JPH0420199A - Monitor controller - Google Patents

Abstract

PURPOSE:To flexibly correspond to the expanding of a network by polling- responding, returning polling-right requirement and transferring a polling station from the existing polling station to a wire tapping station to execute the polling- right requirement. CONSTITUTION:When an existing wire tapping station N receives a polling signal from an existing polling station A, it investigates the state of the polling right transfer requirement switch of a setting switch part 5 with accessing an address decoder 4. As a result, when polling right transfer requirement does not exist, an answer ANS is returned to the polling station A and when the polling right transfer requirement exists, the answer ANS to which polling right requirement REQ is added is returned. Then, when the polling right requirement REQ exists at an existing polling station A side, requirement confirmation is transmitted to the station N, the own station abandons a polling right and transfers from the existing polling station to a wire tapping station and on the other hands, the station N starts a polling action. Thus, the polling station within a network is not limited to one fixed station.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a supervisory control device that monitors and controls a network consisting of a plurality of stations mutually connected by lines, and more specifically, the present invention relates to a supervisory control device that monitors and controls a network consisting of a plurality of stations connected to each other via lines, and more specifically, a monitoring and control device that monitors and controls a network consisting of a plurality of stations that are connected to each other by lines. With regard to monitor and control equipment that can be migrated, the aim is to be able to respond flexibly to network expansion and to increase the reliability of monitor and control against various types of failures. In a supervisory control device consisting of a plurality of interconnected stations, one of which functions as a polling station and the other station functions as an interception station to perform supervisory control, one of the interception stations When one of them wants to become a polling station, it sends back a polling right request as a polling response to the polling signal from the current polling station, thereby changing the polling station from the current polling station to the interception station that requested the polling right. The invention is characterized in that it is configured to allow migration.

[Industrial Field of Application] The present invention relates to a supervisory control device that monitors and controls a network consisting of a plurality of stations connected to each other via lines, and more specifically, the present invention relates to a supervisory control device that monitors and controls a network consisting of a plurality of stations connected to each other by lines, and more specifically, the present invention relates to a supervisory control device that monitors and controls a network consisting of a plurality of stations connected to each other by lines. The present invention relates to a monitoring and control device that can be transferred to a computer.

A supervisory control device is required to be able to flexibly respond to an increase in the number of stations that make up a network, and to have high reliability in supervisory control against various types of failures.

[Prior Art] Conventionally, a supervisory control device that monitors a network consisting of multiple stations has generally assigned a dedicated frequency for supervisory control to a line for transmitting and receiving supervisory information between each station. Met.

However, in recent years, it has become common to use a polling method for supervisory control in order to utilize restricted transmission paths effectively and at high speed. In this boring method, since it is not possible to add a frequency for control, a 1:n configuration is adopted in which the number of polling stations in the network is determined to be one fixed station.

That is, FIG. 6 shows a conventional monitoring and control device using a polling method. In FIG. 6, the network is composed of multiple stations A, B, C1...N,
Of these, station A is fixedly determined as a polling station that has polling rights, and the other stations B, C1, . . . N are fixedly determined as eavesdropping stations that only respond to polling.

Polling is carried out from polling station A to each interception station B, C1,
・Sequentially for N, each interception station B, C1. ・N
When receiving a polling signal from polling station A, it returns monitoring information of its own station as a polling response ANS.

[Problem to be Solved by the Invention] When a network expands and the number of stations that make up the network increases, it will be easier to monitor and control if multiple stations in the network can act as polling stations as appropriate. It is flexible. Also, in the event of a failure in the transmission path within the network, the polling station is limited to one fixed station.

There is a possibility that the monitoring information of all stations in the network cannot be collected.In such a case, if another station in the network becomes a polling station and can collect monitoring information, the monitoring control device reliability increases.

However, in conventional supervisory control devices, the polling station is limited to only one fixed station in the network, so it is not flexible enough to accommodate an increase in the number of stations, and has low reliability against failures. .

The present invention has been made in view of the above circumstances, and its purpose is to enable a polling station to be transferred from one station to another in the network, thereby flexibly responding to network expansion. Furthermore, it is an object of the present invention to be able to improve the reliability of monitoring and control against various types of failures.

[Means to solve the problem] FIG. 1 is a diagram explaining the principle of the present invention.

The supervisory control device according to the present invention consists of a plurality of stations A, B, C...N interconnected via lines, one of which is a polling station and the other stations are a polling station. In a supervisory control device configured to perform supervisory control as an interception station, when one of the interception stations wishes to become a polling station, it returns a polling right request REQ as a polling response to a polling signal from the polling station. The present invention is characterized in that the polling station is thereby configured to shift from the current polling station to the interception station that has made the polling right request REQ.

[Operation] Now, assume that station A is the current polling station that has polling rights. In this case, the polling station A, as shown in FIG.
Polling is performed by sequentially transmitting polling signals to the nodes. When each of the interception stations B, C1 and N receives the polling signal, it returns a polling response ANS.

Here, it is assumed that the current eavesdropping station N wants to acquire polling rights and become a polling station.

In this case, when the interception station N receives the polling signal from the polling station A, it includes the polling right request REQ in the polling response ANS to the polling signal, and
It is returned to the current polling station A.

As a result, the current polling station A performs a process of passing the polling right to the interception station N, and becomes an interception station. On the other hand, station N, which was an eavesdropping station, acquires polling rights and becomes a new polling station. From this point on, as shown in Figure 1 (b), station N becomes the current polling station and polls the other intercepting stations A, B, C...M in sequence. , collects monitoring information.

