JPS63232715A - Communication system - Google Patents

Abstract

PURPOSE:To smmothly perform a control and a supervision even at the time of the occurrence of a trouble, in a communication system that plural stations are connected by two lines, and the communication is performed between the respective stations by providing a reception control part for each of the said two lines, in the respective stations. CONSTITUTION:A control information is sent to a transmission control parts 15a, 15b through a control inputting part 13. From the transmission control part 15a, the said control information is sent to the reception control parts 35a through a MODEM 41, the first circuit 5 and the MODEM 43. From the transmission control part 15b, the control information is sent to the reception control part 35b through the MODEM 45, the second circuit 7 and the MODEM 47. In a control supervisory device 3, (slave station) it is decided whether the reception data of the reception control part 35a is normal or not, by a reception data selecting part 51, and if it is normal, the reception data of the reception control part 35a is sent to a device 9 to be controlled and supervised through a control outputting part 31, and if it is abnormal, the reception data of the reception control part 35b is sent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention] (Field of Industrial Application) The present invention relates to a communication system in which a plurality of stations are connected through two lines and each station communicates with the other.

(Prior art) Conventionally, the second communication control system for such a communication system was
There is something like the one shown in the figure. As shown in the figure, the control and monitoring device 1 of the master station and the control and monitoring device 3 of the slave station are connected by a first line 5 and a second line 7. The control/monitoring device 3 of the slave station is connected to the controlled/monitoring device 9 . The control and monitoring device 1 includes a main control section 11. Control input section 13. Transmission control section 1
5. Transmission switching unit 17. Reception switching section 19, reception control section 21
．． The monitoring information output section 23 consists of a switching control section 25.

The control and monitoring device 3 also includes a main control section 26. Transmission switching section 272
Communication control unit 29. Control output section 31° reception switching section 33. Reception control unit 35. Monitoring information input section 37. It consists of a switching control section 39.

In addition, modems 41 and 43 are installed in the first lQ5, and the second
A modem 45.47 is provided on the line.

The main controllers 11.26 each control the operation of each part of the control and monitoring device 1.3. The control input section 13 inputs control input information. The monitoring information input section 37 inputs monitoring information.

The transmission control section 15.29 performs transmission control. Transmission switching section 1
7 selects either the first line 5 or the second FA7 for transmission. The transmission switching section 27 similarly selects either the first line 5 or the second line 7 to perform transmission. The reception switching units 19 and 33 respectively select the first line 5 or the second I!
7 and perform reception. Reception control unit 21.
35 performs reception control. The switching control unit 25.39 switches between the first line 5 and the second line 5 during transmission and reception. A command is given as to which one of the 27 to select. The monitoring information output unit 23 outputs monitoring information. The control output unit 31 is the controlled device 9
Control information is output to.

Next, the operation of such a communication system will be explained. 1st
When the communication is performed using the control input section 85, the control information is transmitted to the control input section 13. Transmission control section 15, transmission switching section 17. Modem 41. 1st line 5, modem 43. Receiving (a; VJ exchange section 33.Reception control section 35, control output section 31 is sent to the controlled monitoring device 9. Monitoring information sent from the controlled monitoring device 9 is sent to the monitoring information human power section 37.Transmission control section 29, transmission switching unit 27. modem 43. first line 5, modem 41.
Reception switching unit 19. It is output via the reception control section 21 and the monitoring information section 23.

However, when a problem occurs in the first line 5, the reception control section 21.35 detects that the problem has occurred in the first line 85 and notifies the switching control section 25.39 of this. Switching control section 25
．． 39 is a transmission switching section 17.27 and a reception switching section 19.3
3 to perform communication using the second line 7.

For this reason, in conventional communication systems, in order to obtain received information, it is necessary to wait until the next received data is received, and it is difficult to synchronize line switching.
Control congestion and unmonitoring conditions may occur.

(Problems to be Solved by the Invention) In this way, in the conventional communication system, two lines were switched using a switch, so it was difficult to synchronize when switching, and at this time, control congestion and unmonitoring conditions occurred. There was a problem.

