A PLC safety real-time monitoring method and system

A real-time monitoring and security technology, applied in general control systems, control/regulation systems, program control, etc., it can solve the problems of inability to detect abnormal input and output configuration and protection, and achieve protection and safety and a wide range of applications. , high security effect

Active Publication Date: 2021-02-12
ZHENGZHOU XINDA JIEAN INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method cannot detect the abnormality of the input and output configuration
In the prior art, the protection of input and output mainly considers the external protection of I / O pins, and it cannot protect against abnormalities caused by internal pin configuration changes.

Method used

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  • A PLC safety real-time monitoring method and system
  • A PLC safety real-time monitoring method and system
  • A PLC safety real-time monitoring method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a PLC safety real-time monitoring method, including a real-time monitoring module in the PLC application system, such as figure 1 As shown, the method includes the following steps:

[0051] Preparation Phase:

[0052] S1. Analyze the various inputs and outputs of the PLC, set safety detection rules according to the value ranges and associated logical relationships of the various inputs and outputs, and store the safety detection rules in the real-time monitoring module;

[0053] Run phase:

[0054] S2. When the PLC starts, the real-time monitoring module starts to run;

[0055] S3. When the PLC is in the input sampling stage, the real-time monitoring module reads the input data from the input module of the PLC, and judges whether the input data conforms to the safety detection rule; if it meets, then execute S4, if not, then execute S6;

[0056] S4. When the PLC enters the output refresh stage, and before the PLC outputs to the equipment con...

Embodiment 2

[0079] The difference between this embodiment and Embodiment 1 is that this embodiment provides another specific implementation of step S1, including:

[0080] S101. Analyze the various inputs and outputs of the PLC, determine the value ranges of the various inputs and outputs according to the physical properties of the various inputs and outputs and the requirements of the PLC application system, and form a first security rule set ;

[0081]S102. According to the application program or function design goal of the PLC, analyze the associated logical relationship between the various inputs and outputs, extract the value-taking rules corresponding to each output, and form a second security rule set;

[0082] S103. According to the first security rule set and the second security rule set, set security detection rules and store them in the real-time monitoring module.

[0083] In this embodiment, step S102 includes: according to the application program or function design goal of ...

Embodiment 3

[0085] Based on the same inventive concept as the above method, this embodiment also provides a PLC safety real-time monitoring system, such as figure 2 Shown, a kind of PLC safety real-time monitoring system comprises real-time monitoring module, and described real-time monitoring module is connected with CPU module, input module and output module of PLC respectively;

[0086] Built-in safety detection rules in the real-time monitoring module; wherein the safety detection rules are set by analyzing the various inputs and outputs of the PLC, according to the value range and associated logical relationship of the various inputs and outputs;

[0087] The real-time monitoring module, when the PLC is running, judges whether the input data read from the input module in the input sampling phase and the output data read from the output module in the output refresh phase conform to the safety detection rules within a PLC scan cycle , if they all match, the PLC will run normally, othe...

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Abstract

The invention provides a PLC safety real-time monitoring method and system. The technical scheme of the present invention analyzes the various inputs and outputs of the PLC, and sets the safety detection rules according to the value ranges and associated logical relations of the various inputs and outputs, and stores them in the real-time monitoring module; when the PLC is running, Use the real-time monitoring module to monitor the various inputs and outputs of the PLC according to the safety detection rules, and report to the police in time when abnormalities occur, so as to ensure the safe operation of the PLC system. The technical scheme of the present invention can prevent PLC safety problems caused by abnormal changes in pin configurations, and can also detect abnormalities in the process of executing programs in PLCs. Compared with existing safe PLCs, the safety protection of PLCs can be further strengthened, so that the PLC system has Greater security.

Description

Technical field: [0001] The invention relates to the field of industrial control and safety, in particular to a PLC safety real-time monitoring method and system. Background technique: [0002] The industrial control system or industrial control system is an important part of the national industrial system and key infrastructure. The security of the industrial control system is related to the country's strategic security and social stability. [0003] Since the Iranian nuclear power plant was attacked by the "Stuxnet" virus, the industrial control system has gradually become an important target for attackers. Programmable logic controller (PLC) is an important basic control device in industrial control systems, and its security issues have also received more and more attention. [0004] In November 2016, researchers Abbas and Hashemi discovered a method of exploiting vulnerabilities, even without making any changes to the PLC firmware or logic, just operate the input and ou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/05
CPCG05B19/058
Inventor 丁琦张鲁国何骏刘武忠乔少虎马骥
Owner ZHENGZHOU XINDA JIEAN INFORMATION TECH
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