Rockwell Automation 2706-MB1 MESSAGEVIEW 421 SOFTWARE MANUAL - Manual (Page 183)

8–6 Working with Tags
Publication 2706-817
Field Description Valid Characters Notes
Description
②
A description of
the tag
Maximum characters = 255.
•
any printable character.
Use either of these methods:
Select the box and type, or
Use the Description Editor
(see
below).
•
Do not use blanks, tabs, carriage returns or non-printable
characters.
Node Name
①
The node on the
network where
the device is
located
A node name cannot be the same as
a tag name or a terminal name.
Maximum characters = 32.
•
A to Z, a to z, 0 to 9
•
hyphen (–), underscore(_),
percent (%).
The node name must match the controller name entered in the
Communication Setup dialog. See Page 10–6.
If an invalid character is entered, the Tag Editor beeps and does
not display it.
•
Do not use blanks, tabs, carriage returns or non-printable
characters.
•
Node names cannot begin with 0 – 9, hyphen, or percent.
•
Node names are not case-sensitive: SLC, Slc and slc are all
the same to the Tag Editor.
Address
①
The data table
address in the
logic controller
for the tag Maximum characters = 32
For more information on valid
addresses, refer to the controller’s
user manual.
•
Do not use blanks, tabs, carriage returns or non-printable
characters.
Initial Value
(Numeric Entry
variables only)
The starting
value for the tag
in engineering
units, which may
not be the same
units used by
the controller. If the Data Type is a bit, enter either
•
0 or 1.
Maximum characters for other Data
Types = 24; they can be:
•
0 to 9
•
e, E, +, –, and period (.).
•
Do not use blanks, tabs, carriage returns or non-printable
characters.
•
Maximum precision is 6 places to the right of the decimal
point.
•
If present, a sign (+ or –) for the number must be first.
Default is +.
•
If present, a sign for the exponent must immediately follow the
e or E. Default is +.
•
Default initial value is 0.
Update
Frequency
How often the
terminal should
read the data in
the tag address
•
1 to 9, where 1 is the fastest
update rate.
Use either of these methods:
•
Click the down arrow and click on
the rate.
•
Use TAB to move to the Update
Frequency field, press ALT +
↓
to
display the list of frequencies.
Does not apply to Remote I/O.