JPH02131628A - Line switching device - Google Patents

Abstract

PURPOSE:To execute desired line switching by supervising whether or not desired line switching by a relay switch is executed at a supervisory section after a switch command is given from a control section and informing the monitor information to the control section. CONSTITUTION:Suppose that a switch is thrown to pass the data of a standby line 16B and a line switch control signal to pass a data of an active line 16A is given from a line switch control section 4, then a collation section 53A of a check circuit 5A supervises it that a desired line changeover by a relay switch 3A is executed after the switch command is given from a minicomputer 13A. If it is detected by the check circuit 5A that the switch 3A does not execute the desired line changeover, a bypass switch 7A closes a bypass 6A to execute the desired line changeover. Thus, the possibility of mis-discrimination that the line is switched is precluded.

Description

[Detailed Description of the Invention] [Summary] Regarding a line switching device that switches between lines, it is possible to monitor whether or not a desired line switching by a relay switch is actually executed, and to ensure that normal switching is performed. The purpose is to make it possible to perform the desired line switching using other means even if the line is not available. a control unit that monitors whether or not the desired line switching is performed by the relay switch after the switch opening/closing instruction is issued from the control unit, and notifies the control unit of monitoring information;
The system is configured to include a bypass switch that closes the bypass path of the relay switch and performs the desired line switching when the monitoring unit detects that the relay switch has not performed the desired line switching. [Industrial Application Field] The present invention relates to a line switching device that switches between lines. [Prior Art] Conventionally, as shown in FIG. 4, a pair of relay switches 102 and 103 operate either a line 100 of its own system or a line 101 of another system in mutually inverted modes.
A line switching device has been proposed that uses . In order to switch the line in such a case, the minicomputer (hereinafter referred to as minicomputer) 104 sends a switching command to the line switching control unit (LSW) 105.
A line switching control signal is output to the relay switch 102,
This is done by opening and closing 103. Note that when the line switching control signal is "1", switching to the line 101 of another system (relay switch 102 is open, relay switch 10 is
3 is closed), and when the line switching control signal is "0", the switch is switched back to the own line 100 (relay switch 102 is closed).
is closed, and relay switch 103 is opened). Note that the line switching control signal is also supplied to the minicomputer 104 as a signal indicating the switching state.

Furthermore, as shown in FIG.
Data is transmitted to the master station 200 using a communication line or the like, but in this case, the line is duplicated to ensure data transmission. That is, in addition to the active system 202, an identical backup system 203 is prepared, and if a failure occurs in the active system 202, the backup system 203
It is designed to switch to the side. A line switching device is also used to perform line switching between the active and standby systems.

By the way, the active system 202 includes a data transmission interface 10A, a relay switch 11A. A data receiving interface 12A is provided, and the minicomputer 13
A. A line switching control unit 14A is provided, and the backup system 203 is provided with a data transmission interface 10B, a relay switch IIB, and a data reception interface 12B, as well as a minicomputer 13B and a line switching control unit 14B.
is provided. Here, the data transmission interfaces 10A and 10B are for cyclically transmitting data from the sensor 15, the relay switch IIA is a mechanical contact type switch for opening and closing the working line 16A, and the relay switch 11B is for opening and closing the working line 16B. A mechanical contact type switch for opening and closing the data receiving interface 12A. 12B is for sending the received data to the host computer 17.
In addition, the minicomputers 13A and 13B have a line switching control unit 14A.
, 14B, and the line switching control units 14A, 14B control the open/close states of the relay switches 11A, 11B by issuing a line switching control signal in response to the line switching commands from the minicomputers 13A, 13B. However, this line switching control signal is sent to the minicomputers 13A and 1.
It is also returned to 3B as a signal indicating the switching state. With such a configuration, if a failure occurs in the active system 202, the minicomputers 13A and 13B issue a switching command to the line switching control units 14A and 14B, and the line switching control units 14A and 14B, which receive the command, respectively Relay switch IIA
, IIB to open and close relay switches IIA and IIB, the backup system 203
A switch to the side is performed.

