Rockwell Automation 2706-M1 MESSAGEVIEW 421 HARDWARE MANUAL - Manual (Page 62)

4–2 Running Applications
Publication 2706–816
Message contents
Messages and their contents are displayed when triggered by a
controller. Messages may contain:
•
alphanumeric text
•
data entry variables
•
data display variables
•
graphics
•
time and date.
Messages may contain ASCII display variables. An ASCII display
variable informs an operator of the status of a control process. These
variables may receive their information from either a controller or an
ASCII Input device.
An example of a typical display with an ASCII variable is:
VALVE IS
CLOSED
where CLOSED is the ASCII variable.
The application determines the maximum length of the ASCII
display field, from 1 to 32 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).
Messages may contain numeric display variables. A numeric display
variable informs an operator of the status of a control process. These
variables may receive their information from either a controller or an
ASCII Input device.
An example of a typical display with a numeric display variable is:
WATER TEMP
= 550 Deg C
where 550 is the numeric display variable.
Messages with
ASCII Display Variables
Messages with
Numeric Display Variables