经验设计法简介 梯形图程序设计是可编程控制器应用中最关键的问题 ,PLC 梯形图程序设计常用方法有 : 经验设计法、顺序控制设计法和逻辑代数设计法等。

PLC 梯形图程序用“经验设计法”编写 , 是沿用了设计继电器电路图的方法来设计梯形图 , 即在某些典型电路的基础上 , 根据被控对象对控制系统的具体要求 , 不断地修改和完善梯形图。有时需要多次反复地进行调试和修改梯形图 , 不断地增加中间编程元件和辅助触点 , 最后才能得到一个较为满意的结果。因此 , 所谓的经验设计法是指利用已经的经验 ( 一些典型的控制程序、控制方法等 ), 对其进行重新组合或改造 , 再经过多次反复修改 , 最终得出符合要求的控制程序。

这种设计方法没有普遍的规律可以遵循 , 具有很大的试探性和随意性 , 最后的结果也不是唯一的 , 设计所用的时间、设计质量与设计者的经验有很大的关系 , 因此有人就称这种设计方法为经验设计法 , 它是其他设计方法的基础 , 用于较简单的梯形图程序设计。

用经验设计法编程 , 可归纳为以下四个步骤 :

-About the experience of design ladder program design is the application of programmable logic controller of the most critical issues, PLC ladder programming methods commonly used are: experience design, design of sequential control and logic design, such as algebra.

PLC ladder program of "experience design" to prepare, the relay is used for circuit design approach to the design of ladder, that is, in some typical circuit based on the plant control system for specific requirements, and continuously modify and improve the ladder. Sometimes repeated many times to debug and modify the ladder, continue to increase in the middle of programming components and auxiliary contacts, and finally to get a more satisfactory results. Therefore, the so-called experience design is the use of the experience (some typical control procedures, control procedures, etc.), their re-combination or transformation, and then repeated after several modifications in order to work out the control procedures to mee