阅读说明：本技术 一种plc控制方法和装置 (PLC control method and device ) 是由 张帆 肖鹏 钟威 夏芳 潘稻 于 2018-09-25 设计创作，主要内容包括：本申请实施例提供了一种PLC控制方法和装置,控制通过零线、以及零线与差分信号处理电路之间的通路传输第一信号；控制通过火线、以及火线与差分信号处理电路之间的通路传输第二信号；将差分信号处理电路与零线或火线之间的通路切断并将差分信号处理电路与所述地线之间导通,当地线的传输速率大于或等于预设的传输速率阈值时,通过地线、以及地线与差分信号处理电路之间的通路传输第一信号或第二信号。由于电力线路中地线干扰小,因此将差分信号处理电路中任一信号通过地线传输,隔离了一部分的电网噪声,传输信噪比变大,进而提高了电力线通信调制解调器的传输速率。(The embodiment of the application provides a PLC control method and a PLC control device, which are used for controlling the transmission of a first signal through a zero line and a passage between the zero line and a differential signal processing circuit; controlling transmission of a second signal through the live line and a path between the live line and the differential signal processing circuit; and when the transmission rate of the ground wire is greater than or equal to a preset transmission rate threshold value, transmitting a first signal or a second signal through the ground wire and the passage between the ground wire and the differential signal processing circuit. Because the ground wire interference in the power line is small, any signal in the differential signal processing circuit is transmitted through the ground wire, part of power grid noise is isolated, the transmission signal-to-noise ratio is increased, and the transmission rate of the power line communication modem is further improved.)