JPH1041901A - Supervisory control equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the supervisory control equipment by which a control station is able to locate a fault location even when a maintenance personnel does not visit a controlled station in the case that a fault is detected by supervision and by which each installation equipment is supervised through the use of a control transmission line in the case that a cause to the supervised fault is a fault in a supervisory transmission line. SOLUTION: When a control station detects a supervised fault (S1), a line switching signal is sent to a controlled station (S2), and a transmission line switching unit at the control station side is activated (S3). Then the controlled station receives the line switching signal (S4) and a transmission line switching unit at the controlled station is active to allow a control transmission line to be used as a supervisory transmission line (S5).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring and control device for remotely controlling and monitoring various plants such as water treatment, electric power, roads, buildings, factories, etc., and more particularly to a one-way double transmission such as a four-wire circuit. The present invention relates to a remote monitoring control device using a road.

[0002]

2. Description of the Related Art In recent years, in various plants as described above, in order to efficiently operate, maintain, and manage the plants, various equipments of the plant have been centrally monitored and controlled at remote locations. ing.

As shown in FIG. 5, such monitoring and control involves remote control and monitoring of equipment (not shown) of a plant connected to the controlled place 52 via the controlled place 52. A controlled station 52 that receives monitoring information (display / measurement information and abnormal information) from the equipment and transmits the information to the control center 51 and controls the equipment based on the control information received from the control center 51; The control station 51 and the controlled station 52 are communicably connected via a line 53 such as a public line, for example. The control center 51 includes a display unit such as a graphic panel and a display (not shown) and an input unit for performing control input and the like, and a resident operator performs monitoring control.

The control station 51 and the controlled station 52 have modems 54 and 57, respectively, and the line 53 is a four-wire line. As a result, the transmission of the control data and the transmission of the monitoring data may be performed by different transmission paths. That is, the control data output from the CPU unit 56 of the control center 51 is transmitted to the output terminal 54a of the modem 54 and the input terminal 5 of the modem 57 of the controlled site 52.
The monitoring data transmitted by the transmission line 53a as a control transmission line connecting the control terminal 7b and the CPU unit 58 of the controlled place 52 is output from the output terminal 57a of the modem 57.
The signal is transmitted via a transmission line 53b as a monitoring transmission line connecting the input terminal 54b of the modem 54 of the control center 51 with the input terminal 54b.

The control station 51 is provided with a monitoring abnormality detecting unit 55. In the case of a cyclic transmission system in which monitoring data is periodically transmitted, monitoring data from the controlled station 52 is set in advance. When the monitoring cycle is interrupted, the monitoring abnormality detection unit 55 detects a monitoring abnormality.

[0006]

However, in the above-described conventional configuration, monitoring data from the controlled station 52 does not arrive until the abnormal part is restored after the monitoring abnormality occurs.
A problem arises in that it is not possible to monitor various equipment connected to the controlled place 52.

[0007] Even if the monitoring abnormality is detected, whether the abnormality is located in the internal circuit of the controlled place 52 or not, the monitoring transmission line 5
3b, there is a problem that a person has to go to the controlled place 52 in order to identify the abnormal part.

[0008] The above-mentioned problem similarly occurs when a control abnormality occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to detect an abnormal point in a control station even if a person does not go to a controlled station when a monitoring abnormality is detected. It is another object of the present invention to provide a monitoring control device capable of specifying and, when the cause of the monitoring abnormality is an abnormality of the monitoring transmission line, transmitting monitoring data using the control transmission line. Another object of the present invention is to provide a monitoring control apparatus capable of transmitting control data using a monitoring transmission line when a control abnormality is detected and the cause of the control abnormality is an abnormality of the control transmission line. Is to provide. Further, another object is to alternately transmit control data and monitoring data by using the transmission line on which no abnormality occurs when either the control transmission line or the monitoring transmission line is disconnected. It is an object of the present invention to provide a monitoring control device capable of performing half-duplex communication for transmission.

