ＰＬＣ计时、计数指令的串级使用 ,能够扩展定时器的定时范围 ,在工业生产及科研实验中需要定时、延时时经常用到。对于一般不太精确的定时或延时 ,可以不考虑ＰＬＣ的扫描周期 (ＣＥ -Ｉ系列为0 0 2ｓ) ,但对于一些要求比较高的实验或生产工艺中的定时就不得不考虑。下面仅以 PLC timing, counting instructions cascade use, can extend the timer range of timing, in industrial production and research experiments need timing, delay often used. For generally less precise timing or delay, you can not consider the PLC scan cycle (CE-I series is 0 0 2s), but for some of the more demanding experiments or production processes have to consider the timing. Only below