描述
PLC的一个定时器的延时时间都较短,如FX系列PLC中一个0.1s定时器的定时范围为0.1~3276.7s,如果需要延时时间更长的定时器,可采用多个定时器串级使用来实现长时间延时。定时器串级使用时,其总的定时时间为各定时器定时时间之和。
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