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England from 1984 started to develop computer-based interlocking system, at present, as the core railway transportation safety control system, replacing the original 6502 Electric, but with the large-scale development of computer interlocking system also exposed more and more problem. Since many computer-based interlocking system retains nearly 30% of the relay circuit, complex structure, large area, multi-wire, solder joints, this causes high failure rate, anti-interference ability is weak, while interlocking software out of the intellectual property protection considerations, is completely closed, for interlocking software correctness, security, not in-depth control. Software testing is only limited to functional testing, black box testing, the test can not be exhaustive range of functions.
The development of a computer-based interlocking requirements and development
1.1 Computer Interlocking development requirements
To ensure that rail transport leaps and bounds, give full play to the railway signal factories, engineering units, specialized construction units, electrical service maintenance units role in ensuring the basic security conditions, based on the computer-based interlocking system allows multi-level units become widely participate to achieve an open interlock devices. Computer interlocking system of the ideal state is: ① complete factory production; ② completely standardized design; ③ most simplified construction site; ④ most simplified acceptance mode; ⑤ most simplified maintenance approach; ⑥ most simplified maintenance tools; ⑦ easiest secondary development that free secondary development; ⑧ complete device parameter monitoring function; ⑨ meet the railway traffic automation interface functions.
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