描述
不同的负载对PLC的输出方式有相应的要求。例如，频繁通断的感性负载，应选择晶体管或晶闸管输出型的，而不应选用继电器输出型的。但继电器输出型的PLC有许多优点，如导通压降小，有隔离作用，价格相对较便宜，承受瞬时过电压和过电流的能力较强，其负载电压灵活（可交流、可直流）且电压等级范围大等。所以动作不频繁的交、直流负载可以选择继电器输出型的PLC。
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