工业缝包机项目案例
气动阀的工作原理介绍：如下面的示意图所示分为两部，左边部分是继电器线圈不得电失电的气路分析，是从P进入A再经气缸【当成负载】从B出来到S排出形成一个闭环；右边部分是继电器线圈得电的气路分析是从P进入B再经气缸【当成负载】从A出来到R排出形成一个闭环；
对于接近开关、光电接触器等电子元件是分NPN型和PNP型的，与PLC的连接也分源型接入和漏型接入之分；如右侧的NPN型，光电开关的黑线输出是负极性有效，则连接到PLC的源型输入是一对的；如左侧的PNP型，光电开关的黑线输出是正极性有效，则连接到PLC的漏型输入是一对的；
固态继电器的电源+接PLC的Q0.0，固态继电器的电源-接PLC的0V；气动阀的线圈接PLC的Q0.1，气动阀的线圈接PLC的0V，
程序编写的逻辑图如下图所示：
程实的实现代码
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You’ll have to specify at which point you don’t quite understand the process, is it the process flow, or is it the code of the program that you don’t quite understand.
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