描述
输入继电器（X0～X177）PLC的输入端子是从外部开关接收信号的窗口。FX2的输入继电器最多可达128点，采用八进制编号，且不能用程序驱动。
输出继电器（Y0～Y177）PLC的输出端子是向外部负载输出信号的窗口。FX2的输出继电器最多可达128点，且编号为八进制。外部负载的驱动必须由输出继电器实行。
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