描述
输入继电器是PLC中用来专门存储系统输入信号的内部虚拟继电器。它又被称为输入的映像区，它可以有无数个动合触点和动断触点，在PLC编程中可以随意使用。这类继电器的状态不能用程序驱动，只能用输入信号驱动。FX系列PLC的输入继电器采用八进制编号。FX2N系列PLC带扩展时，输入继电器最多可达184点，其编号为X0～X7、X10～X17…X260～X267。
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