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computer device

A computer device and computing device technology, applied in the direction of protecting storage content from loss, etc., can solve the problems of reduced memory usefulness and inability to connect batteries, and achieve high-speed access, control processing, and large-capacity control processing.

Active Publication Date: 2017-12-12
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, as a rechargeable backup unit, there are primary batteries and secondary batteries, but depending on the environment of the place where the controller is installed, these batteries may not be connected, and as a result, the usefulness of the nonvolatile memory decreases.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0058] figure 1 It is a block diagram showing the internal configuration of the controller according to this embodiment.

[0059] A general controller 1 is composed of an arithmetic unit 2 and a memory 3. The arithmetic unit 2 executes various calculations with reference to the memory 3, and also appropriately transmits and receives control information to and from external devices.

[0060] Although not shown in the figure, the controller 1 is provided with a control power supply. In addition, a rechargeable backup unit Bat is sometimes connected as a backup when the control power source is lost. In the present invention, there is a feature that it is possible to cope with a power failure regardless of the presence or absence of the rechargeable backup unit Bat.

[0061] Various storage units are provided in the memory 3 . In the illustrated example, the processing speed of data rewriting and erasing is high-speed, but the data will be erased when the power is turned off. T...

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PUM

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Abstract

The present invention provides a computer device capable of implementing a control program implementation method independent of the presence or absence of a rechargeable backup unit. The computer device has a memory including a nonvolatile memory and a volatile memory, and an arithmetic device, and the operation device executes the control program described in the control program table of the memory, and the computer device is characterized in that the nonvolatile The first control program table is provided in the memory, and the second control program table is provided in the volatile memory. When the power is turned on, it is confirmed whether there is a rechargeable backup unit and the first control program table and the second control program table are used preferentially. Which one, when the rechargeable backup unit is not connected and the second control program table is used, the content of the first control program table is transcribed into the second control program table, and during the operation according to the second control program table, every For each determined control period, the contents of the second control program table are transcribed into the first control program table.

Description

technical field [0001] The present invention relates to, for example, a computer device such as a controller used in a plant monitoring and control system for monitoring and controlling sewer and sewage plants. Background technique [0002] In recent years, computers used in plant monitoring and control systems have been able to achieve high-speed calculations using large-capacity calculation programs due to the development of large-capacity memories and improvements in the calculation performance of processors. [0003] Among them, controllers such as PLC (Programmable Logic Controller) can realize monitoring and operation of many control equipment with one unit, and from the perspective of maintenance of complete equipment, low cost and high efficiency are also advancing. . [0004] As a background art in this technical field, there is Patent Document 1. In Patent Document 1, a controller with a rechargeable backup unit, a volatile main memory, and a nonvolatile backup m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F12/16
Inventor 畑秀太朗原直树小野里登
Owner HITACHI LTD
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