[0010]

According to a first aspect of the present invention, there is provided a monitoring and control apparatus, wherein a control station and a controlled station are communicably connected via first and second transmission lines. The control data is transmitted from the control station to the controlled station via the second transmission path, and the monitoring data is transmitted from the controlled station to the control station via the second transmission line. Is provided with monitoring abnormality detecting means for detecting the following. In order to solve the above-mentioned problem, the following means are taken.

That is, when the control station detects a communication error of the monitoring data by the monitoring abnormality detecting means, the control station notifies the control station of the fact that the communication error has occurred. After the first transmission path switching means for switching to the first transmission path or the second transmission path and the monitoring abnormality notifying means notifies the controlled station of the communication error of the monitoring data, the input path of the monitoring data is changed to the first transmission path. And a first control means for controlling the first transmission path switching means so that the transmission path of the monitoring data is switched to the first transmission path or the second transmission path in the controlled place. Means,
And a second control means for controlling the second transmission path switching means so that the transmission path of the monitoring data becomes the first transmission path after receiving the communication abnormality notification of the monitoring data by the monitoring abnormality notification means. .

According to the above configuration, the monitoring data from the controlled station is controlled depending on whether an abnormality occurs in the second transmission line for transmitting the monitoring data or an abnormality occurs in the internal circuit of the controlled station. When it does not reach the place, a monitoring abnormality is detected by the monitoring abnormality detecting means.

When the monitoring abnormality is detected, the monitoring abnormality notifying means notifies the controlled station of the monitoring abnormality. Thereafter, the first control means controls the input path of the monitoring data by the first transmission path switching means. Switch to the transmission path. Subsequently, after the controlled site receives the communication abnormality notification of the monitoring data by the monitoring abnormality notification unit, the second control unit switches the transmission line of the monitoring data to the first transmission line by the second transmission line switching unit. .

Thus, the second transmission of the monitoring data is performed.
Even if an abnormality occurs in the transmission line, the monitoring data can be transmitted using the first transmission line.

When the cause of the monitoring abnormality is an abnormality in the transmission line, the above-mentioned means can transmit the monitoring data using the first transmission line. If the cause of the monitoring abnormality is in the internal circuit of the controlled station, the above means cannot transmit the monitoring data. From this, it is possible to specify whether the location where the abnormality has occurred is in the transmission line or in the internal circuit of the controlled location. Therefore, if it is possible to specify that the abnormality occurrence location is on the transmission line, it is possible to save the trouble of going to the controlled place to detect the abnormality occurrence location as in the related art.

According to a second aspect of the present invention, there is provided a monitoring and control apparatus comprising: a control abnormality detecting means for detecting a control data communication abnormality in the controlled place; and a control data communication abnormality detected by the control abnormality detection means. The control station is provided with control abnormality notification means for notifying the fact, and in order to solve the above problem, in addition to the configuration of claim 1, the first transmission path switching means includes: The control data transmission path can be switched to a first transmission path or a second transmission path, and the first control means transmits the control data transmission path after receiving the control data communication abnormality notification from the control abnormality notification means. Is the second
The first transmission path switching means is controlled to be a transmission path, and the second transmission path switching means is capable of switching an input path of control data to the first transmission path or the second transmission path. The means controls the second transmission path switching means such that the control data input path becomes the second transmission path after the control abnormality notification means notifies the control center of the control data communication abnormality. I have.

According to the above configuration, when an abnormality occurs in the first transmission line for transmitting the control data, the control abnormality is detected by the control abnormality detecting means.

When the control abnormality is detected, the control abnormality notification means notifies the control center of the control abnormality, and thereafter, the second control means has the second transmission path switching means to switch the control data input path to the second transmission path. Switch to the road. Subsequently, after the control station receives the communication abnormality notification of the control data by the control abnormality notification means, the first control means switches the control data transmission path to the second transmission path with the first transmission path switching means.

Thus, the first control data transmission is performed.
Even if an abnormality occurs in the transmission path, control data can be transmitted using the second transmission path.

According to a third aspect of the present invention, in order to solve the above-mentioned problem, in addition to the configuration of the first or second aspect, the first and second control means do not cause any abnormality. The switching operation of the transmission line by the first and second transmission line switching means is performed periodically so that the monitoring data and the control data are alternately transmitted using the transmission line.

