Maple Systems OIT Family - Manual (Page 71)

There are two ways to inform the OIT operator when new screens are in the stack:
• Embedding the Message Stack Size register monitor in each screen. For more information
on using this register monitor format, refer to CHAPTER 4: PLC Register Monitors.
• Using the Message LED on the OIT3250, OIT4450, or OIT5400. For more information on
this LED, refer to CHAPTER 8: Using the LEDs.
To configure the screen stack for Stacked mode:
1. From the Configuration menu, choose Message Control Settings. The OIT Message
Control Settings dialog box appears.
2. In the Message Request Register group box, select the Enable Message Stack group box.
3. Choose the Done button to return to the OITware-200 main screen.
Help Key
Each message, recipe, or menu screen can have one help screen assigned that is displayed
whenever the OIT operator presses the HELP key. The help screen remains on the
display as long as the HELP key is pressed. When the HELP key is released, the prior
screen reappears. If the HELP key is pressed for a screen that does not have an assigned
help screen, an error message is displayed. For more information on configuring a help
screen, refer to the Help Screens section in CHAPTER 3: Stored Screens.
Screen Saver
The screen saver is a single line of up to 128 characters that can be configured to display
whenever there has been no keyboard activity or PLC screen request for a predefined length
of time. Although originally designed to prevent phosphor burn on vacuum fluorescent
displays, the screen saver is an option available for all OIT Family Operator Interface
Terminals. The single line of text scrolls across the top line of the display at a rate of two
characters per second until the OIT operator presses a key or the PLC requests a screen.
To enable the screen saver:
1. From the Configuration menu, choose General Settings. The OIT General Settings
dialog box appears.
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