140CPU53414B Quantum
利用PLC控制电机正反转等正、反动作时,为避免PC的异常动作引起事故及机械损坏,应在外部组成一个连锁回路。
接地:GR端子是大地接地端子。用防止感应电的接地线(截面积2mm2以上的电线)采用第三种接地方式(接地电阻100Ω以下)。
LG是噪音滤波器中性端子,若因噪音大而产生误动作,或为了防止电击,把LG与GR短接,采用第三种接地方式。接地线的长度在20m以内为宜。
接地线与其它设备共用或与建筑物的金属结构连接会适得其反,受到恶劣影响。
对于PLC输出不能直接带动负载的情况下,在外部采用驱动电路,可以用固态继电器或晶闸管电路驱动,同时应采用保护电路和浪涌吸收电路。
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