monitoring control information with a corresponding monitoring control target, and a LAN port to which the communication control device is connected, and an abnormality in link information between the LAN port and the communication control device And a monitoring control controller that is connected to a LAN port of the LAN switch device and that is notified of abnormality detection information of the link information detected by the LAN switch device.

  Feature point 23: The observation station according to feature point 22, wherein the LAN switch device has an address table that associates a LAN port number with a MAC address of the communication control device connected to the LAN port, It is an observation station that adds the MAC address of the communication control device connected to the LAN port that has detected an abnormality with reference to an address table to the abnormality detection information.

  Feature point 24: The observation station according to feature point 23, wherein the monitoring controller is an observation station having an ARP table that associates the MAC address and IP address of the communication control device.

  Feature point 25: The observation station according to any one of feature point 22 to feature point 24, wherein the LAN switch device operates in an operation mode for notifying the abnormality detection information and in a maintenance mode not informing the abnormality detection information. It is an observation station that operates by switching between.

  Feature point 26: the observation station according to any one of feature point 22 to feature point 25, wherein the LAN switch device detects an abnormality in link information between the LAN port and the monitoring controller. The communication control device is notified of the abnormality detection information, and the communication control device notified of the abnormality detection information stops the control process for the corresponding monitoring control target, and waits in a predetermined state. is there.

  Feature point 27: The observation station according to any one of feature point 22 to feature point 26, wherein the monitoring control controller detects an abnormality in link information between the LAN switch device and the monitoring control controller. It is an observation station.

  Feature point 28: The observation station according to any one of feature point 22 to feature point 27, wherein the communication control device detects an abnormality in link information between the LAN switch device and the communication control device. When an abnormality is detected, the monitoring station stops the control process for the corresponding monitoring control target and stands by in a predetermined state.

  Feature point 29: A monitoring control system comprising the observation station according to any one of feature point 22 to feature point 28, and a monitoring control server connected to the observation station via an IP network.

  Feature 30: A communication control device that communicates monitoring control information with a corresponding monitoring control target, and a monitoring control controller that connects to the LAN via the LAN switch device, and detects an abnormality in link information between the LAN switch device It is a supervisory control controller.

  Feature point 31 is a communication control device that communicates monitoring control information with a corresponding monitoring control object and performs monitoring control and a LAN connection via a LAN switch device, and the link between the LAN switch device When the information abnormality is detected and the abnormality is detected, the communication control device stops the control process for the corresponding monitoring control target and stands by in a predetermined state.

  Feature 32: Having a plurality of LAN ports, detecting an abnormality in link information with a device connected to the LAN port, and detecting an abnormality detection information when any abnormality is detected in any of the LAN ports A LAN switch device that notifies a device connected to the LAN port.

  Feature point 33: The LAN switch device according to feature point 32, comprising an address table associating a MAC address of a device connected to the LAN port with a LAN port number of the LAN port, and referring to the address table The LAN switch device adds the MAC address of the device connected to the LAN port where the abnormality is detected to the abnormality detection information.

It is a figure which shows the example of the internal structure of the monitoring control system illustrated in common with Embodiments 1-5 of this invention, and its LAN switch apparatus. FIG. 5 is a diagram illustrating the first embodiment of the present invention, and is a diagram illustrating the internal operation of the LAN switch device, in particular, the periodic cycle start processing operation of LAN link state monitoring, as a flowchart. FIG. 2 is a diagram illustrating the first embodiment of the present invention, and is a diagram illustrating an example of an operation sequence between devices in a monitoring control system, particularly an abnormality notification processing sequence when an abnormality occurs in a communication control device and LAN communication is disabled. is there. FIG. 7 is a diagram illustrating a second embodiment of the present invention, and is a diagram illustrating a internal operation of a LAN switch device, in particular, a periodic cycle start processing operation of LAN link state monitoring, as a flowchart. FIG. 9 is a diagram illustrating a third embodiment of the present invention, and is a diagram illustrating a flow chart illustrating an internal operation of a LAN switch device, in particular, a periodic start processing operation of LAN link state monitoring. It is a figure which shows Embodiment 4 of this invention, and is a figure which shows the example of the notification destination IP address table of a LAN switch apparatus. It is a figure which shows Embodiment 4 of this invention, and is a figure which illustrates the internal operation | movement of LAN switch apparatus, especially the fixed period starting process operation | movement of LAN link state monitoring. It is a figure which shows Embodiment 4 of this invention, It is a figure which shows the example of the operation | movement sequence between each apparatus in a monitoring control system, especially the example of the abnormality notification process sequence when abnormality occurs in the monitoring control controller and LAN communication becomes impossible. is there. It is a figure which shows Embodiment 5 of this invention, and is a figure which shows the example of a structure of a supervisory control system, The (a) is an overall view of a supervisory control system and its LAN switch apparatus, (b) is a supervisory control controller. The figure which shows the example of an internal structure, (c) is a figure which shows the example of the internal structure of a communication control apparatus. It is a figure which shows Embodiment 5 of this invention, and is a figure which illustrates the internal operation | movement of a monitoring control controller, especially the LAN link state monitoring fixed period starting process of a monitoring control controller by a flowchart. It is a figure which shows Embodiment 5 of this invention, and is a figure which illustrates the internal operation | movement of a communication control apparatus, especially the LAN link state monitoring fixed period starting process of a communication control apparatus with a flowchart. This is a diagram showing a configuration example of a supervisory control system that accommodates existing equipment that has been applied to an analog line in an IP network, and applies high-function, high-performance relay equipment such as LAN switch equipment and routers in recent general LANs. FIG.

