Switching value acquisition method and device

Abstract

The invention discloses a switching value acquisition method and device. The method comprises that a signal delay unit is added in a switching value circuit, a self-checking signal is added in an acquisition circuit during acquisition, the switching value circuit performs delay processing on the self-checking signal through the signal delay unit, a self-checking feedback signal after the acquisition delay of the acquisition circuit delay, and whether the acquisition is accurate is determined through the fact that whether the delay of the self-checking feedback signal relative to the self-checking signal is a preset delay time. An acquisition loop of the switching value acquisition device comprises the acquisition circuit and the switching value circuit, wherein the acquisition circuit comprises a self-checking signal generation unit, and the switching value circuit comprises the signal delay unit. According to the switching value acquisition method and device, not only the number of external wires can be reduced, but also whether faults or mixing occurs to external cables can be determined accurately, and accordingly, the effectiveness and the accuracy of switching value acquisition are improved greatly.

Description

technical field [0001] The invention relates to the technical field of detection and control equipment, in particular to a method for collecting switching values ​​that prevents external cables from being mixed. Background technique [0002] Existing detection and control equipment, especially many detection and control equipment on railways, need to collect external switching values. These switching values ​​are crucial to the entire system. If there is an error in the collection, it is likely to cause accidents such as casualties. Therefore, On the railway, these switches that affect safety are defined as safety switches. The safety switch is generally defined as the dangerous side when the external switch is disconnected. For example, the interlock system needs to collect the node status of the external track relay to determine whether there is a car on the track. When the relay node is disconnected, it means that there is a car on the track. Therefore, safe acquisition ...

AI Technical Summary

Problems solved by technology

The defect of this method is that the dynamic signal is used for collection, which can only ensure that a stable level is collected when the components on the collection circuit fail. If the external cable is mixed, it will be mistaken for the switch to be closed, and the wrong switch information will be collected.

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