Siemens BACNET 125-699 - Manual (Page 39)

Glossary
Siemens Building Technologies, Inc. 31
control loop
PID algorithm that is used to control an output based on a setpoint and an input reading from
a sensor.
DDC
Direct Digital Control.
DI
Digital Input. Physical input point that receives a two-state signal (ON/OFF, OPEN/CLOSED,
YES/NO).
DO
Digital Output. Physical output point that sends a two-state signal (ON/OFF, OPEN/CLOSED,
YES/NO).
English units
The foot-pound-second system of units for weights and measurements.
equipment controller
FLN device that provides additional point capacity to a field panel or provides individual room
or mechanical equipment control.
field panel
A device containing a microprocessor for centralized control of system components and
equipment controllers.
FLN
Field Level Network. Network consisting of equipment controllers, FLN end devices, fume
hoods, etc.
HMI
Human Machine Interface. Terminal and its interface program that allows you to
communicate with a field panel or equipment controller.