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6ES7403-1TA01-0AA0西门子接触器
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FX2N系列PLC硬件组成与其他类型PLC基本相同，主体由三部分组成，主要包括中央处理器CPU、存储系统和输入、输出接口。PLC的基本结构如图1-1所示。系统电源有些在CPU模块内，也有单独作为一个单元的，编程器一般看作PLC的外设。PLC内部采用总线结构，进行数据和指令的传输。
外部的开关信号、模拟信号以及各种传感器检测信号作为PLC的输入变量，它们经PLC的输入端子进入PLC的输入存储器，收集和暂存被控对象实际运行的状态信息和数据；经PLC内部运算与处理后，按被控对象实际动作要求产生输出结果；输出结果送到输出端子作为输出变量，驱动执行机构。PLC的各部分协调一致地实现对现场设备的控制。
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