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Rank: Newbie
Groups: Member
Joined: 10/31/2008
Posts: 4
Location: USA
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I'm trying to concatenate the archive data from two tags into one data set. Basically I have a start time of the new tag and an end time of the old tag, and I want to throw them both into one data set in Process Book. (see (semi)illustration below) The problem is, I'm having trouble locating a list of the data set expressions that you can use when creating a data set. How can I do this, and where can I get a list of expressions for data sets? Thanks in advance. 
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Rank: Administration
Groups: Administration
Joined: 6/20/2008
Posts: 612
Location: Cheshire, United Kingdom.
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Hello... An Expression Dataset is based on Performance Equation syntax so you should have a document "PEReference.chm" that lists the available functions. With regards to your particular issue, my thinking cap is on so watch this space. Rhys. Principal Consultant
Real-Time Data Management @ Wipro Technologies
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Rank: Administration
Groups: Administration
Joined: 6/20/2008
Posts: 612
Location: Cheshire, United Kingdom.
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Had 2 minutes to spare...you can combine in a Dataset using the below example expression (substitute your own time/tags): if PrevEvent('Tag1','*') < '18-Nov-09 00:00:00' then 'Tag1' else 'Tag2' Principal Consultant
Real-Time Data Management @ Wipro Technologies
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