Record maximum value in Wonderware InTouch

vojvoda82

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Sep 2010

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Sybiria

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• Jun 14, 2011

• #1

hi there,

I have a tag in which is stored realtime value of voltage. I'm need a way to record a maximuum value of this voltage and dispay it on some InTouch or ArchestrA simbol. Is there any way to do this whitout using wonderware historian?

 

Brijm

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• Jun 14, 2011

• #2

It sounds like you do not need a history, but only a single max number. Depending on how fast the data is changing, and how accurate you need to be I would do this in the PLC. Communication normally does not scan very quickly on an HMI.

 

rdrast

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Apr 2003

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South Carolina Lowcountry

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• Jun 14, 2011

• #3

You can use a data change script, but I'd just put the logic in the PLC myself.
In either event, the basic logic is just:

IF Actual_Value > Max_Value THEN Max_Value = Actual Value

 

vojvoda82

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• Jun 16, 2011

• #4

Thanks man!