JPH01276830A - Erroneous switching relieving system for signal switching device - Google Patents

Abstract

PURPOSE:To relieve the erroneous switching of a latching relay by providing a control/status comparing means to compare the control contents judged by a control condition holding means and the detecting contents detected by a status detecting means and add the compared result to a switching circuit. CONSTITUTION:When the control contents of a control circuit 1 are stored into a control condition holding circuit 1, the stored control contents and the output of a status detecting means 3 to show the condition of a switching circuit 4 are compared, and the compared result is wrong, a switching trigger or a re-switching trigger is generated by a control/status comparing means 2. The generated switching trigger or the re-switching trigger are added to the switching circuit 4, a communication line is switched and recovered to an original condition. Thus, a signal switching device, when an abnormality occurs at the connection due to a maintenance, impact, vibration, noise, etc., can relieve the erroneous switching.

Description

[Detailed Description of the Invention] [Summary] This problem occurs when an abnormality occurs in the connection between the signal switching device and another device regarding a signal switching device that uses a latching relay to switch and switch back the working/backup communication line. For the purpose of relieving erroneous switching, a control signal is input to instruct the switching of the working/backup communication line, and a latching relay provided in the switching circuit is used to switch between the two communication lines. A control state holding means that determines whether the communication line should be switched or switched back, and latches and outputs the control content; and a latching relay provided in the switching circuit that determines whether the communication line should be switched or switched back. A status detection means detects whether the state of A control/status comparison means is provided in addition to the control/status comparison means, and the latching relay is configured to recover from erroneous switching based on the comparison result.

[Industrial application field]

The present invention relates to a signal switching device that uses a latching relay for switching and switching back and forth between working and backup communication lines.

In a multiplex communication line, in order to maintain communication reliability, a protection line is provided together with a working line, and both communication lines are connected to a signal switching device to switch between the working line and the protection line. In this case, when the communication signal is a ternary signal, the IC
Switching by circuit requires complicated circuit configuration, so
Use a relay circuit that allows easy circuit configuration.

There are two types of relays: non-latching relays and latching relays. When using a non-latching relay, the coil of the relay is constantly energized, so even if the state of the relay changes due to an impact, etc., the relay returns to its original state immediately, but when the number of relays increases, the current capacity becomes extremely large. There are disadvantages. In addition, latching relays maintain a switching state or a switching state when a current is passed through the coil for a certain period of time, so power consumption increases at times, but power consumption during normal times can be reduced. However, if the state of the relay changes due to an impact or the like due to temporary energization, it will remain in that state until the next energization and will not recover to its original state. Therefore, when considering lower power consumption of signal switching devices using latching relays,
A circuit is required to restore power by energizing the coil again when the operating state of the relay changes. The present invention provides a method for restoring the original state using a latching relay.

[Conventional technology]

FIG. 3 is a block diagram showing one conventional embodiment, and FIG. 4 is a block diagram showing another conventional embodiment. explain.

As shown in FIG. 3, when an alarm signal indicating an abnormality in the current communication line is input to the control circuit 10, the control circuit 10 generates a switching trigger and switches the signal switching device 30.
Put it on. This switching trigger is input to the pulse generation circuit 31 to generate a relay drive pulse several times the operating time of the latching relay, and input to the first drive circuit 32 where it is amplified. A current necessary for the switching operation of the relay is passed through the terminal S of the first switching relay 35 and the terminal S of the second switching relay 36, which is also a latching relay, to perform the switching operation of the communication line. At this time, the terminal S of the status relay 37 is also driven, turning the contact r1 of the status signal generating circuit 38 on or off, generating a status signal and feeding it back to the control circuit IO. This feedback signal is generated in the control circuit 10 by comparing the state of the status signal generation circuit 38 determined by the status relay 37 and the control content that the control circuit 10 wants to control. By switching between the first switching relay 35 and the second switching relay 36, the malfunction can be relieved.

On the other hand, when the alarm signal disappears, the control circuit 10 generates a reversal trigger to perform reversal, and the pulse generation circuit 33
is input to generate a relay drive pulse for the latching relay and applied to the second drive circuit 34, and its output is used to generate a relay drive pulse for the latching relay.
terminal R of the switching relay 35 and the second switching relay 36
The communication line is switched back to the working line by passing the current necessary to operate the relay at terminal R of the terminal R.

The status signal generating circuit 38 outputs the output of the first drive circuit 32 and the second drive circuit to the terminal S of the status relay 37 during switching operation, and to the terminal R of the status relay 37 during switching operation. I would like to generate a status signal by turning the contact RL on or off when the output of the circuit 34 is applied, and return the generated signal to the control circuit 10 to control the state of the status relay 37. The malfunction is corrected by comparing the status.

Note that FIG. 4 shows the first switching relay 35 shown in FIG.
and the second switching relay 36 are shared with the status relay 37 shown in FIG.

Note that in the circuits shown in FIGS. 3 and 4 above,
When an abnormality occurs in the connection between the control circuit 10 and the signal switching device 30, for example when the control circuit 1o is being replaced, shock, vibration, noise, etc. are applied to the signal switching device 30, causing the latching relay to malfunction. Even if a switch occurs, it is not possible to restore the original condition.

