140NOE77101

140NOE77101

140NOE77101

方案一主要用到的是四个计数器，第一个计数器表示秒，第二计数器表示分，第三个计数器表示时，第四个计数器表示天。当第一个计数器计数60次(即60s)时，自动给第二个计数器一个接通信号计数值变为1，同时把第一个计数器复位，以此类推，实现长时间的计时。

方案二主要是通过自加一INC指令来代替计数器的功能。

计时到的提醒，通过对各个计数器的计数值与用户的设定值进行比较，当各个计数器的计数值大于或等于用户的设定值时，表示计时到，进行输出提醒。以下用海为PLC介绍两种方案。

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