JPH0323031B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention involves two monitoring devices collecting data, such as rainfall, etc., from each of N monitored stations using a polling method. Concerning improvements to data collection systems that aggregate data from monitored stations.

A system in which two monitoring devices each collect data from a plurality of monitored stations using a polling system and aggregate this data will be described below.

FIG. 2 shows a data collection system in which the correspondence between monitoring and monitored stations is 1:N, and there are two systems.

In Figure 2, 1 is the data aggregation section, 2 is the input,
Output control unit, 3-1, 3-2 are monitoring devices, 4-1
~4-n, 5-1~5-n are transmission lines, 6-1~6
-N, 7-1 to 7-N indicate monitored stations.

In FIG. 2, under the control of the input/output control unit 2, the monitoring device 3-1 uses a polling method to transmit data from the monitored stations 6-1 to 6-N to the corresponding transmission lines 4-1 to 4-n. Collect through.

Also, under the control of the input/output control unit 2, the monitoring device 3-2 uses a polling method to control the monitored station 7.
-1 to 7-N data transmission lines 5 corresponding to each
-1 to 5-n.

Each piece of collected data passes through the input/output control section 2 and is then sent to the data aggregation section 1 to create comprehensive measurement data.

In the above-mentioned data collection system, if the monitoring device 3-2 fails, the collected data will only be collected on one side of the monitoring device 3-1, making it impossible to create comprehensive measurement data as described above. Therefore, it is desired that a data collection system that can rescue system operation in the event of a failure of the monitoring device can be constructed at low cost.

[Conventional technology]

In the data collection system described above, an example of a conventional data collection system that can rescue system operation in the event of a failure of the monitoring device will be described below.

FIG. 3 shows the two monitoring devices 3'-1 and 3'-2 controlled by the monitoring station 14 using the polling method to monitor the respective monitored stations 6-1 to 6-3 and 7-1.
This is a data collection system that collects data from ~7-3.

Note that the same reference numerals indicate the same objects throughout the figures.

In Fig. 3, 3'-1, 3'-2 are monitoring devices, 8-1, 8-2 are transmitting/receiving units, 9-1, 9-2
is a control unit, 10-1 and 10-2 are fault detectors, 1
1-1, 11-4 are current switches, 11-2,
11-3 is a spare switch, 12-1, 12-4
1 is a current switching circuit, 12-2 and 12-3 are backup switching circuits, 13-1 and 13-2 are line switching units, and 1
4 is a monitoring station, S1, S2, S3, S4 are contacts, a
1 to a6 and b1 to b6 indicate contact points.

In FIG. 3, the input/output control unit 2 of the monitoring station 14
Data signals are sent out from the transmitting/receiving sections 8-1 and 8-2 of the monitoring devices 3'-1 and 3'-2, respectively, in response to the control signal.

In this case, regarding the monitoring device 3'-1 side, a data signal is sent from the transmitting/receiving section 8-1, and the current switch S1 of the line switching section 13-1 is connected by a control signal from the control section 9-1. The contacts a1, a2, and a3 of the current switching circuit 12-1 are sequentially switched, and the signals are transmitted through the current transmission lines 4-1, 4-2, and 4-3 corresponding to the data signals, respectively.
Data signals are sequentially received by each of the monitored stations 6-1, 6-2, and 6-3.

Data from each of the monitored stations 6-1 to 6-3 is input to the data aggregation unit 1 via the transmitting/receiving unit 8-1 and the input/output control unit 2 via a route opposite to the outgoing route through which the data signal was transmitted. .

Data transmission is performed in the same manner on the monitoring device 3'-2 side.

That is, the control signal sent from the control section 9-2 closes the contact S4 of the current switch 11-4, and the contacts b4, b5, and b6 of the current switching circuit 12-4 are sequentially switched, and the transmitting/receiving section 8-2 closes. The currently used transmission lines 5-1 and 5-1 respectively correspond to the data signals sent from the
5-2, 5-3 to each monitored station 7-1,
7-2 and 7-3.

The data from each of the monitored stations 7-1 to 7-3 is then input to the data aggregation unit 1 through the forward and reverse routes, and is integrated together with the data from each of the monitored stations 6-1 to 6-3. Measurement data is created and the results are printed out or displayed on a display.

Now, when a failure occurs on the side of the monitoring device 3'-2, the failure data is detected by the failure detector 10-2, and the control unit 9-2 is controlled by the failure detection signal.
The contact of the current switch 11-4 is opened, and the transmitter/receiver section 8-2 is interlocked to stop the transmission of data signals.

