Rockwell Automation FactoryTalk Historian SE 3.0 H2H Interface User Guide - Manual (Page 45)

FactoryTalk Historian To Historian Interface User Guide 39
Chapter 6.
Historian Point Configuration
The Historian point is the basic building block for controlling data flow to and from the
Historian Server. A single point is configured for each measurement value that needs to be
archived.
The following tag attributes are used for defining interface points on the receiving Historian
Server.
Point Attributes
Use the point attributes below to define the Historian point configuration for the interface,
including specifically what data to transfer.
Tag
The Tag attribute (or tagname) is the name for a point. There is a one-to-one correspondence
between the name of a point and the point itself. Because of this relationship, FactoryTalk
Historian documentation uses the terms “tag” and “point” interchangeably.
Follow these rules for naming Historian Points:

The name must be unique on the Historian Server.

The first character must be alphanumeric, the underscore (_), or the percent sign (%).

Control characters such as linefeeds or tabs are illegal.

The following characters also are illegal: * ‟ ? ; { } [ ] | \ ` „ “
Length
Depending on the version of the PI API and the Historian Server, this Interface supports tags
whose length is at most 255 or 1023 characters. The following table indicates the maximum
length of this attribute for all the different combinations of PI API and Historian Server
versions.
PI API Historian Server Maximum Length
1.6.0.2 or higher 2.x or higher 1023
1.6.0.2 or higher Below 2.x 255
Below 1.6.0.2 2.x or higher 255
Below 1.6.0.2 Below 2.x 255
If the Historian Server version is earlier than 2.x or the PI API version is earlier than 1.6.0.2,
and you want to use a maximum tag length of 1023, you need to enable the PI SDK. See
Appendix_B for information.