PI Interface for Bailey Infi90 23Chapter 7. PI Point Configuration The PI point is the basic building block for controlling data flow to and from the PI Server. A single point is configured for each measurement value that needs to be archived.
Point Attributes Use the point attributes below to define the PI point configuration for the interface, including specifically what data to transfer. This document does not discuss the attributes that configure UniInt or PI Server processing fora PI point.
Specifically, UniInt provides exception reporting and the PI Server provides data compression. Exception reporting and compression are very important aspects of data collection and archiving, which are not discussed in this document.
Note: See the
UniInt Interface User Manual and PI Server documentation for information on other attributes that are significant to PI point data collection and archiving.
Tag The Tag attribute (or tag name) is the name fora point. There is a one-to-one correspondence between the name of a point and the point itself.
Because of this relationship, PI documentation uses the terms tag and point interchangeably. Follow these rules for naming PI points The name must be unique on the PI 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 For OSIsoft interfaces that are UniInt-based, the length of the Tag attribute field is limited by the version of the PI API and the version of the PI Server. However, the BaInfi90 interface is not UniInt-based. Therefore, this interface limits the length of tagnames to be 80
characters, independent of the version of the PI API or the version of the PI Server.