DCS-ITS A CONTROLLER IT HAS PROCESSORS AND MODULE LIKE ANALOG
I/O,DIGITAL I/O,RTD,T/C,VALVE POSITION MODULE ETC
WE CAN CONTROL AND MONITER THE PROCESS.
SCADA- IT ONLY A USED TO MONITOR THE PROCESS &WE CAN CREATE
THE GRAPHICS OF PROCESS SOMETHING.ITS NOT USED ALONE.IT JUST
CONNECTED WITH PLC ETC.
DCS IT SELF CONTAINS SCADA SOFTWARE
dcs is a system through which u can connect more than one system to control like HMI, PLC, PDI . scada is a supervisory software through which you can make same to same copy (graphics) of your process plant
DCS IS DONE TO AUTOMATE A PLANT. IT IS DONE WITH THE HELP OF
PLC'S AND SCADA.SCADA IS THE SYSTEM THAT PROVIDE THE
MONITORING AND CAN PERFORM ONLY PROCESS OUTPUT CONTROL.HENCE
IT IS A SUPERVISORY CONTROL.