A filament relay only checks the status of the lighting filament in the circuit route of lighting railway signal, not checks the status of another one.
在信号机点灯电路中，灯丝继电器只检查点灯灯丝的情况，不检查另外一个灯的情况。
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。
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