Computer

Abstract

The invention provides a computer of the implementation method without depending on the presence of the chargeable backup unit. The computer comprises a storage device including a non-volatile storage device and the volatile storage device and a computation device. The computation device executes the control program recorded in the control program list of the storage device; the computation device is characterized in that the non-volatile storage device has the first program control list, the volatile storage device has a second control program list, when the power supply is connected, confirm with no charging unit is installed and the priority use of control program table 1 and table 2 control program which, when there is no connection control unit and USES 2 rechargeable backup schedule, transcription of the content of the control program table 1 to 2 control procedures, in the table in the table according to control procedures for operation period, according to each decision control cycle, transcription of the content of the table 2 control program to control program in the table 1.

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...

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.

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