[Problems to be Solved by the Invention] However, in any of these conventional line switching devices, the minicomputer does not know the actual switching state of the relay switch, and ultimately performs line switching that moves the relay switch. The switching state of the relay inch was determined by detecting a change in the state of the control signal, so even if the state of the line switching control signal had changed, there was no problem with the relay switch. , even if the switching is not performed normally, there is a risk of erroneously determining that the line has been switched. The present invention has been made in view of these problems, and makes it possible to monitor whether or not the desired line switching by a relay switch has actually been carried out, and to monitor other lines even if the switching is not carried out normally. The purpose of this invention is to provide a line switching device that can perform desired line switching using a method. [Means for solving the problem] Figure 1 shows a block diagram of the principle of the present invention. In this Figure 1, 1 is the first line, 2 is the second line, 3 is a relay switch that switches to either of these lines 1 or 2, and 4 is a switch that controls the opening/closing state of relay switch 3. This is the control section. Reference numeral 5 denotes a monitoring unit that monitors whether or not the desired line switching is performed by the relay switch 3 after the switch opening/closing instruction is issued from the control unit 4, and notifies the control unit 4 of monitoring information. 6A and 6B are the first terminals of the relay switch 3. The second line bypass paths 7A and 7B are bypass switches interposed in the bypass paths 6A and 6B, and the bypass switches 7A and 7B are
is a switch that closes the bypass paths 6A and 6B of the relay switch 3 to perform the desired line switching when the monitoring unit 5 detects that the relay switch 3 has not executed the desired line switching. ．． [Function] With such a configuration, for example, the relay switch 3
Suppose that the control unit 4 issues a line switching control signal to pass the data on the second line 2 while the line 1 is switched to pass the data on the second line 2. In this case, the monitoring section 5 monitors whether or not the desired line switching is performed by the relay switch 3 after the switch opening/closing instruction is issued from the control section 4, and this monitoring information is sent to the control section 4. You have been notified. If the monitoring unit 5 detects that the relay switch 3 has not executed the desired line switching, the bypass switch 7B closes the bypass path 6B of the relay switch 3 and executes the desired line switching. do. Note that when the relay switch 3 is switched to pass data on the second line 2 side, and a line switching control signal is issued from the control unit 4 to pass data on the first line 1 side, The monitoring unit 5 monitors whether or not the desired line switching has been performed by the relay switch 3 after the switch opening/closing instruction is issued from the control unit 4, and notifies the control unit 4 of this monitoring information as described above. As in the case above, if the monitoring unit 5 detects that the relay switch 3 has not performed the desired line switching, in this case, the bypass switch 7A closes the bypass path 6A of the relay switch 3. and execute the desired line switching.

[Examples] Examples of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing one embodiment of the present invention.
Also in the embodiment shown in FIG. 2, the master station (monitoring station) 2
An example is shown in which a slave station 201 is installed at a location away from 00, and data from this slave station 201 is transmitted to the master station 200 using a duplex communication system. That is, in addition to the active system 202, an identical backup system 203 is prepared,
If a failure occurs in the active system 202, the system switches to the backup system 203. The working line 202 includes a working line (first line) 1.
6A, a data transmission interface 10A, a relay switch 3A, a data reception interface 12A, a minicomputer 13A, and a line switching control section 4A, a check circuit 5A as a monitoring section and a bypass switch 7A are provided. , backup line (second line) 16
B, data transmission interface 10B, relay switch 3B. In addition to the data receiving interface 12B, minicomputer 13B, and line switching control section 4B, a check circuit 5B and a bypass switch 7B as a monitoring section are provided. Here, the data transmission interfaces 10A, 10B .
The data receiving interfaces 12A, 12B and the host computer 17 are almost the same as those of the conventional system, so their explanation will be omitted. Further, the relay switch 3A is a mechanical contact type switch for opening and closing the working line 16A, and corresponds to the relay switch 11A shown in Fig. 5, and the relay switch 3B is a mechanical contact type switch for opening and closing the protection line 16B. So, the fifth
It corresponds to relay switch 11B shown in the figure. The minicomputers 13A and 13B are line switching control units 4A and 4B.
It is the same as the conventional minicomputer shown in FIG. 5 in that it issues a line switching command to the line switch, but the signal indicating the switching state is returned from the check circuits 5A and 5B rather than from the line switching control units 4A and 4B. different. The line switching control units 4A and 4B are
Relay switch 3A receives line switching commands from mini-computers 13A and 13B and issues a line switching control signal.
, 3B, but this line switching control signal is not returned to the minicomputers 13A, 13B. Therefore, these minicomputers 13A, 13B and line switching control units 4A, 4B constitute a control unit that controls the open/close states of the relay switches 3A, 3B.

Check circuits 5A, 5B are line switching control units 4A, 4B.
Relay switch 3 after the switch opening/closing instruction is issued from
The minicomputers 13A and 3B monitor whether or not the desired line switching has been performed. This is to notify monitoring information to 13B.

