# Screens
OI applications are composed of a number of screens. Each screen provides an independent display of components and functionality. Screen selectors provide the operator a method to change screens, while that application's control tags provide a method for the PLC to change screens.
# Start Screen
To set the screen that appears when first loading an application, set the Startup Screen setting in Application Settings dialog to the number of the screen.
# Changing Screens
Operators can change screens using Screen Selector buttons.
Screens can also be changed through tags by setting the Screen Number control tag,
# Restricting Screens
Screens can require authorization either through a username/password or through an RFID swipe. More details on this are found in the User Access page.
# Duplicate Components
OI provides a utility to quickly find duplicate components on a screen. Duplicate components can degrade performance and result in unexpected behavior. This can occur when using copy/paste extensively.
To select duplicate components click on "Select Duplicate Components" under the Screen menu. This will select all components that appear to be duplicates (components that share all properties but may have different values for 'name').
Note
This feature is available in OI versions 1.11 Dec 2020 and newer.
# Screen Properties
| Property | Values | Description |
|---|---|---|
| name | string | Provide a name for the component. This can be helpful when using the "Used Components" tool in the tag editor. |
| description | string | A space to provide a description of the current component, useful for documenting intent. |
| authorize | freeAccess, useLoggedUser, onEachAccess | Determines access protections for this component. More info: User Access |
| allowedGroups | int | Integer value for which groups should be allowed to interact with this component. More info: User Access |
| accessTimeout | seconds (int) | (deprecated) When set, this will persist authorization for access to the component for the time specified. More info: User Access |
| accessPassword | string | (deprecated) When set, this password is required to use the component. More info: User Access |
| backcolor | color | Sets background color. Images are allowed to set this to transparent to support images with alpha masks. |
| screenNumber | int | This defines the number value for this screen. Used in goto-screen selectors, and in the application control and status tags to communicate current screen information to a PLC. More info: Screens |
| grid | x, y | (deprecated) Defines the x/y spacing of grid in OI. More info: Screens |
| allowPLC | true, false | Defines whether a PLC can override the User Access system when calling this screen. More info: User Access |
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