西门子6ES7315-2EH14-0AB0

6ES7315-2EH14-0AB0

PLC的外部设备主要是指控制系统中的输入输出设备，其中输人设备是对系统发出各种控制信号的主令电器，在编写控制程序时注意外部输入设备使用的是常开还是常闭触点，并以此为基础进行程序编制。否则易出现控制错误。

在PLC内部存储器中有于输入状态存储的输入继电器区，各输入设备（开关、按钮、行程开关或传感器信号）的状态经由输入接口电路存储在该区域内，每个输入继电器可存储一个输入设备状态。

PLC中使用的"继电器"并非实体继电器，而是"软继电器"，可提供无数个常开、常闭触点用于编程。每个"软继电器"仅对应PLC存储单元中的一位（bit），该位状态为"1"，表示该"软继电器线圈"通电，则程序中所有该继电器的触点都动作。输入继电器作为PLC接收外部主令信号的器件，通过接线与外部输入设备相联系，其"线圈"状态只能由外部输入信号驱动。

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