JPS61212155A - System switching circuit for duplexing device - Google Patents

Abstract

PURPOSE:To reduce the cost by forming two devices by all the same constitution, and constituting a system switching circuit of a duplexing device by two sets of devices of one kind. CONSTITUTION:Devices 1, 2 are formed by the same constitution, and form a system switching circuit of a duplexing device. When a power source is turned on in a state that output circuits 11, 21 are normal, a relay ALM1 does not operate since a terminal 106 is not grounded, and accordingly, a relay ACT1 operates, and by a make contact act 1, an output of the output circuit 11 is sent out of a terminal 101. In such a state, if an abnormality is generated in the output circuit 11, the terminal 106 of a detecting circuit 12 is grounded, therefore, the relay ALM1 operates and an operation of the relay ACT1 is released, and make contacts act11 and act12 are opened. As a result, a relay ACT2 of the other device 2 operates and a make contact act21 is closed, and an output of the output circuit 21 is sent out of a terminal 201.

Description

[Detailed Description of the Invention] [Summary] A system switching circuit for duplexing equipment, which is connected so that the operating status of each duplexed equipment can be mutually monitored, and which uses information on whether one equipment is in operation or on standby. Each device has a built-in function that makes the other device standby or active.

[Industrial application field]

The present invention relates to a system switching circuit for a duplexing device that includes two sets of identical devices, one of which operates as an active system and the other as a standby system.

For example, in a private branch exchange (PBX), each component device, including the ringer, is duplicated, and one is operated as an active system and the other as a standby system, so that when a failure occurs in the active system, The system is configured to immediately switch the standby system to the active system and continue operation.

In this way, by duplicating the component equipment, reliability can be improved.

It is desirable to suppress as much as possible the increase in cost associated with the increase in component equipment.

[Conventional technology]

FIG. 3 is a block diagram showing the configuration of a conventional example of a system switching circuit of a duplexing device, and is similar to FIG.

1' is a first output device, and 2' is a second output device.

4 selects and outputs the output of the first output device 1' when an abnormality of the first output device 1' is not detected, and when an abnormality of the first output device 1' is detected, This is a system switching circuit that selects and outputs the output of the second output device 2'.

[Problem that the invention seeks to solve]

In the system switching circuit of the duplexing device having the above configuration, there is a problem that the cost increases because it is composed of three devices of two types.

Therefore, one object of the present invention is to reduce the cost by reducing the types of devices constituting the system switching circuit of a duplex system.

[Means for solving problems]

FIG. 1 is a block diagram showing the principle of a system switching circuit of a duplexing device according to the present invention.

■ and 2 are two devices with the same configuration, 1
1 to 14 and 21 to 24 are the equipment and components of the device 2, respectively.

11 and 21 are output circuits that output signals.

12 and 22 are detection circuits for detecting an abnormality in each of the output circuits 11 and 12;

13 and 23 control so as to transmit the output of the output circuit 11 or 21 and suppress the output of the other output device 21 or 11 when the device 1 or 2 is set to the operating system. A first control circuit that suppresses the output of the output circuit 1 or 21 and controls the output of the other output device 21 or 11 to be output when the output circuit 1 or 2 is set to a standby system.

14 and 24 are the detection circuits 12 and 2, respectively.
This is a second control circuit that releases the settings of the operating system of the device 1 or 2, respectively, in response to the detection signal 2.

(Function) That is, for example, when one device 1 is set to the operating system, the first control circuit 13 of the device 1 sends out the output of the output circuit 11 of the device 1 and outputs the output of the other device 2. The output device 21 is controlled to suppress the output of the output device 21, and when one device 1 is set to a standby system, the output device 21 of the other device 2 is controlled to suppress the output of the output circuit 11 of the device 1. control to send out the output of

In addition, when the detection circuit 12 detects an abnormality in the output circuit 11 while one device 1 is sending out a signal as an operating system, the second control circuit 14 cancels the setting of the operating system of the device do.

