重要的注意事项:一个PTCON或NTCON触点将保持ON状态–个“执行周期”。例如,一旦PTCON传递能流,下一-次执行特定的PTCON指令时,PTCON将不传递能流。这是因为PTCON的行为取决于它的实例数据值,这个值每次PTCON执行时就被刷新。当PTCON执行并传递能流时,其实例数据被刷新,刷新后的实例数据包含与之相连的BOOL变量的当前值,该值必须是ON.PTCON第二次执行时,再次传递能流的条件不满足,因为其实例数据是ON而不是OFF.
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