品牌:GE/通用电气
起订:1件
供应:100件
发货:3天内
信息标签:IC693PWR331,供应,电子、电工,工控系统及装备
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IC693PWR331PLC常用程序设计语言简介方源 可编程控制器程序设计语言: ?? 在可编程控制器中有多种程序设计语言,它们是梯形图语言、布尔助记符语言、功能表图语言、功能模块图语言及结构化语句描述语言等。梯形图语言和布尔助记符语言是基本程序设计语言,它通常由一系列指令组成,用这些指令可以完成大多数简单的控制功能,例如,代替继电器、计数器、计时器完成顺序控制和逻辑控制等,通过扩展或增强指令集,它们也能执行其它的基本操作。功能表图语言和语句描述语言是高级的程序设计语言,它可根据需要去执行更有效的操作,例如,模拟量的控制,数据的操纵,报表的报印和其他基本程序设计语言无法完成的功能。功能模块图语言采用功能模块图的形式,通过软连接的方式完成所要求的控制功能,它不仅在可编程序控制器中得到了广泛的应用,在集散控制系统的编程和组态时也常常被采用,由于它具有连接方便、操作简单、易于掌握等特点,为广大工程设计和应用人员所喜爱。 ?? 根据可编程器应用范围,程序设计语言可以组合使用,常用的程序设计语言是: ?? 梯形图程序设计语言 ?? 布尔助记符程序设计语言(语句表) ?? 功能表图程序设计语言 ?? 功能模块图程序设计语言 ?? 结构化语句描述程序设计语言 ?? 梯形图与结构化语句描述程序设计语言 ?? 布尔助记符与功能表图程序设计语言 ?? 布尔助记符与结构化语句描述程序设计语言 ??1、梯形图(Ladder Diagram)程序设计语言 ????梯形图程序设计语言是用梯形图的图形符号来描述程序的一种程序设计语言。采用梯形图程序设计语言,程序采用梯形图的形式描述。这种程序设计语言采用因果关系来描述事件发生的条件和结果。每个梯级是一个因果关系。在梯级中,描述事件发生的条件表示在左面,事件发生的结果表示在后面。 ????梯形图程序设计语言是**常用的一种程序设计语言。它来源于继电器逻辑控制系统的描述。在工业过程控制领域,电气技术人员对继电器逻辑控制技术较为熟悉,因此,由这种逻辑控制技术发展而来的梯形图受到了欢迎,并得到了广泛的应用。 ????梯形图程序设计语言的特点是: IC693PWR331(1)与电气操作原理图相对应,具有直观性和对应性; ????(2)与原有继电器逻辑控制技术相一致,对电气技术人员来说,易于撑握和学习; ????(3)与原有的继电器逻辑控制技术的不同点是,梯形图中的能流(Power FLow)不是实际意义的电流,内部的继电器也不是实际存在的继电器,因此,应用时,需与原有继电器逻辑控制技术的有关概念区别对待;
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