Application

Sequence of Operation
Room Temperature Offset
29
Siemens Industry, Inc.
BACnet LCM-OAVS, Application 6754
140-1325
2015-07-07
The application also uses CTL TEMP as the temperature input for the Room
Temperature PID Loop. When CTL TEMP is not overridden, then:
CTL TEMP = ROOM TEMP + TEMP OFFSET.
Room Temperature Offset
NOTE:
The Room Temperature Offset feature is optional.
TEMP OFFSET is a user-adjustable offset that will compensate for deviations between
the value of ROOM TEMP and the actual room temperature. This corrected value is
displayed in CTL TEMP.
CTL TEMP = ROOM TEMP + TEMP OFFSET
Example
If the actual room temperature is 72.0°F, and the value of ROOM TEMP is 73.0°F, then
the value entered into TEMP OFFSET is
-1.0. In this case, the value of ROOM TEMP
would read 73.0°F, but the value of CTL TEMP would read 72.0°F.
Room Unit Identification
 For Analog Room Units (Series 1000) – The revision number is visually identified
by its case.
 For Digital Room Units (Series 200/2300 Firmware Revision 25 or earlier) – The
revision number displays for 5 seconds when the room unit is first powered up.
These room units will display laptop when a laptop is connected and will no
longer update room temperature sensor values.
 For Digital Room Units (Series 2200/2300 Firmware Revision 26 and later) – The
revision number displays for 5 seconds when the room unit is first powered up or
when a laptop is disconnected. These room units will continue to display and
update the room temperature sensor values when a laptop is connected.
Room Unit Operation
Sensor Select
SENSOR SEL is a configurable, enumerated point (values are additive). This point tells
the controller what type of room unit is being used and how to handle loss of
communication, for more information see Fail Mode Operation [➙ 37]. It also provides
the ability to enable the optional RH and CO2 sensors and indicates which thermistor
type is connected.