Glossary
25
Siemens Industry, Inc.
Owner's Manual
125-5093
Building Technologies
2015-10-14
HMI
Human Machine Interface. Terminal and its interface program that allows you to
communicate with a field panel or equipment controller.
Occupancy sensor
A control device that detects presence of people in a space by using infrared or
ultrasonic technology. Occupancy sensors are used to save energy by controlling
lighting and temperature and, along with CO2 sensors, to provide control input of
demand control ventilation (DCV) algorithms.
override switch
Button on a room temperature sensor that an occupant can press to change the status
of a room from unoccupied to occupied (or from night to day) for a predetermined time.
pressure dependent
Variable Air Volume (VAV) room temperature control system in which the temperature
drives a damper such that the air volume delivered to the space at any damper position
is dependent on the duct static pressure.
pressure independent
Variable Air Volume (VAV) room temperature control system in which the temperature
drives an airflow setpoint such that the air volume delivered to the space is
independent of variations in the duct static pressure.
PID
Proportional, Integral, Derivative.
RTS
Room Temperature Sensor.
setpoint
Data point that stores a value such as a temperature setting. In contrast, points that
monitor inputs, such as temperature, report actual values.
SI units
Systeme International d'Unites. The international metric system.
slave mode
Default application that displays when power is first applied to an equipment controller.
No control action is initiated in the slave mode. Input and output points in the slave
application can be monitored or controlled by a field panel (or by PPCL in a BACnet
PTEC controller).
stand-alone control
Type of control offered by a controller that is providing independent DDC control to a
space.
Terminal Equipment Controller
Siemens Industry, Inc. product family of equipment controllers that house the
applications software used to control terminal units, such as heat pumps, VAV terminal
boxes, fan coil units, unit ventilators, and so on.
Summary of Contents for BACnet
Page 2: ......
