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1·Therefore it is necessary to perfect the existing relay equipment based on the rule of fault-safety in order to achieve the function of railway signal computer-based interlocking control system.

操作表示机是计算机联锁系统中关键的人机界面设备，硬件上利用继电器组成的逻辑电路，实现双机热备的倒机逻辑控制和设备接口电缆的动态切换。

2·Two different types routes for midway return operation during shunting in 6502 relay interlocking for station are illustrated.

简述6502电气集中车站调车转线作业所形成的两种不同类型的中途返回进路。