Maple Systems OIT Family - Manual (Page 69)

Function Keys
Every global and screen-dependent function key on the OIT can be programmed to
display a stored screen. Whenever the function key is pressed, the corresponding screen
is immediately displayed, unless an alarm is active or a security password is being used.
For more information on configuring function keys, refer to CHAPTER 6: Key Types.
NOTE:When a function key displays an alarm or help screen, the screen is treated like a simple
message screen.
Menu Selection
Menu screens allow the OIT operator to branch off to other message, recipe, or menu
screens by pressing the associated numeric key. Each menu screen can branch to as many
as nine other screens using the 1 through 9 keys. For more information on configuring
menu screens, refer to the Menu Screens section in CHAPTER 3: Stored Screens.
Message or Menu Chain — Page Up & Page Down Keys
Message or menu screens can be chained together to form multiple screen messages or menus.
This allows a group of screens to be displayed with only one PLC screen request, or one
function key press, or one menu selection. For more information on configuring message/menu
screen chains, refer to the Screen Chain section in CHAPTER 3: Stored Screens.
The PAGE DOWN and PAGE UP keys are used by the OIT operator to view the screens
in a chain. PAGE DOWN is used to view the next screen in a chain; PAGE UP is used to
view the prior screen.
NOTE:The PAGE UP key is not available on the OIT3160 or OIT4160.
Three special symbols are used in the screens to indicate to the OIT operator which screen
in the chain is being displayed. The “->” symbol is used in the first screen, the “<->”
symbol is used in the middle screens, and the “<-” symbol is used in the last screen.
Screen Stack — Last Msg & Next Msg Keys
The OIT has a screen stack that temporarily stores up to 10 screens requested by either
the PLC or OIT. The following are not stored in the screen stack:
• alarm screens requested by the PLC
• help screens requested by the HELP key
• any screen requested by a function key that uses a password
• startup screen
• screen saver.
The LAST MESSAGE and NEXT MESSAGE keys are used to view the messages in the
screen stack. There are two available screen stack operating modes: Standard and Stacked.
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