当OFDT用于一个不是每次扫描都调用的程序块时，定时器可累加程序块的调用时间,直到定时器复位为止。此意即为:其作用类似于一个定时器以低于在主程序块中更慢些的扫描在一个程序中操作。对于长时间处于非激活态的程序块,定时器应在编程时考虑这一功能。例如:如果程序块中的某个定时器复位且程序块未调用(即非激活态)为4分钟,当程序块被调用时,此4分钟即已累加进去。启动定时器时该时间即被用于定时器,除非定时器为首次复位。
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