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PI Universal Interface UniInt Framework

Set delays for cold failover

  • Last UpdatedApr 03, 2023
  • 1 minute read

In a cold failover configuration, you can configure delays that ensure that the interface instances update their status in a coordinated way, to prevent one or the other from being locked into the role of backup.

Consider setting delays if you need to run the interface on an unreliable network where the communication between the interface and the data source is disrupted on a regular basis. On a robust and reliable network, you do not need to set delays.

To configure delays, set the following attributes of the active ID failover point:

  • location3

    Specifies how long to wait after assuming the backup role before resuming the primary role and resetting status.

    Default: location3 set to 0 (cold failover is disabled).

  • location4

    Specifies how long to wait before assuming the primary role if the other instance has a bad status.

    Default: location4 set to 0 (5 minutes).

  • location5

    When both the primary and backup interface instances have equally bad device status, specifies how long to wait before the backup transitions to primary.

    Default: location5 set to 0 (10 minutes).

    For more information, see Failover status points and attributes.

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