描述
当输出元件为双向晶闸管或晶体管而外部负载又很小时,因为这类输出元件在关断时有较大的漏电流,使输入电路和外部负载电路不易关断,导致输入/输出信号的错误,为此应在这类输入/输出端并联旁路电阻,以减小PLC的输入电流和外部负载上的电流。
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