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What is the difference between HMI,SCADA and MMI,not
abbrevation?
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Answer Posted / parag pathak
First about HMI and MMI:
MMI- Man Machine Interface
HMI- Human Machine Interface
Initailly MMI layer was name given to computers of Control
room to intrface (to view, to modify, to log data) with DCS
system. Later on even ladies started working in process and
control room so they change to Human Machine Interface. HMI
layer consists of many operator consoles and an engineering
console
About SCADA:
SCADA is Supervisory Control amd Data Aquization.. This is
a vendor made program usually for PLC. Initially PLC was
made for dedicated package (AI, DI and DO ) but later on it
was started using for Contols, so it was required to
modify, log the data in the computer so each vendor develop
software compatible with PLC hardware which gives facility
for operator to watch, control and save history of the
process parameters
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