A highly reliable switch signal acquisition system and its acquisition method

Abstract

The invention discloses a high-reliability switching value signal acquisition system. The high-reliability switching value signal acquisition system comprises an acquisition link, wherein the acquisition link comprises a query power supply, a resistor B, a detected switch, a signal link, a connector, a protection circuit, an optocoupler, a Schmidt trigger and a CPU which are connected in series insequence, and also comprises a static diagnosis link; the static diagnosis link comprises an analog-digital converter and a digital isolator which are connected in series; the digital isolator is connected to the CPU; the input end of the analog-digital converter is connected to the ground end of the light-emitting diode of the optocoupler; the detected switch is connected with a resistor A in parallel, wherein the resistance value of the resistor A is larger than that of the resistor B; the dynamic diagnosis link comprises a diagnosis power supply, a switch 1, a switch 2 and a resistor C; the switch 1 is connected between the input end of the optocoupler and the protection circuit in series; the resistor C is connected with the light-emitting diode of the optocoupler in parallel; the input end of the switch 2 is connected with the diagnosis power supply; and the output end of the switch 2 is connected to the input end of the optocoupler.

Description

technical field [0001] The invention is a switch signal acquisition method designed for high security and stability of the system, specifically a switch signal acquisition circuit with novel diagnostic measures, which adopts the dynamic switching diagnosis of the isolation switch and the static real-time supervision status phase The combination method realizes the reliability of channel acquisition, which can be applied to large-scale engineering fields such as nuclear power plants, and can ensure the safety, reliability and stability of the system. Background technique [0002] In the field of industrial control, especially in the field of digital instrument control of nuclear power plants, there will be monitoring of a large number of switching signals. Therefore, a high-reliability switch acquisition method is necessary. [0003] The nuclear power field is a field that has particularly high requirements for safety and reliability, so the acquisition system must ensure sa...

AI Technical Summary

Problems solved by technology

[0005] In industrial applications, when there is no accident, the switching signal is basically in a constant state, and the circuit continues to collect a state, which may be due to device failure and other reasons. When the state should be reversed, the path cannot be recognized normally.

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