With the above arrangement, for example, when an abnormality occurs in the second transmission line used for transmitting the monitoring data, the means according to the first aspect uses the first transmission line in which no abnormality has occurred. The first and second control means are adapted to transmit the monitoring data by the first and second control means.
The transmission path is switched by the transmission path switching means. Then, after the transmission of the monitoring data has been transmitted for a fixed period, the transmission path is switched again to the state before the occurrence of the abnormality, and the control data can be transmitted by the first transmission path. Is done.

By repeating the above operation, even if an abnormality occurs in the second transmission line, half-duplex communication in which control data and monitoring data are alternately transmitted using the first transmission line can be performed.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

The monitoring and control device according to the present embodiment is similar to that of FIG.
As shown in FIG. 1, a control station 1 and a controlled station 2 are communicably connected one to one via a line 3 such as a public line. The line 3 is capable of one-way duplex transmission by using two transmission lines (two sets of two-wire lines) such as a four-wire line. That is,
The control data output from the CPU unit 7 of the control center 1 is transmitted through a transmission path 3a as a first transmission path,
The monitoring data output from the CPU unit 11 of the controlled place 2 is transmitted via the transmission line 3b as the second transmission line. Although FIG. 1 shows an example in which only one controlled place 2 is connected to the control place 1, a plurality of controlled places 2 can be connected to the control place 1.

The control station 1 includes a transmission line switching unit 4 as first transmission line switching means, a modem 5, a monitoring abnormality detecting unit 6 as monitoring abnormality detecting means, a control data transmitting process and a monitoring data receiving process. CPU unit 7 serving as a monitoring abnormality notification unit for performing the above-described operations and a first control unit
And a display unit such as a graphic panel and a display (not shown) provided in the control center 1 and a man-machine interface (input unit) for performing various operation inputs including control inputs. It performs remote control and monitoring of various connected equipment (not shown).

The controlled station 2 includes a transmission line switching unit 8 as a second transmission line switching unit, a modem 9, a control abnormality detection unit 10 as a control abnormality detection unit, a monitoring data transmission process, and a control data reception process. The control unit includes a control abnormality notification unit that performs processing and the like and a CPU unit 11 as a second control unit.

The monitoring control device according to the present embodiment transmits the monitoring data by a cyclic transmission method in which the monitoring data is periodically transmitted.
The units 7 and 11 have memory units 14 and 15 for storing a transmission cycle which is a criterion for determining a communication error or a switching cycle at the time of transmission line switching.

The transmission lines 3a and 3b are connected to the input and output terminals of the modems 5.9 and 9 via the transmission line switching units 4.8 for the control station 1 and the controlled station 2, respectively.

As shown in FIG. 3 and FIG. 4, the transmission line switching units 4 and 8 are relays 12 for switching contacts according to signals output from the CPU units 7 and 11.
13. These relays 12 and 13 do not operate when the monitoring and control device is normal. As shown in FIG. 3, the transmission line 3a is connected to the output terminal 5a of the modem 5 and the input terminal 9b of the modem 9 to transmit control data. It is used as a control transmission line for transmission. The transmission path 3b is connected to the output terminal 9a of the modem 9 and the input terminal 5b of the modem 5, and is used as a monitoring transmission path for transmitting monitoring data.

However, if the transmission lines 3a and 3b
In the case where an abnormality occurs in any one of the above, in particular, when an abnormality occurs in the transmission line 3b used as a monitoring transmission line and the transmission line is disconnected, data transmission cannot be performed, and the monitoring control function is not performed. It stops.

Therefore, the monitoring and control device is provided with the transmission line 3
a) When a failure occurs in one of 3a and 3b, the transmission path is switched so that monitoring data and control data can be alternately transmitted using the transmission path on which no abnormality has occurred by switching the transmission path. Is provided.

Next, the transmission path switching operation will be described mainly with reference to FIG.
This will be described in detail with reference to FIG. Here, a case where the transmission line 3b, which is the monitoring transmission line, is disconnected will be exemplified.

