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Redundant control device

A control device and dual system technology, applied in general control systems, control/regulation systems, electrical testing/monitoring, etc., to achieve the effects of shortening the cycle, improving the safety level, and expanding the scope

Inactive Publication Date: 2012-09-05
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the conventional dual system control device, since the self-diagnosis is performed while controlling the factory, there is a problem that there will be an area where the self-diagnosis cannot be performed, such as the main memory, and this part can only be maintained offline during regular maintenance. make a diagnosis

Method used

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Examples

Experimental program
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Embodiment approach 1

[0024] Next, Embodiment 1 of the dual system control device according to the present invention will be described with reference to the drawings. figure 1 It is a schematic configuration diagram of the dual system control device in Embodiment 1 of the dual system control device according to the present invention. figure 1 In , the dual system control device is duplexed by the A system as the control system and the B system as the other control system. These control systems A and B respectively include CPUs 1A, 1B that perform arithmetic processing, etc., memories 2A, 2B connected to these CPUs, and input control units 3A, 3B connected to each CPU and that transmit input information from controlled objects to these CPUs. , and the output control units 4A, 4B that control the output information of the output control device 7 . By connecting these input control units 3A and 3B and output control units 4A and 4B to a switching device 5 that performs system switching based on a s...

Embodiment approach 2

[0028] Hereinafter, Embodiment 2 of a dual-system control device according to the present invention will be described focusing on portions different from Embodiment 1 with reference to the drawings. Figure 4 It is a schematic configuration diagram of a dual system control device in Embodiment 2. In addition to the configuration of Embodiment 1, a data communication line 8 connected between CPUs 1A and 1B is included. The diagnosis status of the self-diagnosis system is referred to between the two systems A and B via the data communication line. The self-diagnosis system sets a flag for this diagnosis state, and when the diagnosis is completed, it is regarded as "diagnosis completed", and when the diagnosis is in progress, it is regarded as "diagnosis in progress".

[0029] Next, the operation of the dual-system control device will be described focusing on the differences from the first embodiment. Figure 5 It is a conceptual diagram showing the outline of operations in Emb...

Embodiment approach 3

[0032] Hereinafter, Embodiment 3 of a dual-system control device according to the present invention will be described focusing on portions different from Embodiment 2 with reference to the drawings. Figure 7 It is a flowchart in Embodiment 3 of the dual system control apparatus concerning this invention. and Image 6The difference is that when the self-diagnosis system detects an abnormality through self-diagnosis, it notifies the actual control system that an abnormality has occurred. That is, when system B performing self-diagnosis as a self-diagnosis system detects an abnormality in its own system through self-diagnosis (S302), it notifies system A of the actual control system via the data communication line 8 of the abnormality (S303). System A completes a series of control processes, and refers to the operating state of system B, but in the case of an abnormality, does not issue a system switching instruction, and continues control processes sequentially (S01). If the ...

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PUM

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Abstract

Disclosed is a redundant control device, comprising a control assembly (A) further comprising an auto-diagnostic function; and another control assembly (B), further comprising an auto-diagnostic function, and which is made redundant with the control assembly (A). When one of the two control assemblies operates in an actual control assembly mode upon an object to be controlled, the other control assembly operates in an assembly mode that carries out auto-diagnostics, and the actual control assembly and the assembly carrying out auto-diagnostics are mutually interchanged such that both assemblies respectively carry out auto-diagnostics and diagnose regions whereupon auto-diagnostics could not otherwise be carried out when operating in control assembly mode.

Description

technical field [0001] The invention relates to a plant control device, for example for a power station or the like. Background technique [0002] In general, in a factory control device of a conventional redundant standby configuration, self-diagnosis for detecting an abnormality of the control device is performed. This self-diagnosis is performed by judging abnormalities in hardware or software of the own system, abnormalities in the upper and lower limits of input signals, abnormalities in calculation results, and the like. In particular, in a control device with a dual structure, such as Figure 10 As shown, in general, system switching is performed when an abnormality detection in any one of the dualized control systems is triggered. Patent Document 1 describes a dual system control device based on such a switching condition (for example, Patent Document 1). [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open...

Claims

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Application Information

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IPC IPC(8): G05B9/03G05B23/02G06F11/20
CPCG05B9/03G06F11/202
Inventor 饭田　烈弘
Owner MITSUBISHI ELECTRIC CORP
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