A two-out-two fail-safe output structure detection system

Abstract

A two-out two failsafe output structure detection system, which includes a first microprocessor, a second microprocessor, an output circuit, an output drive circuit, an output drive recovery circuit, and a safety controller; the safety controller is connected to a The positive pole of the power supply and the output drive circuit, the output drive circuit controls the on-off of the output circuit, the output drive recovery circuit recovers the output drive circuit to obtain two recovery signals, the first microprocessor, The second microprocessor controls the on-off of the output drive circuit and receives the recovery signal and votes to output a first feedback control signal to the safety controller, and the safety controller receives the first feedback control signal and Control itself on or off. The invention realizes the test of the switching ability of the output driving circuit by recovering the output driving circuit; at the same time, by detecting the contact point of the safety relay and the output relay, the wrong output caused by mixed lines is avoided.

Description

technical field [0001] The invention relates to the technical field of automatic safety control, in particular to a two-out-two failsafe output structure detection system. Background technique [0002] Most of the current safety control systems are computer-controlled systems. Once the system fails to work normally, it may output dangerous control signals to the controlled equipment, resulting in casualties and property losses. Therefore, railways, nuclear power, petrochemical and other fields will inevitably involve the issue of safety output, and the accuracy and reliability of safety output directly play a decisive role in the entire control system. [0003] At present, the common structure of fail-safe output is 2 out of 2 and 3 out of 2 structures. Generally, only combined fail-safe technology is used, and the safety measures are relatively single, lacking multiple guarantees. [0004] In the existing technology, there is a hidden danger of mixed line output in the on-...

AI Technical Summary

Problems solved by technology

[0003] At present, the common structure of fail-safe output is 2 out of 2, 3 out of 2 structure, and only combined fail-safe technology is generally used, and the safety measures are relatively single, lacking multiple guarantees

[0004] In the existing technology, there is a hidden danger of mixed line output in the on-site control equipment, that is, the protection function of the wrong output caused by the mixed connection of the lines is very weak. Once the lines are mixed, if there is output, there is a risk, causing the relay that should not be picked up , resulting in misoperation, if such misoperation occurs in the turnout, it will cause misoperation of the turnout, and the consequences are very serious

[0005] In the existing technology, there are defects in the detection, and the recovery of the output is completed by its own processor, and the wrong collection caused by the system error of the microprocessor itself cannot be avoided.

At the same time, the design of self-inspection of its own circuit lacks real-time performance, and the existence of faults cannot be found in the first time

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