3. RTU
RTU: Short for remote terminal unit.
In SCADA systems, an RTU is a device installed at a
remote location that collects data, codes the data into
a format that is transmittable and transmits the data
back to a central station, or master.
4. PLC
PLC: A PROGRAMMABLE LOGIC
CONTROLLER (PLC) is an industrial computer
control system that continuously monitors the state of
input devices and makes decisions based upon a
custom program to control the state of output devices.
5. HMI
HMI: HMI stands for Human Machine Interface.
This is the interface between the operator and the
controller. The HMI is the controller operating panel.
6. Telemetry system
Telemetry system: Telemetry is the wireless
transmission and reception of measured quantities for
the purpose of remotely monitoring environmental
conditions or equipment parameters. The term is also
used in reference to the signals containing such data.
7. Data Acquisition
Data Acquisition: Data acquisition (DAQ) is the
process of measuring an electrical or physical
phenomenon such as voltage, current, temperature,
pressure, or sound with a computer. A DAQ system
consists of sensors, DAQ measurement hardware, and
a computer with programmable software.