When an abnormality occurs in the transmission line 3b, which is a monitoring transmission line, and the transmission line is disconnected, first, a monitoring abnormality is detected by the monitoring abnormality detection unit 6 provided in the control station 1 (S1). The monitoring abnormality detection unit 6 determines that a monitoring abnormality has occurred when the monitoring data transmitted from the controlled site 2 is interrupted by a predetermined transmission cycle (for example, three or more times).

When a monitoring abnormality is detected by the monitoring abnormality detecting unit 6, a CPU serving as a monitoring abnormality notification unit is provided.
A transmission line switching signal is output from the unit 7 and transmitted to the controlled site 2 through the control transmission line 3a (S2). After outputting the transmission path switching signal, the CPU unit 7 switches the transmission path switching unit 4 of the control center 1 (S3).
Note that, in the present embodiment, the CPU unit 7 is
The first transmission path switching signal to be transmitted to the monitoring data is a communication abnormality notification of the monitoring data.

When the controlled station 2 receives the transmission line switching signal (S4), the transmission path is switched by the transmission line switching unit 8 of the controlled station 2 (S5). Switching the transmission path
This is achieved by operating the relays in the transmission path switching units 4 and 8 in accordance with the signals output from the CPU units 7 and 11. In this case, as shown in FIG.
2 operate to connect the output terminal 9a of the modem 9 and the input terminal 5b of the modem 5 via the transmission line 3a. That is, the transmission path 3a is switched from the control transmission path to the monitoring transmission path by switching the transmission path.

Next, when the transmission path 3a is switched to the monitoring transmission path, the monitoring data is transmitted from the controlled station 2 to the monitoring cycle using the monitoring transmission path 3a. (3 times or more) is transmitted to the control center 1 (S6).

Subsequently, the CPU unit 11 of the controlled place 2
Then, a transmission path switching signal is output and transmitted to the control station 1 through the monitoring transmission path 3a (S7). After outputting the transmission path switching signal, the CPU unit 11 switches the transmission path switching unit 8 of the control center 2 (S8).

When the control center 1 receives the transmission line switching signal (S9), the transmission line is switched by the transmission line switching unit 4 of the control center 1 (S10). In this case, when the relay 12 is operated again, the state returns to the original state shown in FIG. That is, the output terminal 5a of the modem 5 and the input terminal 9b of the modem 9 are connected to the transmission line 3a, and the transmission line 3a is switched from the monitoring transmission line to the control transmission line.

When the transmission line 3a is switched to the control transmission line, the control station 1 uses the control transmission line 3a to transmit the control data from the transmission cycle (preferably three times) set in the memory unit 14 in advance. Is transmitted to the controlled station 2 (S11).

At the same time as the processing of S11, the transmission path 3b
In order to check whether or not is restored, the controlled station 2 issues a transmission path restoration confirmation signal (S12). At this point, the connection state of the line is, as shown in FIG.
Are connected to the output terminal 9a of the modem 9 of the controlled place 2 and the input terminal 5b of the modem 5 of the control place 1. Therefore, the transmission path return confirmation signal output from the output terminal 9a of the modem 9 is transmitted to the transmission path 3b. When this transmission path return confirmation signal is received by the control center 1, it is understood that the transmission path 3b has returned.
In the present embodiment, a transmission path return confirmation signal is output from the controlled plant 2 to check whether the transmission path 3b is returning. However, instead of the transmission path return confirmation signal, normal monitoring data is output. May be output.

At this point, the transmission path 3b is disconnected.
Is restored (YES in S13), the procedure is finished at the present time, and normal transmission using the line 3 having two transmission paths is performed. If the transmission path 3b has not returned (S1
(NO in 3), the operations from S2 to S13 are repeated until the transmission path 3b returns.

As described above, when the transmission path 3b used as the monitoring transmission path is disconnected due to some abnormality, the transmission path 3a used as the control transmission path is transmitted by the transmission path switching units 4.8. The road can be switched. Thereby, even if the transmission path 3b is disconnected, the monitoring data can be transmitted using the transmission path 3a.

Furthermore, if the transmission line is switched by the transmission line switching unit so that the transmission line 3a alternately becomes a monitoring transmission line and a control transmission line periodically, half-duplex communication using the transmission line 3a is realized. It becomes possible.