Explanation of symbols

1a, 1b, ... 1n observation station,
2 monitoring stations,
3 routers,
4 IP network,
11 LAN switch device,
12 Supervisory controller
13a,... 13n communication control device,
14a,... 14n, existing devices that are monitoring and control targets,
15a, ... 15n analog line,
111 microprocessor,
112 non-volatile memory,
113 volatile memory,
114 switch controller,
115a, 115b, ... 115m, 115n LAN ports,
116 DIP switch,
121, 121a, 121b LAN controllers.

Claims (11)

A communication control unit for communicating the monitoring control information corresponding monitored and controlled, LAN to detect an abnormality of the link information between the communication controller have a LAN port for connecting the front Symbol LAN port and the communication control device A monitoring control station comprising: a switching device; and a monitoring control controller connected to a LAN port of the LAN switching device and notified of abnormality detection information of the link information detected by the LAN switching device ;
A supervisory control server connected to the supervisory control station via an IP network
Monitoring and control system equipped with . A communication control device that communicates monitoring control information with a corresponding monitoring control target, and a LAN switch that has a LAN port to which the communication control device is connected and detects an abnormality in link information between the LAN port and the communication control device A monitoring control station that is connected to a LAN port of the LAN switch device and is notified of abnormality detection information of the link information detected by the LAN switch device, and the monitoring control station and the IP a the supervisory control station in monitor control system having a monitor control server connected via a network,
The LAN switch device has an address table that associates a LAN port number with the MAC address of the communication control device connected to the LAN port, and connects to the LAN port that detects an abnormality with reference to the address table A monitoring control station, wherein a MAC address of the communication control device is added to the abnormality detection information. In the supervisory control station according to claim 2,
The monitoring control station, wherein the monitoring control controller has an ARP table that associates a MAC address and an IP address of the communication control device. In the supervisory control station according to claim 2 or claim 3 ,
The LAN switch device operates by switching between an operation mode that notifies the abnormality detection information and a maintenance mode that does not notify the abnormality detection information. In the supervisory control station according to any one of claims 2 to 4,
The LAN switch device detects an abnormality of link information between the LAN port and the monitoring controller, and notifies the communication control device of the abnormality detection information;
The communication control apparatus notified of the abnormality detection information stops the control process for the corresponding monitoring control target and stands by in a predetermined state. In the supervisory control station according to any one of claims 2 to 5,
The monitoring control station, wherein the monitoring control controller detects an abnormality of link information between the LAN switch device and the monitoring control controller. In the supervisory control station according to any one of claims 2 to 6,
The communication control device detects an abnormality in link information between the LAN switch device and the communication control device, and when an abnormality is detected, stops the control processing for the corresponding monitoring control target, and is determined in advance. A supervisory control station characterized by waiting in a state. A communication control device that communicates monitoring control information with a corresponding monitoring control target, and a LAN switch that has a LAN port to which the communication control device is connected and detects an abnormality in link information between the LAN port and the communication control device A monitoring control station comprising: a device; and a monitoring control controller connected to a LAN port of the LAN switch device and notified of abnormality detection information of the link information detected by the LAN switch device;
A supervisory control server connected to the supervisory control station via an IP network
The supervisory control controller in a supervisory control system comprising:
Ri Oh monitoring controller for LAN connected via the corresponding said supervisory control and the communication control apparatus for communicating the supervisory control information the LAN switch device,
A monitoring control controller for detecting an abnormality in link information with the LAN switch device. A communication control device that communicates monitoring control information with a corresponding monitoring control target, and a LAN switch that has a LAN port to which the communication control device is connected and detects an abnormality in link information between the LAN port and the communication control device A monitoring control station comprising: a device; and a monitoring control controller connected to a LAN port of the LAN switch device and notified of abnormality detection information of the link information detected by the LAN switch device;
A supervisory control server connected to the supervisory control station via an IP network
The communication control device in a monitoring control system comprising:
Communicating with the monitoring control object corresponding to the supervisory control information, Ri communication control apparatus der to LAN connected through to the monitoring controller that monitors control the LAN switch device,
Communication control characterized by detecting an abnormality in link information with the LAN switch device, and stopping the control processing for the corresponding monitoring control target and waiting in a predetermined state when the abnormality is detected apparatus. A communication control device that communicates monitoring control information with a corresponding monitoring control target, and a LAN switch that has a LAN port to which the communication control device is connected and detects an abnormality in link information between the LAN port and the communication control device A monitoring control station comprising: a device; and a monitoring control controller connected to a LAN port of the LAN switch device and notified of abnormality detection information of the link information detected by the LAN switch device;
A supervisory control server connected to the supervisory control station via an IP network
The LAN switch device in a monitoring control system comprising:
With multiple LAN ports,
An abnormality in link information with a device connected to the LAN port is detected, and when an abnormality is detected in any of the LAN ports, the abnormality detection information is notified to a device connected to the predetermined LAN port. A LAN switch device. In LAN switching device according to claim 1 0,
An address table associating a MAC address of a device connected to the LAN port with a LAN port number of the LAN port;
A LAN switch device characterized in that a MAC address of a device connected to the LAN port in which an abnormality is detected with reference to the address table is added to the abnormality detection information.

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