Installation & Operation Manual - Model AVC5000
Contents of this Manual are Subject to Change Without Notification
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7.3 Unsubscribed COV
The AV2 object Present_Value shall specify an interval in whole seconds at which the AVC shall
periodically issue Unsubscribed COV Notifications as local segment broadcasts. An AV2 value of
zero shall disable this behavior. When non-zero, the Unsubscribed COV shall also be issued if
the Present_Value of any object AI1, AI2, AI3, AV1, or AO1 changes by more than the
COV_INCREMENT for the corresponding object. If COV_INCREMENT is zero for a given object, it
shall also disable Unsubscribed COV for that object, even if AV2 is non-zero.
7.4 COV
The AVC supports a pool of 40 subscription resources that may be applied to track COV
subscriptions for change of value of any of the objects AI1, AI2, AI3, AI4, AI5, AI6, AI7, AV1, or
AO1. Each subscription shall include the objectID, the last transmitted value, the remaining
subscription lifetime in seconds, the subscriber process ID, a flag indicating whether confirmed
or unconfirmed notifications should be used and the (network number, MAC address) of the
subscriber.
