The premise of empirical design
1.PLC programming,from the ladder diagram,the fundamental point is to find out the working conditions of each output of the system that meet the control requirements,and these conditions always appear in the logical relationship of various devices in the machine;
2.The basic mode of the ladder diagram is the”start-safe-stop”circuit,each”start-safe-stop”circuit generally only targets one output,which can be the actual output of the system or an intermediate variable.
3.There are some conventional basic links in ladder diagram programming.They all have certain functions and can be applied in many places like building blocks.
经验设计法的前提
1、PLC的编程,从梯形图来看,其根本点是找出符合控制要求的系统各个输出的工作条件,这些条件又总是以机内各种器件的逻辑关系出现的;
2、梯形图的基本模式为“起—保—停”电路,每个“起—保—停”电路一般只针对一个输出,这个输出可以是系统的实际输出,也可以是中间变量。
3、梯形图编程中有一些约定成俗的基本环节,它们都有一定的功能,可以像积木一样在许多地方应用。
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