JPH08265319A - Duplex monitoring control system - Google Patents

Abstract

PURPOSE: To prevent a processing speed of control information from being lowered in an emergency case when a throughput of monitoring information is increased and to continue a monitoring control functional even on a fault of a transmission line at two places simultaneously by processing a monitoring controller of systems 0 and 1 by taking partial charge of control and monitoring functions, respectively in a duplex monitoring control system for a communication network (ring system). CONSTITUTION: The monitoring controller 1 of the system 0 and the monitoring controller 2 of the system 1 take partial charge of the control and monitoring functions in an ordinary operation, and they transmit/receive health check data mutually via duplexed transmission lines, and monitor an opposite operating state, and succeed the opposite function of the system in which abnormality is detected. Also, they perform the health check of directly connected devices 4, 7, and the system detection the abnormality stops its own monitoring function when no health check response is received, and transfers the function to the opposite system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual supervisory control system, and more particularly to a dual supervisory control system for supervising and controlling a communication network such as a LAN formed by connecting a plurality of devices in a ring shape or a bus shape. Regarding

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a redundant supervisory control system for a communication network of this type has dual supervisory control devices 31, 32 connected by a communication bus such as Ethernets 44, 45, and this supervisory control is performed. Either system of the device operates as the active system and the other system operates as the standby system. Both systems simultaneously process both the monitoring function and the control function during operation, and access the communication network via the device 34 among the devices constituting the communication network to perform overall monitoring control information. ing. Both systems and supervisory control devices 31, 3
A terminal 33 is connected to 2 via a data line, and control or processing of monitoring information is performed by an instruction signal from the terminal 33.

The system switching operation of this system will be described with reference to FIG. 7. From the state step S0 at the time of initial startup, the state transitions to S1 in response to an instruction from the terminal 33. When the working system becomes abnormal, the state automatically transits to S2. When the abnormality of the active system is recovered, the state becomes S3. When the standby system becomes abnormal, the state automatically shifts to S4. When the abnormality in the standby system is recovered, the state transits to S1. In this duplex system, the active system always performs the supervisory control process, and the other system is a hot standby system that does not perform the process unless the active system becomes abnormal.

The supervisory control device 31 for the active system and the standby system,
32 The health check data indicating the operating state of each other is constantly converted via the ESAT 4 and 45 to know each other's failure.

[0005]

As described above, in the conventional dual supervisory control system, the processing of the control function and the supervisory function is concentrated in the supervisory control device operating as the active system, and the alarms are simultaneously issued from each device of the network. In the event of occurrence, there is a problem that the processing load of the monitoring function is increased, the processing capacity of the control function is significantly reduced due to the influence, and the emergency control such as a switching command to each device is delayed. Further, although the supervisory control device is duplicated, there is only one device at the access point with the network side, and there is a problem that if the device at this access point fails, the entire system will go down.

[0006]

SUMMARY OF THE INVENTION A dual supervisory control system and method according to the present invention is a dual supervisory control for supervising and controlling a communication network composed of a plurality of devices and a transmission line connecting the devices. In the system,
Accessing the communication network via one of the plurality of devices to perform the monitoring control, system 0 monitoring control device, and access to the communication network via another one of the plurality of devices. A 1-system supervisory control device for performing this supervisory control is provided.

Further, the 0-system and 1-system supervisory control units monitor the state of the partner supervisory control unit via the communication network and the supervisory control unit having a supervisory function and a control function separately, and when an abnormality occurs, an alarm signal is sent. The partner device monitoring means that issues the command function, the 0-system monitoring control device normally shares the control function, the 1-system monitoring control device shares the monitoring function, and the 1-system monitoring control device shares the command capability for the entire period. When the alarm signal is received from the device monitoring means, there is provided a function allotment switching means for substituting the function of the partner monitoring control apparatus.

[0008]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing this embodiment. In this figure, a ring network in which devices 4 to 13 are connected in a ring shape is monitored and controlled by the monitoring control devices 1 and 2 and the terminal 3 connected to the monitoring control devices 1 and 2. The 0-system monitoring control apparatus 1 is directly connected to the apparatus 4, the 1-system monitoring control apparatus 2 is directly connected to the apparatus 7, and the monitoring control apparatuses are connected to the paths of the apparatuses 4 to 5 to 6 to 7. Devices 13-12
It is duplicated in the routes of ˜11 to 10 to 9 to 8 to 7.
The right-handed and left-handed duplexed inter-system transmission lines have their route directions automatically switched by the inter-device routing function of the devices 4 to 13.

The supervisory control devices 1 and 2 are separately provided with a supervisory function and a control function, and their operation modes are a control mode in which only the control function is operated, a supervisory mode in which only the supervisory function is operated, a control function and a supervisory function. There is a control + monitor mode to operate, and a standby mode in which neither the control function nor the monitor function operates, and it is possible to operate in any state.

Next, referring to FIG. 2 and FIG. 3 in addition to FIG. 1, an outline of the operation of this embodiment will be described. Regarding the operation mode of the supervisory control device, the operation mode of one system is usually the control mode, and the operation mode of the other system is the monitoring mode.
If the operation mode of the 0 system is the control mode and the operation mode of the 1 system is the monitoring mode (step S1 in FIG. 2), the control operation from the terminal 3 is 0 when the operation mode is the control mode.
Is sent to the supervisory control device 1 of the system, and is sent to the network device 4
The specified device is instructed via the. Further, the alarm information from each device is transmitted via the device 7 to the 1-system monitoring control device 2 whose operation mode is the monitoring mode, and transferred to the terminal 3.

