Rockwell Automation 2706-M1 MESSAGEVIEW 421 HARDWARE MANUAL - Manual (Page 69)

4–9 Running Applications
Publication 2706–816
The MessageView 421F terminals (Catalog No. 2706-M1F1 and
-M1F) support 16 function keys [F1] to [F16] on the front panel to
control the operation of an application.
Function Key Operation
Function keys are active only when they are associated with (enabled
for) a displayed message.
While a message associated with a function key [F1] to [F16] is
active, pressing that function key sets or clears a bit value assigned to
the function key’s write tag address. The controller logic program
can use the function key’s write tag address for a variety of control
operations such as a machine start/stop functions.
!
ATTENTION: Do not use a MessageView terminal
for emergency stops or other controls critical to the
safety of personnel or equipment. Use separate
hard-wired operator interface devices that don’t depend
on solid state electronics.
The MessageView terminal supports three types of function key
operations.
•
momentary
•
maintain
•
latch
Each function key operation supports two message modes:
•
non-jog mode
•
jog mode
Function Keys