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A long-standing problem: how to know start time and end time of ON/OFF/String tag changed

Question asked by Jiabin Pei on Jan 30, 2015
Latest reply on Oct 8, 2015 by ashaw

As I know ,

there are some solutions to resolve that.

1. PE tag we can create a PE tag to record change time , and as the start time or end time ,

but when I list PE tag values , how to know which time is start time ,which is end .

because tag stuct only two columns : TIME and VALUE .

2. use the PI function . and still can not let us know which is start ,which is end .

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