SCADA stands for Supervisory Control And Data Acquisition. Normally, it is used in several fields:
Industrial Monitoring and Control
Manufacturing Process
图1.1 SCADA framework
Main components are:
SCADA Host: This is the centre computer, it collect, process and stores all data. It can be just a program, or can be a program team.
HMI: This is the client end interface. It stands for Human Machine Interface.
Communication Network: This may be Ethernet, serial port or even wireless network
PLC / RTU: This is the communication equipment. RTU stands for Remote Telecommunication Unit. PLC stands for Programmable Logical Controller. Traditionally, PLC fulfill more control function, RTU can undertake more communication work and can work under more serious environment. But today this difference is dimming.
Device: This is the practical equipment which completes the industrial function, such as pump, valve, or switch.
There are data flows in two ways: Control and Data Acquisition.
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