Rockwell Automation Logix5000 Controllers I/O and Tag Data Programming Manual - Manual (Page 53)

Organize tags Chapter 2
For more information on handling major faults, refer to the Logix5000
Controllers Major and Minor Faults Programming Manual , publication 1756-
PM014 .
The table outlines the four types of tags that you can create and the descriptions
that you can document for each one.
Important: The Logix Designer application automatically assigns what are called pass-through descriptions of the tags
you create. You may or may not want to use these descriptions.
Tag Description
Base When you create a tag without specifying a tag type, the Logix Designer application automatically
assigns your tag a default type of Base. Since base tags enable you to create your own internal data
storage, you can document in your tag description the nature of the data being stored.
Alias By creating an alias tag, you can assign your own name to an existing tag, structure tag member, or
bit. In the description of your alias tag, you can describe the tag that your alias tag references.
Produced A produced tag refers to a tag that is consumed by another controller. In the description of your
produced tag, you can describe the remote controllers that you want to make your produced tag
available through controller-to-controller messaging.
Consumed A consumed tag refers to a tag that is produced by another controller and whose data you want to use
in your controller. In the description of your consumed tag, you can describe how you want to use a
produced tag’s data or the data-producing controller.
Project documentation
With version 17 and later of the Logix Designer application, you have the option
to display project documentation variables for any supported localized language,
such as:
• Component descriptions in tags, routines, programs, equipment phases,
user-defined data types, and Add-On Instructions.
• Engineering units and state identifiers added to tags, user-defined data
types, or Add-On Instructions.
• Trends.
• Controllers.
• Alarm messages (in configuration of ALARM_ANALOG and
ALARM_DIGITAL tags).
• Tasks.
• Property descriptions for a module in the Controller Organizer.
• Rung comments, Sequential Function Chart text boxes, and Function
Block Diagram text boxes.
Tag documentation
Rock well Automati on Publication 1756- PM004E -EN-P - October 2014 53