ControlLogix Change Detect

As of v4.10, FactoryTalk AssetCentre can monitor a v20 or higher ControlLogix asset for any changes by continuous polling of the controllers. If a change is detected, AssetCentre will monitor for any additional changes for a user specified amount of time, then generate a report including all changes during this period. If changes are still occurring after the period has timed out, AssetCentre will continue monitoring by starting a new period.

Change detect is made possible by FactoryTalk AssetCentre monitoring the controller’s change log. While not as detailed as Disaster Recovery compare report, this feature is intended to provide real-time feedback on the controller’s status. The change log is a circular store inside the controller capable of up to 100 entries. In the event of changes to the controller during a disconnect, AssetCentre will immediately detect the changes upon restoration of communications, and log all changes during the disconnect period.

The Change Detect functionality has been tested with a maximum ratio of 1:500, where one agent will monitor a Change Detect schedule configured with 500 controllers.