描述
当PLC的输出端接直流继电器KD时，流过线圈的电流为直流，为排除不能分闸的故障，可在线圈两端并联一个二极管，如图3所示。当KD断电，它的动触头动断图3直流继电器线圈反并联二极管时，K中的电流通过二极管VD续流，能降低K线圈断电时产生的高电压，有利于灭弧，避免PLC的输出接点被粘住。
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