Question:
How can I perform a Sequence of Events (SOE) in E3?
Solution:
This can be done in two ways: via alarms settings, or via I/O Driver’s OnTagRead event.
How can I use I/O Driver’s OnTagRead event?
Just check the tags’ EnableDriverEvent property, and the value changes will fire I/O Driver’s OnTagRead event. This event allows you to take any bit of information regarding these tags and then perform writing in the database. For example:
Sub Driver1_OnTagRead(Tag)
set tagint = Application.GetObject(“Data.InternalTag1″)
tagint.DocString = Tag.Name
tagint.Value = Tag.Value
tagint.TimeStamp = Tag.TimeStamp
tagint.Quality = Tag.Quality
Application.GetObject(“Hist1”).WriteRecord()
End Sub
set tagint = Application.GetObject(“Data.InternalTag1″)
tagint.DocString = Tag.Name
tagint.Value = Tag.Value
tagint.TimeStamp = Tag.TimeStamp
tagint.Quality = Tag.Quality
Application.GetObject(“Hist1”).WriteRecord()
End Sub
In the example above, InternalTag1’s DocString, Value, TimeStamp, and Quality properties are the fields in Hist1.
NOTE: Don’t forget to uncheck the historic’s scan recording by setting ScanTime = 0.
