140CPU43412

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140CPU43412
 关于梯形图的格式,一般有如下一些要求:每个梯形图网络由多个梯级组成。每个输出元素可构成一个梯级,每个梯级可有多个支路。通常每个支路可容纳11个编程元素,最右边的元素必须是输出元素。一个网络最多允许16条支路。
    关于三菱PLC梯形图有以下几个基本特点:
    (1)PLC梯形图与电气操作原理图相对应,具有直观性和对应性,并与传统的继电器逻辑控制技术相一致。
    (2)梯形图中的“能流”不是实际意义的电流,而是“概念”电流,是用户程序解算中满足输出执行条件的形象表示方式。“能流”只能从左向右流动。
    (3)梯形图中各编程元件所描述的常开触点和常闭触点可在编制用户程序时无限引用,不受次数的限制,既可常开又可常闭。
    (4)梯形图格式中的继电器与物理继电器是不同概念。在PLC的编程元件沿用了继电器这一名称,如输入继电器、输出继电器、内部辅助继电器等。对于PLC来说,其内部的继电器并不是实际存在的具有物理结构的继电器,而是指软件中的编程元件(软继电器)。编程元件中的每个软继电器触点都与PLC存储器中的一个存储单元相对应。因此,在应用时,须与原有继电器逻辑控制技术的有关概念区别对待。
    (5)梯形图中输入继电器的状态只取决于对应的外部输入电路的通断状态,因此在梯形图中没有输入继电器的线圈。输出线圈只对应输出映像区的相应位,不能用该编程元件直接驱动现场机构,位的状态必须通过I/O模板上对应的输出单元,才能驱动现场执行机构进行最后动作的执行。
    (6)根据梯形图中各触点的状态和逻辑关系,可以求出与图中各线圈对应的编程元件ON/OFF状态,称为梯形图的逻辑解算。逻辑解算是按梯形图中从上到下、从左至右的顺序进行的。逻辑解算是根据输入映像寄存器中的值,而不是根据逻辑解算瞬时外部输入触点的状态来进行的。
    (7)梯形图中的用户逻辑解算结果,马上可为后面用户程序的逻辑解算所利用。
    (8)梯形图与其他程序设计语言有一一对应关系,便于相互的转换和对程序的检查。但对于较为复杂的控制系统,与状态转移图等程序设计语言比较,梯形图的逻辑性描述还不够清晰。

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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。