JPH03216048A - Redundancy system automatic starting system - Google Patents

Abstract

PURPOSE:To preclude the possibility of redundancy system information in error while a redundancy system is recovered in the redundancy system exchange by providing a memory storing the state of the redundancy system. CONSTITUTION:The system is provided with a system state change detection circuit 2 detecting a change in a command state of a system command circuit 1, a power-on detection circuit 6 detecting application of power, a nonvolatile memory 4 as a memory storing the state of the redundancy system set in a redundancy switching section and storing the detection output of the system state change detection circuit 2 and the power-on detection circuit 6 and a system setting section supplying the information relating to the redundant system commanded by the system command circuit 1 to the redundancy switching section and automatically receiving the information relating to the redundancy system stored in the nonvolatile memory 4 based on power application information by the power-on detection circuit 6 even when a project signal preventing the switching of the redundancy system by the system command circuit 4. Thus, the redundancy switching information is automatically restored by power-on even in the project state in the redundancy system exchange and the redundancy switching control section is replaced without interrupting the redundancy information.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a redundant system automatic start-up system, and in particular to a system for automatically starting up a redundant system, and in particular for logic systems configured using individual electrical components such as communication devices and digital computers that apply digital logic circuits. This invention relates to a system for automatically starting up a redundant system for a digital circuit having a redundant system configured using logic circuits configured as circuits or integrated circuits.

[Conventional technology]

Digital circuits with redundant systems are widely used. The redundant system provided to give reliability to such digital circuits is used to ensure normal operation by replacing the redundant system in the event of a malfunction in the circuit operation. It will be replaced with a new one and will once again function as a normal redundant system.

Generally, when replacing a configuration forming a redundant system, the inside of the device is placed in a project state. In the device placed in this project 1 state, redundancy information for setting redundancy is held in each redundancy switching unit, and after canceling the project state, the redundancy information is read from the CPU or memory and the redundancy control unit is restored. It was done in a way that

[Invention or problem to be solved]

In the conventional redundant system replacement described above, the CPU sets redundant information after the project is canceled, so there is a drawback that the redundant system information may become incorrect until the redundant system is restored. .

[Means to solve the problem]

The redundant system automatic start-up method of the present invention includes a system instruction circuit that instructs a redundant system to be switched via at least one redundancy switching section under the control of a redundancy switching control section, and an instruction for the system instruction circuit section. a system state change detection circuit that detects a change in state;
a power-on circuit for turning on power to operate the redundant switching unit; a power-on detection circuit for detecting power-on by the power-on circuit; and a power-on detection circuit for storing detection outputs of the system state change detection circuit and the power-on detection circuit; a memory that stores the state of the redundant system set in the redundant switching unit;
Supplying information regarding the redundant system instructed by the system instruction circuit to the redundancy switching unit, and receiving a project signal for preventing redundant system switching by the system instruction circuit, based on power-on information from the power-on detection circuit. and a system setting unit that automatically disseminates information regarding the redundant system stored in the memory.

Further, the redundant system automatic start-up system of the present invention has a configuration in which the memory is a nonvolatile memory.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. In the embodiment shown in FIG. 1, power is turned on to operate a system instruction circuit 1 that instructs a redundant system, a system state change detection circuit 2 that detects a change in the instruction state of the system instruction circuit 1, and a redundancy switching section. A power-on circuit 5, a power-on detection circuit 6 that detects power-on by the power-on circuit 5, and a redundant system that stores the detection outputs of the system state change detection circuit 2 and the power-on detection circuit 6 and is set in a redundancy switching section. A non-volatile memory 4 serves as a memory for storing the state of A system setting unit 3 automatically disseminates the information regarding the redundant system stored in the nonvolatile memory 4 based on the power-on information from the power-on detection circuit 6 even when the power-on detection circuit 6 is turned on. Control unit 100
and redundancy switching unit 101 are also shown together.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

Redundant system switching during normal operation of the device is set in the yarn setting section 3 by a system instruction signal 11 upon receiving an instruction from the system instruction circuit 1. On the other hand, the system instruction signal 11 is also supplied to a system state change detection circuit 2 that monitors information on the redundant system, and is used as a write signal 41 to rewrite the changed contents in the nonvolatile memory 4 each time the redundant system changes. Address 42 is output and system selection signal 31 is written. In this way, the latest redundant system information is always stored in the nonvolatile memory 4.

In order to replace a defective redundant system with a non-defective one, when replacing the redundant switching control unit 100, the device is normally in the project state by the project signal 7, and information regarding the redundant system is retained in each redundant switching unit. are doing.

When the power is turned on to the redundancy switching control unit 100, the power-on circuit operates, and the power-on detection circuit 6 outputs a read address 44 and a continuation signal 43 that designate the address of redundant information to be read from the nonvolatile memory. . The data in the nonvolatile memory 4 is input to the system setting section 3. At the same time, the power-on detection circuit 6
A system set signal 61 is output to. This system set signal 61
is more effective than project signal 7. Therefore, the nonvolatile redundant information of the memory 4 is set in the system setting unit 3 via the data bus 45, and the system information is automatically restored.

〔Effect of the invention〕

As explained above, the present invention automatically restores the redundant switching information when the power is turned on even in the system state during redundant system replacement, thereby allowing the redundant switching control unit to be replaced without cutting off the redundant information. 1.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... System instruction circuit, 2... State change detection circuit section, 3
... System setting unit, 4... Nonvolatile memory, 5... Power-on circuit, 7... Project signal, 6... Power-on detection circuit section, l1... System instruction signal, 31.・
- System selection signal, 41... Write signal, 42... Write address, 43... Read signal, 44... Read address, 45... Data path, 61... System set signal.

Claims (1)

[Claims] 1. A system instruction circuit for instructing a redundant system to be switched via at least one redundancy switching section under the control of a redundancy switching control section, and a change in the instruction state of the system instruction circuit section. a system state change detection circuit that detects a system state change detection circuit; a power-on circuit that turns on power to operate the redundant switching section; a power-on detection circuit that detects power-on by the power-on circuit; a memory that stores the detection output of the on-detection circuit and stores the state of the redundant system set in the redundancy switching unit; and a memory that supplies information regarding the redundant system instructed by the system instruction circuit to the redundancy switching unit; a system setting unit that automatically disseminates information regarding the redundant system stored in the memory based on power-on information from the power-on detection circuit while receiving a project signal to prevent switching of the redundant system by the system instruction circuit; A redundant system automatic start-up system characterized by: 2. The redundant system automatic start-up system according to claim 1, wherein the memory is constituted by a non-volatile memory.