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Programmable logic controller

A technology of programming logic and controller, applied in the direction of instruments, program/content distribution protection, digital data authentication, etc., can solve problems such as data change, and achieve the effect of preventing information from being rewritten

Active Publication Date: 2015-03-18
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the data recorded in the device may be changed due to misoperation

Method used

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  • Programmable logic controller
  • Programmable logic controller
  • Programmable logic controller

Examples

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Embodiment approach

[0022] figure 1 It is a figure which shows the structure of embodiment of the programmable logic controller which concerns on this invention. The programmable logic controller 1 has an authentication function unit 5 , an authentication information storage unit 4 , an encryption filter 3 , and a device 2 .

[0023] The authentication function part 5 performs authentication processing based on a user name and a password. User names and passwords are registered in the authentication information storage unit 4 in advance. When accessing the device 2 , the user name and password input by the user are compared with the user name and password registered in the authentication information storage unit 4 . The authentication function unit 5 determines that the authentication is successful when the comparison results match, and determines that the authentication fails when the comparison results do not match. When it is judged that the authentication has failed at the time of reading ...

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Abstract

This programmable logic controller comprises: a device (2) that stores data; an authentication information storage unit (4) that stores authentication information; an authentication function unit (5) that performs user authentication on the basis of the authentication information; and an encryption filter (3) that includes a plurality of encryption patterns (311-31n), one of which is set in advance by a user for encryption processing. The authentication function unit (5) performs user authentication when there is a request from an external instrument to write data into the device, and if the user authentication is successful, the authentication function unit makes the encryption filter (3) perform encryption processing on the data to be written into the device (2) by using the encryption pattern (311-31n) set in advance by the user, and then writes the data into the device (2). If the user authentication fails, the authentication function unit makes the encryption filter (3) perform encryption processing on the data to be written into the device (2) by using an encryption pattern (311-31n) that is different from the pattern set in advance by the user, and then writes the data into the device (2).

Description

technical field [0001] The present invention relates to programmable logic controllers. Background technique [0002] The so-called programmable logic controller device (device) is installed in order to store data mainly related to manufacturing, such as control information of machine tools and manufacturing equipment, recipe information such as temperature and proportion of materials in the equipment, etc. Memory within a programmable logic controller. [0003] This device can be freely written and read by the user using a computer equipped with a programmable logic controller programming tool, a monitor tool, etc., and other external input and output devices corresponding to the programmable logic controller. out. By using an information system unit or the like, writing and reading can be performed in the same way even via a network. [0004] A device for a programmable logic controller can also be read and written by a program running on the programmable logic controll...

Claims

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Application Information

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IPC IPC(8): G06F21/31G06F21/60G06F21/78
CPCG06F21/602G06F21/78G06F21/31G06F21/00G06F21/60G06F21/10G06F21/71G06F21/62G06F21/30G06F21/606G06F21/32
Inventor 川口麻美
Owner MITSUBISHI ELECTRIC CORP
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