85UVF1-1QD

描述

85UVF1-1QD

PLC采用循环扫描的工作方式，在PLC中用户程序按先后顺序存放，CPU从第一条指令开始执行程序，直到遇到结束符后又返回第一条，如此周而复始不断循环。PLC的扫描过程分为内部处理、通信操作、程序输入处理、程序执行、程序输出几个阶段。全过程扫描一次所需的时间称为扫描周期。当PLC处于停状态时，只进行内部处理和通信操作服务等内容。在PLC处于运行状态时，从内部处理、通信操作、程序输入、程序执行、程序输出，一直循环扫描工作。输入处理也叫输入采样。在此阶段，顺序读入所有输入端子的通端状态，并将读入的信息存入内存中所对应的映象寄存器。在此输入映象寄存器被刷新。接着进入程序执行阶段。在程序执行时，输入映象寄存器与外界隔离，即使输入信号发生变化，其映象寄存器的内容也不会发生变化，只有在下一个扫描周期的输入处理阶段才能被读入信息。根据PLC梯形图程序扫描原则，按先左后右先上后下的步序，逐句扫描，执行程序。遇到程序跳转指令，根据跳转条件是否满足来决定程序的跳转地址。从用户程序涉及到输入输出状态时，PLC从输入映象寄存器中读出上一阶段采入的对应输入端子状态，从输出映象寄存器读出对应映象寄存器，根据用户程序进行逻辑运算，存入有关器件寄存器中。对每个器件来说，器件映象寄存器中所寄存的内容，会随着程序执行过程而变化。可编程控制器的结构多种多样，但其组成的一般原理基本相同，都是以微处理器为核心的结构。通常由中央处理单元（CPU）、存储器（RAM、ROM）、输入输出单元（I/O）、电源和编程器等几个部分组成。 CPU作为整个PLC的核心，起着总指挥的作用。CPU一般由控制电路、运算器和寄存器组成。这些电路通常都被封装在一个集成电路的芯片上。CPU通过地址总线、数据总线、控制总线与存储单元、输入输出接口电路连接。CPU的功能有以下一些：从存储器中读取指令，执行指令，取下一条指令，处理中断。=

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