Rockwell Automation 2706-MB1 MESSAGEVIEW 421 SOFTWARE MANUAL - Manual (Page 84)

4–36 Planning an Application
Publication 2706-817
Read or Write tags that define controller addresses for variables are
entered in the Tag Editor. See Page 8–2. A tag has the following
attributes:
Tag Attributes Description
Tag Name Unique name identifying tag address
Data Type Bit, BCD, Unsigned/Signed Integer, Character Array
Array Size
Number of elements in a character array.
For other data types, leave blank.
Description General description of the variable
Node Name
Name of the logic controller that will store the
address
Tag Address Specifies word or bit location in controller memory
Initial Value Value in tag address at powerup
Update Frequency
How often the tag address will be updated while the
operation is running
Scaling
➀
Scale and scale offset values
Data Entry Limits
➀
Upper and lower limits of data stored at tag address
➀
Usage depends on the variable. These attributes can be entered only in the Form View.
The Tag Editor supports two different methods for entering tags:
•
Table View for entering multiple tags.
•
Form View for entering a single tag.
Table View Form View
Tags are stored in a database that is referenced by a project name.
The project name is entered when creating a new application file.
Note: A project can be created only when a new application is
created. However, once it has been created, existing or new
applications may be assigned to it.
Defining Tags