Applications Guide Tracer Graphical Programming - Trane

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Chapter 7, “Constant-volume AHU example”
Chapter 7, “Constant-volume AHU
example”
1. A universal input configured as a a binary input must be selected as
the occupancy sensor input in the Schedule application. See
Figure 197.
Figure 197: Schedule application occupancy inputs
2. The Occupancy block, used in both the modes and setpoints program
and the fan control program, provides the occupancy mode of the controller.
Remember, the Occupancy block outputs one of four states,
which is determined by the Schedule application for the controller:
0 = Occupied
1 = Unoccupied
2 = Occupied Bypass
3 = Occupied Standby
When the controller enters occupied bypass mode, the Occupancy
block outputs a value of 2. Take a closer look at the application of the
Occupancy block in the modes and setpoints program (Figure 158 on
page 182). The associated De-Enumerator block is setup to distinguish
between occupied standby and unoccupied modes. In occupied
and occupied bypass modes, the Switch block remains at its normally
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