Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 185)

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Working with tags
This chapter describes:
 Data server tags, HMI tags, and their attributes.
 Using tag data in a FactoryTalk View Site Edition application.
 How tag references work.
 Parts of the Tag Browser.
 Searching for and selecting tags.
 Browsing for offline tags.
 What HMI tags are.
 How to organize HMI tags.
 Parts of the HMI Tags editor.
 Creating, modifying, and deleting HMI tags.
 Selecting a data source for HMI tags.
 Creating HMI tags without using the Tags editor.
 Defining alarm conditions for HMI tags.
About data server tags and HMI tags
FactoryTalk View Site Edition conforms to the OPC-DA 2.05a specification for
exchanging data among automation or control applications, field systems or devices, and
business or office applications.
A tag is a logical name that represents a variable in a network device or in a computer’s
memory (RAM). In FactoryTalk View Site Edition , you can use two types of tags:
 Data server tags (also called direct reference tags, or data items in the OPC-DA
specification) provide direct access to the basic attributes of all OPC-DA-compliant
tags, through data servers you add to an application.
 HMI tags provide additional properties for run-time security and data manipulation.
HMI tags are created in the Tags editor and stored in an HMI server’s tag database.
For information about HMI tags, see sections in this chapter starting on page 10-16