Rockwell Automation 1756-HIST2G FactoryTalk Historian ME 2.2 - Manual (Page 108)

F ACTORY T ALK H ISTORIAN ME M ODULE U SER ’ S G UIDE
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Total Archive Files - the number of 10-MB archive files residing in the archive.
‡
On the 1G FactoryTalk Historian ME, approximately 40 10-MB archive files
are pre-allocated as data containers.
‡
On the 2G FactoryTalk Historian ME, approximately 130 10-MB archive files
are pre-allocated as data containers.
„
Total Archive Files Used - the number of archive files currently being used to
store data in the Archive subsystem. For a 1G model, the maximum is
approximately 40 and for a 2G model the maximum is approximately 130.
„
Total Archive Files Free - the number of archive files in the Archive subsystem
not being used to store data or containing data that can be overwritten because it
has been transferred by the Data Transfer service.
If the Data Transfer service is configured and transferring events to the
FactoryTalk Historian SE or PI server, the module will free up archive disk space
as the events are successfully transferred, increasing the number of total archive
files free and reducing the number of total archive files used.
When started, Data Collection:
„
Identifies all points listed as active (scan flag attribute set to ON) in FactoryTalk
Historian ME.
„
Identifies (or registers) all controllers in the same Logix chassis by logical names,
device IDs, and location (slot numbers). The maximum number of controllers that
are supported by FactoryTalk Historian ME is 4.
„
Begins collecting data for all points based on the specified scan rate associated
with each point.