I have a UDT which has several incoming data values and a number of expression tags, some of them reference other expression tags within their expression formula. As the incoming data values are from a cellular connection, the scanclass used only runs this UDT once every fifteen minutes. Therefore it is critical to know what order the expressions are executed, otherwise the resultant values might not be correct until it the next scan, at which point we’d have new incoming data. Executed incorrectly, we’d be mixing last scan’s data with the current scan’s data which would thoroughly cock things up.
SO: Is there a way to force an execution order, or at least tell what the order is??