它由自耦变压器、数字逻辑电路和低压小继电器电路组成。
This device consists of self-coupling transfer, digital logic circuit and low voltage relay circuit.
本文将机车继电器控制电路等效为数字组合逻辑电路，建立了它的固定故障等效模型。
The electric locomotive bang-bang circuit is converted into an equivalent digitalcombinational logic circuit for setting up its stuck-at fault model.
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。
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.
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