Switching quantity output device and method thereof

Abstract

The invention discloses a switching quantity output device and a method thereof, and the device and the method are applied to the switching quantity signal outputting of a railway safety monitoring system; the device comprises a system I, a system II, a module I and a safety output circuit; the module I comprises an encoding circuit, a parallel-to-serial circuit and a clock circuit; under the control of a synchronous signal output by the clock circuit, the system II outputs a periodic signal SIG_2 with a fixed code sequence, and the system I outputs a parallel signal which is complementary with the signal; the module I converts the parallel signal into a signal SIG_1 which is complementary with the signal SIG_2; the two signals are compared in the safety output circuit; and whether a system is on a guiding safety side or not is determined by comparing and controlling the on and the off of a power supply in the safety output circuit. According to the invention, fault guiding safety is realized by adopting a combined fault-safety strategy and dynamic control output, so that the safety and the reliability in digital quantity outputting are improved, meanwhile faults can be quickly identified, error avoidance is carried out to dangerous failure, and the safety level of the system is improved.

Description

technical field [0001] The invention relates to a safety monitoring device and a method thereof in the field of rail transit, in particular to a switch signal output device and a method thereof applied to a railway safety monitoring system, which are widely used in train control vehicles such as railway locomotives, urban rail transits, subways, etc. The train interface unit of the equipment and other digital output systems that require high safety and reliability. Background technique [0002] With the vigorous development of rail transit, the safety of transportation is becoming more and more important. Correspondingly, rail traffic control and protection system products are required to have high safety and high reliability. Therefore, it is necessary to adopt necessary safety strategies according to requirements during design, so that The product complies with safety requirements, including safety function requirements and safety integrity level requirements. The actual ...

AI Technical Summary

Problems solved by technology

[0006] The existing technical solutions do not adopt the concept of fault-oriented safety, so it is difficult to quickly identify faults and avoid errors for dangerous failures, that is, the failure recognition rate of the system is low, and the safety integrity level is low

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