Archive Compression Example: Archive Compression of a Ramping Tag
An iFIX tag is associated with an RA register. This value ramps up to 100 then drops immediately to 0.
Assume a 5-second poll time in Historian. How much archive compression can be performed to still "store" the same information?
With an archive compression of 75%, 25% or 5%, only the change in direction is logged:
11-Mar-2003 19:31:40.000 0.17 Good NonSpecific
11-Mar-2003 19:32:35.000 90.17 Good NonSpecific
11-Mar-2003 19:32:40.000 0.17 Good NonSpecific
11-Mar-2003 19:33:35.000 91.83 Good NonSpecific
11-Mar-2003 19:33:40.000 0.17 Good NonSpecific An archive compression of 0% logs every incoming sample. Even on a perfectly ramping signal with no deviations, 0% compression conserves no storage space and essentially disables archive compression.