[Example code] Hereinafter, the present invention will be described in detail with reference to the drawings.

Here, the network to which the embodiment of the present invention is applied is the first network.
It shall be the same as shown in the figure. That is,
This is a network consisting of multiple stations A, B, C...N. Here, it is assumed that the stations A, B, C, . . . , N are connected via wireless lines.

FIG. 2 shows an example of the configuration of these stations A, B, C, . . . -N. In Fig. 2, 1 is a CPU (central processing unit) for controlling the entire station, 2 is a ROM (read-only memory) that stores programs for performing various sequences, and 3 is a working RAM (random 4 is an address decoder, 5 is a setting switch section, and 6 is a line interface for communicating with other stations.

The setting switch unit 5 is made up of various setting switches, including a polling right transfer request switch that is turned on when the own station wants to become a polling station. When a predetermined address assigned to the address decoder 4 is accessed from the CRUI, the address decoder 4 decodes and detects the access, checks the on/off states of various switches in the setting switch section 5, and This is a circuit that returns setting switch information to the CPU 1.

The operation of this embodiment will be explained below with reference to the flowcharts of FIGS. 3 to 5.

Each station in this network has a priority setting program that determines whether or not it will become a polling station when its power is turned on. This priority setting includes, for example, predetermining one predetermined station in the network as the polling station with priority, and in the event of a failure of that station, another predetermined station becomes the next polling station.

FIG. 3 is a flowchart showing the processing sequence when power is turned on to each station device. When each station device is powered on, it starts this processing sequence and decides whether or not its own station will become a polling station according to a predetermined priority setting sequence.Step S2) If it becomes a polling station, it will poll other stations. If the station does not become the polling station, the station determines itself as the interception station and starts the interception operation (step S4).

For example, station A is a polling station, and other stations B, C...N
Assume that the station becomes the interception station. Transmission of polling signals from polling station A to each station B, C, . . . , N is performed in the same manner as in the prior art. Here, it is assumed that the current eavesdropping station N desires to become a new polling station in place of the current polling station A. In this case, in station N, the polling right transfer request switch of the setting switch section 5 is turned on.

FIG. 4 shows a processing sequence for transitioning a current polling station to an interception station, and FIG. 5 shows a processing sequence for transitioning a current interception station to a polling station.

In the current interception station N, when the current polling station A receives the laboratory ring signal (step 521), it accesses the address decoder 4 and checks the state of the polling right transfer request switch in the setting switch unit 5 of the current station (step 521). Step 5
22).

As a result, if there is no request for transfer of polling rights,
Performs normal polling response processing and returns a polling response ANS to polling station A (step 826
).

On the other hand, if a polling right transfer request exists in the setting switch unit 5, a polling right request REQ is added to the polling response ANS to the polling station A,
It is returned to polling station A (step 523).

When the current polling station A side receives the polling response ANS from the interception station N (step $11), it checks whether there is a polling right request REQ therein (step 512). If there is no polling right request REQ, normal processing is performed.

On the other hand, if a polling right request REQ exists, a request confirmation is sent to station N (step 313);
The local station relinquishes the polling right, executes a processing sequence for shifting from the current polling station to an interception station, becomes a general interception station, and starts an interception operation (step 514).

On the other hand, when station N receives the request confirmation from station A (step 524), it executes a processing sequence to shift its own station from the current interception station to a polling station, and thereafter starts polling operations (step 525). .

Through the above processing, the polling station in the network is no longer limited to one fixed station, and each station in the network can become a polling station as needed by issuing a polling right request. become.

[Effects of the Invention] As explained above, according to the present invention, even if the line in the network is disconnected due to a failure and the network cannot be properly monitored from the current polling station, other stations can It becomes possible to continue monitoring by becoming a polling station in place of the current polling station, thereby greatly improving the reliability of the monitoring system. Furthermore, even if the scale of the network expands, various stations within the network can serve as inter-room polling stations, making it possible to respond flexibly.

In addition, since the device of the present invention can be realized in terms of circuitry by adding software to a conventional hardware configuration, it is a highly versatile device.

[Brief explanation of drawings]

Fig. 1 is a diagram explaining the principle of the present invention, Fig. 2 is a block diagram showing the hardware configuration of each station of a supervisory control device as an embodiment of the present invention, and Fig. 3 is a startup diagram of each station of the embodiment device. FIG. 4 is a flowchart showing the processing sequence for the current polling station to transition to the interception station; FIG. 5 is a flowchart showing the processing sequence for the current interception station to transition to the polling station. FIG. 6 is a diagram illustrating a conventional monitoring control device using a polling method. 1...-CPU (Central Processing Unit) 2...ROM (Read Only Memory) 3...R
AM (Random Access Memory) 4...Address decoder 5...-Setting switch section 6...Line interface (A) 8AJ Suborin 7gin ◎: r-rin γ station ○: Bone holder In the present invention Figure 1 Figure 2 Figure 3 Figure 6

Claims (1)

[Claims] 1. A plurality of stations (A, B,
C...N), in which one station among the plurality of stations functions as a polling station and the other station functions as an interception station to perform monitoring control, in which one of the interception stations When one of them wants to become a polling station, it sends back a polling right request (REQ) as a polling response to the polling signal from the current polling station, thereby intercepting the polling station from the current polling station that has requested the polling right. A supervisory control device characterized in that it is configured to be transferred to a station.