描述

不同的負載對PLC的輸出方式有相應的要求。例如，頻繁通斷的感性負載，應選擇晶體管或晶閘管輸出型的，而不應選用繼電器輸出型的。但繼電器輸出型的PLC有許多優(yōu)點，如導通壓降小，有隔離作用，價格相對較便宜，承受瞬時過電壓和過電流的能力較強，其負載電壓靈活（可交流、可直流）且電壓等級范圍大等。所以動作不頻繁的交、直流負載可以選擇繼電器輸出型的PLC。

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