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difference between DCS @ SCADA system?
and how can use in field
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Answer Posted / deepan.p
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
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A PLC is programmed to drive three motors A, B and C as follows : After running motor A for an hour, motor B should get ON and motor A should get OFF. And after running motor B for an hour, motor C should get ON and motor B should get OFF. And after running motor C for an hour, motor A should get ON and motor C should get OFF. (That is, a cyclic repetition with time period one hour) Now, the second condition is: If any motor gone faulty and is tripped, the consecutive motor should get ON and the faulty (tripped) motor should be eliminated from cyclic repetition. The remaining two motors should bear the cyclic repetition of one hour each. (For healthy motor take logic as high and for tripped motor take logic as low) Now, the third condition is: When motor A load(Amps) exceeds 60% of its rated load, motor B should get ON in parallel to motor A. And when both motors A & B are running in parallel, and if their load exceeds 60% of their rated load, motor C should also start in parallel to A & B. [Here the cyclic repetition is eliminated, until their loads become normal(40%)] [Take logic high(1) for load at 60% and logic low(0) for load at 40%] Now draw a flow chart or a ladder diagram to fulfill the above condition.
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