Further, this failure detection signal controls the control unit 9-1 of the monitoring device 3'-1, and switches the spare switch 11-2.
, the contacts a1 to a3 and a4 to a6 of the working switching circuit 12-1 and the standby switching circuit 12-2 are sequentially switched, and the data signals sent from the transmitter/receiver are switched to the corresponding working switching circuit. transmission line 4
-1 to 4-3 and backup transmission lines 4-4 to 4-6, the respective monitored stations 6-1 to 6-4 and 7-
1 to 7-3.

In addition, each monitored station 6-1 to 6-3 and 7-1 to 7
Similarly to the above, the data of -3 is input to the data aggregation unit 1 via the reverse route to the outbound route, and is created into predetermined data.

In the event of a failure on the monitoring device 3'-1 side, polling data is collected on the monitoring station 3'-2 side using the active and backup transmission lines in the same manner as described above.

As explained above, in the event of a failure, data from the monitored station is collected using the active and standby transmission lines.

[Problem that the invention seeks to solve]

As explained above, in conventional systems, when one monitoring device fails, the other monitoring device uses a working and backup transmission line to collect data from all monitored stations so as not to hinder system operation. There is a problem in that the data collection system is expensive because it needs to be collected through a computer.

[Means for solving the problem] The above problem is solved by the first problem in a data collection system in which two monitoring devices each collect data from N monitored stations using a polling method and aggregate this data. The N working contacts of the first line switching unit belonging to the monitoring device and the N spare contacts of the second line switching unit belonging to the second monitoring device are connected in parallel using the N first connection lines. At the same time, the N spare contacts of the first line switching unit and the working N contacts of the second line switching unit are connected in parallel by N second connection lines, and the N The first connection lines and the N first monitored stations are connected by the N first transmission lines, and the N second connection lines and the N second monitored stations are connected to each other.
monitored stations are connected by N second transmission paths, and when a failure occurs in one of the monitoring devices, a failure detection signal is used to switch the current N of the line switching unit belonging to the other monitoring device.
The problem is solved by a data collection system characterized in that it is provided with means for sequentially switching between these contacts and N spare contacts.

[Effect]

In the case of the present invention, the switch of the active switching circuit of one monitoring device and the switch of the backup switching circuit of the other monitoring device are connected in parallel with each other through respective connection lines, and the switching circuit of the active switching circuit of the other monitoring device is connected in parallel with each other. The switch of the circuit and the switch of the spare switching circuit of one of the monitoring devices are connected in parallel using a connecting wire.

The above-mentioned parallel connection lines and the corresponding monitored stations are connected by respective currently used transmission lines.

When the system is operating normally, each of the above current switching circuits operates to collect polling data.

Next, in the event of a failure in one (or the other) monitoring device, the data of all monitored stations is transferred to the current transmission path using the spare switching circuit and the current switching circuit of the other (or one) monitoring device. Because it can be collected by
Data collection systems can be configured at low cost.

〔Example〕

FIG. 1 is a block diagram showing the configuration of one embodiment of the data collection system of the present invention.

In Fig. 1, 3''-1 and 3''-2 are monitoring devices, 13'-1 and 13'-2 are line switching units, and 15-
1 to 15-6 are transmission lines, and 16-1 to 16-6 are connection lines.

Figure 1 shows the data collection system of the present invention, which improves the line switching section of the data collection system shown in Figure 3 and collects data from monitored stations using only the currently used transmission line. It is something to do.

That is, the contacts a1, a2, a3 of the active switching circuit 12-1 of the line switching unit 13'-1, and the contacts b1, b2, b3 of the backup switching circuit 12-3 of the line switching unit 13'-2. and the respective connecting wire 1
Connect with 6-1, 16-2, 16-3.

Also, a spare switching circuit 1 of the line switching unit 13'-1
Connect the respective contacts a4, a5, a6 of 2-2 and the respective contacts b4, b5, b6 of the current switching circuit 12-4 of the line switching unit 13'-2 to the respective connection lines 16-
Connect at 4, 16-5, 16-6.

The parallel connection lines 16-1 to 16-6 and the corresponding monitored stations 6-1 to 6-6 are connected through respective transmission lines 15-1 to 15-6.

In the above connection, a data signal is sent from the transmitting/receiving section 8-1 of the monitoring device 3''-1 according to a control command from the input/output control section 2, passes through the current contact S1 of the line switching section 13'-1, Switching circuit 12-1
The monitored stations 6-1 and 6-1 are sequentially switched at contacts a1, a2, and a3 of 6-2 and 6-3.

