Controller local network bus type structure and digitallized rail detecting device

Abstract

A bus-type structure for controller LAN and the digitalized rail detector features that a impedance regulating link is additionally used in the receiving circuit, the TJA 1040T module is used as the communication switching unit, and two latches with serial inputs and parallel outputs and a digital display module TOM2481 are used in its multifunctional digital display unit to form a 4-digit display panel.

Description

technical field [0001] The invention relates to a detection device for detecting the idleness or occupancy status of lines in railway stations, sections, etc., and can be used as a secondary detection device for AC track sensors in signal monitoring systems such as railway signal interlocking systems, dispatching supervision, and centralized dispatching. Background technique [0002] Through the application of the digital track state detection device of the bus structure in the computer interlocking system, a series of technical problems such as real-time detection of station track occupancy and idleness, centralized interlocking control, and bus digital communication are solved. For example, Chinese patent CN2419129 is Disclosed is a digital track detection device with a bus structure. With the further popularization and application of the system and the expansion of the scope of application, the above-mentioned device shows some deficiencies; first, the design accuracy of ...

AI Technical Summary

Problems solved by technology

With the further popularization and application of the system and the expansion of the scope of application, the above-mentioned device shows some deficiencies; first, the design accuracy of the device cannot meet the needs of use, and the threshold value of the input signal cannot be uniformly set and adjusted online. The insulation status and overvoltage status of the signal circuit cannot be accurately judged, that is, the resolution of the received signal is not high; secondly, when the direct communication distance is greater than 1KM, the bus needs to be connected with a repeater

If a passive repeater is used, the signal will be significantly attenuated as the distance increases, which will reduce the anti-interference performance and affect the communication rate and reliability.

If an active repeater is used, it will increase the requirements for on-site wiring and increase the difficulty of construction, which will cause inconvenience to users; at the same time, its anti-interference performance has no obvious advantage when the bus is used in harsh environments

In the display link, two light-emitting diodes were originally used to reflect the actual occupancy status of the track, which cannot completely display parameters such as the measured value of the track input signal and the threshold value of the track condition. For the on-site maintenance personnel, the displayed information There are certain limitations and inconveniences

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