[Problem to be solved by the invention]

As mentioned above, when the control circuit is not connected due to maintenance or failure of the control system unit, if the latching relay switches erroneously due to shock, vibration, noise, etc., the conventional circuit has a launch function. As a result, necessary layer states are lost, resulting in a problem in which erroneous switching cannot be repaired.

An object of the present invention is to relieve erroneous switching that occurs when an abnormality occurs in the connection between a signal switching device and another device.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle configuration of a signal switching device according to the present invention.

In the figure, reference numeral 1 denotes a control state holding means, which inputs a control signal instructing switching of the working/protection line, judges whether control should be performed to switch or cut back both communication lines, and controls the content of the control. 4 is a switching circuit that stores and outputs information, and 4 is a switching circuit equipped with a latching relay for switching between the working and standby communication lines; 3 is a status detecting means, and the latching relay provided in the switching circuit 4 is used for switching. It detects whether the system is in a cutback state or not, and outputs the detection details.

The control/status comparing means 2 compares the control content determined by the control state holding means 1 with the status detecting means 3.
The switching circuit 4 compares the detected contents and uses the comparison result.
Configure the configuration to switch in addition to .

[For production]

In the present invention, as shown in FIG. 1, the control contents of the control circuit 1 are stored in the control state holding circuit 1, and the stored control contents are compared with the output of the status detection means 3 indicating the state of the switching circuit 4. , when the comparison result is wrong, control/
The status comparison circuit 2 generates a switching trigger or a reverting trigger.

This generated switching trigger or reverting trigger is applied to the switching circuit 4 to switch the communication line and restore the original dish shape.

(Example〕 FIG. 2 is a configuration diagram showing an embodiment of the present invention.

In the figure, IO is a control circuit, 20 is a signal switching device, 21 is a control status holding circuit as a control holding means, and 22 is a control circuit as a control/status comparing means. 23 is a first pulse generation circuit; 24 is an all/status comparison circuit;
is the first relay drive circuit, 25 is the first switching relay,
26 is a second pulse generating circuit, 27 is a second relay drive circuit, and 28 is a first switching relay, which corresponds to the switching circuit 4 in FIG. 1.

Further, 29 is a status signal generation circuit as a status detection means.

In FIG. 2, when an alarm signal is input to the control circuit 1o, a switching control signal is output, and when the alarm signal disappears, a switching control signal is output, and both signal outputs are input to a control state holding circuit 21 and stored. .

The stored result is compared with the status signal output from the status signal generation circuit 29 in the control/status comparison circuit 22, and if the comparison result is wrong, a switching trigger is triggered.
Alternatively, the first pulse generation circuit 2 generates a reversal trigger.
3 or the second pulse generating circuit 26. As described below in the conventional example shown in FIGS. 3 and 4, when an alarm signal is input to the control circuit 10, the control/status comparison circuit 22 generates a switching trigger and operates the first pulse generation circuit 24. Then, the first relay drive circuit 24 generates a relay drive pulse several times the operating time of the latching relay, thereby driving the first switching relay 25 and the second switching relay 28 to perform switching.

On the other hand, when the alarm signal disappears, the control/status comparison circuit 22 generates a revert trigger, and the second pulse generation circuit 26 and second relay drive circuit 27 drive the relay for several times the operating time of the latching relay. A pulse is generated to drive the first switching relay 24 and the second switching relay 28 to perform switching back.

That is, in this circuit, the control contents to be held are stored in the control state holding circuit 21, and if the first switching relay 25
Even if there is an erroneous switching in the second switching relay 28,
By comparing the operating states of both relays with the stored control details, if there is a difference in the comparison results, it is possible to restore the original state.

〔Effect of the invention〕

As explained above, according to the present invention, the signal switching device includes: 1. Even if an abnormality occurs in the connection due to maintenance, shock, vibration, noise, etc., it is possible to correct the incorrect switching, and it is highly effective in increasing the number of communication line switching operations.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle configuration of the signal switching device of the present invention, FIG. 2 is a configuration diagram showing an embodiment of the present invention, FIG. 3 is a configuration diagram showing a conventional embodiment, and FIG. A configuration diagram showing another conventional example is shown. In the figure, 1 is a control state holding means, 2 is a control/status comparison circuit, 3 is a status detection means, and 4 is a switching circuit. Figure 2

Claims (1)

[Scope of Claims] A device in which a control signal for instructing switching between a working/backup communication line is input, and a latching relay provided in a switching circuit (4) switches between the two communication lines, wherein the control signal is input and both communication lines are switched. control state holding means (1) for determining whether to control line switching or switching back, and storing and outputting the control contents; and the switching circuit (4).
), which detects whether the latching relay provided in the controller is in a switching or reverting state, and outputs the detected content; and the control content determined by the control status holding means (1). A control/status comparing means (2) is provided which compares the detection content detected by the status detecting means (3) and applies the comparison result to the switching circuit (4), and uses the comparison result to prevent erroneous switching of the latching relay. A method for relieving erroneous switching of a signal switching device.