A tracking region is bounded by devices (an entry and an exit transition indicator) that inform the tracking model that an item has entered or exited the region. The Region's entry and exit indicators are responsible for providing an Item's location data.
PRT requires positive identification of an item at the entry to the first region configured for a PRT process (i.e. node). Positive identification consists of the Item ID or Reference ID for Serialized Items and the Item Type for Non-serialized Items.
A Region Entry/Exit Indicator consists of
An automatic Item identifier,
An automatic Item Type detector,
A limit switch,
A User Interface transaction or
An Application Interface message.
Except for production start and production stop regions, the exit transition indicator for one region must always be configured to be the entry transition indicator for the destination region in the production line.
A full complement of the PRT configuration data resides on each Node.
Configuration data determines if an Alarm is generated when:
An Item enters a Region, and that Item occupies a location exceeding the capacity of the Region,
An Item enters a Combine Items Tracking Region, and that Item's presence in the Region exceeds the capacity of a location in the Region.
A region must be a member of at least one Tracking Region Group. All regions in a tracking group must be configured for the same PRT process service ID.
Important: Each tracking region must be associated with a primary and a secondary region type.
Production Tracking System definitions and guidelines.