JPH0758973B2 - Polling type remote monitoring control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a polling type remote monitoring control device, and more particularly to a dual polling type remote monitoring control device.

[Problems of the Background Art] FIG. 3 shows a duplex configuration of a conventional polling type remote monitoring controller. In FIG. 3, in the normal state, a polling command is transmitted from the master station device 2a of the regular system to the slave station devices 10a and 10b via the transmission circuit 3a. Then, this command is issued to the slave station device 1
It is received by the receiving circuits 8a and 8b of 0a and 10b, respectively.

On the other hand, in the slave station device, the line switch 11a is turned on only when the polling command from the master station device 2a is for the self station (for example, the slave station 10), and the information of the self station is transmitted by the transmission circuit 9
It is transmitted to the master station device 2a via a. Information from these slave station devices is received by the receiving circuit 4a of the master station device 2a,
Handed over to Calculator 1.

Now, when an abnormality occurs in the normal-use master station device 2a or the transmission path managed by the master station device 2a, the computer 1 performs the master station device 2a on condition that the information from the slave station devices 10a and 10b is not updated.
To the master station device 2b of the standby system. After this, the polling command is transmitted from the master station device 2b.

On the other hand, the slave station devices 10a and 10b are connected to the transmission path side managed by the master station device 2b by the line selector switches 6a (6b) and 7a (7b) on condition that the line disconnection or the polling command cannot be received for a certain period of time. It Then, the master station device 2b and the slave station device 10
After the switching of a and 10b is completed, the polling command from the master station device and the information from the slave station device are performed from the master station device 2b after switching in the same procedure as described above.

Note that 12a1, 12a2, 12b1 and 12b2 are transmission lines.

[Problems of Background Art] In the conventional apparatus having the above-mentioned configuration, one of the duplicated systems is always used as a regular system and the other is kept in standby as a standby system. Therefore, it is possible to back up when one system is abnormal. However, the master station device in the standby system and the transmission path managed by the master station device are operated in a standby state, and thus have a drawback that they are not used effectively at all times.

[Object of the Invention] The present invention has been made to solve the above-described problems, and always effectively uses a duplicated master station device and transmission path to reduce the load on one side of the master station device. By doing so, it is an object of the present invention to provide a polling type remote monitoring control device with improved transmission efficiency.

[Summary of the Invention] In the present invention, the parent station device issues a command only to the child station devices connected to its own system by the child station sharing determined in advance, and each of the sharing parent station devices receives information on the command. At the same time, each master station device is provided with a separate receiving circuit to intercept the command of the master station device of the other system and monitor the master station device of the other system. It is intended to switch to the operating system side.

Embodiments of the Invention Embodiments will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a polling type remote monitoring control apparatus according to the present invention.

In FIG. 1, the same parts as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted. Reference numerals 13a and 13b denote other-system command reception circuits for intercepting commands from other-system master station devices, and command outputs from the other-system master station devices' transmission circuits 3a and 3b are transmitted via hybrid transformers 14a and 14b. In addition to receiving, the command output from the position passing through each hybrid transformer is also received. That is, each transmission circuit 3a,
Despite the fact that 3b operates normally and transmits command output to the slave station devices 10a and 10b under their control, for example, disconnection of the receiving transmission lines 15a1 and 15b1 or the hybrid transformer 14
This is to ensure that reception is not possible due to abnormalities in a and 14b.

In addition, the meaning of intercepting the command output from the other-system master station device is that when the abnormality of the other-system master station device is detected, the slave station device shared by the other-system master station device is detected by the normal master station device. This is because it is used as a detection signal to be put under control. Other configurations are the same as those in FIG.

Next, the operation will be described. First, the slave station devices 10a and 10b switch the line selector switches 6a (6b) and 7a (7b) to the master station device side to be managed respectively. That is, as apparent from FIG. 1, the slave station device 10a is under the control of the master station device 2a, and the slave station device 10b is under the control of the master station device 2b. When each system is normal, the master station devices 2a and 2b are operated in parallel. Therefore, when both systems are normal, the master station device 2a transmits a command to the slave station device 10a via the transmission circuit 3a, and the command is received by the reception circuit 8a of the slave station device 10a. In the slave station device 10a, only when the command from the master station device 2a is a command to the local station, the line switch 11a is turned on, and the slave station information is transmitted to the master station device via the transmission circuit 9a.
Send to 2a. In the master station device 2a, the receiving circuit 4a receives information from the slave station device 10a under management. On this occasion,
The master station device 2b of the other system is connected to the slave station device 10a via the transmission circuit 3a.
The command transmitted to the other side is intercepted by the other system command receiving circuit 13b via the hybrid transformer 14a and the receiving transmission lines 15a1 and 15a2. Therefore, as long as there is an interception from another system, it can be understood that the corresponding other system is operating normally.

