During Configuration
- Primary object: The object intended as the main or central provider of the functionality in the run-time. For AppEngines, it is the object you enable for redundancy. For data acquisition, it is the DIObject you intend to use first as your data source in the run-time.
- Backup object: The object that provides the functionality of the Primary object when it fails. For AppEngines, it is the object created by the ArchestrA infrastructure when the Primary object has been enabled for redundancy. For data acquisition, it is the DIObject you do not intend to use first as your data source in the run-time.
During Run-Time
- Active object: The object that is currently executing desired functions. For AppEngines, it is the object that is hosting and executing ApplicationObjects. For data acquisition, it is the object that is providing field device data through the RedundantDIObject.
- Standby object: The passive object; that is, it is waiting for a failure in the Active object’s condition or for a force-failover. For AppEngines, it is the object that monitors the status of the Active AppEngine. For data acquisition, it is the object that is not providing field device data through the RedundantDIObject.