Rockwell Automation 1756-HIST2G Historian ME 2.1 - Manual (Page 273)

F • D ESIGN C ONSIDERATIONS AND L IMITATIONS
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Point Properties
This section describes settings found on the Point Property page that you should
consider when configuring tags.
G ENERAL
The General section of the Point Property page allows you to configure the following
parameters:

Typical Value is between 0 and 100

Typical Value for Digital point types is between 0 and 1

Span value range is always postive.

Zero value range is between 0 and 100
E XCEPTION F ILTERING
Exception Deviation specifies how much a point value must change before a new
value is reported. Exception Min limits how often a new event is reported. Exception
Max is the maximum length of time the system will run without reporting a new
event. Exc Max thus effectively limits the length of time that events can be discarded
because their values did not exceed exception deviation.
The Exception Filtering section allows you to configure the following parameters:

Exception Min Day and Exception Max Day is between 0 and 100.

Exception Min Hr and Exception Max Hr is between 0 and 15.

Exception Min Min and Exception Max Min is between 0 and 59.

Exception Min Sec and Exception Max Sec is between 0 and 59.

Exception Deviation range is between 0 and 100.
C OMPRESSION F ILTERING
Compression deviation is generally set to the precision of the instrument. It is set
“loosely” to err on the side of collecting data. Compression minimum sets a
minimum limit on the time between events in the archive. Compression maximum
sets a maximum limit on the time between events in the archive.
The Compression Filtering section allows you to configure the following parameters:

Compression Deviation range is between 0 and 100.

Compression Min Day and Compression Max Day is between 0 and 100.