3BSE051826R1

 与其它控制设备比较，PLC最重要的特征是“扫描”。PLC上电后，自动重复执行程序扫描和I/O扫描，即输入采样、用户程序执行和输出刷新三个阶段。完成上述三个阶段称作一个扫描周期。在输入采样阶段，PLC以扫描方式依次地读入所有输入状态和数据，并将它们存入I/O映象区中相应的单元内，输入采样结束后，转入用户程序执行和输出刷新阶段，即使输入状态和数据发生变化，I/O映象区中的相应单元的状态和数据也不会改变。在用户程序执行阶段，PLC按由上而下、先左后右的顺序依次地扫描程序（梯形图），根据逻辑运算的结果，刷新RAM存储区或I/O映象区对应单元的状态。在输出刷新阶段，根据I/O映象区内对应的状态和数据刷新所有的输出锁存电路，再经输出电路驱动相应的外设，这时，才是PLC的真正输出。可见，采用PLC程序控制的过程和结果与继电器逻辑回路是有区别的，特别是涉及到梯级的次序、脉冲信号的捕捉等，与PLC的扫描原理是密切相关的。实践中，大量的程序问题均源于此，常常会出现不可思议的结果。因此，设计PLC程序，必须精通PLC的基本原理。全面提高程序的质量，提高编程效率，使程序具有良好的可读性、可靠性、可维护性以及良好的结构，是每位程序设计者的目标。IEC61131-3是国际电工委员会(IEC)于1999年推出的用于工业控制领域的标准化编程语言，具有开放性、可移植性、结构化编程和结构化数据、检错和纠错能力强等特点，适用于plc编程。采用结构化程序设计，便于构造程序(尤其是复杂的程序)、多人设计，调试以及软件管理。虽然软件工程的思想已被绝大部分程序员所接受，但要将这种思想转化为软件开发过程中的自觉行为却不是一件很容易的事。  CPU模块主要由微处理器（CPU芯片）和存储器组成。在PLC控制系统中，CPU模块相当于人的大脑和心脏，它不断地采集输入信号，执行用户程序，刷新系统的输出；存储器用来储存程序和数据。S7-300/400将CPU模块简称为CPU。

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