Rockwell Automation 2706-MB1 MESSAGEVIEW 421 SOFTWARE MANUAL - Manual (Page 225)

10–17 Terminal and Communication Setup
Publication 2706-817
Trigger Priority
Two or more messages may be triggered at the same time and
contend for the same display line(s). See the section on triggering
that starts on Page 4–9.
•
If the messages are value-triggered, priority is determined by
which Message Number is entered into the Value Trigger address
first.
•
If the messages are bit-triggered, priority is determined by the
lowest set bit in the Bit Trigger tag.
•
If one message is value-triggered and one is bit-triggered, priority
is determined by this option, the Trigger Priority global attribute:
– if Bit is selected, the message with a bit trigger is displayed
and the one with the value trigger is queued (if the Message
Queue is enabled)
– if Value is selected, the message with a value trigger is
displayed and the one with the bit trigger waits. If the bit is
still set when the value triggered message is terminated, its
message is displayed.
Note: Bit triggering cannot be used by an ASCII Triggering device,
so this option must be set to value trigger.
Startup Message
Enable this option if a certain message should be displayed whenever
the terminal powers up.
•
Select the message number in the spin control.
•
Or highlight the current number and type the selected number.
Background Message
Enable this option if a certain message is to be displayed after 2
seconds in which no active message is displayed.
•
Select the message number in the spin control.
•
Or highlight the current number and type the selected number.
Note: ASCII Triggering applications do not support Startup or
Background Messages with embedded display variables.
The terminal operator can use the Front Panel Editor to change the
Startup and Background Messages.