Bypass switches 7A and 7B are bypass paths 6A and 6B.
are installed in the check circuits 5A and 5B, and the relay switches 3A. When it is detected that circuit 3B has not executed the desired line switching, bypass paths 6A and 6B of relay switches 7A and 7B receive signals from check circuits 5A and 5B.
This is a switch that performs desired line switching by closing the line. Note that each bypass switch 7A. 7B consists of analog switches such as semiconductor switches. Next, the configuration of the check circuits 5A and 5B will be explained using FIG. That is, the check circuits 5A, 5B are configured with mono multivibrators 51A, 51B: 52A, 52B and collation sections 53A, 53B. Here, mono multivibrators 51A, 51B; 52
A, 52B detect the rise (or fall) of the signals (pulse signals) on both sides of the relay switches 3A, 3B, and the collation parts 53A, 53B detect the rise (or fall) of the signals (pulse signals) on both sides of the relay switches 3A, 3B.
After receiving the switching command from 13B, the detection information between the mono multivibrators 51A, 51B: 52A, 52B is compared and verified, and the verification result is notified to the mini-computers 13A, 13B as monitoring information, and if they match, If not, it outputs a signal to close the bypass switches 7A and 7B. With such a configuration, if a failure occurs in the active system 202, the minicomputer 13A,
13B issues a switching command to the line switching control units 4A, 4B, and the line switching control units 4A, 4B that receive the command further issue line switching control signals to each relay switch 3A, 3B to open and close the relay switches 3A, 3B. By doing so, switching to the standby system 203 side is performed. In this case, in the check circuit 5B, the minicomputer 1
After the switching instruction is issued from 3B, relay switch 3B
It monitors whether the desired line switching has been executed, and this monitoring information is notified to the minicomputer 13B. If the verification unit 53B of the check circuit 5B detects that the relay switch 3B is not closed but remains open, a closing signal is sent to the bypass switch 7B to turn on the bypass switch 7B. , Preliminary episode M16B
Execute side line switching. Note that while the data on the protection line 16B side is switched to pass, the line switching control unit 4A transfers data to the working line 16B.
When a line switching control signal is issued to pass the data on the A side, the verification unit 53A of the check circuit 5A executes the desired line switching by the relay switch 3A after the switch opening/closing instruction is issued from the minicomputer 13A. It is the same as the above case in that it monitors whether the check circuit 5A has been
When it is detected that the relay switch 3A has not executed the desired line switching, in this case, the bypass switch 7A closes the bypass path 6A of the relay switch 3A and executes the desired line switching. In this way, it is possible to monitor whether the desired line switching by the relay switches 3A, 3B has actually been performed, and thereby, even though the state of the line switching control signal has changed, the relay switches 3A, 3B. Even if there is some kind of failure in 3B and normal switching is not performed,
There is no risk of mistakenly determining that the line has been switched. Furthermore, even if normal switching is not performed, desired line switching can be performed using the bypass switches 7A and 7B, which is effective in relieving failures. In addition to the analog switch, it is also possible to use a mechanical contact type switch as the bypass switch. Furthermore, the present invention can be applied not only when switching between the active system and the backup system but also when switching between at least two lines. [Effects of the Invention] As detailed above, according to the line switching device of the present invention,
It is possible to monitor whether the desired line switching by the relay switch has actually been performed, and this shows that even though the state of the line switching control signal has changed, there is some fault in the relay switch and the switching is normal. Even if the line is not switched, there is no risk of mistakenly identifying that the line has been switched.In addition, even if the line is not switched normally, the bypass switch can be used to perform the desired line switching. It is also effective in saving time.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a block diagram showing an embodiment of the invention, Fig. 3 is a block diagram showing a relay switch, bypass switch, and check circuit, and Fig. 4 is a conventional example. Figure 5 is a block diagram showing another conventional example. In the figure, 1 is the first line, 2 is the second line, 3, 3A, 3B are relay switches, 4 is the control unit, 4A, 4B are line switching control units, 5 is the monitoring unit, 5A, 5B are the checks Circuit, 6A and 6B are bypass paths, ? A, 7B are bypass switches, 10A, IOB are data transmission interfaces, 12A
, 12B is a data reception interface, 13A, 13
B is a minicomputer, 15 is a sensor, 16A is a working line (first line), 16B is a protection line (second line), 17 is a host computer, 51A, 51B, 52A, 52B are mono multivibrators, 53A, 53B 200 is a master station, 201 is a slave station, 202 is a working system, and 203 is a preliminary f system. 6A6B--Bypass road Month U of the present invention! Block diagrams 6A, 6B -- 4 bus routes 7A, 7 days 1 bus switch 16A - 1 working line 16B - 1 backup line 1,000, bypass switch ÷, ± 7 times %
Figure 3

Claims (1)

[Claims] The first line (1; 16A) or the second line (2; 16A)
B) Relay switch (3; 3A)
, 3B), a control unit (4; 4A, 4B, 13A, 13B) that controls the open/close state of the relay switch (3; 3A, 3B), and the control unit (4; 4A, 4B, 13A, 13B). The relay switch (3; 3A
, 3B) has been executed, and the controller (4; 4A, 4B, 13A, 13B)
A monitoring unit (5; 5A, 5B) that notifies monitoring information to the relay switch (3;
When it is detected that the relay switch (3; 3A, 3B) has not executed the desired line switching, the bypass path (6A, 6B) of the relay switch (3; 3A, 3B) is closed to execute the desired line switching. A line switching device characterized in that it is configured with bypass switches (7A, 7B).