Also, the operation of the master station device 2b is exactly the same as the operation of the master station device 2a described above. Therefore, as long as the master station device 2b is operating normally, a command from the master station device 2b to the slave station device 10b is sent by the master command receiving circuit 13a via the hybrid transformer 14b and the receiving transmission lines 15b1 and 15b2. It can be intercepted on the side of the station device 2a. That is, each master station device transmits a command to each slave station device under its control and also intercepts the transmission signals of other systems.

Now, if an abnormality occurs in the master station device 2a of one system, on the condition that the command from the master station device 2a of the abnormal system cannot be intercepted,
The master station device 2b in a normal system transmits a command to all the slave station devices 10a and 10b and receives information from all the slave station devices 10a and 10b.

Further, when an abnormality occurs in the transmission path of one system, the master station device 2a connected to the abnormal transmission path suspends the transmission of the command to the slave station device 10a, which cannot receive the information for the command.

The master station device 2b of the normal system performs the command to the slave station device 10a in which the command is interrupted by the master station device 2a connected to the abnormal transmission line, and receives the information from the slave station device 10a.

On the other hand, in the slave station device 10a, the master station device 2 to which its own station is connected
On the condition that the command from a cannot be received, the line changeover switches 6a (6b) and 7a (7b) are used to switch to a transmission line to which the master station device 2b of another normal system is connected. Information can be intercepted when the load sharing of the master station devices 2a and 2b and the switching of the transmission path of the slave station device 10a are completed.

FIG. 2 is a block diagram of another embodiment according to the present invention. In this embodiment, a case where the present invention is applied to a loop type transmission line is shown. In FIG. 2, description of the same parts as in FIG. 1 will be omitted.

In FIG. 2, the counterclockwise transmission line 16a1 is connected to the hybrid transformers 17e, 17f, 17i, 17 from the transmission circuit 3a of the master station device 2a.
connected to the receiving circuit 4b of the master station device 2b via j, while
The clockwise transmission path 16b1 is a counterclockwise system and a clockwise circuit by connecting from the transmission circuit 3b of the master station device 2b to the reception circuit 4a of the master station device 2a via the hybrid transformers 17h, 17g, 17d, 17c. Each transmission line of the system is configured.

On the other hand, each slave station is connected via branching units 18 and 19. That is, each branch has two hybrid transformers 17c, 17d (17e, 17f) and 17g, 17h (17) for each transmission line.
i, 17j) and connect each hybrid transformer 17c to 17j
And the respective slave station devices 10a, 10b are line selector switches 6a (6b), 7a
Connected via (7b).

For example, in the case of the slave station device 10a, the line selector switch 6a connected to the receiving circuit 8a is connected to the lines from the hybrid transformers 17d and 17e close to the signal source in both the left-handed system and the right-handed system. The output from the transmission circuit 9a is connected to the hybrid transformers 17c and 17f farther from the signal source.

And the hybrid transformers 17c to 17d, 17e to 17f, 17g to 17 inserted in the left-handed and right-handed transmission lines described above.
Between h, 17i and 17j, switches 20a, 20b,
20c and 20d are provided. The slave station device 12b also makes a similar connection.
Further, the master station devices 2a and 2b are respectively provided with receiving circuits (other system command receiving circuits) for intercepting commands from other system master station devices, and the hybrid transformers 21a and 21b receive commands from the respective transmitting circuits 3a and 3b.
intercept via b. With this configuration, the master station device 2a is responsible for exchanging information with the slave station device 10a, and the master station device 2b is responsible for exchanging information with the slave station device 10b. Also, the receiving transmission lines 15a1, 15a2, 15b1,1
Duplicating 5b2 is the same as in the above-mentioned embodiment.

