Industry Sector, IA&DT
9.Display and operating objects
Display and operating objects are graphic elements used to design process screens. All display and operating objects behave dynamically in Runtime.
In addition, you can make the properties of objects dynamic.
An example of this is the graphic of a tank whose fill level changes in the display depending on the corresponding process value.
Another example of the dynamic behavior of an object is a button that triggers a specific function. Essentially, you can assign dynamic properties to any graphic object.
You have the following configuration options:
-The appearance of the object changes: color and flash behavior.
-The object moves on the screen.
-The object is shown or hidden.
The following additional options are available for operator controls:
-An object is enabled or locked for operating.
-Operator input, such as clicking an object, triggers an event. The configured response to this event is to work through a function list.
9.1Layers
Layers and nesting of objects within levels are used for the differential display and editing of screen objects.
A screen has 32 layers. Objects can be inserted at every layer. The assignment of an object to a layer determines the nesting of an object in the screen. Objects of layer 0 are located in the screen background, while objects of layer 31 are located in the foreground.
The objects are also staggered within each layer.
In the creation of a process screen, the objects of an individual layer are arranged by default in the order of their configuration. The first object inserted is located at the very rear of the layer. Each further object is placed one position further to the front.
It is possible to change the position of objects to each other within the layer.
There is always one active layer. When you add new objects to a screen, these are assigned to the active layer as standard. The number of the active layer is indicated in the "Layer" toolbar. The active layer is highlighted in color in the layer pane.
When you open a screen, all 32 layers of the screen are always displayed.
You can use the layer pane after opening the screen to hide all layers except the active layer. You then explicitly edit objects of the active layer.
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