![Chapter 7 Programming](/images/new-backgrounds/54756/54756223x1.webp)
Chapter 7 Programming
In general, the BCU cannot pass information faster than every 5 seconds. This is the fastest a CPL routine can run. A BCU is included to collect system events, such as communication failure, and allow a user a remote connection to the system for status.
Operational priority
(UL 864: 49.10)
The following descending order of priority shall be followed in processing
1.Manual activation and deactivation commands issued at the FSCS.
2.Manual activation and deactivation commands at other than the FSCS.
3.Initial automatically actuated
4.All other manual or automatic operation used for normal building operation.
For programming purposes, the priority list in descending order is:
1.Any manual control of dampers, fans, and smoke control panel control.
2.Automatic smoke control system reaction.
3.System test processes such as normal HVAC control, lamp tests, or system
All of the above priorities refer to performance, not annunciation. For instance, if a lamp test is running and a user overrides one of the dampers, the annunciation (LED) may not change while the actuator moves. In this case, the lamp test is not affecting system performance, just annunciation. However, if a system
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