The base and front layers are generated to separate objects in the drawing order, from the first part or drawing set up with animation, and the rest of the parts and drawings. Objects in the front layer display overtop objects in the base layer.
Objects that do not support animation cannot exist in the front layer; therefore these objects, regardless of the drawing order, are placed in the base layer.
No matter what animation settings you use, if you set the [Plate Color] transparent on Data Display or Message Display parts, it will appear on the front layer.
Too many objects in the front layer may reduce the speed of the display's redrawing speed.
See the following for information on changing the position of the layer separator to improve the display's redrawing speed.
20.7.5 Project Information - File Information - Expert Mode Settings Guide
When a switch is set up with [Reverse Display] and animation, there is a slight delay for it to reverse.
If objects overlap each other on the front layer, or an object on the front layer overlaps an object on the base layer, Reverse Display does not occur when you touch the overlapped portion.
If there is a layer separator for loaded parts, the separator is applied at the first layer separator in the drawing order, including called screens.
The front layer or D-Script set for call screens or Trigger Action will be executed after the last part on the base layer.
When any of the following parts overlap - Data Display part (Numeric Display, Text Display, Date/Time Display), Graph, Historical Trend Graph, Block Display Graph, or Switch/Lamp - and animation is set to objects on the base layer, objects that are not animated will display behind the animated object right after a screen change.
If there is a layer separator set in the header, all animated parts on the base screen with the header will be placed on the front layer.