如果你使用递归(也就是说子程序直接或间接调用本身),要编制程序块以便在定时器递归调用本身之前调用定时器。在带参数块内部使用定时器的相关信息,见8-错误1未定义书签。如果前次扫描时间大于PV,ONDTR终止(能流向右传递)已经激活的,没有复位的第一次扫描。在一个每次扫描都不调用的程序块中使用ONDTR,除非定时器复位,不然在程序
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