Rockwell Automation 2706-MB1 MESSAGEVIEW 421 SOFTWARE MANUAL - Manual (Page 184)

8–7 Working with Tags
Publication 2706-817
Field Description Valid Characters Notes
Scaling
③
Scale = ‘m’
in y = mx + b
Offset: = ‘b’
in y = mx + b
The values that
convert the tag’s
controller integer
values (“x” ) to
engineering
units (“y”)
Maximum characters = 12
•
0 to 9
•
e, E, +, –, and period (.)
•
Do not use blanks, tabs or carriage returns.
•
Maximum precision for scale is 4 places to the right of the
decimal point.
•
Maximum precision for offset is 6 places to the right of the
decimal point.
•
If present, a sign (+ or –) for the number must be first.
Default is no sign, which represents +.
•
If present, a sign for the exponent must immediately follow the
e or E.
Default is no sign, which represents +.
Data Entry
Limits
③
70
The minimum
and maximum
values that the
operator can
enter for the tag
Maximum characters = 12
•
0 to 9
•
e, E, +, –, and period (.)
•
Do not use blanks, tabs or carriage returns.
•
Maximum precision is 4 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 +.
①
Required fields for either Table View or Form View.
②
To bring up the Description Editor:
1. Select the Description field.
2. Click the right mouse button.
3. Choose Editor from the menu that appears.
4. When finished entering the description, select OK.
③
Scaling and Data Entry fields
In Form View, these fields are present only when the Data Type is signed/unsigned integer or BCD.
In Table View, these fields are not present.