JPH0567989A - Changeover system - Google Patents

Abstract

PURPOSE:To avoid production of undesired changeover, switch-back at N:1 changeover and to revise setting number of active and standby devices. CONSTITUTION:When a fault takes place in any of circuits 1, 2 being active circuits in the initial state, a control circuit 18 gives a selection signal 12 to a selection circuit 20 to select a circuit 3 having been a standby circuit in the initial state and the circuit having the fault is set to the standby circuit and the standby circuit 3 is set to the active circuit. Moreover, a control signal 19 is given to the control circuit 18 externally to revise number of active and standby circuits.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching system, and more particularly to a switching system for a plurality of working circuits.

[0002]

2. Description of the Related Art A conventional switching method is, for example, N = 3.
When M = 2 and S = 1, as shown in FIG. 3, out of N circuits 1 to 3 having the same function, specific M circuits 1 and 2 are used, and S The circuit 3 is fixedly set to each spare, and the connection of the selection circuit 9 in the normal state is as follows.
Input signal 4 is connected to circuit 1 and input signal 5 is connected to circuit 2. The output signal 13 is connected to the circuit 1 and the output signal 14 is connected to the circuit 2. In the case where one of the working circuits 1 and 2 has a failure, and when the switching is instructed by the control signal 19 from the outside, in order to temporarily substitute that function for the spare circuit 3, the control circuit The selection signal 12 is applied to the selection circuit 9 from 8 to input signals 4, 5
The connection destination of either one of the output signals 13 and 14 is changed to the circuit 3.

[0003]

In this conventional switching system, one of the working circuits fails or a spare circuit takes over its function by control, and then the system connection is restored to a normal state. In case of attempting to do so, or in case of returning the standby circuit to the standby state in preparation for the next failure, it is necessary to switch back to the circuit which has been switched to the standby side and which is fixedly set to the current one. Therefore, there is a problem that unnecessary switching occurs. In addition, since the current and spare circuit settings are fixed, for example, when the circuit used as the current system in the initial system configuration is no longer needed and is used as a spare, or when the initial system configuration is used as a spare circuit There is also a problem in that the system settings need to be changed drastically when the existing circuit is to be used for expansion or other purposes.

[0004]

A switching method according to the first aspect of the present invention provides N (N ≧ 3) circuits having the same function and M (N> M ≧ 2) input signals. Occurrence of a failure in N circuits, which is a selection signal for selecting which one of the N circuits having the same function is to be input and which one of the N output circuits of N circuits is to be output. It is generated in response to an alarm or a control signal from the outside, and in the initial state, M of the N circuits are actually used, and S (N> S ≧ 1) are set to the standby state as a standby state. If any one of the M active circuits is replaced with the spare circuit according to the selection signal, the control circuit resets the active and spare circuits according to the replacement, and the selection circuit. Depending on the signal, the M input signals can be converted to M And a selection circuit for selecting whether to output which the M of the N output if and N the circuit input to.

The switching method of the second invention is N (N ≧
2) A circuit having the same function and M (N ≧ M ≧ 1) input signals are input to any one of the N circuits.
A selection signal for selecting which of M outputs from the N output circuits is generated according to a failure occurrence alarm of the N circuits or a control signal from the outside, and an initial state and operation. A control circuit capable of arbitrarily changing the set number of each of the M actually used out of the N circuits in the state and the S (N> S ≧ 1) spares in the standby state; According to the selection signal, it is selected which M of the N circuits the M input signals are input to, and which M of the N outputs of the N circuits are output. And a selection circuit.

[0006]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the first invention of the present invention, in which N circuits (N = N) having the same function are provided.
3), there are M circuits (M = 2) that are set to be active in the initial state, and S circuits (S =
The case of 1) is illustrated.

