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BACnet COV Throttling
Enable COV Throttling
Trend Sampling
Collect a daily midnight
sample for all points in this
controller that are sampling
on COV
Device
On the Device page, you can view the following properties:
•
BACnet device object properties for the Zone Ctrl II
•
Zone Ctrl II network communication
Configuration
Max Masters and Max Info
Frames
Zone Ctrl II and
VAV Zone II Secondary Duct Installation and Start-up Guide
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Under normal circumstances, COV Throttling should be enabled to prevent
excessive network traffic if an object's COV Increment is set too low. See
EXCEPTION below.
When enabled, if an object generates excessive COV broadcasts (5 updates in 3
seconds), the driver automatically throttles the broadcasts to 1 per second. Also,
if the object's value updates excessively for 30 seconds, an alarm is sent to the i-
Vu® application listing all objects that are updating excessively. A Return-to-
normal alarm is sent only after all objects have stopped updating excessively.
EXCEPTION: In rare circumstances, such as process control, a subscribing object
may require COV updates more frequently than once per second. For these
situations, clear this checkbox, but make sure that your network can support the
increased traffic. You will also need to disable the Excessive COV alarms under
the driver's Common Alarms.
For values that change infrequently, select to verify at midnight daily that the
point is still able to communicate trend values.
NOTE The three APDU fields refer to all networks over which the Zone Ctrl II
communicates.
Apply only if the Zone Ctrl II is on an MS/TP network.
37
To set up the driver
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