范例;-一个功能块被定义为对一个定时器功能块使用一一个成员变量。该功能块的两个实例timer.A和timer_ _B被建立。在每次逻辑扫描期间,timer_ A和timer_ B都被执行。然而,只有在timer_ A中的成员变量被更新,timer_ B中的成员变量–直保持为0。
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