User Manual

Alarm management

Effects of BACnet properties on alarm response

144 | 351 CM110664en_07

Given the feedback signal [FbVal] Fully open, the Open and Close commands follow the time sequence

shown below, making use of all three deviation monitoring times [TiMonDvn].

Since the BO block can handle the feedback of two different addresses, the fire-protection damper solution

can be further simplified by direct connection of the Closed switch (Addr. 1) and Open switch (Addr. 2). In

cases where both end switches are simultaneously On or simultaneously Off, the BO block treats the

[FbVal] as invalid. Throughout this period, therefore, the alarm monitoring function will return the value

Alarm = OFFNORMAL. The circuit and time sequence for normal and error conditions are as follows:

Circuit and time sequence for normal and error conditions: