AnsweredAssumed Answered

SPAN AND ZERO. WHAT IS THE IMPACT TO MODIFY IT?

Question asked by OmarSánchez on Oct 28, 2020
Latest reply on Oct 30, 2020 by OmarSánchez

I was wondering if someone can help me to understand how the "SPAN" attribute works. Let me explain briefly:

 

1. I am using the virtual machine of an OSIsoft course, because I have not still access to the PI System tools with my company account, so I have tried out to change the span of "sinousoid" Tag from 100 to 80, and looking forward to observing any change in the trend, but unfortunately, but without success. 

2. As far as I concerned, if I set up a Span = 80, when the values of Sinusoid surpasses 80 (because Zero = 0, so Max = Span), then , it is expetected to see the next value  = ' Over Range´ or ' Out of Range'.  

3. Why can't I see this change in the values printed to PI Data Link or AF Trend?

 

 

It is maybe because the Sinusoid values are not still reach the new MAX_value = 80 since I have changed the Span value?  Or it is because the Sinusoid value is a special value in the Data Archive which is used as an example? @

 

 

I will appreciate your answer, 

 

Thanks in advance,

 

Regards,

 

Omar. 

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