Rockwell Automation 2706-M1 MESSAGEVIEW 421 HARDWARE MANUAL - Manual (Page 63)

4–3 Running Applications
Publication 2706–816
Numeric display variables may have:
•
leading zeros
•
maximum of 4 decimal places (for example, 0.1234)
•
fixed, floating or no decimal point
•
different field widths (1 to 12 digits)
•
scaled data
Numeric variables may be displayed as a scaled value if this option
is specified in the application. Scaling allows the operator to view
machine control values in standard engineering units such as
_C, psi,
or lbs. Scaling is described in the section starting on Page 4–6.
The application determines the maximum length of the Numeric
Display field, from 1 to 12 characters.
MessageView terminals support a maximum of 10 embedded
variables of all kinds per message. Each message may have up to 100
characters (combined text, graphics and variables).
MessageView terminals support one time and one date variable per
message. Time and date variables occupy 10 character spaces each.
Time and date variables can be displayed with or without supporting
text.
ASCII Entry variables are used primarily to enter data from an
ASCII Input Device. They may also be used, when defined as
integers, to enter data from the terminal keypad.
If the ASCII Entry variable is defined as:
•
an integer (signed or unsigned) the entered data is displayed in
numeric format. It may be scaled like data in a Numeric Entry
variable.
•
a character array, the entered data is displayed in alphanumeric
format. It cannot be scaled.
MessageView terminals which support ASCII Entry variables may
be connected to an ASCII Input Device through the RS-232 port.
ASCII Input devices include:
•
bar code scanners
•
AdaptaScan bar code readers
•
PLC Serial Port 0.
The ASCII Input device may send either alphanumeric or numeric
data.
Note: The connection between the ASCII Input Device and the
MessageView terminal is ASCII, not Simplex.
Messages with Time or
Date Displays
Messages with
ASCII Entry Variables