IC693BEM340

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描述

IC693BEM340

在PLC的存储器中，设置了一片区域用来存放输入信号和输出信号的状态，它们分别称为输入映像寄存器和输出映像寄存器。PLC梯形图中的其他编程元件也有对应的映像存储区，它们统称为元件映像寄存器。
    在输入处理阶段，PLC把所有外部输入电路的接通，断开状态读入输入映像寄存器。外部输入电路接通时，对应的输入映像寄存器为l状态，梯形图中对应的输入继电器的常开触点接通，常闭触点断开。外部输入触点电路断开时，对应的输入映像寄存器为0状态，梯形图中对应的输入继电器的常开触点断开，常闭触点接通。
    某一编程元件对应的映像寄存器为l状态时，称该编程元件为ON，映像寄存器为0状态时，称该编程元件为OFF。
    在程序执行阶段，即使外部输入信号的状态发生了变化，输入映像寄存器的状态也不会随之而变，输入信号变化了的状态只能在下一个扫描周期的输入处理阶段被读入。
    PLC的用户程序由若干条指令组成，指令在存储器中按步序号顺序排列。在没有跳转指令时，CPU从第一条指令开始，逐条顺序地执行用户程序，直到用户程序结束之处。在执行指令时，从输入映像寄存器或别的元件映像寄存器中将有关编程元件的0／1状态读来，并根据指令的要求执行相应的逻辑运算，运算的结果写入到对应的元件映像寄存器中，因此，各编程元件的映像寄存器(输入映像寄存器除外)的内容随着程序的执行而变化。
    在输出处理阶段，CP／7将输出映像寄存器的0／1状态传送到输出锁存器。梯形图中某一输出继电器的线圈“通电”时，对应的输出映像寄存器为1状态。信号经输出模块隔离和功率放大后，继电器型输出模块中对应的硬件继电器的线圈通电，其常开触点闭合，使外部负载通电工作。
    若梯形图中输出继电器的线圈“断电”，对应的输出映像寄存器为0状态，在输出处理阶段之后，继电器型输出模块中对应的硬件继电器的线圈断电，其常开触点断开，外部负载断电，停止工作。

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主营DCS系统配件
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15天包退换 一年质保 大量现货  国内实力库存商家


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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