Rockwell Automation 2706-MB1 MESSAGEVIEW 421 SOFTWARE MANUAL - Manual (Page 152)

7–31 Creating Messages
Publication 2706-817
When a variable is created or edited, its dialog appears:
Format
The Field Width spin control specifies the maximum number of
alphanumeric characters that can be entered in the variable.
Note: The message will not pass Validation if the Field Width is
greater than the Write Tag’s Character Array value.
Default is 32. To change the field width (range 1 to 32), select or
enter a value in the spin control.
Note: If the input device sends more characters than fit in the Field
Width, the extra characters are ignored.
Tags
The Write Tag list box specifies the name of the tag address to
which the terminal will write the entered data. Select a tag from the
Write Tag list box or enter a new Write Tag name. The only valid
data type is Character Array.
The Notification Tag list box specifies the name of the tag address
where the terminal sets a bit to 1 when a value is sent to the logic
controller.
Handshake Tag list box specifies the name of the tag address where
the controller sets a bit to 1 when a notification has been received.
Select these tags from their tag list boxes or enter new tag names.
The only valid data type for either Notification or Handshake tag is
bit.
Note: Use both Notification and Handshake Tag, or neither. See the
section on handshaking on Page 4–26. If only one tag is entered, the
application will not pass Validation.
Note: It is easier to create an application if all its tags are entered in
the Tag Editor before you start to write messages. If a new tag name
is used, its parameters must be edited when it is assigned.