Regarding the monitoring device 3''-2 side, using the same method as described above, the data signal sent from the transmitting/receiving section 8-2 is transferred from the current switch 11-4 to the switching circuit 12-.
4→connection lines 16-4, 16-5, 16-6→transmission lines 15-4, 15-4, 15-6 to monitored stations 7-1, 7-2, 7-3.

The response signals from the monitored stations 6-1 to 6-3 and 7-1 to 7-3 are transmitted to the data aggregation unit via a route opposite to the outward route, and are created into predetermined data.

When the monitoring station 3″-2 becomes faulty, its fault detection signal is detected by the fault detector 10-2, and the third
As described in the figure, the transmitting/receiving section 8-2 is interlocked, and the data that was sent from the monitoring device 3''-2 is now sent from the monitoring device 3''-1.

That is, the spare switch 11 of the monitoring device 3''-1
-2 contact S2 is closed, and the data signal sent from the transmitter/receiver 8-1 is switched by contacts a1, a2, a3 of the active switching circuit 12-1 and contacts a4, a5, a6 of the standby switching circuit 12-2. are connected to the respective monitored stations 6-1 to 6-3 and 7-1 to 7-1 through the respective connection lines 16-1 to 16-6 and the corresponding current transmission lines 15-1 to 15-6. 7-3.

In this case, contacts S1 and S2 of switches 11-1 and 11-2 and switching circuits 12-1 and 1
The contacts a1 to a3 and a4 to a6 of 2-2 are controlled by the control section 9-1.

Therefore, switch 11-1 is connected, contacts a1 to a3 of switching circuit 12-1 are connected sequentially, and then switch 11-2 is connected, and switching circuit 12-2 is connected.
If contacts a4 to a6 are connected in sequence, the monitored station 6-
Following stations 1 to 6-3, monitored stations 7-1 to 7-3 are sequentially selected.

Moreover, if the switches 11-1 and 11-2 and the contacts a1 to a3 and a4 to a6 are connected alternately, the monitored stations 6-1, 7-1, 6-2, 7-2, 6-
It is also possible to select in the order of 3, 7-3.

All monitored stations may be selected in any order.

When the monitoring device 3''-1 has a failure, the current transmission 15-1 is transmitted from the monitoring station 3''-2 using the same method as described above.
〜15-6 to the monitored station 6-1.
~6-3 and 7-1~7-3.

As explained above, when one monitoring device fails, the other monitoring device is used to collect data from the monitored station via a transmission line that is only used for current use.

[Effects of the Invention] As explained in detail above, according to the present invention, 2
If one of the two monitoring devices has a failure, the other monitoring device uses the polling method to collect data from all monitored stations using the currently used transmission line to ensure system operation is not affected. This has the effect of lowering the cost of the configuration.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the data collection system of the present invention, Fig. 2 is a block diagram of a conventional data collection system, and Fig. 3 shows the configuration of a conventional data collection system with a backup system. It is a block diagram. In the figure, 1 is a data aggregation unit, 1', 14 is a monitoring station, 2 is an input/output control unit, 3-1, 3-2,
3'-1, 3'-2, 3''-1, 3''-2 are monitoring devices, 4-1 to 4-n, 5-1 to 5-n, 15-1
~15-6 is a transmission line, 6-1~6-3, 7-1~
7-3 is a monitored station, 8-1 and 8-2 are transmitting/receiving units,
9-1, 9-2 are control units, 10-1, 10-2 are failure detectors, 11-1, 11-4 are active switches, 11-2, 11-3 are standby switches, 12
-1, 12-4 are current switching circuits, 12-2, 1
2-3 is a spare switching circuit, 13-1, 13-2,
13'-1, 13'-2 are line switching parts, 16-1~
16-6 indicates a connection line.

Claims (1)

[Claims] 1. In a data collection system in which two monitoring devices each collect data from N monitored stations using a polling method and aggregate this data, the current N monitoring device of the first line switching unit belonging to the first monitoring device and the N spare contacts of the second line switching unit belonging to the second monitoring device are connected in parallel by N first connection lines, and the N spare contacts of the first line switching unit 1 contact point and the current N of the second line switching section.
2 contacts in parallel with N second connection wires,
The N first connection lines and the N first monitored stations are connected by the N first transmission paths, and
A second connection line and N second monitored stations are connected by N second transmission lines, and when one of the monitoring devices has a failure, a failure detection signal is sent to the other monitoring device. A data collection system comprising a means for sequentially switching between N working contacts and N standby contacts of a line switching unit.