BACNET HEARTBEAT COMMUNICATION STATUS AND STAND-ALONE
OPERATION
The FBVI-2U4-4T can monitor its communication status with the master controller. If this feature is
enabled, the box will be put into a failsafe mode if communications are lost.
To use this feature, set binary set point enableHeartbeat (D307) to On (default is set to off). The master
controller must write a value of On to binary set point heartbeatPulse (D306) more frequently than the
time delay setting in analog setpoint heartbeatTimer (A408) (do not use less than 5 minutes, default is 10
minutes).
After the time delay expires, if no writes are seen, commAlarm (D273) will be set to On indicating a
communications loss.
During a communications loss state, the FBVI-2U4-4T will be set to the following:
• Occupied
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