6SC6190-0FB01

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描述

6SC6190-0FB01

 当PLC运行时，CPU就要执行用户程序中的操作。但是CPU不可能同时执行多个操作，只能分时地一个操作一个操作地执行。PLC利用系统软件在其内部建立了输入输出映像区，当PLC的CPU执行用户程序时，从输入映像区中读取输入信号的状态，进行相应的操作。当CPU执行完第一个操作后，将操作结果输出到输出映像区，然后再执行第二个操作，操作结果送到输出映像区。在程序执行过程中，PLC并不读取输入信号的真正状态，执行结果也并没有输出到PLC外部。只有当程序执行到结束指令（END）时，将输出映像区中执行结果向PLC外部输出一次，将输入信号的状态读取一次送到输入映像区。对输入输出信号的这一操作过程称为I/O刷新。I/O刷新完成后，CPU再从用户程序的第一条指令开始，进行下一次程序执行。PLC的这种工作方式被称为扫描方式。PLC的扫描周期包括上电后初始处理、共同处理、上位链接服务、外设服务、运算处理、I/O刷新。

PLC执行程序的过程分为三个阶段，即输入采样阶段、程序执行阶段、输出刷新阶段，PLC的扫描工作过程:
    （1）输入采样阶段。在这一阶段中，PLC以扫描方式读入所有输入端子上的输入信号，并将各输入状态存入对应的输入映像寄存器中。此时，输入映像寄存器被刷断。在程序执行阶段和输出刷新阶段中，输入映像存储器与外界隔离，其内容保持不变，直至下一个扫描周期的输入扫描阶段，才被重新读入的输入信号刷新。可见，PLC在执行程序和处理数据时，不直接使用现场当时的输入信号，而使用本次采样时输入到映像区中的数据。一般来说，输入信号的宽度要大于一个扫描周期，否则可能造成信号的丢失。
    （2）程序执行阶段。在执行用户程序过程中，PLC按照梯形图程序扫描原则，一般来说，PLC按从左至右、从上到下的步骤逐个执行程序。但遇到程序跳转指令，则根据跳转条件是否满足来决定程序跳转地址。程序执行过程中，当指令中涉及输入、输出状态时，PLC就从输入映像寄存器中“读入”对应输入端子状态，从输出映像寄存器“读入”对应元件（“软继电器”）的当前状态。然后进行相应的运算，运算结果再存入输出映像寄存器中。对输出映像寄存器来说，每一个元件（“软继电器”）的状态会随着程序执行过程而变化。
    （3）输出刷新阶段。程序执行阶段的运算结果被存入输出映像区，而不送到输出端口上。在输出刷新阶段，PLC将输出映像区中的输出变量送入输出锁存器，然后由锁存器通过输出模块产生本周期的控制输出。如果内部输出继电器的状态为“1”，则输出继电器触点闭合，经过输出端子驱动外部负载。全部输出设备的状态要保持一个扫描周期。

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选择深圳长欣，选择放心，售后无忧大量现货，当天顺丰发货！
主营：本特利，英维思，伍德沃德，福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐，ACSO，力士乐等各大品牌的DCS系统配件，机器人系统配件，大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”（不管能不能看懂，先了解个大概，以便学习编程时查找）；
2、由位控逻辑入手，逐渐增加定时、计数等条件，把或、与、非关系理顺；
3、进而练习整数运算、实数运算、类型转换；
4、量程转换、PID调节回路的建立及P、I、D参数的理解（最好是有个物理回路验证，比如变频器+电机+测速传感器）；
5、循环、顺序、跳转等程序控制（尽量避免跳转，非跳不可时也是跳的越近越好）；
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列，GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌，由于PLC的基本框架大同小异，学会一种至于其它的学习起来也就简单了。

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