PLC safety monitoring method based on bypass information
A technology of safety monitoring and safety monitoring system, which is applied in the field of PLC safety monitoring based on bypass information, can solve the problems of inability to transplant traditional information field safety protection means, no effective security means, etc.
Active Publication Date: 2016-06-08
ZHEJIANG UNIV
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[0004] Programmable logic controller (PLC) is a key device in industrial control systems. Due to the limitations of hardware structure and software system, it is impossible to transplant security protection methods in the traditional information field. At present, there is no effective security protection method designed for PLC characteristics.
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[0042] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. The way the invention is deployed is in the attached figure 1 , see the attached hardware composition figure 2 .
[0043] Concrete embodiment of the present invention: take the S7-300 type PLC produced by Siemens as the experimental object to test the method proposed by the present invention, use the 15FR100E type 0.1 ohm wirewound resistance of OHMITE company as the connection between the power supply and the PLC Sampling resistors, while using the U2541A high-speed data collector produced by Agilent to collect real-time power consumption data.
[0044] Make the PLC run eight different PLC programs, that is, perform eight different jobs, use the data collector to collect different power consumption information generated when the PLC runs different programs at a fixed sampling rate, and divide the collected power consumption data , ...
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The invention discloses a PLC safety monitoring method based on bypass information. Safety monitoring of the current work of a PLC is achieved by analyzing power consumption bypass information. A sampling resistor is connected into a power supply circuit of the PLC in series, a high-speed data collection device is used for obtaining real-time power consumption information generated when the PLC runs, feature information capable of reflecting current work of the PLC is worked out according to the obtained power consumption information, according to the obtained feature information, a classifier is constructed through an SVM algorithm, and the current work of the PLC is effectively recognized. The hardware structure is simple, hardware and software systems of an industrial control system do not need to be modified, normal running of the industrial control system is not affected, and meanwhile safety monitoring of the PLC can be achieved with the high accuracy rate.
Description
technical field [0001] The invention relates to a safety monitoring method, in particular to a PLC safety monitoring method based on bypass information. Background technique [0002] An industrial control system operating in an isolated manner, using dedicated equipment and protocols and relatively isolated from the external physical environment, is relatively safe for a long period of time. However, in order to meet the ever-increasing management requirements of enterprises and follow the trend of deep integration of informatization and industrialization, with the rapid development of information technology and the Internet of Things in recent years, information technology has been widely used in industrial control systems. The "integration of industrialization and industrialization" has brought about a great increase in productivity, but at the same time it has also brought huge security problems to the industrial control system. Due to the access of the external network, ...
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IPC IPC(8): G05B19/05
CPCG05B19/058G05B2219/14006
Inventor 徐文渊王灏然
Owner ZHEJIANG UNIV