Rockwell Automation FactoryTalk Historian SE 3.0 H2H Interface User Guide - Manual (Page 62)

Startup Command File
56
History Recovery Tab
Maximum hours of history to recover
Number of hours to recover history for all points. Setting the value to 0 disables history
recovery for all points. See section
History Recovery for more information about history
recovery. ( /RH=hours )
The Use Default button is used to reset the value to the default setting of 8 maximum hours of
history to recover.
Hours of history to recover per cycle
This is the number of hours of history to recover in each cycle through the point list. If the
number of hours specified in the Hours of history to recover per cycle box is greater than or
equal to the hours of history recovery requested in the Maximum hours of history to recover
box, history will be recovered in one archive call from *- Hours of history to recover per
cycle hours to *. If Maximum hours of history to recover is greater than Hours of history to
recover per cycle, the archive calls to retrieve history will be divided into N calls, where N =
Maximum hours of history to recover / Hours of history to recover per cycle + 1. The calls,
which start from (*-Maximum hours of history to recover), will each span Hours of history to
recover per cycle hours. Each history increment is collected for all tags in the given scan
class before the next time increment is begun. If this field is set to zero, the default 24 hours
will be used. (
/RH_INC=hours )
The Use Default button is used to reset the value to the default setting of 24 hours for the
number of Hours of history to recover per cycle.