Further, the monitoring abnormality detection unit determines that the monitoring data transmitted from the controlled station 2 has been interrupted by a predetermined transmission cycle and indicates that the monitoring abnormality has occurred. In addition to the case, the monitoring abnormality is also detected when an abnormality occurs in the internal circuit of the controlled place 2. However, when an abnormality occurs in the internal circuit of the controlled place 2, even if the transmission path is switched thereafter, the monitoring data cannot be transmitted. Therefore, it can be determined whether the location where the abnormality has occurred is the transmission path or the internal circuit of the controlled plant 2 based on whether the transmission of the monitoring data is enabled by the transmission path switching.
Thus, if the location where the abnormality occurs can be specified as the transmission path, it is possible to save the trouble of going to the controlled place 2 to detect the location where the abnormality has occurred as in the related art.

Further, when the transmission path is restored, the monitoring and control device itself detects it and returns to the original communication mode, so that it is not necessary to confirm the restoration of the transmission path artificially.

In this embodiment, half-duplex communication for transmitting control data and monitoring data using the control transmission line 3a is performed after the transmission line disconnection of the monitoring transmission line 3b is detected. After the control transmission path 3a is first switched to the monitoring transmission path, the transmission path switching may not be performed for a predetermined time, and the transmission path 3a may continue to be used as the monitoring transmission path. However,
After a predetermined time, it is set so as to return to the original state shown in FIG. 3 again, so that an opportunity for control on the control center 1 side can be secured.

In this embodiment, the monitoring transmission line 3b
Shows a case where the transmission line is disconnected, but the control transmission line 3
Even when the transmission line a is disconnected, the control data can be transmitted using the monitoring transmission line 3b. Of course, it is also possible to perform half-duplex communication using the monitoring transmission line 3b. In this case, the control abnormality detection unit 10 as the control abnormality detection means detects the control abnormality of the control transmission line 3a, and the CPU unit 11 as the control abnormality notification means issues a transmission line switching signal. In this case, in the transmission line switching unit, the relays 13 operate.

[0048]

As described above, the monitoring control apparatus according to the first aspect of the present invention notifies the control station when the communication abnormality of the monitoring data is detected by the monitoring abnormality detecting means, to the controlled station. Monitoring error notification means, a first transmission path switching means for switching an input path of monitoring data to a first transmission path or a second transmission path, and the monitoring abnormality notification means notifies the controlled station of a communication error of monitoring data. And a first control means for controlling the first transmission path switching means so that the input path of the monitoring data becomes the first transmission path. A second transmission path switching means for switching to a second transmission path or a second transmission path, and a second transmission path for transmitting the monitoring data to the first transmission path after receiving the communication abnormality notification of the monitoring data by the monitoring abnormality notification means. The second control that controls the road switching means It is a structure in which a means is provided.

Therefore, even if an abnormality occurs in the second transmission line for transmitting the monitoring data, by switching the transmission line,
There is an effect that the monitoring data can be transmitted on the first transmission path.

The monitoring abnormality detecting means detects a monitoring abnormality even when an abnormality occurs in the internal circuit of the controlled place. In this case, even if the transmission path is switched by the transmission path switching means, the monitoring abnormality is detected. Monitoring data cannot be transmitted. Therefore, it can be determined whether the abnormality occurrence location is the transmission path or the internal circuit of the controlled place by determining whether the transmission of the monitoring data is enabled by the transmission path switching, and if the abnormality occurrence location can be identified as the transmission path, In addition to the above, there is an effect that it is possible to save the trouble of going to the controlled place in order to detect the location where the abnormality has occurred.

According to a second aspect of the present invention, as described above, in addition to the configuration of the first aspect, the first transmission path switching means sets the transmission path of the control data to the first transmission path or the second transmission path. The first control means can switch to a transmission path so that the control data transmission path becomes the second transmission path after receiving the control data communication abnormality notification from the control abnormality notification means. Means for switching the input path of the control data to the first transmission path or the second transmission path, and the second control means controls the control abnormality notification means by the control abnormality notification means. After notifying the control data communication abnormality to the second place, the second transmission path switching means is controlled so that the control data input path becomes the second transmission path.

