1747-L552

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描述

1747-L552

PLC编程语言与一般计算机语言相比,具有明显的特点,它既不同于高级语言,也不同与一般的汇编语言,它既要满足易于编写,又要满足易于调试的要求。目前,还没有一种对各厂家产品都能兼容的编程语言。如三菱公司的产品有它自己的编程语言,OMRON公司的产品也有它自己的语言。但不管什么型号的PLC,PLC编程语言都具有以下特点:

    1.图形式指令结构:程序由图形方式表达,指令由不同的图形符号组成,易于理解和记忆。系统的软件开发者已把工业控制中所需的独立运算功能编制成象征性图形,用户根据自己的需要把这些图形进行组合,并填入适当的参数。在逻辑运算部分,几乎所有的厂家都采用类似于继电器控制电路的梯形图,很容易接受。如西门子公司还采用控制系统流程图来表示,它沿用二进制逻辑组件图形符号来表达控制关系,很直观易懂。较复杂的算术运算、定时计数等,一般也参照梯形图或逻辑组件图给予表示,虽然象征性不如逻辑运算部分,也受用户欢迎
    2.明确的变数常数:图形符相当于操作码,规定了运算功能,操作数由用户填人,如:K400,T120等。PLC中的变量和常数以及其取值范围有明确规定,由产品型号决定,可查阅产品目录手册。
    3.简化的程序结构:PLC的程序结构通常很简单,典型的为块式结构,不同块完成不同的功能,使程序的调试者对整个程序的控制功能和控制顺序有清晰的概念。
    4.简化应用软件生成过程:使用汇编语言和高级语言编写程序,要完成编辑、编译和连接三个过程,而使用编程语言,只需要编辑一个过程,其余由系统软件自动完成,整个编辑过程都在人机对话下进行的,不要求用户有高深的软件设计能力。
    5.强化调试手段:无论是汇编程序,还是高级语言程序调试,都是令编辑人员头疼的事,而PLC的程序调试提供了完备的条件,使用编程器,利用PLC和编程器上的按键、显示和内部编辑、调试、监控等,并在软件支持下,诊断和调试操作都很简单。
    总之,PLC的编程语言是面向用户的,对使用者不要求具备高深的知识、不需要长时间的专门训练。

产品承诺:
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专业销售进口DCS  PLC系统备件模块

PLC模块,可编程控制器,CPU模块,IO模块,AI模块,通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗

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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。