Failover status points

UniInt failover tracks status using the following PI points:

• Active ID

  Tracks which interface instance is currently forwarding data from the data source to Data Archive. If the backup instance detects that the primary instance has failed, it sets the active ID point to its own failover ID and assumes responsibility for data collection, becoming the primary.

• Heartbeat for UFO instance 1

  Enables the backup interface instance to detect whether the primary instance is running.

• Heartbeat for UFO instance 2

  Enables the primary interface instance to detect whether the backup instance is running.

• Device Status for UFO instance 1

• Device Status for UFO instance 2

  Displays interface status.

  Device status point values

  Device Status	Description
  0	Interface working properly, reading/writing data
  10	Connected to device, not receiving data
  30-70	Interface-specific error; consult interface manual
  90	Starting interface, not connected to device
  95	Communication error with device
  99	Shutting down the interface

  Note: Device status points are different than the UniInt health device status points. The information in the two point types is similar, but failover device status points are integer values and the health device status points are string values.

  Heartbeat point values

  Value	Status
  1 - 15	The interface instance is running. This value cycles through 1 - 15 based on the rate specified by the failover update interval.
  17 - 31	The interface instance has lost its connection to Data Archive. This value cycles through 17 - 31 until the connection is restored.
  0	The interface instance is in a normal shutdown process.