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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.
1.2.1 Take two squares two systems
UK's current computer interlocking system are: hot standby, two out of three and two by two to take two systems. Hot Standby system problem exists Dual switch, switch failure would have serious consequences for the risk; shielded redundant technology to take two of the three systems, although the possibility of dangerous output is extremely small, but there can not be downtime problems; therefore This year the main technological transformation and new railway lines have given priority to take two squares two systems, two by two computer interlocking system is also taking future trends.
1.2.2 Fully electronic
As manufacturing technology continues to improve, the electronic unit to get the vigorous development of electronic unit with a small, powerful features; facilitate networking, remote management and remote diagnostics. Thus, with the Ministry of Science and continues to progress, to get rid of the relay, using fully electronic computer interlocking will be a trend.
1.2.3 Modular
For ease of use and maintenance of computer interlocking should move towards modular, functional direction to achieve the module line replacement, saving the system maintenance time.
2 full electronic modular computer interlocking system features and functions
2.1 Fully electronic interlocking modular computer system with the characteristics
2.1.1 hardware configuration
Fully electronic interlocking modular computer system using industrial control technology, the abolition of all 6502 relay module is in direct control of the outdoor unit switch machines, signals machines, track circuits, in a clear, comprehensive fault diagnosis and fault indication and all modules support hot-swappable capabilities, cabinet wiring with plug-in cable directly correspond noseplate will minimize the amount of construction, the use of direct replacement module, the first maintenance after analyzing ways to achieve "fool" the construction and maintenance.
