On scan/off scan states

An object whose status is On Scan is performing its normal processing, while an object whose status is Off Scan is considered idle and not available for execution.

Some conventions apply for objects starting and running on scan and off scan. For example, engines can only run on scan when the status of the platform that hosts the engine is also running on scan. Or, platforms can only be shut down after the engines that are hosted by the platform are placed off scan.