4.8.59         .SPAN50

Half Scale (50% of full Scale).  Used in widgets and faceplates to provide intermediate markings to scales for the tag.   WebAccess automatically calculates this from SPANHI and SPANLO

SPAN25 = .5(SPANHI - SPANLO) + SPANLO

Range:-99,999,999,99 to 99,999,999,999
Field Type:    analog
Tag field:       .SPAN50 - read only