Input sampling device and method thereof

Abstract

The invention discloses an input sampling device and a method thereof; the device comprises a system I, a system II, one and more safe input circuits, a module I, a module II and a clock circuit. Each safe input circuit comprises an encoding circuit; the clock circuit is respectively connected with the system I and the system II; under the control of synchronous signals output by the clock circuit, the system II outputs a code sequence and a reference clock signal to the module I, the module II and the encoding circuit; the encoding circuit inputs an external level input signal and the output encoding signal of the system II or a previous level of encoding circuit output signal; the encoding circuit is connected with the module I; and the module I converts the serial connection of the encoding circuit output signal into parallel connection and outputs the same to the system I, and meanwhile a digital signature signal is inlaid in. According to the invention, a response fault-safety strategy is adopted, mixed encoding is carried out to acquired external signals, so that the safety and the reliability of digital quantity input acquisition and communication processes, the failure identification rate and the safety level of the system are improved, quick fault identification and fault avoidance to dangerous failure can be carried out.

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 switching signal input sampling device and a method thereof applied to a railway safety monitoring system, which are widely used in train control of railway locomotives, urban rail transit, subways, etc. The train interface unit of on-board equipment and other digital input 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] Existing technical solutions are generally based on optocouplers and relays, and without adopting the concept of fault-oriented safety, it is difficult to quickly identify faults and avoid errors for dangerous failures, that is, the system failure recognition rate is low, and the safety integrity level lower

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