描述
二、经验设计法的编程步骤
1、在准确了解控制要求后,合理地为控制系统中的事件分配输入输出口。选择必要的机内器件,如定时器、计数器、辅助继电器。
2、对于一些控制要求较简单的输出,可直接写出它们的工作条件,依“起—保—停”电路模式完成相关的梯形图支路。工作条件稍复杂的可借助辅助继电器。
3、对于复杂的控制要求,为了能用“起—保—停”电路模式绘出输出口的梯形图,要正确分析控制要求,并确定组成总的控制要求的关键点。在空间类逻辑为主的控制中为影响控制状态的点。在时间类逻辑为主的控制中,关键点为控制状态转换的时间。
4、将关键点用梯形图表达出来。关键点总是要用机内器件来代表的,在安排机内器件时需要考虑并安排好。绘关键点的梯形图时,可以使用常见的基本环节。
5、在完成关键点梯形图的基础上,针对系统最终的输出进行梯形图的编绘。使用关键点综合出最终输出的控制要求。
6、审查以上草绘图纸,在此基础上,补充遗漏的功能,更正错误,进行最后的完善。
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