Next, the flow of information will be described. The command from the master station device 2a is received counterclockwise by the reception circuit 8a of the slave station device 10a via the transmission circuit 3a. At this time, the master station device 2b is
Intercept commands from other systems via the transformer 21a. On the other hand, in the slave station device 10a, the line switch 11a is turned on only when the received command is a command to the own station, and the transmission circuit 9a
The slave station information is transmitted counterclockwise to the master station device 2a via. In the master station device 2a, the receiver circuit 4a receives the slave station information. At this time, the slave station device 10a turns off the transmission path open switch 20a while transmitting information to the master station device 2a so as not to conflict with the clockwise command from the other-system master station device 2b. .
Also, the exchange of information between the master station device 2b and the slave station device 10b is the same as in the case of the master station device 2a described above.

Here, if one of the master station devices 2a is abnormal or the transmission path is abnormal, the slave station device 10a cannot receive a command for a certain period of time. Therefore, the slave station device 10a switches the line selector switches 6a and 7a to connect to the other system on the condition that the command from the master station device 2a cannot be received for a certain period of time. When the transmission line is abnormal, the open switch 20b is turned off to disconnect the abnormal transmission line. In addition, the master station device 2b of the other system
Then, the slave station device 10a is put under control on condition that the command from the master station device 2a cannot be intercepted.

On the other hand, when the transmission line from the slave station device 10a is abnormal, the master station device 2a suspends the transmission to the slave station on the condition that it cannot receive from the slave station device 10a. The operation thereafter is as described above.

However, in this case, the opening switch 20a is turned off for abnormal disconnection of the line. This is manually performed by a command from the master station device or a slave station.

[Effect of the Invention] As described above, according to the present invention, the duplicated devices are operated in parallel, and each master station device is provided with the other system command receiving circuit for receiving the command output from the other system master station device. Since each system intercepts the command output from the master station device of the other system and monitors this information, it automatically switches the slave station devices of the other system. Not only can the load be shared and the two systems can be efficiently utilized, but also automatic switching is possible even when the one-system master station device is abnormal, and the system reliability can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a polling type remote monitoring control device according to the present invention, FIG. 2 is a block diagram of another embodiment, and FIG. 3 is a block diagram of a conventional device. 1 ... Computer, 2a, 2b ... Master station device 3a, 3b, 9a, 9b ... Transmitting circuit 4a, 4b, 8a, 8b ... Receiving circuit 5a-5h, 17c-17j, 14a, 14b, 21a, 21b ...... Hybrid
Transformer 6a, 6b, 7a, 7b ...... Line change switch 10a, 10b ...... Slave station device 11a, 11b ...... Line switch 12a1, 12a2, 12b1, 12b2 ...... Transmission line 13a, 13b ...... Other system command receiving circuit 15a1 , 15a2,15b1,15b2 …… Reception transmission line 16a1, 16b1 …… Loop transmission line 18,19 …… Branching part 20a to 20d …… Open switch

Claims (1)

[Claims] 1. A master station device and a slave station device which are duplicated share a transmission line, and the slave station device in question occupies the shared transmission line in response to a command from the master station device and the master station device. In the remote monitoring control device for polling method for transmitting the slave station device information to each of the slave station devices, each slave station device is connected to a shared transmission line via a hybrid transformer at a branch position, and the slave station device includes a master station device. A line switch connected to the receiving circuit and the transmitting circuit for receiving the call signal from the device and transmitting the information signal to the master station device; and a line switch for connecting and switching the line switch to the shared transmission line at the branch position. In the branch position, four hybrid transformers are provided on the shared transmission line, and the line selector switches are hybrid switches that are close to the signal source for each slave station device.
A line configuration that allows connection and switching to a transformer is provided, and the duplicated master station device shares a predetermined slave station device under the control and operates in parallel, and each master station device has another A receiving circuit is provided for receiving the command output from the parent station device of the system via the hybrid transformer and from the position where the hybrid transformer has passed, and in the case of an abnormality of another system, the command output from the parent station device of the other system is mutually transmitted. By monitoring by intercepting and monitoring the master station device of other system and the transmission path under its control, switching control of the slave station device under the control of the master station device of other system to the own system control in case of abnormality of other system A far-distance monitoring and control device using a polling method.