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Unity Pro has a Project Setting "Upload information management" that can be found under the menu bar title "Tools", then General >> PLC embedded data.
It supports the ETS (Empty Terminal Support) feature of Unity Pro. The ETS feature allows users to connect any PC, with Unity Pro installed, to a Unity PLC and upload its project.
This feature has two selections available, "Automatic" (default selection) and "On user request". The selection of this feature has a direct impact to the on-line editing time of the Unity Pro project.
In this mode, every application edit that is made and build changes performed is downloaded to the PLC and the uploadable application image is updated on the PLC. This automatically maintains consistency between the PLC executing code and the upload image of that code after every edit/ build changes is performed. This status can be seen on the Unity Pro Status Bar after the edit and build changes is completed.