A signal safety output technology and identification method
An identification method and signal security technology, which is applied in the field of signal security output technology and identification, can solve problems such as inability to obtain input signals, mixed interference and accidents, system failure, etc., and achieve strong anti-interference, low risk of loss of control, and reduced configuration Effect
Active Publication Date: 2020-08-04
王琰
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However, from the signal output by the sensor to the execution control system, it is easy to mix various disturbances and accidents.
In occasions with reliability and safety requirements, use sensors with redundant outputs, that is, the sensors output two or more redundant signals to the control system, and identify the reliability and safety of the signals by comparing the redundant signals. However, this This method also has insurmountable shortcomings: if the sensor output signal is connected to a DC level or the sensor output is out of control and outputs a constant high level, the signal will be out of control.
If the loss of control cannot be detected immediately, when the other channel is also out of control, the executive control system will not be able to get the correct input signal, and the entire system will be at risk of failure
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[0017] refer to figure 1 , the sensing signal S of the sensor and the dynamic watermark signal M(t) get the output signal S+M(t) of the superimposed watermark signal through the signal superimposed device, and then output to the control system through the signal line, the signal superimposed waveform is as follows figure 2 shown. By superimposing the dynamic watermark signal M(t) in the sensing signal S, the identifiability, security and reliability of signal transmission and reception are increased.
[0018] The output signal S+M(t) of the legally superimposed watermark signal includes both the sensing signal S and the dynamic watermark signal M(t). The control system detects the dynamic watermark signal M(t) in the signal, and only the dynamic The received signal of the watermark signal M(t) is considered to be a legal signal, and any other S signal on the sensor output line that does not contain the dynamic watermark signal M(t) is illegal, and the control system refuses ...
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Provided are a signal safety output technology and a recognition method. A dynamic watermark signal is superimposed on a sensing signal, to obtain an output signal of the superimposed watermark signal, and the output signal is output to a control system through a signal line; the control system detects the dynamic watermark signal in the signal, and only the received signal containing the dynamicwatermark signal is considered as a legal signal, or else the signal is illegal; by controlling the amplitude of the dynamic watermark signal, the level of the dynamic watermark signal does not affectthe output signal as the level logic of the legal signal, so the logic level of the received signal can also represent the logic level of the sensing signal. Further, an input signal may be obtainedafter the output signal of the superimposed watermark signal is received, the dynamic watermark signal is filtered out, and the sensing signal is reduced. The signal contains dynamic self-test information, and only one output signal can ensure the safety and reliability of signal output by a sensor, not only is configuration of redundant output lines reduced, but also the safety and reliability ofsignal transmission and use are greatly improved, the anti-interference is higher, and the risk of losing control is low.
Description
technical field [0001] The invention relates to a signal safe output technology and identification method, which are used in the field of safety protection and industrial fields requiring reliability and safety of signals. Background technique [0002] With the implementation of the "Made in China 2025" strategy, the automation of production lines will become popular. All kinds of industrial sensors are indispensable for automated production lines. However, it is easy to mix various disturbances and accidents between the signal output by the sensor and the execution control system. In occasions with reliability and safety requirements, use sensors with redundant outputs, that is, the sensors output two or more redundant signals to the control system, and identify the reliability and safety of the signals by comparing the redundant signals. However, this This method also has insurmountable shortcomings: if the sensor output signal is connected to a DC level or the sensor ou...
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IPC IPC(8): G05B19/04
CPCG05B19/04
Inventor 王琰
Owner 王琰
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