6FC5114-0AA01-1AA0

在PLC发展的初期，沿用了设计继电器电路图的方法来设计梯形图程序，即在已有的些典型梯形图的基础上，根据被控对象对控制的要求，不断地修改和完善梯形图。有时需要多次反复地调试和修改梯形图，不断地增加中间编程元件和触点，较后才能得到一个较为满意的结果。这种方法没有普遍的规律可以遵循，设计所用的时间、设计的质量与编程者的经验有很大的关系，所以有人把这种设计方法称为经验设计法。它可以用于逻辑关系较简单的梯形图程序设计。
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