在硬件系统中，主要介绍了励磁电路、信号处理电路、人机接口、信号输入输出电路及空管检测电路等几个部分。
In the hardware system, mainly introduced the exciting circuit, signal processing circuit, man-machine interfaces, signal input and output circuits and the method of empty pipe detection.
尽管攻击代码已经破坏了通信系统，但他们的活动仍须依靠基本输入输出系统接口和操作系统接口。
Though the attackers have breached the communications, they must still depend on the BIOS and OS interfaces.
主要论述了在PLC控制系统中，为了提高系统的安全可靠性，PLC的输入输出接口应注意的事项和较实用的接线方式。
The paper mainly discussed the practical connection modes in the PLC the points of attention for PLC control system, so as to improve input and output interface and the system safety and reliability.
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