描述
I/O接口是输入(IN)/输出(OUT)接口的简称,是PLC主机与被控对象进行信息交换的纽带;PLC通过I/O接口与外部设备进行数据交换,PLC的输入输出信号有开关量、模拟量、数字量三种类型,所有的输入输出信号均经过光电等隔离,大大增强了PLC的抗干扰能力。
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