The present invention was made in view of such problems, and the present invention has been made in view of such problems.
] The aim is to provide a communication system that can smoothly control and monitor even when a failure occurs.

[Structure of defense]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a communication system in which a plurality of stations are connected by two lines and each station communicates, and each station has two lines each. This system is characterized by the installation of a reception control section that corresponds to the 1J.

(Function) In the present invention, information is always sent to two lines, and each of these two lines is provided with a reception control unit, so even if a failure occurs in one line, the information is transmitted to the other line. Since it is obtained from the reception control unit, there is no need to synchronize line switching, and control and monitoring can be performed smoothly even when a failure occurs.

(Example) An example of the present invention will be described in detail below based on the drawings. FIG. 1 is a block diagram of a communication control system of a communication system according to an embodiment of the present invention. In the figure, elements that perform the same functions as those of the conventional example shown in FIG. 2 are given the same numbers to avoid redundant explanation. In this embodiment, the control I monitoring device 1 is provided with transmission control sections 15a and 15b, reception control sections 21a and 21b, and a reception data selection section 49. The control all monitoring device 3 also includes transmission control units 29a, 29b and reception control unit 35a.

35b, a received data selection section 51 is provided.

The transmission control units 15a and 29a perform transmission control when using the first Fi15. Reception control section 21a.

35a performs reception control when the first line 5 is used. The transmission control units 15b and 29b perform transmission control when the second line 7 is used. The reception control units 21b and 35b are connected to the second line 7
Performs reception control when using . Received data selection section 49
Which of the reception control units 21a and 21b selects one of the received data and outputs it to the monitoring information output unit 23. The received data selection section 51 causes one of the reception control sections 35a and 35b to select one of the received data and output it to the control output section 31.

Next, the operation of this embodiment will be explained. The control information is sent via the control input section 13 to the transmission control sections 15a and 15b. From the transmission control unit 15a to the modem 41. 1st line5. This sub-part information is sent to the reception control section 35a via the modem 43. From the transmission control unit 15b to the modem 45. 2nd ti
17. The control information is received via the modem 47 by the reception control section 35b.
sent to. In the control I monitoring device 3, the reception control section 3
The received data selection unit 51 determines whether or not the received data 5a is normal, and if it is normal, the reception control unit 3
The received data of 5a is outputted via the control output section 31 to the
+Sent to the monitoring device 9.

When the reception data of the reception control unit 35a is abnormal or cannot be received, the reception data selection unit 51 selects the reception data of the reception control unit 35a.
The received data b is sent to the controlled monitoring device 9 via the control output section 31.

The monitoring information sent from the controlled tIl monitoring V device 9 is sent from the monitoring information input section 37 to the transmission control section 29a.

Sent to 29b. Monitoring information divided into two systems is the first
Through the line 5 and the second Fi 17, the reception control unit 21a,
21b. When the reception data selection section 49 determines that the reception data of the reception control section 21a is normal, this data is outputted via the monitoring information output section 23.

If the data received by the reception control unit 21a is abnormal or cannot be received, the reception data selection unit 49 outputs the data received by the reception control unit 21b via the monitoring information output unit 23.

In this way, in this embodiment, since the reception control unit is provided independently for each line, the reception (H information) is always received in parallel, and even if a failure occurs in one line, the reception information is transferred to the other line. Since it can be obtained immediately from the line, there is no need to synchronize line switching as in the past, and smooth control can be achieved even in the event of a failure.
0 monitoring can be performed.

In this embodiment, there are two systems for the transmission control section and two systems for the reception control section, but it is also possible to have one system for the transmission control section and two systems for only the reception control section.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to shut down a communication system that can smoothly monitor the control 20 even when a failure occurs.

[Brief explanation of drawings]

FIGS. 1 and 2 are block diagrams of the present embodiment and the conventional example, respectively. 1.3... control till monitoring device, 5... first line,
7...Second line

Claims (1)

[Scope of Claim] A communication system in which a plurality of stations are connected through two lines and each station communicates with the other, wherein each station is provided with a reception control unit for each of the two lines.