Therefore, in addition to the effect of the configuration of claim 1, even if an abnormality occurs in the first transmission line for transmitting the control data, the transmission line is switched so that the control data of the second transmission line is changed. There is an effect that transmission can be performed.

According to a third aspect of the present invention, as described above, in addition to the configuration of the first or second aspect, each of the first and second control means has a function in which no abnormality has occurred. In this configuration, the first and second transmission path switching means periodically perform the transmission path switching operation so that the monitoring data and the control data are alternately transmitted using the transmission path.

Therefore, even if an abnormality occurs in one of the first and second transmission lines, the control data and the monitoring data are alternately transmitted using the transmission line on which no abnormality has occurred. There is an effect that double communication can be performed.

[Brief description of the drawings]

FIG. 1 illustrates one embodiment of the present invention, and is a flowchart illustrating a transmission line switching operation of a supervisory control device.

FIG. 2 is a block diagram showing a configuration of a main part of the monitoring control device.

FIG. 3 is an explanatory diagram showing a connection mode of a transmission line switching unit of the monitoring and control device in a normal state.

FIG. 4 is an explanatory diagram showing a connection form of a transmission line switching unit of the monitoring and control device when monitoring data is transmitted using a control transmission line.

FIG. 5 is a block diagram illustrating a configuration of a main part of a conventional monitoring control device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Control place 2 Controlled place 3a Transmission path (first transmission path) 3b Transmission path (second transmission path) 4 Transmission path switching unit (first transmission path switching means) 5.9 Modem 6 Monitoring abnormality detecting unit (monitoring abnormality 7 CPU unit (monitoring abnormality notifying unit / first control unit) 8 Transmission line switching unit (second transmission line switching unit) 10 Control abnormality detecting unit (control abnormality detecting unit) 11 CPU unit (control abnormality notifying unit Second
Control means) 12/13 Relay 14 Memory unit 15 Memory unit

Claims (3)

[Claims] A control station and a controlled station are communicably connected to each other via first and second transmission paths. Normally, control data is transmitted from the control station to the controlled station via the first transmission path. Monitoring data transmitted from the controlled station to the control station via a second transmission path, and the control station includes monitoring abnormality detecting means for detecting a communication error of the monitoring data. In the apparatus, when a communication abnormality of monitoring data is detected by the monitoring abnormality detecting means in the control station, a monitoring abnormality notification means for notifying the control station of the detection abnormality, and an input path of the monitoring data is provided to the first control station. After the first transmission path switching means for switching to the transmission path or the second transmission path and the monitoring abnormality notification means notifies the controlled station of the communication error of the monitoring data, the monitoring data input path becomes the first transmission path. As the first transmission A first control means for controlling a switching means; a second transmission path switching means for switching a transmission path of monitoring data to a first transmission path or a second transmission path in the controlled place; and the monitoring abnormality notification means. And a second control means for controlling the second transmission path switching means so that the transmission path of the monitoring data becomes the first transmission path after receiving the communication abnormality notification of the monitoring data according to the above. Monitoring and control equipment. 2. A control abnormality detecting means for detecting an abnormality in communication of control data in the controlled place, and when the communication abnormality in control data is detected by the control abnormality detecting means, the control center is notified of the abnormality. The monitoring and control device, comprising: a control abnormality notifying unit for notifying, the first transmission line switching unit switches the transmission path of the control data to the first transmission line.
The transmission path can be switched to a transmission path or a second transmission path, and the first control means causes the transmission path of the control data to become the second transmission path after receiving the communication abnormality notification of the control data by the control abnormality notification means. The first transmission path switching means controls the input path of the control data to the first transmission path switching means.
The control line can be switched to a transmission line or a second transmission line, and the second control unit sets the control data input line to the second transmission line after the control abnormality notification unit notifies the control station of a control data communication abnormality. 2. The monitoring and control device according to claim 1, wherein the second transmission line switching means is controlled so as to satisfy the following condition. 3. The first and second control means respectively control the first and second control means so that monitoring data and control data are alternately transmitted using a transmission line on which no abnormality has occurred. 3. The supervisory control device according to claim 1, wherein the transmission path switching means is caused to periodically perform a transmission path switching operation.