A signal safety output technology and identification method

Abstract

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...

AI Technical Summary

Problems solved by technology

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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