AB产品1794-TB2

1794-TB2从机械手动作流程图可以看出，这个控制任务每个循环的工作可以划分为八步，其中第1步与第5步动作相同，均为上升；第3步和第7步动作相同，均为下降。在利用步进指令进行编程时，这两个工步所对应的程序段的输出不能直接设置为Y3、Y4，同一个输出使用两次则会出现语法错误。这时应考虑使用用于存储中间状态的内部通用继电器Rn来解决这个问题。如图7所示梯形图程序，其中R1、R5分别被定义为第1步与第5步的输出，R3、R7分别被定义为第3步与第7步的输出，在步进结束后再将R1、R5的状态输出到上升Y3，将R3、R7的状态输出到下降Y4，通过这样的方法可方便解决顺序控制任务中若干工步输出相同的问题。

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