This value appears on displays, trend and dialog boxes describing the intended maximum value of the tag. For some Scaling Types, this is a hard limit. For No Scale and other scaling types, it is an indication only that may be ignored
Span Hi is used by some Scaling Types to "re-scale" the value read from the PLC. For some Scale Types, Span Hi is the maximum value of the Tag. For other Scale Types, SpanHi is for display use only. For example, if No Scale is selected, the Span appears on Trends and Displays, but is informational only. The actual value can exceed Span Hi if no scale is used. (See Scaling Type for more details).
Span Hi is used by Trends, Overviews, and user built animation to determine the Maximum Value of the Tag. For example, if a tank is filled by a Tag, the Hi Span is used to determine the tag' value for a Full Tank.
-99,999,999,99 to 99,999,999,999
Field Type: analog
Tag field: .SPANHI