Further, the monitoring control devices 1 and 2 constantly transmit the health check data to each other and respond to each other, thereby diagnosing whether or not the processing unit of the partner system is normal,
If no response is received from the partner system for a certain period of time, the partner system is judged to be abnormal. When the 1-system monitoring control apparatus 1 operating in the monitoring mode becomes abnormal, the 0-system monitoring control apparatus 2 detects the abnormality and notifies the apparatus 4 to 13 of the alarm information to its own system. Along with commanding, the self-system automatically activates the monitoring function. In this state, the operation mode of the 0 system supervisory controller 1 is controlled +
The monitor mode is set (S2).

When the abnormality of the 1-system is recovered, the operation mode of the 1-system becomes the standby mode (S3). When the 0-system becomes abnormal in this state, the 1-system detects the abnormality and commands the devices A to J to notify the self-system of alarm information, and the self-system automatically operates the monitoring function. The 0 system is abnormal, and the 1 system operation mode becomes the monitoring mode (S4). Regarding the control mode, automatic state transition is not performed, but this state transition is performed by a control operation from the terminal 3. Next, when the 0-system abnormality is recovered, the 0-system becomes the standby mode (S5).
From the state of step S5, it is possible to transition to the state of S4 by an instruction from the terminal 3.

FIG. 3 is a diagram showing a state transition when a device directly connected to the supervisory control device becomes abnormal. The monitoring control devices 1 and 2 not only diagnose the mutual system states, but also connect the connected devices 4 to 1 by a health check.
Diagnosing 3. When the monitoring control device does not receive a response to the health check from the device for a certain period of time, the monitoring control device determines that the device is abnormal. In particular, when there is no response to the health check from the directly connected devices (devices 4 and 7), it is determined that the device is a directly connected device. When the operation mode is the state of step S6 in FIG. 3 and an abnormality is detected in the device 7 directly connected to the 1-system, the 1-system supervisory controller 2 issues a supervisory function start command to the 0-system supervisory controller 2. The 1-system itself transits to the standby mode and enters the state of S7. In this state, after the abnormality of the device 7 is recovered, if the device 4 directly connected to the 0-system becomes abnormal, the 0-system monitoring controller 1 issues a monitoring function start command to the 1-system monitoring controller. Issuing, the 1-system itself transits to the control mode and enters the state of S6.

Next, a case where a failure occurs in the transmission path will be described. Since this network has a ring structure and a communication path is secured by a redundant route for a failure in one transmission path, no communication failure occurs. For example, between the devices 4 and 7 and between the devices 11 and 12 When both transmission lines become abnormal, the 0-system detects an abnormality of the 1-system and the 1-system detects an abnormality of the 0-system, so that the monitoring control devices of both systems are in a state in which the monitoring functions operate simultaneously. In this state, the device 4
The ring system of devices # 13 to # 13 is divided into a group G1 of devices 4, 5, 12, and 13 and a group G2 of devices 6 to 11. The alarm of the device of the group G1 is 0 via the device 4.
To the monitoring control device 1 of the system, and the alarms of the devices of the group G2 are transferred to the monitoring control device 2 of the 1 system via the device 7. Therefore, the monitoring control of the entire ring-shaped transmission line is continued in the 0 system and the 1 system. can do.

[0015]

As described above, in the dual supervisory control system according to the present invention, since the dual supervisory control device always processes two functions, that is, the control function and the supervisory function, respectively, This is effective in avoiding a problem such as a decrease in the processing speed of the control function, for example, in an abnormal child of the monitored device whose processing amount of the monitoring function increases.

Further, the connection device 0 of the redundant supervisory control device
Since it is divided into the system and the system, there is an effect that the monitoring control of the device can be continued even when two failures occur simultaneously in the transmission path of the ring system.

[Brief description of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart showing a sharing function switching operation when the monitoring control device in FIG. 1 is abnormal.

FIG. 3 is a flowchart showing a switching operation of the sharing function when the connection device is abnormal in FIG.

FIG. 4 is a block diagram showing an example of a transmission path failure in FIG.

FIG. 5 is a block diagram showing a conventional example.

6 is a flowchart showing a sharing function switching operation when the monitoring control device in FIG. 5 is abnormal.

[Explanation of symbols]

 1 Monitor and control device (0 system) 2 Monitor and control device (1 system) 3 Terminals 4 to 13 devices (ring system)

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Claims (2)

[Claims] 1. A dual supervisory control system for monitoring and controlling a communication network composed of a plurality of devices and a transmission line connecting each device, wherein one device among the plurality of devices is used. A system 0 supervisory control device that accesses the communication network to perform this supervisory control, and a system 1 supervisory control device that accesses the communication network via another device of the plurality of devices to perform the supervisory control. A dual supervisory control system, comprising: 2. The 0-system and 1-system supervisory control devices monitor and control means having a supervisory function and a control function separately, and monitor the state of the partner supervisory control device via the communication network and send an alarm signal when an abnormality occurs. The partner device monitoring means that issues the alarm function, and the 0-system monitoring control device normally shares the control function, and the 1-system monitoring control device shares the monitoring function, and receives the alarm signal from the partner device monitoring means. 2. The dual supervisory control system according to claim 1, further comprising: a function assignment switching unit that substitutes the function of the control device.