抗干扰与外部互锁当 PLC输出带感性负载
基座安装（RACK）时，在决定控制箱内各种控制组件及线槽位置后，要依照图纸所示尺寸，标定孔位，钻孔后将固定螺丝旋紧到基座牢固为止。在装上电源供应模块前，必须同时注意电源线上的接地端有无与金属机壳连结，若无则须接上。接地不好的话，会导致一系列的问题，静电、浪涌、外干扰，等等。由于不接地，往往PLC也能够工作，因此，不少经验不足的工程师就误以为接地不那么重要了。这就像登山的时候，没有系上保护缆绳一样，虽然你正常前进的时候，保护缆绳没有任何作用，但一旦你失足的时候，没有那根绳子，你的生命就完结了。PLC的接地，就相当于给PLC系上保护缆绳。
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