Application

Room Automation Overview
Operating Modes
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Siemens Industry, Inc.
Application Note
A6V11692055
Smart Infrastructure – Building Products
2019-04-01
Operating Modes
Room operating mode (ROpMod) is determined by central functions (for example,
scheduler) and can be overwritten by a local presence button on the room unit. The
room operating mode is a multistate BACnet Object that supports the following
room operating conditions:
⚫ Comfort (occupied)
⚫ Pre-Comfort (standby offset)
⚫ Economy(unoccupied)
⚫ Protection (extended unoccupied period)
Plant operating mode (PltOpMod) is determined by the room operating mode and
can be overridden by central request for Warm-up, Cool down or Night cooling, and
so on. The plant operating mode is a multistate BACnet Object that supports up to
17 different plant operating modes. Rooms typically use the following plant
operating modes; Off, Comfort, Pre-Comfort, Economy, Warm-up and Cool down.
HVAC device mode determination – The plant operating mode is used to
determine the device mode (the operating state) for each HVAC device controlled
in the room segment. The HVAC device mode is a multistate BACnet object that
supports the operating states of HVAC devices. Typically each device is assigned
operating modes (for example, Off, Control mode, Fully Open). When the HVAC
device is in Control mode it is under the control of the Room HVAC coordination
functions. For additional information see ABT Site Help, Technical principles >
Operating modes .
Example: VAV application including Lights and Blinds.