In the initial state, the control circuit 18 sets which circuit is to be used as a working circuit or a spare circuit, that is, which circuit to connect an input signal and an output signal to. In this embodiment, in the initial state, the working circuits are circuits 1 and 2, the spare is circuit 3, and the input signal 4 and the output signal 13 are circuit 1.
And select signal 12 from control circuit 18 to connect input signal 5 and output signal 14 to circuit 2.
Give to 0. As a result, the circuit 3 designated as the spare is
It is not connected and enters the standby state.

After that, if an alarm is issued in the circuit 2 and an alarm signal 16 is issued, or if an external control signal 1 is issued.
When an instruction to switch the circuit 2 to the spare is input by 9, the control circuit 18 connects the input signal 5 to the circuit 3,
The output of the circuit 3 is connected to the output signal 14. Along with this, the circuit 2 is disconnected. At the same time, the control circuit 18 resets the circuit 2 set as the working state in the initial state as a spare and the circuit 3 set as the standby state in the initial state as the working state.

In this state, if a new alarm is generated or switching is performed by external control, the circuit 2 is switched to.

FIG. 2 is a block diagram showing an embodiment of the second invention of the present invention.

In the initial state, the control circuit 18 sets the circuits 1 to 3 to the working or standby mode. In this embodiment, in the initial state, the working circuits are circuits 1 and 2, the spare is circuit 3, and the input signal 4 and the output signal 13 are connected to the circuit 1, and the input signal 5 and the output signal 14 are connected to the circuit 2. The control circuit 18 supplies the selection signal 12 to the selection circuit 30. The circuit 3 designated for backup is not connected and is in a standby state.

After that, if an input signal and an output signal are added by changing the system, the added input signal 21 is connected to the circuit 3 and the output of the circuit 3 is connected to the added output signal 22. The control circuit 18 selects the signal 12 from the control circuit 18 by applying the control signal 19 from the outside.
Send to 0 and control switching. At the same time, the control circuit 18 changes the setting of the circuit 3 from the spare mode to the working mode according to the control signal 19 from the outside. On the contrary, when the input signal 5 and the output signal 14 are not necessary due to the system change, the control circuit 18 controls the circuit 2 by disconnecting the circuit 2 and changing the setting of the circuit 2 to the preliminary setting. As a result, the system configuration is changed to have two spare circuits for the current circuit 1.

[0014]

As described above, according to the present invention, the current and standby settings are reset at the same time as the switching, so that the conventional re-switching for returning to the standby state becomes unnecessary. Further, by providing the function of arbitrarily changing the number of circuits set for the current use and the spare, it is not necessary to drastically change the system configuration as in the past.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the first invention of the present invention.

FIG. 2 is a block diagram showing an embodiment of the second invention of the present invention.

FIG. 3 is a block diagram showing a conventional switching method.

[Explanation of symbols]

 1-3 circuits 8,18 control circuit 9,20,30 selection circuit

Claims (2)

[Claims] 1. N (N ≧ 3) circuits having the same function and M (N> M ≧ 2) input signals are input to any of the N circuits having the same function. Then, a selection signal for selecting which of the N output circuits of the N circuits to output is generated in response to a failure occurrence alarm of the N circuit circuits or an external control signal, and an initial state. In N, M of the circuits are actually used, and S (N> S ≧ 1) are set as a standby state, and any one of the M currently used circuits is selected. A control circuit for resetting the current and spare circuits when the circuit is replaced with a spare circuit according to a signal, and N input circuits for the M input signals according to the selection signal. Which of the M outputs to input and N outputs of the N output circuits And a selection circuit for selecting which of M lines to output. 2. N (N ≧ 2) circuits having the same function and M (N ≧ M ≧ 1) input signals are input to any one of the N circuits, and N Generating a selection signal for selecting which of M outputs from the N outputs of the circuit in response to a failure alarm of the N circuits or a control signal from the outside, and in an initial state and an operating state. A control circuit capable of arbitrarily changing the set number of each of the M actually used and the S (N> S ≧ 1) spares in the standby state out of the N circuits, and the selection signal A selection circuit for selecting which of the N circuits the M input signals are to be input to and which of the N outputs of the N circuits is to be output. And a switching method characterized by including.