Rockwell Automation 1756-HIST2G FactoryTalk Historian ME 2.2 - Manual (Page 314)

F ACTORY T ALK H ISTORIAN ME M ODULE U SER G UIDE
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Attribute, Point A characteristic or parameter of a point that directs an interface
and the FactoryTalk Historian ME server in the collection and
processing of data values for that point.
Available Licensed
Points The number of licensed points minus the total number of points
already tagged for transfer. This includes tagged points from
all modules that are set up to transfer data to the same PI
server.
Chassis The hardware assembly that houses the FactoryTalk Historian
ME module, ControlLogix processors, and other I/O modules.
Common Industrial
Protocol (CIP) An open industrial communication network initially created by
Allen-Bradley/Rockwell Automation.
CompDev The base attribute that specifies the compression deviation in
engineering units. This attribute specifies how much a value
may differ from the previous value before it is considered to be
a significant value.
CompMax The base attribute that specifies the compression maximum
time, in seconds. CompMax is the maximum time difference
from the previous archive event before the next event will be
sent to the archive. A point is archived if the elapsed time since
the previous time a point was saved is greater than the
maximum time.
CompMin The base attribute that specifies the compression minimum
time, in seconds. CompMin is the minimum time difference
from the previous archive event before the next event is
eligible to be archived. A point is archived if the elapsed time
since the previous time a point was saved is greater than or
equal to the minimum time and the value has changed by more
than the deviation.
Compression The process of selecting which Snapshot events will be sent to
the Archive for storage. Applying compression is one of the
main responsibilities of the Snapshot subsystem, and the
specific algorithm used is known as Swinging Door
Compression.
Compression Deviation See CompDev.
Term Definition