Answer Posted / vaibhava satsangi
PLC - PROGRAMABLE LOGIC CONTROLLER
DCS - DISTRIBUTED CONTROL SYSTEM
PLC - PREFERED FOR SMALLER APPLICATIONS, DIGITAL I/OS,
DIGITAL INTERLOCKS, CAN BE USED IN REDUNDENT APPLICATIONS
IF USED FOR PROCESS CONTROL I/O ADDRESSES AND TABLES LOADED
ON A SEPRATE PC's.
DCS - PREFFERED FOR BIGGER APPLICATIONS, TO CONTROL
DIFFERENT PLANTS LOCATED AT DIFFERENT LOCATION FROM THE
CENTRLISED/LOCAL LOCATION, MAY BE CONTROLLING VARIOUS PLC's
ALSO, PREFFERD FOR PID's GROUPS, THIS A EXPENSIVE &
CRITICAL CONFIGURATION, PREFFERD TO CONTROL CRITICAL
PROCESS. I/O ADDRESSES AND TABLES LOADED WITHIN SYSTEM CAN
BE ASSESSED FROM ANY HMI(HUMAN MACHINE INTERFACE).
| Is This Answer Correct ? | 21 Yes | 3 No |
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use of split range ? where it is used ? in which control loop it is used ?
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Question on maha cement
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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.
where cascade loop use ?
