描述
PLC的输出端经常连接的是感性输出设备（感性负载），为了抑制感性电路断开时产生的电压使PLC内部输出元件造成损坏。因此当PLC与感性输出设备连接时，如果是直流感性负载，应在其两端并联续流二极管；如果是交流感性负载，应在其两端并联阻容吸收电路
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