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Manual Recalculation and Bad Offline Values

Cygnet collector supports Manual recalculation of tags. The Cygnet collector by default will add a bad offline value when the collector is started. To disable this feature, add the following registry key to HKEY_LOCAL_MACHINE\SOFTWARE\Intellution, Inc.\iHistorian\Services\CygnetCollector\<entry>

WriteBadOfflineAtStartup (DWORD) – set this to ‘0’ to disable adding the bad offline at startup.
DeleteBeforeRecalc (DWORD) – By default, before performing a recalculation on an interval, the collector will delete any previously stored values in Proficy Historian. To disable this feature, set this key to ‘0’

The Cygnet collector also inserts a bad offline while a tag is modified. It may stay as the current value until new values are read from cygnet the by collector.