〔Example〕

Hereinafter, the gist of the present invention will be specifically explained using examples.

FIG. 2 is a block diagram of an embodiment of the present invention, in which the first control circuits 13 and 23 each have two make contacts (actl
The second control circuit 1 is constructed of relays 8 CT1 and ACT2 having (act21 and act22) and resistors R1 and R2 provided between the power supply and the second control circuit 1.
4 and 24 are break contacts a1ml and a1m2, respectively.
It is composed of relays ALMI and AlH3 with

15 and 25 are switches for setting the priority of the operating system, and in the illustrated example, the priority of the operating system is given to the device 1.

Reference numeral 3 designates a relay that closes its contacts several seconds after the power is turned on, in order to prevent an inrush current in the power supply filter (1), which is not shown.

Note that the detection circuits 12 and 22 are connected to the output device 11, respectively.
・The terminal 106 is configured so that the terminal 206 is grounded when an abnormality of 12 is detected.

In addition, the two devices 1 and 2 have terminals 101 to 104, respectively.
・Connected as shown through 201 to 204・
Outputs are sent from terminals 101 and 201.

Next, the switches 15 and 25 switch the device 1 as shown in the figure.
The operation of system switching will be explained in the case where the priority of the active system is given to the system.

First, when the power is turned on with the output circuits 11 and 21 in normal condition, the relay AL is connected because the terminal 106 is not grounded.
MI does not operate, so relay ACTI operates and the output of output circuit 11 is connected to terminal 1 by make contact actl.
Sent from 01.

At this time, since relay 3 is not closed yet, relay ACT2 of the other device 2 does not operate, and then relay 3
Even if the terminal 202 is closed, the relay ACT2 does not operate because the terminal 202 is grounded.

If an abnormality occurs in the output circuit 11 in such a state.

Since the terminal 106 of the detection circuit 12 is grounded, the relay AL
The old is activated and the relay ACTI is deactivated and the make contacts actll and act12 are opened, resulting in.

Relay ACT2 of the other device 2 operates and meter contact a
ct21 is closed and the output of the output circuit 22 is connected to the terminal 201.
Sent from

Next, when the power to the device 1 is turned off and the power is turned on after repairing the failure in the output circuit 11, one device 2 continues to operate as an active system and the other device 1) as a standby system.

〔Effect of the invention〕

As explained above, according to the present invention, since the first device and the second device have exactly the same configuration, the system switching circuit of the duplex device can be configured with two devices of one type, thereby reducing costs. can be measured.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the principle of the present invention. FIG. 2 is a configuration diagram of an embodiment of the present invention. FIG. 3 shows a block diagram of a conventional example. In the figure. 1 and 2 are two devices with the same configuration. 11 and 21 are output circuits, and 12 and 22 are detection circuits. 13 and 23 are first control circuits. 14 and 24 are second control circuits. 7. Collar of invention, (Sato de Q. Reno drawing) Picture 1 Diagram Figure 2 = Aya [rice? For Ushio 1 Bootsk Figure 3

Claims (1)

[Scope of Claims] A system switching circuit provided in each device (1, 2) of a duplexing device that switches two devices (1, 2) having the same configuration so that one is an active system and the other is a standby system. , an output circuit (11, 21) that outputs a signal, and an output circuit (11, 21) that outputs a signal.
a detection circuit (12, 22) that detects an abnormality in the output circuit (11 or 21), and a detection circuit (12, 22) that detects an abnormality in the output circuit (11 or 21) when the device (1 or 2) is set to the operating system; 21 or 11), and when the device (1 or 2) is set to the standby system, the output circuit (11 or 21) is controlled to suppress the output of the output circuit (11 or 21), and the other output device (21 or 1
A first control circuit (13, 23) that controls the output of 1) to be transmitted, and a detection signal from the detection circuit (12, 22) to cancel the setting of the operating system of the device (1 or 2). A system switching circuit for a duplexing device, characterized in that it comprises a second control circuit (14, 24).