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Rank: Newbie
Groups: Member
Joined: 2/6/2010
Posts: 6
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can anyone help me how to get the state of a digital tag,i mean 'ON or OFF' using VB for displaying on a web page.I can able to read the analog tags using 'snapshot.value" but not digital tags.How to handle digital tags in vb ?
cheers,
danny
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Rank: Administration
Groups: Administration
Joined: 6/20/2008
Posts: 612
Location: Cheshire, United Kingdom.
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Hi Danny, When dealing with a digital tag (or a digital error state for analog tags) then you require a variable of type PISDK.DigitalState. Example is below, enjoy! Code:
Dim DigValue As PISDK.DigitalState = Nothing
Dim PIPoint As PISDK.PIPoint = Server.PIPoints("TestDigitalTag")
If PIPoint.PointType = PISDK.PointTypeConstants.pttypDigital Then
DigValue = CType(PIPoint.Data.Snapshot.Value, PISDK.DigitalState)
Else
If PIPoint.Data.Snapshot.IsGood Then
'...
Else
DigValue = CType(PIPoint.Data.Snapshot.Value, PISDK.DigitalState)
End If
End If
Rhys. Principal Consultant
Real-Time Data Management @ Wipro Technologies
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Rank: Newbie
Groups: Member
Joined: 2/6/2010
Posts: 6
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Hi Rhys,
Thank you very much. As you said I really enjoyed with the example given by you.Here one more thing i have to clear from you " Is to possible to have the digital state of tag in 1 or 0 form?.I mean now I am getting the value as "ON or OFF". i want this in a general form '0'or'1'.
Danny
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Rank: Administration
Groups: Administration
Joined: 6/20/2008
Posts: 612
Location: Cheshire, United Kingdom.
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Hi Danny, The PISDK.DigitalState offers you couple of options for the value: - ".Name" The name of the digital state (On/Off) - ".Code" The code for the digital state (0/1) according to the StateSet. (You can check this for a StateSet in PI-SMT) In the example I posted, the "DigValue" variable will give you what you need, e.g. Cheers, Rhys. Principal Consultant
Real-Time Data Management @ Wipro Technologies
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Rank: Newbie
Groups: Member
Joined: 2/6/2010
Posts: 6
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Hi Rhys, Thank u , i got it.  Cheers,  Danny.
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