PLC减少接点和接线，明显提高了电控系统的安全可靠性；
The PLC system decrease touch and connection, and it's distinct advance SCR system that safe reliability.
高处的终端D'连接线圈的A'中心，其它终端更适宜连接地线，同样，对于线圈C'在此之上鉴于安全再次提醒。
The elevated terminal D' connects with the centre of the coil A' and the other terminal is connected to earth and preferably, also, to the coil C' again for safety reasons as mentioned above.
发电厂和变电所的继电控制接线，又称为“二次接线”，是发电厂和变电所安全生产、运行维护的重要组成部分。
The relay control wiring, also known as"secondary wiring", plays an important part in the safely operating, running and maintaining in the power plant and the substation.
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